用户代码asp.net未处理nullreferenceexception [英] nullreferenceexception was unhandled by user code asp.net

问题描述

每当我在下面编写代码时，我在rbYes.Checked == true时得到错误，因为nullreferenceexception未被用户代码asp.net处理

whenever i am excuting the below code am getting the error at the rbYes.Checked==true as nullreferenceexception was unhandled by user code asp.net

protected void rgDesignation_ItemCommand(object source, GridCommandEventArgs e)
  {
      if (e.CommandName == "InitInsert")
      {
          for (int k = 0; k < rgDesignation.Items.Count; k++)
          {
              if (rgDesignation.Items[k].Edit)
              {
                  e.Canceled = true;
                  return;
              }
          }
      }
      if (e.CommandName == "Edit")
      {
          if (rgDesignation.MasterTableView.IsItemInserted)
          {
              e.Canceled = true;
              return;
          }
          GridEditableItem editItem = (GridEditableItem)e.Item;
          RadTextBox txDesignation = (RadTextBox)editItem.FindControl("txDesignation");

          RadioButton rbYes = (RadioButton)editItem.FindControl("rbYes");
          RadioButton rbNo = (RadioButton)editItem.FindControl("rbNo");
          RadioButton rbUser = (RadioButton)editItem.FindControl("rbUser");
          int DesgID = (int)e.Item.OwnerTableView.DataKeyValues[e.Item.ItemIndex]["DesgID"];
          DataView dv;
          DataSet ds = new DataSet();
          ds = DataAccessLayer.BindDataQuery("select Estatus1 from tblDesignations where DesgID='" + DesgID + "'");
          dv = ds.Tables[0].DefaultView;
          int Name;
          // args.IsValid = true;

          //foreach (DataRowView datarow in dv)
          //{
              int a = 1, b = 2, c = 3;
              Name = Convert.ToInt32(ds.Tables[0].Rows[0]["Estatus1"]);
              if (Name == a)
              {
                  rbYes.Checked = true;
                  rbNo.Checked = false;
                  rbUser.Checked = false;
              }
              else if (Name==b)
              {
                  rbNo.Checked = true;
                  rbYes.Checked = false;
                  rbUser.Checked = false;
              }
              else
              {
                  rbUser.Checked = true;
                  rbNo.Checked = false;
                  rbYes.Checked = false;
              }

          //}
      }
  }

推荐答案

此异常显示是因为控件无法检测到。

表示：无法呈现控件。



检查名称rbYes是否正确。



休息看起来没问题。

This Exception is showing because the control is unable to detect.
Means:unable to render the control.

Check the name "rbYes" is correct or not.

rest looks ok.

FindControl 可能找不到您在该行指定的名称：

The FindControl is probably not finding the name you specified at the line :

RadioButton rbYes = editItem.FindControl("rbYes");

检查名称rbYes是否正确。

Check the name "rbYes" is correct.

基本上，您的代码无法找到名为rbYes的控件。

Basically, your code failed to find a control called "rbYes".

RadioButton rbYes = (RadioButton)editItem.FindControl("rbYes");

检查一下r editItem 实际上包含了这个，或者你拼写正确。

Check that your editItem actually contains this, or that you have spelled it correctly.

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