6

我收到一个错误：

Dialog must be user-initiated

当我从 silverlight 应用程序打开保存文件对话框时，我正在使用以下代码

主按钮点击事件：

 private void btnSaveAttach_Click(object sender, RoutedEventArgs e)
        {
            if (EditableGV.SelectedItems.Count == 1)
            {
                PositionAttachment posAtt = new PositionAttachment();
                posAtt = (PositionAttachment)EditableGV.SelectedItems[0];
                SaveFile(posAtt.File, posAtt.FileName);

            }
            else
            {
                RadWindow.Alert("Please select a attachment from the existing attachments list.", null);
                return;
            }

        }

private void SaveFile(byte[] fileByte, string fileName)
    {
        try
        {
            byte[] fileBytes = fileByte;//your bytes here 

            //Show the dialog        

            SaveFileDialog dialog2 = new SaveFileDialog();
            saveDialog = dialog2.ShowDialog();//This line is giving the error

            if (saveDialog == true)
            {
                //Get the file stream
                dialog2.DefaultFileName = fileName;
                string fileExt = fileName.Substring(fileName.LastIndexOf('.'), fileName.Length);
                dialog2.DefaultExt = "All Files|*.*|" + fileExt + "|*." + fileExt + "";
                using (Stream fs = (Stream)dialog2.OpenFile())
                {
                    fs.Write(fileBytes, 0, fileBytes.Length);
                    fs.Close();

                    //File successfully saved
                }
            }
        }
        catch 
        {
            MessageBox.Show("Error in downloading file");
        }
    }

XMAL 代码：

<StackPanel x:Name="Layout">
    <StackPanel x:Name="Messagepanel" Margin="2" Visibility="Collapsed">
        <TextBlock x:Name="txtMessage" Text="1"  Height="35"></TextBlock>
    </StackPanel>
    <StackPanel Orientation="Horizontal" Margin="4">
        <sdk:Label Height="28" Content="Select File:"   Name="lblSelectFile" Grid.Column="0" Grid.Row="0"  Width="70" />
        <TextBox Name="txtFileName" IsReadOnly="True" HorizontalAlignment="Left" VerticalAlignment="Center"  Width="303" Grid.Column="1" Margin="12,1,0,0"></TextBox>
        <Button Content="Browse" Name="btnBrows" Width="55" Height="22"  HorizontalAlignment="Left" VerticalAlignment="Center" Margin="16,1,0,0" Click="btnBrows_Click" Grid.Column="1" />
    </StackPanel>
    <StackPanel Orientation="Horizontal" Margin="4">
        <sdk:Label Height="28" Content="Description:"   Name="lblFileDescription" Grid.Column="0" Grid.Row="1"  Width="70" />
        <TextBox Height="60"   Name="txtComments" Grid.Column="1" 
         VerticalScrollBarVisibility="Auto" Width="301" Margin="13,0,85,2" Grid.Row="1" />
    </StackPanel>
    <StackPanel Orientation="Horizontal" Margin="4">

        <Button x:Name="OKButton" Content="Add" Click="OKButton_Click" Width="43" Margin="363,6,10,15" Grid.Row="2" Grid.Column="1" HorizontalAlignment="Left" />

        <Button x:Name="CancelButton" Content="Cancel" Click="CancelButton_Click" Width="53" HorizontalAlignment="Right" Margin="0,6,200,15" Grid.Row="2" Grid.Column="1" />
    </StackPanel>
    <StackPanel Orientation="Vertical" Margin="4" Height="224">
        <sdk:Label Content="Existing Attachment(s):" Height="20" Margin="15,7,324,10" Name="lblExistingAttachemnt"  />
        <telerikGrid:RadGridView x:FieldModifier="public" 
                         x:Name="EditableGV" 
                         AutoGenerateColumns="False" 
                         ItemsSource="{Binding PositionAttachemntCollection, Mode=TwoWay}" Margin="0,0,0,7" Height="150">
            <telerik:RadGridView.Columns>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding FileName,Mode=TwoWay}"></telerik:GridViewDataColumn>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding FileDescription,Mode=TwoWay}"></telerik:GridViewDataColumn>
                <!--<telerik:GridViewColumn Header="" >
                    <telerik:GridViewColumn.CellTemplate>
                        <DataTemplate>
                            <telerik:RadButton Name="btnDownlaod" Content="Save" Click="HyperlinkButton_Click"></telerik:RadButton>
                            <<HyperlinkButton Click="HyperlinkButton_Click"  Content="{Binding FileName,Mode=OneWay}" TargetName="_blank" NavigateUri="http://www.google.com" />
                        </DataTemplate>
                    </telerik:GridViewColumn.CellTemplate>
                </telerik:GridViewColumn>-->
            </telerik:RadGridView.Columns>
        </telerikGrid:RadGridView>

        <StackPanel Orientation="Horizontal" Margin="0">
            <!--<Button Content="Save Attachment" Name="btnSaveAttach" Width="112" Margin="263,6,10,15"  Click="btnSaveAttach_Click" />-->
            <Button Content="Close" Name="btnClose" Width="75" Margin="3,6,10,15" Click="btnClose_Click" />
        </StackPanel>

    </StackPanel>
</StackPanel>

此函数调用按钮单击。我想知道我在同一页面上也有一个 openFiledialog，但是成功地打开了对话框而没有任何错误。为什么那个保存文件对话框会导致错误。

以下是错误的堆栈跟踪：

    at System.Windows.Controls.SaveFileDialog.ShowDialogInternal(Window owner)
   at System.Windows.Controls.SaveFileDialog.ShowDialog()
   at IPVWorkbench.Views.AddPositionAttachments.btnSaveAttach_Click(Object sender, RoutedEventArgs e)
   at System.Windows.Controls.Primitives.ButtonBase.OnClick()
   at System.Windows.Controls.Button.OnClick()
   at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
   at System.Windows.Controls.Control.OnMouseLeftButtonUp(Control ctrl, EventArgs e)
   at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName, UInt32 flags)
4

3 回答 3

2

答案在这里给出：http: //social.msdn.microsoft.com/Forums/en-US/lightswitch/thread/8c6529ab-8967-45e8-9e19-920589b060c1

这是一种“安全功能”：

基本上，您必须直接打开 SaveFileDialog 或 OpenFileDialog 以响应由用户操作（例如单击）引起的事件，这些操作仅在主线程上引发。

于 2012-12-02T09:53:03.433 回答
1

您需要在 btnSaveAttach_Click 中显示 SaveFileDialog（这样它是用户启动的）。还要删除所有断点，因为它们也会产生该错误。

试试这个，看看它是否有效，然后基于它构建其余的代码：

private void btnSaveAttach_Click(object sender, RoutedEventArgs e)
{
    SaveFileDialog dialog2 = new SaveFileDialog();
    saveDialog = dialog2.ShowDialog();
}
于 2012-11-27T13:16:29.703 回答
0

我找到了解决方法。我在按钮单击和确认框的“确定”事件上显示了一个确认框，我打开了保存文件对话框，这样它就不会抛出任何异常。

于 2012-12-02T09:14:53.700 回答