C#通用类实现 读取xml控制Asp.net控件输入信息长度（TextBox，FileUpload）

using System;
using System.Xml;
using System.Configuration;
using System.Web;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace XMLSize
{
public struct strRestric
{
public string msgPage;
public string msgPrompt;
public int size;
}

public class XmlRestrict
{
public static strRestric res;

public XmlRestrict()
{
res.msgPage="";
res.msgPrompt="";
res.size=0;
}

public static object Restrict(string xmlPathName,string nodeID,strRestric res)
{
int NodeNum=1;
string path="";
path =ConfigurationSettings.AppSettings.Get(xmlPathName).ToString();
path+="Restrict.xml";
try
{
XmlDocument xmlDoc=new XmlDocument();
xmlDoc.Load(path);
XmlNodeList nodeList=xmlDoc.SelectSingleNode("Tree").ChildNodes;

foreach(XmlNode xn in nodeList)
{
XmlElement xe=(XmlElement)xn;

if(xe.Name=="Node")
{
XmlNodeList nls=xe.ChildNodes;
foreach(XmlNode xn1 in nls)
{
XmlElement xe2=(XmlElement)xn1;
if(xe2.Name=="PageId")
{
if(xe2.InnerText==nodeID)
{
XmlNode xnChild=(XmlNode)xe2;
XmlNode child=xnChild.ParentNode.ChildNodes[NodeNum+1];
XmlElement xeChild=(XmlElement)child;
string Id=xeChild.GetAttribute("value");
int Pid=int.Parse(Id);
res.msgPage=child.InnerText.ToString();
res.msgPrompt=xnChild.ParentNode.ChildNodes[NodeNum+2].InnerText.ToString();
res.size=Pid;
return res;
}
break;
}
}
}
}
}
catch
{}
return null;

}

页面内调用

private void Page_Load(object sender, System.EventArgs e)
{

strMsg="";

///////////////////////////////////////////////////////////////////////////////
object obj;
obj=XMLSize.XmlRestrict.Restrict("webPath","Notice_Login_txtContent",XmlRestrict.res);
XMLSize.XmlRestrict.res=(strRestric)obj;

string msgContent=XmlRestrict.res.msgPage;
string msgPrompt=XmlRestrict.res.msgPrompt;
int txtContentSize=XmlRestrict.res.size;

this.lblTxt.Text=msgContent;
this.txtContent.MaxLength=txtContentSize;
this.strMsg=msgPrompt;

//////////////////////////////////////////////////////////////////////////////

}

XML文件


<?xml version="1.0" encoding="utf-8" ?>






<Tree>




<Node>


<Name></Name>


<PageId>Notice_Login_txtContent</PageId>


<Control value="5"></Control>


<Message></Message>


</Node>
<Node>


<Name></Name>


<PageId></PageId>


<Control value="5"></Control>


<Message></Message>


</Node>




</Tree>