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>