Question

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的

是带按钮的网格视图

<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>

这是我的代码

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

我收到了这个错误

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

click here to see my screens

Answer 1

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，您可以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;
        }
    }
}

Answer 2

你必须在循环中使用 [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;
        }
    }
}            
}

Answer 3

代码中的一切看起来都非常好。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，你可以改变按键的方式

[
    {
        "value": "4",
        "color": "#f56954",
        "highlight": "#f56954",
        "label": "Clinic 1"
    },
    {
        "value": "0",
        "color": "#f56954",
        "highlight": "#f56954",
        "label": "Clinic 2"
    },
    {
        "value": "0",
        "color": "#f56954",
        "highlight": "#f56954",
        "label": "Clinic 3"
    },
    {
        "value": "0",
        "color": "#f56954",
        "highlight": "#f56954",
        "label": "Clinic 4"
    }
]

如何在gridview中找到按钮

3 个答案: