CommandEventArgs类学习

1.CommandEvent类的作用——为Command事件提供数据

语法（C#）Public class CommandEventArgs: EventArgs;从中可以看出该类继承了EventArgs类

2.构造函数

（1）CommandEventArgs(CommandEventArgs)——Initializes a new instance of the CommandEventArgs class with another CommandEventArgs object.

语法：

public CommandEventArgs(CommandEventArgs e )

（2）CommandEventArgs(String, Object)——Initializes a new instance of the CommandEventArgs class with the specified command name and argument.

语法：

public CommandEventArgs(string commandName,Object argument)

 

3.属性

(1)CommandArgument—— Gets the argument for the command.

(2)CommandName——Gets the name of the command.

<asp:LinkButton ID="ActiveButton" Text="Active" CommandName="show" CommandArgument="0" OnCommand="Select_Command" runat="server"/>

protected void Select_Command(object sender, CommandEventArgs e)
    {
        
        ListDataSource.SelectParameters["IsComplete"].DefaultValue =
            e.CommandArgument.ToString();
        if (e.CommandName == "show")
            SearchText.Text = "";
        ViewState["CurrentTab"] = e.CommandArgument;
    }

object sender,在以上代码中sender指代的是——System.Web.UI.WebControls.LinkButton

CommandEventArgs e,e为CommandEventArgs的一个实例，用e.CommandArgument和e.CommandName来获取该对象的属性