一个用于读写配置文件的类 - DotNet编程

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一个用于读写配置文件的类

该类适应读写如下格式的.xml,.config文档

<?xml version="1.0" encoding="utf-8" standalone="no"?>

</appSettings>

</configuration>

using System;

using System.Configuration ;

using System.Reflection ;

using System.Xml;

using System.IO;

using System.Collections.Specialized;

using System.Collections;

using System.Data ;

using System.Diagnostics;

using System.Windows.Forms;

namespace 读写配置文件

{

/// <summary>

/// MrfuRWXmlFile 的摘要说明。

/// </summary>

public class MrfuRWXmlFile

{

public static string ConfigFullName="";

private NameValueCollection appSettings = null;

public MrfuRWXmlFile()

{

// TODO: 在此处添加构造函数逻辑

// Assembly MyAssembly= Assembly.GetExecutingAssembly();

// string ConfigLocPath=MyAssembly.Location;

// string strDireName=Path.GetDirectoryName(ConfigLocPath) ;

// //MessageBox.Show(ConfigLocPath+"\n"+strDireName) ;

// ConfigFullName=ConfigLocPath+".config";

ConfigFullName=Application.StartupPath+@"\myProject.config" ;

//MessageBox.Show(ConfigFullName) ;

}

private static void CreateNewXmlFile()

{

XmlTextWriter myXmlTextWriter = new XmlTextWriter (ConfigFullName, System.Text.Encoding.UTF8 );

myXmlTextWriter.Formatting = Formatting.Indented;

myXmlTextWriter.WriteStartDocument(false); //设置standalone="no" //当为（true）时 <?xml version="1.0" standalone="yes" ?>

// myXmlTextWriter.WriteDocType("bookstore", null, "books.dtd", null);

myXmlTextWriter.WriteComment("This is a config file ,writer by furenjun");

myXmlTextWriter.WriteStartElement("configuration");

myXmlTextWriter.WriteStartElement("appSettings", null);

'写入其它元素'

myXmlTextWriter.WriteEndElement();

//Write the XML to file and close the myXmlTextWriter

myXmlTextWriter.Flush();

myXmlTextWriter.Close();

}

public MrfuRWXmlFile(string ConfigFilePath)

{

// TODO: 在此处添加构造函数逻辑

ConfigFullName=ConfigFilePath;

}

public string GsConfigFilePath

{

get{return ConfigFullName;}

set{ConfigFullName=value;}

}

//初始化xml文档

//首先请右击"项目"-->添加一个新项-->选择"应用程序配置文件"-->点击确定

public static bool CreateXmlFile()

{

if(!File.Exists(ConfigFullName) )

CreateNewXmlFile();

bool bflag=true;

ConfigXmlDocument configXmlDoc=new ConfigXmlDocument();// XmlDocument();

configXmlDoc.Load(ConfigFullName) ;

//检查结点是否存在

XmlNode appSettingsNode;

appSettingsNode = configXmlDoc.SelectSingleNode("configuration/appSettings");

if(appSettingsNode.LocalName=="appSettings") //或者(appSettingNode!=null)

{

//如果xml文档中已存在该结点则采用选择定位该结点的方法

appSettingsNode.RemoveAll();

//MessageBox.Show(appSettingsNode.LocalName) ;

}

else

{

// Create a new element node.

XmlNode newElem;

newElem = configXmlDoc.CreateNode(XmlNodeType.Element, "appSettings", "");

//newElem.InnerText = "290";

//"Add the new element to the document

XmlElement root = configXmlDoc.DocumentElement;

root.AppendChild(newElem);

//("Display the modified XML document

");

//Console.WriteLine(configXmlDoc.OuterXml);

appSettingsNode =newElem;

}

try

{

for (int i = 0; i < 2; i++)

{

string key = "SqlStr"+i.ToString() ;

string val = i.ToString() ;

//创建结点

XmlNode node = configXmlDoc.CreateNode(XmlNodeType.Element, "add", "");

//创建属性"key"并为其赋值

XmlAttribute attr = configXmlDoc.CreateAttribute("key");

attr.Value = key;

node.Attributes.Append(attr);

//创建属性"value"并为其赋值

attr = configXmlDoc.CreateAttribute("value");

attr.Value = val;

node.Attributes.Append(attr);

appSettingsNode.AppendChild(node);

}

configXmlDoc.Save(ConfigFullName);

//MessageBox.Show("创建Xml文档结点成功.","系统提示",MessageBoxButtons.OK ,MessageBoxIcon.Information ) ;

}

catch (Exception ex)

{

bflag=false;

throw new ConfigurationException(ex.ToString() );

}

return bflag;

}

private void LoadFromFile()

{

//if (appSettings == null)

//{

try

{

//string filePath=@"E:\淄博市鲁中机动车检测中心数据联网软件\FromHlk\读写配置文件\ConfigurationSettingsRW_demo\ConfigurationSettingsRW_demo\ConfigurationSettingsRW.exe.config";

ConfigXmlDocument configXml = new ConfigXmlDocument();// XmlDocument();

//configXml.Load(filePath);//this.configFilePath);

configXml.Load(ConfigFullName);

//MessageBox.Show(ConfigFullName ) ;

XmlNode appSettingsNode = configXml.SelectSingleNode("configuration/appSettings");

//MessageBox.Show(appSettingsNode.LocalName) ;

if(appSettingsNode.LocalName=="appSettings")

{

NameValueSectionHandler handler = new NameValueSectionHandler();

appSettings = new NameValueCollection((NameValueCollection)handler.Create(null, null, appSettingsNode));

}

catch (Exception ex)

{

throw new ConfigurationException("Error while loading appSettings. Message: " + ex.Message, ex);

}

//}

}

/// <summary>

/// 获取配置文件中的结点"appSettings"中的值

/// </summary>

/// <returns></returns>

public DataTable GetSettingsValue()

{

LoadFromFile();

DataTable tblAppSettings=new DataTable("Settings") ;

tblAppSettings.Columns.Add("key", typeof(System.String));

tblAppSettings.Columns.Add("value", typeof(System.String));

for (int i = 0; i < appSettings.Count; i++)

{

string key = appSettings.GetKey(i);

string val = appSettings.Get(i);

DataRow row = tblAppSettings.NewRow();

row["key"] = key;

row["value"] = val;

tblAppSettings.Rows.Add(row);

}

return tblAppSettings;

}

/// <summary>

/// 添加一条新的纪录

/// </summary>

/// <param name="strKey"></param>

/// <param name="strValue"></param>

/// <returns></returns>

public bool AddNewRecorder(string strKey,string strValue)

{

bool bflag=true;

XmlDocument configXmlDoc=new XmlDocument();

configXmlDoc.Load(ConfigFullName) ;

XmlNode appSettingsNode;

appSettingsNode = configXmlDoc.SelectSingleNode("configuration/appSettings");

if(appSettingsNode==null)

{

// Create a new element node.

XmlNode newElem;

newElem = configXmlDoc.CreateNode(XmlNodeType.Element, "appSettings", "");

//newElem.InnerText = "290";

//"Add the new element to the document

XmlElement root = configXmlDoc.DocumentElement;

root.AppendChild(newElem);

//("Display the modified XML document

");

//Console.WriteLine(configXmlDoc.OuterXml);

appSettingsNode =newElem;

}

try

{

string key = strKey;

string val = strValue;

//创建结点

XmlNode node = configXmlDoc.CreateNode(XmlNodeType.Element, "add", "");

//创建属性"key"并为其赋值

XmlAttribute attr = configXmlDoc.CreateAttribute("key");

attr.Value = key;

node.Attributes.Append(attr);

//创建属性"value"并为其赋值

attr = configXmlDoc.CreateAttribute("value");

attr.Value = val;

node.Attributes.Append(attr);

appSettingsNode.AppendChild(node);

configXmlDoc.Save(ConfigFullName);

//MessageBox.Show("创建Xml文档结点成功.","系统提示",MessageBoxButtons.OK ,MessageBoxIcon.Information ) ;

}

catch (Exception ex)

{

bflag=false;

throw new ConfigurationException(ex.ToString() );

}

return bflag;

}

/// <summary>

/// Loops through the <code>appSettings</code> NameValueCollection

/// and recreates the XML nodes of the <appSettings> config

/// section accordingly. It saves the configuration file afterwards.

/// </summary>

private void SaveToFile()

{

if (appSettings != null)

{

try

{

XmlDocument configXml = new XmlDocument();

configXml.Load(ConfigFullName);

XmlNode appSettingsNode = configXml.SelectSingleNode("configuration/appSettings");

appSettingsNode.RemoveAll();

for (int i = 0; i < appSettings.Count; i++)

{

string key = appSettings.GetKey(i);

string val = appSettings.Get(i);

XmlNode node = configXml.CreateNode(XmlNodeType.Element, "add", "");

XmlAttribute attr = configXml.CreateAttribute("key");

attr.Value = key;

node.Attributes.Append(attr);

attr = configXml.CreateAttribute("value");

attr.Value = val;

node.Attributes.Append(attr);

appSettingsNode.AppendChild(node);

}

configXml.Save(ConfigFullName);

}

catch (Exception ex)

{

throw new ConfigurationException("Error while saving appSettings.", ex);

}

/// <summary>

/// 更新一条纪录

/// </summary>

/// <param name="strKey"></param>

/// <param name="strNewValue"></param>

/// <returns></returns>

public bool UpdateRecorder(string strKey,string strNewValue)

{

bool flag=true;

try

{

appSettings[strKey]=strNewValue;

SaveToFile();

}

catch(System.Exception err)

{

flag=false;

throw new Exception(err.ToString() ) ;

}

return flag;

}

/// <summary>

/// 读取一个值

/// </summary>

/// <param name="strKey"></param>

/// <returns></returns>

public string ReadSettingsValue(string strKey)

{

LoadFromFile();

return appSettings[strKey].ToString();

}

public bool SaveDataGridChange(DataTable myTable)

{

bool flag=true;

myTable.AcceptChanges();

try

{

// Recreating the config.AppSettings collection with the data contained in appSettings DataGrid.

appSettings.Clear();

foreach (DataRow row in myTable.Rows)

{

appSettings[row["key"].ToString()] = row["value"].ToString();

}

// Saving the appSettings data into the configuration file.

SaveToFile();

}

catch(System.Exception err)

{

flag=false;

throw new Exception (err.ToString() );

}

return flag;

}

// private void getTableChange(DataTable table)

}

使用:

MrfuRWXmlFile mrfurw=new MrfuRWXmlFile();

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

{

MrfuRWXmlFile.CreateXmlFile();

this.button_read.PerformClick();

}

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

{

this.dataGrid1.DataSource=mrfurw.GetSettingsValue();

}

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

{

if(this.textBox_Value.Text.Trim()=="")

return;

mrfurw.UpdateRecorder("SqlStr0",this.textBox_Value.Text.Trim());

this.button_read.PerformClick();

}

int i=0;

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

{

i+=1;

mrfurw.AddNewRecorder( System.DateTime.Now.ToString(),i.ToString());

this.button_read.PerformClick();

}

private void button1_Click(object sender, System.EventArgs e)

{

MessageBox.Show (mrfurw.ReadSettingsValue("SqlStr0" ));

}

private void button2_Click(object sender, System.EventArgs e)

{

DataTable myTable=(DataTable)dataGrid1.DataSource;

mrfurw.SaveDataGridChange(myTable);

}

posted on 2006-07-03 16:18 DotNet编程阅读(986) 评论(0) 收藏举报

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