asp.net - この例外が発生した理由:Sys.WebForms.PageRequestManagerServerErrorException:無効なポストバックまたはコールバック引数

Question

このエラーが発生した理由

Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerServerErrorException: Invalid postback or callback argument.  Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page.  For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them.  If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.

このエラーは、保存コマンドのイベントが開始されたときに表示されます

  Protected Sub DataList1_ItemCommand(source As Object, e As System.Web.UI.WebControls.DataListCommandEventArgs) Handles dlMainTraing.ItemCommand
        If e.CommandName = "Save" Then
            Dim lblMainId = CType(dlMainTraing.Items(e.Item.ItemIndex).FindControl("Train_M_IndxLabel"), Label)
            Dim txtSubTrainingName2 = CType(dlMainTraing.Items(e.Item.ItemIndex).FindControl("txtSubTrainingName"), TextBox)
            Dim a = addSubTraining(CInt(lblMainId.Text), txtSubTrainingName2.Text)
            ' Dim gvSubTraning As GridView = CType(e.Item.FindControl("gvSubTraning"), GridView)
            'gvSubTraning.DataBind()
        End If

    End Sub

Answer 1

.aspx ページの上部で、EnableEventValidation を false に設定します。