c# - 如何在选定的索引更改属性上找到 gridview 的数据键值？

Question

我的 gridview 是这样的，但是当我选择查看按钮以查找所选索引上的主键值列已更改时出现错误。请帮助我解决问题。

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="4" ForeColor="#333333" GridLines="None" OnSelectedIndexChanged="GridView1_SelectedIndexChanged">
            <Columns >
                <asp:TemplateField >
                    <ItemTemplate >
                        <asp:Button ID="btnViewComments" Text ="View Comments" runat ="server" CommandName ="select" />
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:BoundField DataField ="forumId" Visible ="false" />
                <%--<asp:CommandField ButtonType ="Button" ShowSelectButton ="true" SelectText ="View Comments"/>--%>
                <asp:TemplateField HeaderText ="Question">
                    <ItemTemplate >
                        <asp:TextBox ID ="txtQuestion" Text ='<%#Eval("question")%>' runat ="server" TextMode ="MultiLine" Height="100" Width ="350"></asp:TextBox>
                       <%-- <%#Eval("question")%>--%>
                    </ItemTemplate>
                    <%--<EditItemTemplate >
                        <asp:TextBox ID ="txtQuestion" Text ='<%#Eval("question")%>' runat ="server" TextMode ="MultiLine" ></asp:TextBox>
                    </EditItemTemplate>--%>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="Poster Name">
                    <ItemTemplate >
                        <%#Eval("posterName") %>
                    </ItemTemplate>
                    <EditItemTemplate >
                        <asp:Label ID ="lblPosterName" Text ='<%#Eval("posterName") %>' runat ="server" ></asp:Label>
                    </EditItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="Date">
                    <ItemTemplate >
                        <%#Eval("dateTim") %>
                    </ItemTemplate>
                    <EditItemTemplate >
                        <asp:Label ID ="lblDateTime" Text ='<%#Eval("dateTim") %>' runat ="server" ></asp:Label>
                    </EditItemTemplate>
                </asp:TemplateField>
            </Columns>
            <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
            <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
            <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
            <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
            <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
            <EditRowStyle BackColor="#999999" />
            <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
        </asp:GridView>

我的代码是......

protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
    {
        try
        {
            Int64 forumId = (Int64)GridView1.SelectedValue;
            Session["forumId"] = forumId;
            Response.Redirect("Thread.aspx");
        }
        catch (Exception)
        {

            throw;
        }
    }

Answer 1

首先，您必须在 GridView 声明中定义字段名称，即要将哪个字段作为数据键。例如，如果您想要“forumId”datakey.than

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="4" ForeColor="#333333" GridLines="None" OnSelectedIndexChanged="GridView1_SelectedIndexChanged"
DataKeyNames="forumId">

而且你可以通过这种方式访问​​

int intforumid = Convert.ToInt32(GridView1.DataKeys[row.RowIndex].Values[0]);