asp.net：如何使用通过按钮的onclick参数EventArgs的？ [英] asp.net :how to use eventargs for parameter passing on button onclick?

问题描述

我已经看到了一些code，使人们传递参数，通过网络的commandParameter物业control.then什么用的EventArgs的。

i have seen some code in which people pass parameter through commandParameter Property of web control.then what is use of eventargs.

推荐答案

如果您有不同的按钮同样的事件处理程序的方法，这非常有用。例如，假设您的标记看起来像这样：

This can be useful if you have the same EventHandler method for different buttons. Example, say your markup looks like this:

<asp:Button ID="button1" runat="server" CommandArgument="MyVal1"
   CommandName="ThisBtnClick" OnClick="MyBtnHandler" />
<asp:Button ID="button2" runat="server" CommandArgument="MyVal2"
   CommandName="ThatBtnClick" OnClick="MyBtnHandler" />

您可以有两个按钮相同的事件处理程序和分化基础上的CommandName：

You can have the same event handler for both buttons and differentiate based on the CommandName:

protected void MyBtnHandler(Object sender, EventArgs e)
{
     Button btn = (Button)sender;
          switch (btn.CommandName)
          {
                case "ThisBtnClick":
                    DoWhatever(btn.CommandArgument.ToString());
                    break;
                case "ThatBtnClick":
                    DoSomethingElse(btn.CommandArgument.ToString());
                    break;
           }
}

来源： aspnet-passing-parameters-in-button-click-handler

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