Solved

c# to vb.net conversion error.

Posted on 2013-05-25
7
498 Views
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

Open in new window

0
Comment
Question by:jamppi
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 3
7 Comments
 
LVL 42

Expert Comment

by:sedgwick
ID: 39196858
which line throws the exception?
0
 

Author Comment

by:jamppi
ID: 39197145
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.
0
 
LVL 42

Expert Comment

by:sedgwick
ID: 39197346
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?
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

Author Comment

by:jamppi
ID: 39197932
Hi!  

The c# code runs just fine.  

For some strange reason EE wont let me publish the zipped vb.net conversion solution.
0
 
LVL 42

Expert Comment

by:sedgwick
ID: 39198175
Change the extension ofthe zip file  to .txt and u would be able to post it here
0
 

Author Comment

by:jamppi
ID: 39199262
nope. it wont accept it.
it's on my google drive
https://docs.google.com/file/d/0B9bl-Tcr6AP5N1N1OHlGblF5M00/edit
0
 
LVL 13

Accepted Solution

by:
jitendra patil earned 500 total points
ID: 39204351
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.
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

It’s quite interesting for me as I worked with Excel using vb.net for some time. Here are some topics which I know want to share with others whom this might help. First of all if you are working with Excel then you need to Download the Following …
Creating an analog clock UserControl seems fairly straight forward.  It is, after all, essentially just a circle with several lines in it!  Two common approaches for rendering an analog clock typically involve either manually calculating points with…
Come and listen to Percona CEO Peter Zaitsev discuss what’s new in Percona open source software, including Percona Server for MySQL (https://www.percona.com/software/mysql-database/percona-server) and MongoDB (https://www.percona.com/software/mongo-…
Monitoring a network: why having a policy is the best policy? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the enormous benefits of having a policy-based approach when monitoring medium and large networks. Software utilized in this v…

719 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question