Gridview验证有效，但不触发CommandField方法

Question

我有一个网格视图，我正在试着从代码背后验证它。在这种情况下，确认删除记录。我的删除方法工作得很好，直到我添加了验证，当我实现它时，它不会触发删除。

为了清楚起见，在我添加RowDataBound验证之前，删除方法可以正常工作。

<asp:CommandField 
        ButtonType="Image"
        ShowEditButton="true" 
        ShowDeleteButton="true" 
        ShowCancelButton="true"
        EditImageUrl="~/Images/edit-icon.gif" 
        UpdateImageUrl="~/Images/save-icon.png"
        CancelImageUrl="~/Images/cancel-icon.png" 
        DeleteImageUrl="~/Images/delete-icon.png" 
        />

以下是相关的方法。

Protected Sub usersGrid_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
For Each control As Control In e.Row.Cells(0).Controls
        Dim DeleteButton As ImageButton = TryCast(control, ImageButton)
        If DeleteButton IsNot Nothing AndAlso DeleteButton.CommandName = "Delete" Then
            DeleteButton.OnClientClick = "return(confirm('Are you sure you want to delete this user?\nThis cannot be undone!'))"
        End If
    Next
End Sub

Protected Sub usersGrid_RowDeleting(ByVal sender As Object, ByVal e As GridViewDeleteEventArgs)
    Dim userID As Integer = DirectCast(usersGrid.DataKeys(e.RowIndex).Value, Integer)

    usersGrid_Delete(userID)
    BindData()
End Sub

Protected Sub usersGrid_Delete(ByVal userID As Integer)
    Dim con As New SqlConnection(connectionString)
    Dim cmd As New SqlCommand("MAINT_DIST_DELETE_USER", con)
    cmd.CommandType = CommandType.StoredProcedure
    cmd.Parameters.AddWithValue("@userID", userID)

    Try
        con.Open()
        cmd.ExecuteNonQuery()
    Catch Ex As Exception
        Throw Ex
    Finally
        con.Close()
    End Try
End Sub

Answer 1

您可以使用以下代码(我希望您了解足够多的C#以将其转换为VB.NET)：

void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        var deleteButton = e.Row.Cells[0].Controls.OfType<ImageButton>().FirstOrDefault(btn => btn.CommandName == "Delete");
        if (deleteButton != null)
        {
            deleteButton.OnClientClick =
                string.Format("javascript:if(confirm('Are you sure you want to delete this user? This cannot be undone!')){{ __doPostBack('{0}', 'Delete${1}');}} return false;", GridView1.UniqueID, e.Row.RowIndex);
        }
    }
}

原因是ImageButton控件使用onclick属性来触发回发，而您的代码完全删除了它的默认值，因此根本不会发生回发。