如何在LinkBut​​ton1_Command中更改链接按钮颜色 [英] how to change link button color in LinkButton1_Command

问题描述

您好，







如何更改链接按钮颜色
$ b链接命令事件中的$ b

Hello,



how to change the link button color
in the link command event

protected void LinkButton1_Command(object source, CommandEventArgs e)
   {
       if (e.CommandName.Equals("Paging"))
       {
           var lbtn = (LinkButton)FindControl("LinkButton1" + e.CommandArgument);
           lbtn.ForeColor = System.Drawing.Color.Red;


          
           lbtn.ForeColor = System.Drawing.Color.Blue;
       }
   }

i正在做但是null异常thow

如何找到链接控制





Regrads

Sadhana.R.Belge

i am doing but null exception thow
how can i find link Control


Regrads
Sadhana.R.Belge

推荐答案

只需添加到CommandArgument参数并在Click处理程序上读取它：



在ASPX中

Just add to the CommandArgument parameter and read it out on the Click handler:

In ASPX

<asp:LinkButton ID="ENameLinkBtn" runat="server"
    style="font-weight: 700; font-size: 8pt;" CommandArgument="YourValueHere"
    OnClick="LinkButton1_Command" >

在代码背后

In Code Behind

protected void LinkButton1_Command(object sender, CommandEventArgs e)
{
    LinkButton btn = (LinkButton)(sender);
    string yourValue = btn.CommandArgument; // e.CommandArgument
    if(btn != null)
    {
       // do what you need here
       btn.ForeColor = System.Drawing.Color.Red;    
    }
}

这是因为 lbtn ，由<$返回c $ c> FindControl 返回null。您需要找到正确的

id 作为控件。在尝试取消引用变量之前，请务必检查类似于null的变量。



另请参阅我最近的答案：对象引用未设置为对象实例 [ ^ ]。< br $>

-SA

This happens because lbtn, returned by FindControl returns null. You need to find out correct
id for the control. Always check a variable like that for null before trying to dereference a variable.

See also my recent answer: Object Reference not set to an instance of object[^].

—SA

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