C#.NET实现带“TreeView”控件的MDIForm左右分栏效果

  有两种方法，一种是用“Pannel”控件来控制右栏子窗体位置和大小，另一种是用“Splitter” （分隔条）控件来控制右栏子窗体位置和大小。

• 方法一：

主要用到“TreeView”控件、“Pannel”控件、“MainMenu”控件、“StatusBar”控件、“ImageList” 控件，新建Form1（主窗体）、Form2两个窗体，将Form1窗体的“IsMdiContainer”设为True，运行效果如下：

1.         右边子窗体有标题栏：

2.         右边子窗体无标题栏（设置temp_form.FormBorderStyle=FormBorderStyle.None;）：

 

 

附：（Form1.cs代码）

using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

using System.Data;

 

namespace MDIForm

{

     /// <summary>

     /// Form1 的摘要说明。

     /// </summary>

     public class Form1 : System.Windows.Forms.Form

     {

         private System.Windows.Forms.MainMenu mainMenu1;

         private System.Windows.Forms.MenuItem menuItem1;

         private System.Windows.Forms.MenuItem menuItem2;

         private System.Windows.Forms.MenuItem menuItem4;

         private System.Windows.Forms.MenuItem menuItem5;

         private System.Windows.Forms.TreeView treeView1;

         private System.Windows.Forms.Panel panel1;

         private System.Windows.Forms.StatusBar statusBar1;

         private System.Windows.Forms.ImageList imageList1;

         private System.ComponentModel.IContainer components;

 

         public Form1()

         {

              //

              // Windows 窗体设计器支持所必需的

              //

              InitializeComponent();

 

              //

              // TODO: 在 InitializeComponent 调用后添加任何构造函数代码

              //

         }

 

         /// <summary>

         /// 清理所有正在使用的资源。

         /// </summary>

         protected override void Dispose( bool disposing )

         {

              if( disposing )

              {

                   if (components != null)

                   {

                       components.Dispose();

                   }

              }

              base.Dispose( disposing );

         }

 

         #region Windows 窗体设计器生成的代码

         /// <summary>

         /// 设计器支持所需的方法 - 不要使用代码编辑器修改

         /// 此方法的内容。

         /// </summary>

         private void InitializeComponent()

         {

              this.components = new System.ComponentModel.Container();

              System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));

              this.mainMenu1 = new System.Windows.Forms.MainMenu();

              this.menuItem1 = new System.Windows.Forms.MenuItem();

              this.menuItem2 = new System.Windows.Forms.MenuItem();

              this.menuItem4 = new System.Windows.Forms.MenuItem();

              this.menuItem5 = new System.Windows.Forms.MenuItem();

              this.treeView1 = new System.Windows.Forms.TreeView();

              this.panel1 = new System.Windows.Forms.Panel();

              this.statusBar1 = new System.Windows.Forms.StatusBar();

              this.imageList1 = new System.Windows.Forms.ImageList(this.components);

              this.SuspendLayout();

              //

              // mainMenu1

              //

              this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {

                                                                                                   this.menuItem1,

                                                                                                   this.menuItem4,

                                                                                                   this.menuItem5});

              //

              // menuItem1

              //

              this.menuItem1.Index = 0;

              this.menuItem1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {

                                                                                                   this.menuItem2});

              this.menuItem1.Text = "文件(&F)";

              //

              // menuItem2

              //

              this.menuItem2.Index = 0;

              this.menuItem2.Text = "退出(&X)";

              this.menuItem2.Click += new System.EventHandler(this.menuItem2_Click);

              //

              // menuItem4

              //

              this.menuItem4.Index = 1;

              this.menuItem4.Text = "选项(&O)";

              //

              // menuItem5

              //

              this.menuItem5.Index = 2;

              this.menuItem5.Text = "帮助(&H)";

              //

              // treeView1

              //

              this.treeView1.BorderStyle = System.Windows.Forms.BorderStyle.None;

              this.treeView1.Font = new System.Drawing.Font("宋体", 10F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));

              this.treeView1.ImageList = this.imageList1;

              this.treeView1.ItemHeight = 14;

              this.treeView1.Location = new System.Drawing.Point(0, 0);

              this.treeView1.Name = "treeView1";

              this.treeView1.Nodes.AddRange(new System.Windows.Forms.TreeNode[] {

                                                                                              new System.Windows.Forms.TreeNode("业务类别", new System.Windows.Forms.TreeNode[] {

                                                                                                                                                                                               new System.Windows.Forms.TreeNode("销售"),

                                                                                                                                                                                               new System.Windows.Forms.TreeNode("生产管理")}),

                                                                                              new System.Windows.Forms.TreeNode("其他", new System.Windows.Forms.TreeNode[] {

                                                                                                                                                                                           new System.Windows.Forms.TreeNode("基本数据录入")}),

                                                                                              new System.Windows.Forms.TreeNode("信息", new System.Windows.Forms.TreeNode[] {

                                                                                                                                                                                            new System.Windows.Forms.TreeNode("信息一览")})});

              this.treeView1.ShowLines = false;

              this.treeView1.Size = new System.Drawing.Size(184, 680);

              this.treeView1.TabIndex = 0;

              this.treeView1.AfterSelect += new System.Windows.Forms.TreeViewEventHandler(this.treeView1_AfterSelect);

              //

              // panel1

              //

              this.panel1.Location = new System.Drawing.Point(184, 0);

              this.panel1.Name = "panel1";

              this.panel1.Size = new System.Drawing.Size(840, 680);

              this.panel1.TabIndex = 3;

              //

              // statusBar1

              //

              this.statusBar1.Location = new System.Drawing.Point(0, 681);

              this.statusBar1.Name = "statusBar1";

              this.statusBar1.Size = new System.Drawing.Size(1016, 32);

              this.statusBar1.TabIndex = 5;

              this.statusBar1.Text = "当前打开窗体：";

              //

              // imageList1

              //

              this.imageList1.ImageSize = new System.Drawing.Size(16, 16);

              this.imageList1.ImageStream = ((System.Windows.Forms.ImageListStreamer)(resources.GetObject("imageList1.ImageStream")));

              this.imageList1.TransparentColor = System.Drawing.Color.Transparent;

              //

              // Form1

              //

              this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);

              this.ClientSize = new System.Drawing.Size(1016, 713);

              this.Controls.Add(this.statusBar1);

              this.Controls.Add(this.panel1);

              this.Controls.Add(this.treeView1);

              this.IsMdiContainer = true;

              this.Menu = this.mainMenu1;

              this.Name = "Form1";

              this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;

              this.Text = "MDIForm";

              this.WindowState = System.Windows.Forms.FormWindowState.Maximized;

              this.ResumeLayout(false);

 

         }

         #endregion

 

         /// <summary>

         /// 应用程序的主入口点。

         /// </summary>

         [STAThread]

         static void Main()

         {

              Application.Run(new Form1());

         }

 

         private void treeView1_AfterSelect(object sender, System.Windows.Forms.TreeViewEventArgs e)

         {

              System.String str = treeView1.SelectedNode.Text;//取得相应treeview结点的text值

              bool remark=true;

 

              for(int i=0; i<this.MdiChildren.Length;i++)

                   if(this.MdiChildren[i].Name.Equals( str )) //查看有没有相同的MDI子窗体

                   {

                       this.MdiChildren[i].Activate(); //子窗体已经被创立，激活它

                       remark=false;

                       break;

                   }

 

              if(remark) // 末创立，建立子窗体

              {

                   panel1.Controls.Clear();

                   Form2 temp_form = new Form2();

                   temp_form.TopLevel=false;

                   temp_form.Parent=panel1;

                   temp_form.Dock=DockStyle.Fill;

                   temp_form.Name=str;

                   temp_form.Text=str;

                   //设置子窗体无标题栏

                   //temp_form.FormBorderStyle=FormBorderStyle.None;

                   temp_form.WindowState=FormWindowState.Maximized;

                   temp_form.Show();

              }

              statusBar1.Text="当前打开窗体："+e.Node.Text;

         }

 

         private void menuItem2_Click(object sender, System.EventArgs e)

         {

              this.Close();

         }

     }

}

 

 

 

• 方法二：

主要用到“TreeView”控件、“Splitter”控件、“MainMenu”控件、“StatusBar”控件、“ImageList”控件、“ToolBar”控件，新建Form1（主窗体）、Form2、Form3 、Form4四个窗体，将Form1窗体的“IsMdiContainer”设为True，运行效果如下：

1.         子窗体非最大化显示：

2.         子窗体最大化显示：

 

附：（Form1.cs代码）

using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

using System.Threading;

 

namespace MDIForm

{

     /// <summary>

     /// Form1 的摘要说明。

     /// </summary>

     public class FrmMain : System.Windows.Forms.Form

     {

         private System.Windows.Forms.MainMenu mainMenu1;

         private System.Windows.Forms.MenuItem menuItem1;

         private System.Windows.Forms.MenuItem menuItem2;

         private System.Windows.Forms.MenuItem menuItem3;

         private System.Windows.Forms.MenuItem menuItem4;

         private System.Windows.Forms.MenuItem menuItem5;

         private System.Windows.Forms.StatusBar statusBar1;

         private System.Windows.Forms.MenuItem menuItem6;

         private System.Windows.Forms.MenuItem menuItem7;

         private System.Windows.Forms.MenuItem menuItem9;

         private System.Windows.Forms.MenuItem menuItem10;

         private System.Windows.Forms.MenuItem menuItem11;

         private System.Windows.Forms.MenuItem menuItem12;

         private System.Windows.Forms.MenuItem menuItem13;

         private System.Windows.Forms.MenuItem menuItem14;

         private System.Windows.Forms.MenuItem menuItem15;

         private System.Windows.Forms.ImageList imageList1;

         private System.Windows.Forms.ToolBar toolBar1;

         private System.Windows.Forms.ToolBarButton toolBarButton1;

         private System.Windows.Forms.ToolBarButton toolBarButton2;

         private System.Windows.Forms.ToolBarButton toolBarButton3;

         private System.Windows.Forms.ToolBarButton toolBarButton4;

         private System.Windows.Forms.ToolBarButton toolBarButton5;

         private System.Windows.Forms.ContextMenu contextMenu1;

         private System.Windows.Forms.MenuItem menuItem8;

         private System.Windows.Forms.MenuItem menuItem16;

         private System.Windows.Forms.MenuItem menuItem17;

         private System.Windows.Forms.MenuItem menuItem18;

         private System.Windows.Forms.MenuItem menuItem19;

         private System.Windows.Forms.MenuItem menuItem20;

         private System.Windows.Forms.MenuItem menuItem21;

         private System.Windows.Forms.MenuItem menuItem22;

         private System.Windows.Forms.MenuItem menuItem23;

         private System.Windows.Forms.TreeView treeView1;

         private System.Windows.Forms.Splitter splitter1;

         private System.ComponentModel.IContainer components;

         //private Form3 _form3=new Form3();

 

         public FrmMain()

         {

              //

              // Windows 窗体设计器支持所必需的

              //

              InitializeComponent();

 

              //

              // TODO: 在 InitializeComponent 调用后添加任何构造函数代码

              //

         }

 

         /// <summary>

         /// 清理所有正在使用的资源。

         /// </summary>

         protected override void Dispose( bool disposing )

         {

              if( disposing )

              {

                   if(components != null)

                   {

                       components.Dispose();

                   }

              }

              base.Dispose( disposing );

         }

 

         #region Windows 窗体设计器生成的代码

         /// <summary>

         /// 设计器支持所需的方法 - 不要使用代码编辑器修改

         /// 此方法的内容。

         /// </summary>

         private void InitializeComponent()

         {

              this.components = new System.ComponentModel.Container();

              System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(FrmMain));

              this.mainMenu1 = new System.Windows.Forms.MainMenu();

              this.menuItem1 = new System.Windows.Forms.MenuItem();

              this.menuItem20 = new System.Windows.Forms.MenuItem();

              this.menuItem22 = new System.Windows.Forms.MenuItem();

              this.menuItem15 = new System.Windows.Forms.MenuItem();

              this.menuItem11 = new System.Windows.Forms.MenuItem();

              this.menuItem12 = new System.Windows.Forms.MenuItem();

              this.menuItem21 = new System.Windows.Forms.MenuItem();

              this.menuItem13 = new System.Windows.Forms.MenuItem();

              this.menuItem14 = new System.Windows.Forms.MenuItem();

              this.menuItem7 = new System.Windows.Forms.MenuItem();

              this.menuItem6 = new System.Windows.Forms.MenuItem();

              this.menuItem2 = new System.Windows.Forms.MenuItem();

              this.menuItem3 = new System.Windows.Forms.MenuItem();

              this.menuItem4 = new System.Windows.Forms.MenuItem();

              this.menuItem9 = new System.Windows.Forms.MenuItem();

              this.menuItem10 = new System.Windows.Forms.MenuItem();

              this.menuItem5 = new System.Windows.Forms.MenuItem();

              this.menuItem23 = new System.Windows.Forms.MenuItem();

              this.statusBar1 = new System.Windows.Forms.StatusBar();

              this.imageList1 = new System.Windows.Forms.ImageList(this.components);

              this.toolBar1 = new System.Windows.Forms.ToolBar();

              this.toolBarButton1 = new System.Windows.Forms.ToolBarButton();

              this.toolBarButton2 = new System.Windows.Forms.ToolBarButton();

              this.contextMenu1 = new System.Windows.Forms.ContextMenu();

              this.menuItem8 = new System.Windows.Forms.MenuItem();

              this.menuItem16 = new System.Windows.Forms.MenuItem();

              this.menuItem17 = new System.Windows.Forms.MenuItem();

              this.menuItem18 = new System.Windows.Forms.MenuItem();

              this.menuItem19 = new System.Windows.Forms.MenuItem();

              this.toolBarButton3 = new System.Windows.Forms.ToolBarButton();

              this.toolBarButton4 = new System.Windows.Forms.ToolBarButton();

              this.toolBarButton5 = new System.Windows.Forms.ToolBarButton();

              this.treeView1 = new System.Windows.Forms.TreeView();

              this.splitter1 = new System.Windows.Forms.Splitter();

              this.SuspendLayout();

              //

              // mainMenu1

              //

              this.mainMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {

                                                                                                   this.menuItem1,

                                                                                                   this.menuItem2,

                                                                                                   this.menuItem3,

                                                                                                   this.menuItem4,

                                                                                                   this.menuItem5});

              //

              // menuItem1

              //

              this.menuItem1.Index = 0;

              this.menuItem1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {

                                                                                                   this.menuItem20,

                                                                                                   this.menuItem22,

                                                                                                   this.menuItem15,

                                                                                                   this.menuItem11,

                                                                                                   this.menuItem12,

                                                                                                   this.menuItem21,

                                                                                                   this.menuItem13,

                                                                                                   this.menuItem14,

                                                                                                   this.menuItem7,

                                                                                                   this.menuItem6});

              this.menuItem1.Text = "文件(&F)";

              //

              // menuItem20

              //

              this.menuItem20.Index = 0;

              this.menuItem20.Text = "登录系统(&L)";

              this.menuItem20.Click += new System.EventHandler(this.menuItem20_Click);

              //

              // menuItem22

              //

              this.menuItem22.Index = 1;

              this.menuItem22.Text = "-";

              //

              // menuItem15

              //

              this.menuItem15.Index = 2;

              this.menuItem15.Text = "新建业务(&N)";

              this.menuItem15.Click += new System.EventHandler(this.menuItem15_Click);

              //

              // menuItem11

              //

              this.menuItem11.Index = 3;

              this.menuItem11.Text = "打开业务(&O)";

              //

              // menuItem12

              //

              this.menuItem12.Index = 4;

              this.menuItem12.Text = "保存业务(&S)";

              //

              // menuItem21

              //

              this.menuItem21.Index = 5;

              this.menuItem21.Text = "-";

              //

              // menuItem13

              //

              this.menuItem13.Index = 6;

              this.menuItem13.Text = "关闭当前(&C)";

              this.menuItem13.Click += new System.EventHandler(this.menuItem13_Click);

              //

              // menuItem14

              //

              this.menuItem14.Index = 7;

              this.menuItem14.Text = "关闭所有(&A)";

              this.menuItem14.Click += new System.EventHandler(this.menuItem14_Click);

              //

              // menuItem7

              //

              this.menuItem7.Index = 8;

              this.menuItem7.Text = "-";

              //

              // menuItem6

              //

              this.menuItem6.Index = 9;

              this.menuItem6.Text = "退出系统(&E)";

              this.menuItem6.Click += new System.EventHandler(this.menuItem6_Click);

              //

              // menuItem2

              //

              this.menuItem2.Index = 1;

              this.menuItem2.Text = "编辑(&E)";

              //

              // menuItem3

              //

              this.menuItem3.Index = 2;

              this.menuItem3.Text = "工具(&T)";

              //

              // menuItem4

              //

              this.menuItem4.Index = 3;

              this.menuItem4.MdiList = true;

              this.menuItem4.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {

                                                                                                   this.menuItem9,

                                                                                                   this.menuItem10});

              this.menuItem4.Text = "窗口(&W)";

              //

              // menuItem9

              //

              this.menuItem9.Index = 0;

              this.menuItem9.Text = "平铺";

              this.menuItem9.Click += new System.EventHandler(this.menuItem9_Click);

              //

              // menuItem10

              //

              this.menuItem10.Index = 1;

              this.menuItem10.Text = "层叠";

              this.menuItem10.Click += new System.EventHandler(this.menuItem10_Click);

              //

              // menuItem5

              //

              this.menuItem5.Index = 4;

              this.menuItem5.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {

                                                                                                   this.menuItem23});

              this.menuItem5.Text = "帮助(&H)";

              //

              // menuItem23

              //

              this.menuItem23.Index = 0;

              this.menuItem23.Text = "关于(&A)";

              //

              // statusBar1

              //

              this.statusBar1.Location = new System.Drawing.Point(0, 371);

              this.statusBar1.Name = "statusBar1";

              this.statusBar1.Size = new System.Drawing.Size(632, 22);

              this.statusBar1.TabIndex = 1;

              //

              // imageList1

              //

              this.imageList1.ImageSize = new System.Drawing.Size(16, 16);

              this.imageList1.ImageStream = ((System.Windows.Forms.ImageListStreamer)(resources.GetObject("imageList1.ImageStream")));

              this.imageList1.TransparentColor = System.Drawing.Color.Transparent;

              //

              // toolBar1

              //

              this.toolBar1.Appearance = System.Windows.Forms.ToolBarAppearance.Flat;

              this.toolBar1.Buttons.AddRange(new System.Windows.Forms.ToolBarButton[] {

                                                                                                       this.toolBarButton1,

                                                                                                       this.toolBarButton2,

                                                                                                       this.toolBarButton3,

                                                                                                       this.toolBarButton4,

                                                                                                       this.toolBarButton5});

              this.toolBar1.ButtonSize = new System.Drawing.Size(16, 16);

              this.toolBar1.ContextMenu = this.contextMenu1;

              this.toolBar1.DropDownArrows = true;

              this.toolBar1.ImageList = this.imageList1;

              this.toolBar1.Location = new System.Drawing.Point(0, 0);

              this.toolBar1.Name = "toolBar1";

              this.toolBar1.ShowToolTips = true;

              this.toolBar1.Size = new System.Drawing.Size(632, 28);

              this.toolBar1.TabIndex = 3;

              this.toolBar1.ButtonClick += new System.Windows.Forms.ToolBarButtonClickEventHandler(this.toolBar1_ButtonClick);

              //

              // toolBarButton1

              //

              this.toolBarButton1.ImageIndex = 0;

              //

              // toolBarButton2

              //

              this.toolBarButton2.DropDownMenu = this.contextMenu1;

              this.toolBarButton2.ImageIndex = 1;

              this.toolBarButton2.Style = System.Windows.Forms.ToolBarButtonStyle.DropDownButton;

              //

              // contextMenu1

              //

              this.contextMenu1.MenuItems.AddRange(new System.Windows.Forms.MenuItem[] {

                                                                                                        this.menuItem8,

                                                                                                        this.menuItem16,

                                                                                                        this.menuItem17,

                                                                                                        this.menuItem18,

                                                                                                        this.menuItem19});

              //

              // menuItem8

              //

              this.menuItem8.Index = 0;

              this.menuItem8.Text = "工资管理";

              //

              // menuItem16

              //

              this.menuItem16.Index = 1;

              this.menuItem16.Text = "考勤管理";

              //

              // menuItem17

              //

              this.menuItem17.Index = 2;

              this.menuItem17.Text = "申请假期";

              //

              // menuItem18

              //

              this.menuItem18.Index = 3;

              this.menuItem18.Text = "销售开票";

              //

              // menuItem19

              //

              this.menuItem19.Index = 4;

              this.menuItem19.Text = "库存查询";

              //

              // toolBarButton3

              //

              this.toolBarButton3.ImageIndex = 2;

              //

              // toolBarButton4

              //

              this.toolBarButton4.Style = System.Windows.Forms.ToolBarButtonStyle.Separator;

              //

              // treeView1

              //

              this.treeView1.Dock = System.Windows.Forms.DockStyle.Left;

              this.treeView1.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));

              this.treeView1.ImageIndex = 1;

              this.treeView1.ImageList = this.imageList1;

              this.treeView1.Location = new System.Drawing.Point(0, 28);

              this.treeView1.Name = "treeView1";

              this.treeView1.Nodes.AddRange(new System.Windows.Forms.TreeNode[] {

                                                                                              new System.Windows.Forms.TreeNode("业务类别", new System.Windows.Forms.TreeNode[] {

                                                                                                                                                                                               new System.Windows.Forms.TreeNode("销售"),

                                                                                                                                                                                               new System.Windows.Forms.TreeNode("生产管理")}),

                                                                                              new System.Windows.Forms.TreeNode("其他", new System.Windows.Forms.TreeNode[] {

                                                                                                                                                                                           new System.Windows.Forms.TreeNode("基本数据录入")}),

                                                                                              new System.Windows.Forms.TreeNode("信息", new System.Windows.Forms.TreeNode[] {

                                                                                                                                                                                           new System.Windows.Forms.TreeNode("信息一览")})});

              this.treeView1.Size = new System.Drawing.Size(176, 343);

              this.treeView1.TabIndex = 5;

              this.treeView1.AfterSelect += new System.Windows.Forms.TreeViewEventHandler(this.treeView1_AfterSelect);

              //

              // splitter1

              //

              this.splitter1.Location = new System.Drawing.Point(176, 28);

              this.splitter1.Name = "splitter1";

              this.splitter1.Size = new System.Drawing.Size(16, 343);

              this.splitter1.TabIndex = 6;

              this.splitter1.TabStop = false;

              //

              // FrmMain

              //

              this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);

              this.ClientSize = new System.Drawing.Size(632, 393);

              this.Controls.Add(this.splitter1);

              this.Controls.Add(this.treeView1);

              this.Controls.Add(this.toolBar1);

              this.Controls.Add(this.statusBar1);

              this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));

              this.IsMdiContainer = true;

              this.Menu = this.mainMenu1;

              this.Name = "FrmMain";

              this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;

              this.Text = " MDIForm";

              this.WindowState = System.Windows.Forms.FormWindowState.Maximized;

              this.Load += new System.EventHandler(this.FrmMain_Load);

              this.ResumeLayout(false);

 

         }

         #endregion

 

         /// <summary>

         /// 应用程序的主入口点。

         /// </summary>

         [STAThread]

         static void Main()

         {

              bool createdNew;

              Mutex m=new Mutex(true,"test",out createdNew);

              if (createdNew)

              {

                   Application.Run(new FrmMain());

                   m.ReleaseMutex();

              }

              else

              {

                   MessageBox.Show("系统只允许运行一个实例！","系统提示");

              }

         }

 

         private void menuItem6_Click(object sender, System.EventArgs e)

         {

              this.Close();

         }

 

         private void menuItem9_Click(object sender, System.EventArgs e)

         {

              this.LayoutMdi(System.Windows.Forms.MdiLayout.TileHorizontal);

         }

 

         private void menuItem15_Click(object sender, System.EventArgs e)

         {

              Form3 child1 = new Form3();

              child1.MdiParent = this;                 

              child1.Show();

         }

 

         private void menuItem10_Click(object sender, System.EventArgs e)

         {

              this.LayoutMdi(System.Windows.Forms.MdiLayout.Cascade);

         }

 

         private void FrmMain_Load(object sender, System.EventArgs e)

         {

              menuItem2.Enabled= true;

              menuItem3.Enabled=true;

              menuItem4.Enabled=true;

              toolBar1.Enabled = true;            

         }

 

         private void menuItem13_Click(object sender, System.EventArgs e)

         {

              if (this.MdiChildren.Length>0)//如果当前有子窗口打开

              {

                   this.ActiveMdiChild.Close();

              }

         }

 

         private void menuItem14_Click(object sender, System.EventArgs e)

         {

              Form[] children = this.MdiChildren; // 获取当前打开的子窗体

              for( int i=0;i<children.Length;i++)

              children[i].Close();

         }

 

         private void menuItem20_Click(object sender, System.EventArgs e)

         {

              Form2 frm = new Form2();//创建一个登录窗口

              frm.MdiParent=this;

              frm.Show();//显示这个登录窗口

        

              menuItem20.Enabled = false;

         }

 

         private void toolBar1_ButtonClick(object sender, System.Windows.Forms.ToolBarButtonClickEventArgs e)

         {

              if (e.Button==this.toolBarButton1)

              {

                   Form3 child1 = new Form3();

                   child1.MdiParent = this;

                   child1.Show();

              }

         }

 

         private void treeView1_AfterSelect(object sender, System.Windows.Forms.TreeViewEventArgs e)

         {

              System.String str = treeView1.SelectedNode.Text;//取得相应treeview结点的text值

 

              bool remark=true;

 

              for(int i=0; i<this.MdiChildren.Length;i++)

                   if(this.MdiChildren[i].Name.Equals( str )) //查看有没有相同的MDI子窗体

                   {

                       this.MdiChildren[i].Activate(); //子窗体已经被创立，激活它

                       remark=false;

                       break;

                   }   

 

              if(remark) // 末创立，建立子窗体

              {

 

                   Form4 temp_form = new Form4();

                   temp_form.MdiParent=this;

                   temp_form.Name=str;

                   temp_form.Text=str;

                   temp_form.Show();

              }

              statusBar1.Text="当前打开窗体："+treeView1.SelectedNode.Text;

         }

     }

}