ASP.NET中Button控件的OnCommand事件与OnClick事件的不同之处？采用其中的任何一个事件执行的效果基本上都是相同的。它们的不同之处是什

ASP.NET中Button控件的OnCommand事件与OnClick事件的不同之处？采用其中的任何一个事件执行的效果基本上都是相同的。它们的不同之处是什么呢？

解决方案 »

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msdn上已经说的很清楚了当单击 Button 控件时会引发 Command 事件。当命令名（如 Sort）与 Button 控件关联时，通常使用该事件。这使您可以在一个网页上创建多个 Button 控件，并以编程方式确定单击了哪个 Button 控件。
看一下他的例子吧：<%@ Page Language="C#" AutoEventWireup="True" %><html>
<head>   <script runat="server">      void CommandBtn_Click(Object sender, CommandEventArgs e)
      {         switch(e.CommandName)
         {            case "Sort":               // Call the method to sort the list.
               Sort_List((String)e.CommandArgument);
               break;            case "Submit":               // Display a message for the Submit button being clicked.
               Message.Text = "You clicked the <b>Submit</b> button";               // Test whether the Command Argument is an empty string ("").
               if((String)e.CommandArgument == "")
               {
                  // End the message.
                  Message.Text += ".";
               }
               else
               {
                  // Display an error message for the command argument.
                  Message.Text += ", but the command argument is not recogized.";
               }
               break;            default:               // The command name is not recognized. Display an error message.
               Message.Text = "Command name not recogized.";
               break;          }      }      void Sort_List(string commandArgument)
      {         switch(commandArgument)
         {            case "Ascending":

               // Insert code to sort the list in ascending order here.
               Message.Text = "You clicked the <b>Sort Ascending</b> button.";
               break;            case "Descending":

               // Insert code to sort the list in descending order here.
               Message.Text = "You clicked the <b>Sort Descending</b> button.";
               break;            default:

               // The command argument is not recognized. Display an error message.
               Message.Text = "Command argument not recogized.";
               break;         }      }      void Page_Load(Object sender, EventArgs e)
      {         // Manually register the event-handling method for the Command
         // event of the Button controls.
         Button1.Command += new CommandEventHandler(this.CommandBtn_Click);
         Button2.Command += new CommandEventHandler(this.CommandBtn_Click);
         Button3.Command += new CommandEventHandler(this.CommandBtn_Click);
         Button4.Command += new CommandEventHandler(this.CommandBtn_Click);
         Button5.Command += new CommandEventHandler(this.CommandBtn_Click);      }   </script></head>

<body>   <form runat="server">      <h3>Button CommandName Example</h3>      Click one of the command buttons.      <br><br>

      <asp:Button id="Button1"
           Text="Sort Ascending"
           CommandName="Sort"
           CommandArgument="Ascending"
           runat="server"/>             <asp:Button id="Button2"
           Text="Sort Descending"
           CommandName="Sort"
           CommandArgument="Descending"
           runat="server"/>      <br><br>      <asp:Button id="Button3"
           Text="Submit"
           CommandName="Submit"
           runat="server"/>             <asp:Button id="Button4"
           Text="Unknown Command Name"
           CommandName="UnknownName"
           CommandArgument="UnknownArgument"
           runat="server"/>             <asp:Button id="Button5"
           Text="Submit Unknown Command Argument"
           CommandName="Submit"
           CommandArgument="UnknownArgument"
           runat="server"/>

      <br><br>      <asp:Label id="Message" runat="server"/>

   </form>

</body>
</html>
你可以把多个Button绑定到同一个Command上采用不同的Argument来实现不同的功能，这样可以代码重用。Click的话得老实一个一个写了。
举个例子吧
用DATAGRID的话可以用ONCOMMOND来对进行针对某个绑定了数据的单元的操作
而ONCLICK的话只能进行和绑定数据无关的操作...