我收到错误：
Dialog must be user-initiated
当我从Silverlight应用程序打开savefile对话框时，我正在使用下面的代码
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>
此功能调用单击按钮。我想知道我在同一页面上有一个openFiledialog但是成功打开了对话框而没有任何错误。为什么savefile对话框导致错误。
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)
答案 0 :(得分：2)
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Click）引起的事件，该事件仅在主线程上引发。
答案 1 :(得分：1)
您需要在btnSaveAttach_Click中显示SaveFileDialog（这是用户启动的方式）。另外remove all your breakpoints因为它们也会产生错误。
试试这个并查看它是否有效，然后根据它构建其余的代码：
private void btnSaveAttach_Click(object sender, RoutedEventArgs e)
{
SaveFileDialog dialog2 = new SaveFileDialog();
saveDialog = dialog2.ShowDialog();
}
答案 2 :(得分：0)
我找到了解决方法。我已经在按钮上单击了确认框并在确认框中显示“确定”事件我打开了保存文件对话框，这样就不会抛出任何异常。