ASP.NET 在程序中动态删除、修改配置文件节点值的方法

第一步：在App_Code文件夹下新建一个类ReadWriteConfig，代码在博文后面，可以完全复制 第二步：如果在Web.config中有以下的节点及值，可以按第三步中的方法进行操作 <appSettings> <add key="FileUploadSize" value="10240" /> <add key="FileUploadType" value="JPG|GIF|PNG" />
</appSettings>
第三步：使用ReadWriteConfig类进行操作 （1）修改节点值 bool b = false; //成功操作的返回值
ReadWriteConfig config = new ReadWriteConfig();
b = config.SetValue("FileUploadSize", 一个新值); (2) 删除节点 ReadWriteConfig config = new ReadWriteConfig();
config.removeElement("FileUploadType"); (3) 查看节点值 ReadWriteConfig config = new ReadWriteConfig();
SearchedValue = config.readConfigDoc("FileUploadSize"); 搞定，收工！！！！ 有什么问题的话可以直接留言哟…………………… ReadWriteConfig类的内容 using System;
using System.Configuration;
using System.Reflection;
using System.Web;
using System.Xml;
public enum ConfigFileType
{
WebConfig,
AppConfig
} /// <summary>
/// Summary description for ReadWriteConfig.
/// </summary>
public class ReadWriteConfig
{
public string docName = String.Empty;
private XmlNode node = null;
private int _configType;
public int ConfigType
{
get { return _configType; }
set { _configType = value; }
} #region SetValue
public bool SetValue(string key, string value)
{
XmlDocument cfgDoc = new XmlDocument();
loadConfigDoc(cfgDoc);
// retrieve the appSettings node
node = cfgDoc.SelectSingleNode("//appSettings");
if (node == null)
{
throw new InvalidOperationException("appSettings section not found");
}
try
{
// XPath select setting "add" element that contains this key
XmlElement addElem = (XmlElement)node.SelectSingleNode("//add[@key='" + key + "']");
if (addElem != null)
{
addElem.SetAttribute("value", value);
}
// not found, so we need to add the element, key and value
else
{
XmlElement entry = cfgDoc.createElement_x_x_x_x_x("add");
entry.SetAttribute("key", key);
entry.SetAttribute("value", value);
node.AppendChild(entry);
}
//save it
saveConfigDoc(cfgDoc, docName);
return true;
}
catch
{
return false;
}
} #endregion #region saveConfigDoc
private void saveConfigDoc(XmlDocument cfgDoc, string cfgDocPath)
{
try
{
XmlTextWriter writer = new XmlTextWriter(cfgDocPath, null);
writer.Formatting = Formatting.Indented;
cfgDoc.WriteTo(writer);
writer.Flush();
writer.Close();
return;
}
catch
{
throw;
}
} public string readConfigDoc(string elementKey)
{
try
{
XmlDocument cfgDoc = new XmlDocument();
loadConfigDoc(cfgDoc);
// retrieve the appSettings node
node = cfgDoc.SelectSingleNode("//appSettings");
if (node == null)
{
throw new InvalidOperationException("appSettings section not found");
}
XmlElement addElem = (XmlElement)node.SelectSingleNode("//add[@key='" + elementKey + "']"); if (addElem != null)
{
return addElem.GetAttribute("value");
}
// not found, so we need to add the element, key and value
else
{
return "";
}
}
catch
{
return "";
}
}
#endregion #region removeElement
public bool removeElement(string elementKey)
{
try
{
XmlDocument cfgDoc = new XmlDocument();
loadConfigDoc(cfgDoc);
// retrieve the appSettings node
node = cfgDoc.SelectSingleNode("//appSettings");
if (node == null)
{
throw new InvalidOperationException("appSettings section not found");
}
// XPath select setting "add" element that contains this key to remove
node.RemoveChild(node.SelectSingleNode("//add[@key='" + elementKey + "']"));
saveConfigDoc(cfgDoc, docName);
return true;
}
catch
{
return false;
}
}
#endregion #region modifyElement
public bool modifyElement(string elementKey)
{
try
{
XmlDocument cfgDoc = new XmlDocument();
loadConfigDoc(cfgDoc);
// retrieve the appSettings node
node = cfgDoc.SelectSingleNode("//appSettings");
if (node == null)
{
throw new InvalidOperationException("appSettings section not found");
}
// XPath select setting "add" element that contains this key to remove
node.RemoveChild(node.SelectSingleNode("//add[@key='" + elementKey + "']"));
saveConfigDoc(cfgDoc, docName);
return true;
}
catch
{
return false;
}
}
#endregion #region loadConfigDoc
private XmlDocument loadConfigDoc(XmlDocument cfgDoc)
{
// load the config file
if (Convert.ToInt32(ConfigType) == Convert.ToInt32(ConfigFileType.AppConfig))
{
docName = ((Assembly.GetEntryAssembly()).GetName()).Name;
docName += ".exe.config";
}
else
{
docName = HttpContext.Current.Server.MapPath("~/Web.config"); //你的配置文件名称
}
cfgDoc.Load(docName);
return cfgDoc;
}
#endregion
}