OpenFileDialog throws exception when lots of files are selected

09-15-2009 9:38 AM |

Hello,

I have a Silverlight control hosted in an asp.net web application, that calls the following code when a button is clicked:

OpenFileDialog ofd = new OpenFileDialog();
ofd.Multiselect = true;

if (ofd.ShowDialog() == true)
{  ..... }

 When I select a large number of files (800+) the ShowDialog() mehtod throws the following exception:

  {System.InvalidOperationException: ShowDialog failed.
   at System.Windows.Controls.OpenFileDialog.ShowDialog()
   at mpost.SilverlightMultiFileUpload.Page.SelectUserFiles()
   at mpost.SilverlightMultiFileUpload.Page.SelectFilesButton_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, String eventName)}

Does anyone know how can I make it possible to open so many files?

From what I could find on the internet, there is some buffer that has to be set higher, but I could not find what is the exact setting in Web.config I have to modify.

 Thanks,

 Gicanu

Re: OpenFileDialog throws exception when lots of files are selected

09-15-2009 9:41 AM |

Just out of curiousity, what is your use-case scenario for needing to open so many files at one time?

Re: OpenFileDialog throws exception when lots of files are selected

09-15-2009 10:07 AM |

I just tried with 2210 files from System32 folder. it's working fine.

XAML

<UserControl x:Class="SilverlightApplication1.MainPage"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480">

<Button Content="Click Me" Click="Button_Click"></Button>

</UserControl>

C#

ofd.Multiselect = true;

Re: Re: OpenFileDialog throws exception when lots of files are selected

09-16-2009 9:39 AM |

I have no problem in satisfying your curiosity. The Silverlight control is part of an app that submits all this files to a printing server which has no problem in dealing with thousands of files.

Re: OpenFileDialog throws exception when lots of files are selected

09-16-2009 9:41 AM |

 Thanks for the answer.

Can you tell me please what version of Silverlight and what browser you used?

Thanks

Re: OpenFileDialog throws exception when lots of files are selected

09-16-2009 6:19 PM |

btw. web.config got nothing to do with silverlight.