C# 如何在gridview中查找按钮

我的项目中有gridview，gridview中有一个按钮。 我想根据gridview单元格值更改该按钮的属性

下面是我的gridview和按钮

<div class="row">
    <div class="col-md-12">
        <h1 style="color:red" id="payDetailH" runat="server" visible="false">Payment Details</h1>
        <br />
        <asp:Panel ID="Panel2" runat="server" ScrollBars="Auto">
        <asp:GridView ID="gvPayemenDetailNew" CssClass="table table-hover" GridLines="None" runat="server"  
             OnRowCommand="gvPayemenDetailNew_RowCommand" OnRowDataBound="gvPayemenDetailNew_RowDataBound" >
            <Columns>
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:Button ID="btnGenNew" runat="server" CommandName="GJobID" CommandArgument="<%# ((GridViewRow) Container).RowIndex %>" Text="Ceate Job" CssClass="btn" Enabled="False" />
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
            <HeaderStyle Height="50px" HorizontalAlign="Center" VerticalAlign="Middle" />
        </asp:GridView>
        </asp:Panel>
       </div>
</div>

我犯了这个错误

System.NullReferenceException: Object reference not set to an instance of an object.

必须在循环中使用[row]：

protected void gvPayemenDetailNew_RowDataBound(object sender, 
GridViewRowEventArgs e)
{
foreach (GridViewRow row in gvPayemenDetailNew.Rows)
{
    if (row.RowType == DataControlRowType.DataRow)
    {
        Button btn = row.FindControl("btnGenNew") as Button;
        if (PayStatus == "Approved")
        {
            btn.Enabled = true;
        }
    }
}            
}

---

代码中的一切看起来都很好。这是查找控件的正确方法。只有一个建议，但不确定它是否会起作用，你可以改变你打字的方式

Button btn = (Button)e.Row.FindControl("btnGenNew");

---

您不需要在RowDataBound事件中循环GridView。当数据绑定到GridView时，它已经在每行执行。在循环中，根据最后一行值设置所有按钮，而不是每行

所以这应该是正确的方法，假设PayStatus是绑定到GridView的数据集中的一列

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    //check if the row is a datarow
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        //cast the row back to a datarowview
        DataRowView row = e.Row.DataItem as DataRowView;

        //find the button with findcontrol
        Button btn = e.Row.FindControl("btnGenNew") as Button;

        //use the paystatus of the current row to enable the button
        if (row["PayStatus"].ToString() == "Approved")
        {
            btn.Enabled = true;
        }
    }
}

---

谢谢你的回复，先生，但是我的问题已经解决了。但是尽量避免在rowdatabound事件中循环gridview。

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    //check if the row is a datarow
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        //cast the row back to a datarowview
        DataRowView row = e.Row.DataItem as DataRowView;

        //find the button with findcontrol
        Button btn = e.Row.FindControl("btnGenNew") as Button;

        //use the paystatus of the current row to enable the button
        if (row["PayStatus"].ToString() == "Approved")
        {
            btn.Enabled = true;
        }
    }
}