default.aspx.cs

C# net Ajax无刷新留言版源码直接解压即可使用

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.IO;
using System.Globalization;

public partial class _Default : System.Web.UI.Page, ICallbackEventHandler
{
    protected void Page_Load(object sender, EventArgs e)
    {
        //注册客户端事件处理方法
        Button3.Attributes.Add("onclick", "CallServer1(TextBox2, Label3);return false;");
        DropDownList1.Attributes.Add("onchange", "CallServer2(this)");
    }

    private string serverReturn;

    public string GetCallbackResult()
    {
        //为便于查看加载效果，添加延时
        System.Threading.Thread.Sleep(2000);
        
        string[] parts = serverReturn.Split('|');
        //根据传递的方法名进行调用，并传递相应的参数，目前只支持一个参数
        return (string)GetType().GetMethod(parts[0]).Invoke(this, new object[] { parts[1] }); 
    }

    public void RaiseCallbackEvent(string eventArgument)
    {
        serverReturn = eventArgument;
    }

    //根据从客户端传来的英文国家名或缩写，翻译成相应的中文国家名
    public string ServerMethod1(string arg)
    {
        string s;
        switch (arg.ToLower())
        {
            case "cn":
            case "china":
                s = "中国";
                break;
            case "us":
                s = "美国";
                break;
            default:
                s = "未知国家";
                break;
        }
        return s;
    }

    //根据从客户端传来的值，对GridView的内容进行更新，并将更新后的GridView的html返回
    public string ServerMethod2(string arg)
    {
        DropDownList1.SelectedValue = arg;
        GridView1.DataBind();

        return RenderControl(GridView1);
    }

    private string RenderControl(Control control)
    {
        StringWriter writer1 = new StringWriter(CultureInfo.InvariantCulture);
        HtmlTextWriter writer2 = new HtmlTextWriter(writer1);

        control.RenderControl(writer2);
        writer2.Flush();
        writer2.Close();

        return writer1.ToString();
    }
}