[英]OpenFileDialog.ShowDialog() throws an exception?
I am trying to show a dialog from one of my WPF view model commands however when i call ShowDialog()
it throws a System.ArgumentException
, I was wondering if anyone could give me a hint as to why? 我试图从我的WPF视图模型命令之一显示一个对话框,但是当我调用ShowDialog()
它抛出System.ArgumentException
,我想知道是否有人可以给我提示为什么?
Here is my code: 这是我的代码:
Public ReadOnly Property OpenParser As ICommand
Get
Return New RelayCommand(Sub(param As Object) OpenParserExecute(DirectCast(param, Frame)))
End Get
End Property
Public Sub OpenParserExecute(ByVal mFrame As Frame)
SaveParserExecute()
Dim mOpenDialog As OpenFileDialog = OpenDialog
If mOpenDialog.ShowDialog() Then ' Lines the throws the exception
CurrentParser = New ParserEditorModel(mOpenDialog.FileName)
mFrame.Navigate(New ParserEditor(CurrentParser))
End If
End Sub
StackTrace as requested: 根据要求的StackTrace:
at MS.Internal.Interop.HRESULT.ThrowIfFailed(String message)
at MS.Internal.AppModel.ShellUtil.GetShellItemForPath(String path)
at Microsoft.Win32.FileDialog.PrepareVistaDialog(IFileDialog dialog)
at Microsoft.Win32.FileDialog.RunVistaDialog(IntPtr hwndOwner)
at Microsoft.Win32.FileDialog.RunDialog(IntPtr hwndOwner)
at Microsoft.Win32.CommonDialog.ShowDialog()
at WinTransform.GUI.MainWindowModel.OpenParserExecute(Frame mFrame) in C:\Users\Alex\Desktop\MEDLI\branches\WinTransform\GUI\ViewModels\MainWindowModel.vb:line 38
Because ShowDialog()
itself returns a Nullable(Of Boolean)
and your If
statement is expecting a non-Nullable Boolean
. 因为ShowDialog()
本身返回Nullable(Of Boolean)
并且If
语句期望使用非Nullable Boolean
。
You'll have to cast the dialog's return value to a Boolean
and if it's True
retreive the selected file through your dialog's Filename
property. 您必须将对话框的返回值转换为Boolean
,如果为True
,则可以通过对话框的Filename
属性检索所选文件。
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