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c# to vb.net conversion error.

Posted on 2013-05-25
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Last Modified: 2013-09-24
Hi!

i found this snippet from  
http://www.codeproject.com/Articles/166763/WCF-Streaming-Upload-Download-Files-Over-HTTP


It works fine when run as it is but when i convert it to vb.net
i get a strange  error saying that wrong parameters or return type
in System.ServiceModel.Channels.Message. it's not allowed to use other parameter types.

but it compiles just fine.

Public Function DownloadFile(request As DownloadRequest) As RemoteFileInfo _
        Implements IService.DownloadFile

        Dim result As New RemoteFileInfo()
        Try
            Dim filePath As String = System.IO.Path.Combine("c:\Uploadfiles", request.FileName)
            Dim fileInfo As New System.IO.FileInfo(filePath)

            ' check if exists
            If Not fileInfo.Exists Then
                Throw New System.IO.FileNotFoundException("File not found", request.FileName)
            End If

            ' open stream
            Dim stream As New System.IO.FileStream(filePath, System.IO.FileMode.Open, System.IO.FileAccess.Read)

            ' return result 
            result.FileName = request.FileName
            result.Length = fileInfo.Length
            result.FileByteStream = stream

        Catch ex As Exception
        End Try
        Return result

    End Function

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Question by:jamppi
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LVL 42

Expert Comment

by:sedgwick
Comment Utility
which line throws the exception?
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Author Comment

by:jamppi
Comment Utility
It doesnt point to any lite.

this is the error

The operation 'ProcessRequestForMessage' could not be loaded because it has a parameter or return type of type System.ServiceModel.Channels.Message or a type that has MessageContractAttribute and other parameters of different types. When using System.ServiceModel.Channels.Message or types with MessageContractAttribute, the method must not use any other types of parameters.

i dont se that i would do it in another way than iin the c# code.
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LVL 42

Expert Comment

by:sedgwick
Comment Utility
this error is usually due to mixing message contracts with other contracts.
did u run it in C# code and it was working fine?
can u post the web.config?
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Author Comment

by:jamppi
Comment Utility
Hi!  

The c# code runs just fine.  

For some strange reason EE wont let me publish the zipped vb.net conversion solution.
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LVL 42

Expert Comment

by:sedgwick
Comment Utility
Change the extension ofthe zip file  to .txt and u would be able to post it here
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Author Comment

by:jamppi
Comment Utility
nope. it wont accept it.
it's on my google drive
https://docs.google.com/file/d/0B9bl-Tcr6AP5N1N1OHlGblF5M00/edit
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LVL 12

Accepted Solution

by:
Jitendra Patil earned 500 total points
Comment Utility
hi jamppi,

I've tested your code you need a small change in your IService.vb

just Modifiy

Public Class DownloadRequest
    <MessageBodyMember()> _
    Public FileName As String
End Class

with

<MessageContract()>
Public Class DownloadRequest
    <MessageBodyMember()> _
    Public FileName As String
End Class


from the above change your service will start functioning.

Hope this helps.
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