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c#委托入门讲解实例

    博客分类：
  • c#
C#CC++ASPLinq 
阅读更多

文件 test1.aspx 

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class test1 : System.Web.UI.Page
{
    /// <summary>
    /// 申明委托 ，在包里或者类里，public
    /// </summary>
    /// <param name="strUrl">url地址</param>
    /// <param name="strTitle">连接标题</param>
    /// <returns></returns>
    public delegate string  DelegateSampleSum(string strUrl, string strTitle);
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void btn_delegateTest_Click(object sender, EventArgs e)
    {
        //利用委托调用函数 appendString
        DelegateSampleSum deTest = new DelegateSampleSum(appendString);
        lbl_show.Text = deTest("http://www.my400800.cn", "400电话");
    }

    /// <summary>
    /// 定义调用委托的函数，在呼叫者里要有委托的实例（呼叫者扔出一个委托，被呼叫者给这个委托赋值）
    /// </summary>
    /// <param name="addNum"></param>
    /// <returns></returns>
    public string appendString(string strUrl, string strTitle)
    {
        string strRet = "";
        strRet = string.Concat("<a href=\"", strUrl, "\">", strTitle, "</a>");
        return strRet;

    }
}

 

文件 test1.aspx.cs 

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="test1.aspx.cs" Inherits="test1" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
        <asp:Label ID="lbl_show" runat="server" Text="显示处理结果"></asp:Label>
        <br />
        <br />
        <br />
        <asp:Button ID="btn_delegateTest" runat="server" 
            onclick="btn_delegateTest_Click" Text="c#委托测试" />
    
    </div>
    </form>
</body>
</html>
 

 

输出Html结果 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head><title>
	Untitled Page
</title></head>
<body>
    <form name="form1" method="post" action="test1.aspx" id="form1">
<div>
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUKLTE2MjY5MTY1NQ9kFgICAw9kFgICAQ8PFgIeBFRleHQFLjxhIGhyZWY9Imh0dHA6Ly93d3cubXk0MDA4MDAuY24iPjQwMOeUteivnTwvYT5kZGRZZEKD2p9IkYmfo7145J/l+5q8cQ==" />
</div>

<div>

	<input type="hidden" name="__EVENTVALIDATION" id="__EVENTVALIDATION" value="/wEWAgLxorv8AwK+3u2SA3AjPKDa3B6y3blg0YPBn1vLksJn" />
</div>
    <div>
    
        <span id="lbl_show"><a href="http://www.my400800.cn">400电话</a></span>
        <br />
        <br />
        <br />
        <input type="submit" name="btn_delegateTest" value="c#委托测试" id="btn_delegateTest" />
    
    </div>
    </form>
</body>
</html>

 

 

输出显示结果

 

Untitled Page

 

注意：

 

 

 public delegate string  DelegateSampleSum(string strUrl, string strTitle);

和函数

public string appendString(string strUrl, string strTitle)
    {
        string strRet = "";
        strRet = string.Concat("<a href=\"", strUrl, "\">", strTitle, "</a>");
        return strRet;

    }

 

的返回值变量个数，变量类型必须一致，不然无法通过编译。

 

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