根据列名

Question

我使用以下代码禁用gridview中列名为test的行。除了第一行，一切正常。颜色不会应用于第一行。我哪里出错？我还想根据列名隐藏一列。

protected void gv_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (Hidden4.Value == "Data Present")
    {
        foreach (GridViewRow item in GdvTestData.Rows)
        {
            int a = GetColumnIndexByName(item, "test");
            int b = GetColumnIndexByName(item, "id");

            if (e.Row.RowType == DataControlRowType.DataRow)
            {
                string test = e.Row.Cells[a].Text;

                foreach (TableCell cell in e.Row.Cells)
                {
                    if (test == "Y")
                    {
                        cell.BackColor = Color.Gray;
                        e.Row.Attributes.Add("onmouseover", "alert('This data is for testing');");
                    }
                }
                e.Row.Cells[b].Visible = false;
            }
        }
    }
}

Answer 1

也许您对数据/业务逻辑和UI感到困惑。

RowDataBound事件每行都有效，因此您不需要循环gridview行。

您正在处理单元格内容，但您已将数据绑定到这些内容。所以：

<强> ASPX

<asp:GridView runat="server" ID="gv" ...
            <Columns>
                <asp:TemplateField>
                    <ItemTemplate>              
                        <asp:Label runat="server" Text='<%# Eval("Test") %>' />
                    </ItemTemplate>
                </asp:TemplateField>
                ...

代码背后

private void GrdBind()
{
    // populate datatable
    gv.DataSource = myDataTable;
    gv.Databind();
}

数据绑定事件：

    protected void gv_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (Hidden4.Value == "Data Present")
        { 
            if (e.Row.RowType == DataControlRowType.DataRow)
            {
               DataRow row = ((DataRowView)e.Row.DataItem).Row;
               string test = row.Field<String>("Test");

               if (test== "Y")
               {
                  e.Row.Cells[0].BackColor = Color.Gray; // set your index
                  e.Row.Attributes.Add("onmouseover", "alert('This data is for testing');");
               }
            }
       }
    }

Answer 2

你可以这样做。虽然我不明白你禁用一行是什么意思。

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

        //find the column value in the row, not the cell text
        string test = row["columnName"].ToString();

        //check the value and if so apply backcolor
        if (test == "Y")
        {
            e.Row.BackColor = Color.Red;

            //or hide the row (no need to do this in Databind or OnPreRender)
            e.Row.Visible = false;
        }
    }
}