Gridview CommandField 验证有效，但不触发 Delete 方法答案

【问题标题】：Gridview CommandField validation works, but not firing Delete methodGridview CommandField 验证有效，但不触发 Delete 方法
【发布时间】：2012-01-03 02:18:28
【问题描述】：

我有一个网格视图，我正试图从后面的代码中进行验证。在这种情况下，确认记录删除。我的删除方法工作正常，直到我添加验证，当我实现它时，它不会触发删除。

需要明确的是，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

【问题讨论】：

不是很清楚问题是什么。当您说“它不会触发删除”时，是否会发生错误？ RowDeleting 或 RowDataBound 事件不会触发吗？
不，没有发生错误。如果我遗漏了我在 RowDataBound 中使用的验证，则会按预期进行删除。如果我把这个方法留在里面，什么都不会发生。没有错误，但不会发生删除。

标签： asp.net validation gridview rowdatabound rowdeleting

【解决方案1】：

您可以使用以下代码（我希望您对 C# 的了解足以将其转换为 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并且根本没有发生回发。

【讨论】：