设定数据在GridView的标签 [英] Set data to a label in GridView

问题描述

我有一个asp GridView的一个标签，我想绑定数据集到它。
结果这里是我的RowDataBound方法：

 保护无效GridView1_RowDataBound（对象发件人，GridViewRowEventArgs E）
{
    变量名称=（标签）e.Row.FindControl（LABEL_NAME）;
    name.Text =萨拉;
    name.DataBind（）;
}
 

和这里是我的GridView：

 ＆LT; ASP：GridView控件ID =GridViewCertificateType=服务器的AutoGenerateColumns =FALSEOnRowDataBound =GridView1_RowDataBound＆GT;＆LT; ASP：标签ID =LABEL_NAME=服务器文本=＆GT;＆LT; / ASP：标签＆gt;
 

但经过 name.Text =萨拉; ，我收到此异常：

 对象引用未设置到对象的实例。
 

解决方案

在您的RowDataBound方法，确保你有一个条件检查该行的类型是什么。本次活动将在你的GridView调用的每一行，包括页眉和页脚行。如果标题行中没有找到 LABEL_NAME ，你就会有一个空的对象。一旦你这样做，摆脱 name.DataBind（）的; ，因为它不需要

 保护无效GridView1_RowDataBound（对象发件人，GridViewRowEventArgs E）
{
    如果（e.Row.RowType == DataControlRowType.DataRow）
    {
        变量名称=（标签）e.Row.FindControl（LABEL_NAME）;
        name.Text =萨拉;
    }
}
 

I have a label in an asp GridView and I want to set bind data to it.
Here is my RowDataBound method:

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    var name = (Label)e.Row.FindControl("Label_name");
    name.Text ="sara";      
    name.DataBind();
}

and here is my GridView:

<asp:GridView ID="GridViewCertificateType" runat="server" AutoGenerateColumns="False"   OnRowDataBound="GridView1_RowDataBound" >

<asp:Label ID="Label_name" runat="server" Text="" ></asp:Label>

But after name.Text ="sara";, I receive this exception:

Object reference not set to an instance of an object. 

解决方案

In your RowDataBound method, make sure you have a condition to check what the type of the row is. This event will be called for every row in your GridView, including header and footer rows. If Label_name is not found in the header row, you'll have a null object. Once you do that, get rid of name.DataBind();, as it is not needed.

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        var name = (Label)e.Row.FindControl("Label_name");
        name.Text = "sara"; 
    }
}

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