Question

使用<asp:GridView></asp:GridView>我试图显示数据库表的列。我想获取表的主键但显然不想显示它。我怎样才能做到这一点？
这是我的GridView

<asp:GridView ID="MyGrid" runat="server" BorderColor="#0066FF" AllowPaging="false" PageSize="5" AllowSorting="true" AutoGenerateColumns="false"
         AutoGenerateEditButton="true" OnRowEditing="MyGrid_RowEditing" AutoGenerateDeleteButton="true" OnRowDeleting="MyGrid_RowDeleting"
         OnRowDataBound="MyGrid_RowDataBound" EmptyDataText="No Value" BorderWidth="0px" BorderStyle="Solid">
    <Columns>
        <asp:BoundField DataField="PrimaryKey" HeaderText="UserId"/>
        <asp:BoundField DataField="Column1" HeaderText="Column1" />
        <asp:BoundField DataField="Column2" HeaderText="Column2" />
        <asp:BoundField DataField="Column3" HeaderText="Column3" />
    </Columns>
</asp:GridView>

我还尝试visible=false隐藏主键，它隐藏了主键，但也没有获取其值，我想要这个值。
希望我的问题很明确。

Answer 1

您需要在OnRowDataBound事件中设置Visible = false，这意味着您仍然可以访问数据，但不会在页面上显示。

<asp:GridView ID="MyGrid" runat="server" BorderColor="#0066FF" 
    AllowPaging="false" PageSize="5" AllowSorting="true" 
    AutoGenerateColumns="false" AutoGenerateEditButton="true"      
    OnRowEditing="MyGrid_RowEditing" AutoGenerateDeleteButton="true" 
    OnRowDeleting="MyGrid_RowDeleting"
    OnRowDataBound="MyGrid_RowDataBound" EmptyDataText="No Value" 
    BorderWidth="0px" BorderStyle="Solid">
    <Columns>
        <asp:BoundField DataField="PrimaryKey" HeaderText="UserId"/>
        <asp:BoundField DataField="Column1" HeaderText="Column1" />
        <asp:BoundField DataField="Column2" HeaderText="Column2" />
        <asp:BoundField DataField="Column3" HeaderText="Column3" />
    </Columns>
</asp:GridView>

在Codebehind中：

protected void MyGrid_RowDataBound(object sender, GridViewRowEventArgs e)
{
    e.Row.Cells[0].Visible = false;
}

Answer 2

<asp:GridView ... DataKeyNames="PrimaryKey" />

Answer 3

您可以使用：

<asp:BoundField DataField="PrimaryKey" visible="false" HeaderText="PKId"/>

还可以使用this

Answer 4

<asp:BoundField DataField="PrimaryKey" visible="false" HeaderText="UserId"/>

获取主键

<asp:GridView ID="MyGrid" runat="server" BorderColor="#0066FF" DataKeyNames="PrimaryKey"

MyGrid.DataKeys[e.NewEditIndex].Value

OR

MyGrid.Rows[e.NewEditIndex].DataBoundItem

Answer 5

如果要在GridView中按名称而不是其索引隐藏列。在创建DataTable或Dataset之后，您必须按名称查找列的索引，然后将索引保存在全局变量中，如ViewStae，Session等，然后在RowDataBound中调用它，如示例所示：

string headerName = "Id";
            DataTable dt = .... ;

            for (int i=0;i<dt.Columns.Count;i++)
            {
                if (dt.Columns[i].ColumnName == headerName)
                {
                    ViewState["CellIndex"] = i;

                }

            }

      ... GridView_RowDataBound(object sender, GridViewRowEventArgs e)
    {

        if (e.Row.RowType == DataControlRowType.Header || e.Row.RowType == DataControlRowType.DataRow || e.Row.RowType == DataControlRowType.Footer)
        {

            int index = Convert.ToInt32(ViewState["CellIndex"]);

            e.Row.Cells[index].Visible = false;
        }                        
    }

如何在GridView中获取主键但不显示它？

5 个答案: