1.首先繼承 ICallbackEventHandler
2.在Page_Load 裡面
ClientScriptManager scriptManager = this.Page.ClientScript;
string eventRef = scriptManager.GetCallbackEventReference(this, "argVal", "OnCallComplete", "ctxVal", "OnErrorOccurs", true);
3.Server:
/// <summary>
/// 接受客戶端的參數 進行運算
/// </summary>
/// <param name="eventArgument"></param>
public void RaiseCallbackEvent(string eventArgument)
{
strCallResult = voidtt();
}
/// <summary>
/// 返回CallBack的結果
/// </summary>
/// <returns></returns>
public string GetCallbackResult()
{
return strCallResult;
}
4.For Example:
<html xmlns="http://www.w3.org/1999/xhtml" ><head runat="server"> <title>Untitled Page</title> 
<script type="text/javascript">
var value_1=""; function tt()
{ //doOther();
} function ProcessCallBackError(arg, context) { alert('error!'); }
</script></head><body> <form id="form1" runat="server"> <div> <span id="Message_1"></span> <input type="button" value="tt" onclick="callServerData(value_1,tt)" /> </div> </form></body></html> public string outputCount = ""; protected void Page_Load(object sender, EventArgs e) { 
if (!IsPostBack) { }
ClientScriptManager csm = Page.ClientScript; StringBuilder context = new StringBuilder(); context.Append("function ReturnServerValue(arg, context)"); context.Append("{"); context.Append("Message_1.innerText = arg; "); context.Append("value_1 = arg;"); context.Append("}"); String callbackReference = csm.GetCallbackEventReference(this, "arg", "ReturnServerValue", context.ToString()); String callbackspt = "function callServerData(arg,context) {" + callbackReference + ";}"; csm.RegisterClientScriptBlock(this.GetType(), "callServerData",callbackspt,true); } /// <summary> /// 接受客戶端傳回的參數 /// </summary> /// <param name="eventArgument"></param> public void RaiseCallbackEvent(String eventArgument) { try { outputCount = eventArgument.ToString(); } catch { outputCount = "output"; } } /// <summary> /// Define method that returns callback result.(將運算好的結果返回) /// </summary> /// <returns></returns> public string GetCallbackResult() { return outputCount; }