我的代码在c＃中不能用于转发器控制验证 [英] My code is not working in repeater control validation in c#

问题描述

转发器控制如下

课程金额主要代码
 
 RPST 400 PSTF 
 RPSCRB 500 PSTF 
 MFA 600 AMC 

i想验证第2行和第3行主码必须相同。

我写了如下代码

  protected   void  Button1_Click（ object  sender，EventArgs e）
 {
  string  code =  string  .Empty; 
  string  code1 =  string  .Empty; 
 code =（ this  .rptcart.Items [ 2 ]。FindControl（  Majorcode） as  Label）.Text; 
 code1 =（ this  .rptcart.Items [ 3 ]。FindControl（  Majorcode） as  Label）.Text; 
 
  if （code！= code1）
 {
 lblmsg.Text =  主要代码必须相同; 
  return ; 
} 
} 

当我运行上面的代码时，显示错误如下

  object 引用 set 为 object的实例。

以上错误在下面的行显示如下

 code =（ this  .rptcart.Items [ 2 ]。FindControl（  Majorcode） as  Label）.Text; 

请帮助我从上面的代码我犯了什么错误。

解决方案

你想要比较列 Majorcode 的第2行和第3行，所以你应该读取索引1和2，而不是2和3.

 code =（ this  .rptcart.Items [ 1 ]。FindControl（  Majorcode） as  Label）.Text; 
 code1 =（ this  .rptcart.Items [ 2 ]。FindControl（  Majorcode） as  Label）.Text; 

Repeater control as follows

Course   Amount   Majorcode

RPST     400    PSTF
RPSCRB   500    PSTF
MFA      600     AMC

i want to validate the 2nd row and 3rd row Majorcode must the same be same.
for that i written a code as follows

protected void Button1_Click(object sender, EventArgs e)
{
    string code = string.Empty;
    string code1 = string.Empty;
    code = (this.rptcart.Items[2].FindControl("Majorcode") as Label).Text;
    code1 = (this.rptcart.Items[3].FindControl("Majorcode") as Label).Text;

    if (code != code1)
    {
        lblmsg.Text = "Majorcode must be the same";
        return;
    }
}

When i run the above code shows errors as follows

object reference not set to an instance of object.

The above error shows in below line as follows

code = (this.rptcart.Items[2].FindControl("Majorcode") as Label).Text;

please help me from my above code what is the mistake i made.

解决方案

As you want to compare the column Majorcode of 2nd and 3rd Row, so you should read the index 1 and 2, not 2 and 3.

code = (this.rptcart.Items[1].FindControl("Majorcode") as Label).Text;
code1 = (this.rptcart.Items[2].FindControl("Majorcode") as Label).Text;

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