Upload a large File to Sharepoint in a Silverlight application

I have tried what seems like about a dozen different methods of uploading files to sharepoint from a silverlight application. They either have severe limitations (file size limits of less than a meg or so) or lots of security issues that I have not been able to over come. 开发者_如何学编程I have tried:

• WCF (We are trying not to use any custom WCF services at all FYI though this is the method that I have gotten to semi work)
• Sharepoint Web services
• Client object model
• HTTP put
• Webclient write stream

I have seen lots of different examples out there of people doing completely different things but none seem to work and all seem like they are the "old" way of doing things. I am using silverlight 4, sharepoint 2010 on IIS 7. Is there a best practice for uploading large (say 20-30 meg) files? I just want to dump a file into a document library.

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I had similar issue. Tweaking web application level setting from central admin, changing asp.net limit in web.confit and following article helped me.

http://blogs.msdn.com/b/sridhara/archive/2010/03/12/uploading-files-using-client-object-model-in-sharepoint-2010.aspx

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Just had a thought silverlight has a thing called an HTML Bridge which allows it to interact with the rest of the page. Consider calling a javascript function from Silverlight, and let the javascript function do the actual upload

UPDATE - the Javascript ClientOM doesn't seem to have the SaveBinaryDirect method :-( How about doing some ExecuteQueryAsync and then in the success call back function (no longer on the UI thread), using the Microsoft.SharePoint.Client version of File? I know this would require downloading the larger assembly, so perhaps that's not so good.

I wonder if there is a way to get the clientOM use a more efficient binding when calling the web services...

Martin

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The default upload size limit for the SharePoint client object model is 2 MB. You can change that limit by modifying the MaxReceivedMessageSize property of the service.

This can be done in two ways:

• programatically - as described in this link - tho this won't work in Silverlight for example

• trough the powershell. On the server where you have SharePoint installed, fire up the SharePoint Management Shell (make sure you run it under the farm administrator account) and run the following commands.

  $ws = [Microsoft.SharePoint.Administration.SPWebService]::ContentService $ws.ClientRequestServiceSettings.MaxReceivedMessageSize = 52428800

  $ws.Update()

This will change the upload limit to 52428800 bytes - or 50 MB. Now, restart the website hosting your SharePoint site (or the entire IIS) for the changes to take effect.