C# MySql gridview delete命令

我有一个

GridView

：

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
        CellPadding="4" DataSourceID="SqlDataSource1" ForeColor="#333333" 
        GridLines="None">
        <AlternatingRowStyle BackColor="White" />
        <Columns>
            <asp:TemplateField ShowHeader="False">
                    <EditItemTemplate>
                        <asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="True" 
                            CommandName="Update" Text="Update"></asp:LinkButton>
                        &nbsp;<asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="False" 
                            CommandName="Cancel" Text="Cancel"></asp:LinkButton>
                    </EditItemTemplate>
                    <ItemTemplate>
                        <asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="False" 
                            CommandName="Edit" Text="Edit"></asp:LinkButton>
                        &nbsp;<asp:LinkButton ID="LinkButton2" runat="server" CausesValidation="False" 
                            CommandName="Delete" 
                            onclientclick="javascript:return confirm('are you sure you want to delete.');" 
                            Text="Delete"></asp:LinkButton>
                    </ItemTemplate>
                </asp:TemplateField>
            <asp:BoundField DataField="id" HeaderText="id" SortExpression="id"/>
            <asp:BoundField DataField="email" HeaderText="email" SortExpression="email" />
            <asp:BoundField DataField="first" HeaderText="first" SortExpression="first" />
            <asp:BoundField DataField="last" HeaderText="last" SortExpression="last" />
            <asp:BoundField DataField="gender" HeaderText="gender" 
                SortExpression="gender" />
            <asp:BoundField DataField="birthday" HeaderText="birthday" 
                SortExpression="birthday" />
        </Columns>
        <FooterStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
        <HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
        <PagerStyle BackColor="#FFCC66" ForeColor="#333333" HorizontalAlign="Center" />
        <RowStyle BackColor="#FFFBD6" ForeColor="#333333" />
        <SelectedRowStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" />
        <SortedAscendingCellStyle BackColor="#FDF5AC" />
        <SortedAscendingHeaderStyle BackColor="#4D0000" />
        <SortedDescendingCellStyle BackColor="#FCF6C0" />
        <SortedDescendingHeaderStyle BackColor="#820000" />
    </asp:GridView>

当我尝试执行删除时，我会出现以下错误：

Parameter '@id' must be defined. 
Exception Details: MySql.Data.MySqlClient.MySqlException: Parameter '@id' must be defined.

---

您可能需要将

DataKeyNames

属性添加到GridView中

必须设置DataKeyNames属性才能使GridView控件的自动更新和删除功能正常工作。这些键字段的值将传递给数据源控件，以指定要更新或删除的行。看到这个了吗

在Gridview的上下文中

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
        CellPadding="4" DataSourceID="SqlDataSource1" ForeColor="#333333" 
        GridLines="None"  DataKeyNames="id,email">

DataKeyNames="id,email"

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
        CellPadding="4" DataSourceID="SqlDataSource1" ForeColor="#333333" 
        GridLines="None"  DataKeyNames="id,email">