CODEWITHSUNDEEP
c#asp.netwcf
dearn44
dearn44

Reputation: 3432

Cannot access closed stream error when trying to send data from my WCF service

On my service I am trying to create and return a MemoryStream like this:

// Write data.
MemoryStream memoryStream = new MemoryStream();
using (StreamWriter txtwriter = new StreamWriter(memoryStream, System.Text.Encoding.UTF8))
{
    string tempString = "Test";     
    txtwriter.Write(tempString);
    txtwriter.WriteLine();    


    // End response.
    memoryStream.Position = 0L;
    response.ReportMemoryStream = memoryStream;
    response.Length = memoryStream.Length;
    return response;
}

Note: having the End response part outside the using statement causes a Cannot access a closed stream error.

My response is a simple DataContract. When I try to read this data in my client doing something like this:

// Write stream.
if (remoteReport.ReportMemoryStream != null)
{
    remoteReport.ReportMemoryStream.WriteTo(Response.OutputStream);
}

I get again the same error about the stream being closed.

How can I fix this issue and why is my stream closing even though I'm not explicitly doing so?

Upvotes: 1

Views: 601

Answers (2)

Amit Kumar Ghosh
Amit Kumar Ghosh

Reputation: 3726

You'll need to flush your StreamWriter instance, so it writes to the MemoryStream instance -

 txtwriter.Flush();

Then you'll need to remove the using block, so the txtwriter doesn't by default destroyes the memoryStream.

Upvotes: 1

Sebastian 506563
Sebastian 506563

Reputation: 7228

replace:

response.ReportMemoryStream = memoryStream;

with

memoryStream.CopyTo(response.ReportMemoryStream);

now you are using reference type I think, and your using statment is just disposing stream you are using.

Upvotes: 1

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