c# - 从 GridView 中删除记录时出错

Question

我有一个带有以下标记的 GridView 控件:

 <asp:GridView ID="gvGroups" runat="server" Width="100%" AutoGenerateColumns="False"
            ShowFooter="True" BorderColor="White" BorderStyle="Ridge" CellSpacing="1" BorderWidth="2px"
            BackColor="White" CellPadding="3" GridLines="None" Font-Names="Tahoma" Font-Size="11px"
            DataKeyNames="GroupId" OnRowDeleting="gvGroups_RowDeleting">
            <FooterStyle BackColor="#C6C3C6" ForeColor="Black" />
            <RowStyle BackColor="#DEDFDE" ForeColor="Black" />
            <HeaderStyle BackColor="#4A3C8C" Font-Bold="True" ForeColor="#E7E7FF" />
            <Columns>
                <asp:TemplateField HeaderText="Row">
                    <ItemTemplate>
                        <asp:Literal ID="litRowNumberNormal" runat="server"></asp:Literal>
                    </ItemTemplate>
                    <FooterTemplate>
                        <asp:Literal ID="litRowNumberFooter" runat="server"></asp:Literal>
                    </FooterTemplate>
                    <ItemStyle HorizontalAlign="Center" />
                    <FooterStyle HorizontalAlign="Center" />
                </asp:TemplateField>
                <asp:TemplateField HeaderText="Title">
                    <ItemTemplate>
                        <%#Eval("Title")%>
                    </ItemTemplate>
                    <FooterTemplate>
                        <asp:TextBox ID="txtAddTitle" runat="Server" BorderStyle="Solid" BorderWidth="1px"
                            Font-Names="Tahoma" Font-Size="11px" BorderColor="Black" />
                    </FooterTemplate>
                    <EditItemTemplate>
                        <asp:TextBox ID="txtEditTitle" Text='<%# Bind("Title") %>' runat="server" BorderStyle="Solid"
                            BorderWidth="1px" Font-Names="Tahoma" Font-Size="11px" BorderColor="Black" />
                    </EditItemTemplate>
                </asp:TemplateField>
                <asp:CommandField ShowEditButton="True" ButtonType="Button" UpdateText="Save" CancelText="Cancel"
                    EditText="Edit" HeaderText="Edit">
                    <FooterStyle BackColor="#669900" HorizontalAlign="Center" />
                    <HeaderStyle BackColor="#5A49A7" HorizontalAlign="Center" />
                    <ItemStyle BackColor="#FFC080" HorizontalAlign="Center" />
                </asp:CommandField>
                <asp:TemplateField HeaderText="Delete">
                    <FooterTemplate>
                        <asp:Button CommandName="Delete" Text="Delete" ID="btnRemove" runat="server" BorderStyle="Solid"
                            BorderWidth="1px" BackColor="#FFC080" Font-Names="Tahoma" Font-Size="11px" />
                    </FooterTemplate>
                    <ItemTemplate>
                        <asp:CheckBox ID="ChkRemove" runat="server"></asp:CheckBox>
                    </ItemTemplate>
                    <ItemStyle BackColor="LightCoral" HorizontalAlign="Center" />
                    <HeaderStyle BackColor="#5A49A7" HorizontalAlign="Center" />
                    <FooterStyle BackColor="#669900" HorizontalAlign="Center" />
                </asp:TemplateField>
            </Columns>
        </asp:GridView>

这个网格的模型是一个组类列表。 组类如下:

public class Group
{
 public int GroupId {get; set; }
 public string Title {get; set; }
}

GroupId 是我的表的主键。 当我按下删除按钮时，出现以下错误:

Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index

我的 RowDeleting 事件处理程序代码:

protected void gvGroups_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
    CheckBox chkRemove;

    List<int> ids = new List<int>();


    foreach (GridViewRow gvRow in gvGroups.Rows)
    {
        chkRemove = (CheckBox)gvRow.FindControl("ChkRemove");
        if (chkRemove.Checked)
        {
            ids.Add(Int32.Parse(gvGroups.DataKeys[gvRow.RowIndex].Value.ToString()));
        }
    }

    if (ids.Any())
    {
        GroupService.DeleteGroupById(ids);
    }

    this.BindGroups();
}

Answer 1

我们可以做的另一项工作是将“删除”按钮的 CommandName 属性更改为“删除”以外的任何内容，并在 RowCommand 事件中处理它， “删除”命令是触发 GridView 控件的 RowDeleting 事件的默认命令名称。