我如何在datagridview中的控件上分配值 [英] How I assign a value on a control in datagridview

问题描述

我有一个datagridview，它具有一个下拉列表和文本框.我想根据下拉列表的选定值为文本框分配一个值.但是我尝试这样得到错误对象引用未设置为对象的实例".我在这里发布我的代码(错误发生在最后两行):

I have a datagridview that has a dropdownlist and textbox. I want to assign a value to a textbox depending on the selected value of the dropdownlist. But I try this getting the error "Object reference not set to an instance of an object". I post my code here( the error is occurred on the last two line):

foreach (GridViewRow gvr in cgvRequest.Rows)
        {
            //Programmatically access the CheckBox from the TemplateField

            //CheckBoxField chk = (CheckBoxField)gvr.FindControl("chkMark");
            Label lbl = (Label)gvr.FindControl("lblRequestAmount");
            
            TextBox _txtAmount = (TextBox)cgvRequest.FindControl("txtAmount");

            lbl.Text = Convert.ToString(requestinfo.ElementAt(gvr.RowIndex).AmountRequested);
            
            DropDownList ddl = new DropDownList();
            ddl = (DropDownList)cgvRequest.FindControl("ddlApprovalType");
            
            ddl.SelectedValue = "A";
            _txtAmount.Text = lbl.Text;
        }

请帮忙.

Please help.

推荐答案

亲爱的达维特，

解决方案可能是这样的:-

Dear Dawit,

The solution might be like this:-

foreach (GridViewRow gvr in cgvRequest.Rows)
        {
            //Programmatically access the CheckBox from the TemplateField

            //CheckBoxField chk = (CheckBoxField)gvr.FindControl("chkMark");
            Label lbl = (Label)gvr.FindControl("lblRequestAmount");
            
            TextBox _txtAmount = (TextBox)gvr.FindControl("txtAmount");
 
            lbl.Text = Convert.ToString(requestinfo.ElementAt(gvr.RowIndex).AmountRequested);
            
            DropDownList ddl = new DropDownList();
            ddl = (DropDownList)gvr.FindControl("ddlApprovalType");
            
            ddl.SelectedValue = "A";
            _txtAmount.Text = lbl.Text;
        }

我已经用foreach循环的[gvr]对象替换了GridID [cgvRequest]

如果有帮助，请将其标记为您的答案.

谢谢

Varun Sareen

I have replaced the GridID [cgvRequest] by [gvr] object of foreach loop

Mark this as your answer if it helps you out.

Thanks

Varun Sareen

对于那个标签，您想要将数据分配给哪个控件以及哪个控件?

首先让我澄清一下，以便我可以帮助您?

Hi ,

What for that label, to which control you want to assign the data and of which control ?

Let me clarify this first, so that i can help you ?

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