Exception of type 'System.OutOfMemoryException' was thrown. C# when using Memory stream

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am working with wpf application and memory stream write method is used in that to write dicom data bytes.It shows the Exception of type 'System.OutOfMemoryException' when try to write big dicom data having size more than 70 mb. Can you please suggest any solution to resolve this.
The piece of code is like this

C#

try 
{ 
using ( MemoryStream imagememoryStream = new MemoryStream())
 {
 while (true) 
{ 
// Retrieve the DICOMData. 
// data comes as chunks; if file size is larger, multiple RetrieveDICOMData() calls 
// has to be raised. the return value specifies whether the chunk is last one or not.
dicomData = dicomService.RetrieveDICOMData( hierarchyInfo ); 
imagememoryStream.Write( dicomData.DataBytes, 0, dicomData.DataBytes.Length );
if (dicomData.IsLastChunk) 
{ 
// data is smaller; 
//completed reading so, end 
break;
 }
 } 
imageData=imagememoryStream.ToArray(); 
} 
return imageData;
 } 
catch( Exception exception )
 { 
throw new DataException( exception.StackTrace );
 }

Thanks in advance.
Yours faithfully Sajitha

Posted 7-Aug-13 18:44pm

Kochupennu

Updated 7-Aug-13 18:46pm

Thanks7872

v2

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Kuthuparakkal · Answer 1 · 2013-08-07T19:46:00

Solution 1

Flush memory stream before using it...

C#

imagememoryStream.Flush();
imagememoryStream.Position = 0;

Posted 7-Aug-13 19:46pm

Kuthuparakkal

Raman Midha · Answer 2 · 2013-08-07T20:48:00

Solution 2

Write data in small packages or small bunches . this would not give the exception

Posted 7-Aug-13 20:48pm

Raman Midha

Raman Midha · Answer 3 · 2013-08-07T20:55:00

C#

int localBufferSize = 4 * 1024;   // 4 KB
              byte[] obuffer = new byte[localBufferSize];
              while (true)
              {
                  int size = fileStream.Read(obuffer, 0, localBufferSize);
                  if (size > 0)
                  {
                      MemoryStream.Write(obuffer, 0, size);
                  }
                  else
                  {
                      break;
                  }
              }

I have used this code in my application. Hope it helps you.