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POMemoryStream data corruption issue
 

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  1. POMemoryStream data corruption issue
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    <p>I have created a simple REST based WCF service which runs on BasicHttpBinding. In one of my webmethod, I am returning a Stream which points to a JSON response. </p> <p>The Method looks like : </p> <pre><code>[OperationContract] [FaultContract(typeof(ApplicationFault))] [WebInvoke(Method = "POST", UriTemplate = "GetActiveCalls/{nurseid}")] Stream GetActiveCalls(string nurseid); </code></pre> <p>From the body of the GetActiveCalls, I am creating an object of MemoryStream and returning the same as response. The code looks like </p> <pre><code>// Serialize the results as JSON string jsonResult = new JavaScriptSerializer().Serialize(baseResponses); // ContentType json WebOperationContext.Current.OutgoingResponse.ContentType = "application/json"; WebOperationContext.Current.OutgoingResponse.Headers.Add("Cache-Control", "no-cache"); var bytes = Encoding.UTF8.GetBytes(jsonResult); //Parse to memorystream var ms = new MemoryStream(bytes); ms.Seek(0, SeekOrigin.Begin); ms.SetLength(bytes.LongLength); return ms; </code></pre> <p>When trying this from client, I get result like</p> <pre><code>{"LastEvents":[{"FormatValues":"Klic 2 3 4","Icon":null,"Color":"Red","Acknowledged":false,"EventID":28566}],"Message":"","Status":true} </code></pre> <p>But sometimes after invoking the same method for multiple times, I start getting the response as : </p> <pre><code>{"LastEvents":[{"FormatValues":"Klic 2 3 4","Icon":null,"Color":"Red","Acknowledged":false,"EventID":28566}],"Message":"","Statu{"LastEv </code></pre> <p>You can see after "Statu on the JSON response, the stream gets reset and starts getting data from the beginning. </p> <p>It looks strange to me. Can someone point to if I am missing something. </p> <p>*From server side, when I put breakpoint, it seems the MemoryStream has correct response.</p>
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    1. USJohn Saunders
    1. USabhishek
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    1. COCurious, is there a reason you're manually serializing this? If all you're doing is passing back a `MemoryStream`, then you aren't saving much, as you have to materialize the full result set before you send it off. If you're sending back JSON, you generally don't need it.
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      1. UScasperOne
    2. COHmm. you mean I dont need to Serilize the object, and rather write the object directly ?
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      1. USabhishek
    3. COYes, why not just make the return value your object and let WCF handle the serialization over the wire?
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      1. UScasperOne
 

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