对象引用未设置为对象的实例

问题描述

您好，

i我正在尝试在gridview的RowDataBound事件中设置位于gridview中的标签文本。该代码的代码如下：

Hello,
i am trying to set label text which resides in gridview on RowDataBound event of gridview.The code for the same is as follows:

protected void GridView2_RowDataBound(object sender, GridViewRowEventArgs e)
        {
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                int day=Convert.ToInt32(DropDownList3.SelectedValue);
                int days = System.DateTime.DaysInMonth(2013,day);
                Label lab = (Label)e.Row.FindControl("d");
                lab.Text=days.ToString();
            }
        }

在上面的代码中，''''是gridview中标签的id。在突出显示的行中，我收到错误对象参考没有设置为对象的实例。据我所知，新的标签没有被创建。然后如何将在此事件中计算的值分配给gridviews标签？任何帮助都非常适合...

问候

In the above code,''d'' is the id of the label in the gridview.On the highlighted line i am getting error that OBJECT REFERENCE NOT SET TO INSTANCE OF AN OBJECT.As per as i understand,the new label is not being created.then how to assign values calculated in this event to gridviews label?Any help is greatly appriciated...
Regards

推荐答案

DataControlRowType rtype = e.Row.RowType;
if (rtype == DataControlRowType.DataRow && rtype != DataControlRowType.Footer && rtype != DataControlRowType.Header)
{
 //
} 

在DEBUG模式下方法中简单使用断点将清除所有疑点和可能的修复。

A simple use of breakpoint in the method in DEBUG mode will clear all the doubts and possible fix.

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