后台管理的第一个页面以及实现一个下拉列表自定义控件

1. /// <summary>
2. /// if Type is 99,will show all departments,
3. /// type must be given value;
4. /// </summary>
5. public partial class DepartmentDropDownList : System.Web.UI.UserControl
6. {
7.     private string _value;
8.  
9.     #region skin or style
10.     public string Css
11.     {
12.         set
13.         {
14.             ddlDepartment.CssClass = value;
15.         }
16.     }
17.     public Unit Width
18.     {
19.         set
20.         {
21.             ddlDepartment.Width = value;
22.         }
23.     }
24.     #endregion
25.  
26.  
27.     /// <summary>
28.     /// if Type<0,will show all departments
29.     /// </summary>
30.     public string Type { get; set; }
31.  
32.  
33.     public string Value
34.     {
35.         get
36.         {
37.             return ddlDepartment.SelectedValue;
38.         }
39.         set
40.         {
41.             this._value = value;
42.             BindData();
43.             for (int i = 0; i < ddlDepartment.Items.Count; i++)
44.             {
45.                 if (ddlDepartment.Items[i].Value == this._value)
46.                 {
47.                     ddlDepartment.Items[i].Selected = true;
48.                 }
49.             }
50.         }
51.  
52.     }
53.  
54.     /// <summary>
55.     /// if you give a ListItem which has the same value of ListItem.Value,
56.     /// the item of ddlDeparments will be selected,
57.     /// the Text property of ListItem is not required
58.     /// </summary>
59.     public ListItem SelectedItem
60.     {
61.         get
62.         {
63.             return ddlDepartment.SelectedItem;
64.         }
65.         set
66.         {
67.  
68.             for (int i = 0; i < ddlDepartment.Items.Count; i++)
69.             {
70.                 if (ddlDepartment.Items[i].Value == value.Value)
71.                 {
72.                     ddlDepartment.Items[i].Selected = true;
73.                 }
74.             }
75.         }
76.     }
77.  
78.     //public DepartmentDropDownList()
79.     //{
80.     // BindData(99);
81.     //}
82.  
83.     protected void Page_Load(object sender, EventArgs e)
84.     {
85.         //if this control used in Ajax page,will not changed the item selected
86.         //so should
87.  
88.            // BindData();
89.         for (int i = 0; i < ddlDepartment.Items.Count; i++)
90.         {
91.             if (ddlDepartment.Items[i].Value == this.Value)
92.             {
93.                 ddlDepartment.Items[i].Selected = true;
94.             }
95.         }
96.  
97.  
98.  
99.     }
100.  
101.  
102.  
103.     /// <summary>
104.     /// type is department type .if type==99, get all
105.     /// </summary>
106.     /// <param name="type"></param>
107.     public void BindData(int type)
108.     {
109.  
110.         List<Department> table = new List<Department>();
111.         //check the department type.
112.         if (type==99)
113.         {
114.             table = DepartmentManager.GetAll();
115.         }
116.         else
117.         {
118.             table=DepartmentManager.GetAll().Where(p => p.DepartmentType == type).ToList();
119.         }
120.         string flag = "|--";
121.         //clear prevent the item duplicate
122.         ddlDepartment.Items.Clear();
123.         ListItem itemTop = new ListItem("一级部门", "0");
124.         ddlDepartment.Items.Add(itemTop);
125.         foreach (var q in table.Where(p=>p.UpDepartmentId==0))
126.         {
127.             ListItem item = new ListItem(q.DepartmentName, q.DepartmentId.ToString());
128.             ddlDepartment.Items.Add(item);
129.             AddSubItem(item, table, flag);
130.             //var subTable = table.Where(p => p.UpDepartmentId == q.DepartmentId).ToList();
131.         }
132.  
133.     }
134.  
135.     public void BindData()
136.     {
137.         BindData(int.Parse(this.Type));
138.     }
139.  
140.  
141.     //add sub department item to DropDownList
142.     private void AddSubItem(ListItem item, List<Department> table, string flag)
143.     {
144.         int upId =int.Parse( item.Value.ToString());
145.         var subTable = table.Where(p => p.UpDepartmentId == upId).ToList();
146.         foreach (var q in subTable)
147.         {
148.             ListItem subItem = new ListItem(flag+q.DepartmentName, q.DepartmentId.ToString());
149.             ddlDepartment.Items.Add(subItem);
150.  
151.             AddSubItem(subItem, table, flag+flag);
152.         }
153.     }
154.  
155. }

要求先要指定 Type,否则要发生异常。如果想要制作其他类似的话，只要修改数据源就可以了。