c#获取或修改配置文件

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Xml;

using System.Windows.Forms;

namespace SZTMinorTool

{

/// <summary>

/// App.config配置类

/// </summary>

public class AppSettings

{

/// <summary>

/// 获取配置文件路径

/// </summary>

/// <returns></returns>

public static string AppConfig()

{

return System.IO.Path.Combine(Application.StartupPath, "App.config");//此处配置文件在程序目录下，或者设置为指定的配置文件路径

}

/// <summary>

/// 获取配置节点值

/// </summary>

/// <param name="appKey">节点key值</param>

/// <returns></returns>

public static string GetValue(string appKey)

{

XmlDocument xDoc = new XmlDocument();

try

{

xDoc.Load(AppSettings.AppConfig());

XmlNode xNode;

XmlElement xElem;

xNode = xDoc.SelectSingleNode("//appSettings");　　　　//补充，需要在你的app.config 文件中增加一下，<appSetting> </appSetting>

xElem = (XmlElement)xNode.SelectSingleNode("//add[@key='" + appKey + "']");

if (xElem != null)

return xElem.GetAttribute("value");

else

return "";

}

catch (Exception)

{

return "";

}

}

/// <summary>

/// 设置配置节点值

/// </summary>

/// <param name="AppKey">key</param>

/// <param name="AppValue">value</param>

public static void SetValue(string AppKey, string AppValue)

{

XmlDocument xDoc = new XmlDocument();

xDoc.Load(AppSettings.AppConfig());

XmlNode xNode;

XmlElement xElem1;

XmlElement xElem2;

xNode = xDoc.SelectSingleNode("//appSettings");

xElem1 = (XmlElement)xNode.SelectSingleNode("//add[@key='" + AppKey + "']");

if (xElem1 != null)

{

xElem1.SetAttribute("value", AppValue);

}

else

{

xElem2 = xDoc.CreateElement("add");

xElem2.SetAttribute("key", AppKey);

xElem2.SetAttribute("value", AppValue);

xNode.AppendChild(xElem2);

}

xDoc.Save(AppSettings.AppConfig());

}

}

}