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    <p>I do not believe .NET provides this, but it should be fairly easy to implement your own implementation of <code>System.IO.Stream</code>, that seamlessly switches backing array. Here are the (untested) basics:</p> <pre><code>public class MultiArrayMemoryStream: System.IO.Stream { byte[][] _arrays; long _position; int _arrayNumber; int _posInArray; public MultiArrayMemoryStream(byte[][] arrays){ _arrays = arrays; _position = 0; _arrayNumber = 0; _posInArray = 0; } public override int Read(byte[] buffer, int offset, int count){ int read = 0; while(read&lt;count){ if(_arrayNumber&gt;=_arrays.Length){ return read; } if(count-read &lt;= _arrays[_arrayNumber].Length - _posInArray){ Buffer.BlockCopy(_arrays[_arrayNumber], _posInArray, buffer, offset+read, count-read); _posInArray+=count-read; _position+=count-read; read=count; }else{ Buffer.BlockCopy(_arrays[_arrayNumber], _posInArray, buffer, offset+read, _arrays[_arrayNumber].Length - _posInArray); read+=_arrays[_arrayNumber].Length - _posInArray; _position+=_arrays[_arrayNumber].Length - _posInArray; _arrayNumber++; _posInArray=0; } } return count; } public override long Length{ get { long res = 0; for(int i=0;i&lt;_arrays.Length;i++){ res+=_arrays[i].Length; } return res; } } public override long Position{ get { return _position; } set { throw new NotSupportedException(); } } public override bool CanRead{ get { return true; } } public override bool CanSeek{ get { return false; } } public override bool CanWrite{ get { return false; } } public override void Flush(){ } public override void Seek(long offset, SeekOrigin origin){ throw new NotSupportedException(); } public override void SetLength(long value){ throw new NotSupportedException(); } public override void Write(byte[] buffer, int offset, int count){ throw new NotSupportedException(); } } </code></pre> <p>Another way to workaround the size-limitation of 2^31 bytes is <a href="http://msdn.microsoft.com/en-us/library/13e02eft.aspx" rel="nofollow noreferrer"><code>UnmanagedMemoryStream</code></a> which implements <code>System.IO.Stream</code> on top of an unmanaged memory buffer (which might be as large as the OS supports). Something like this might work (untested):</p> <pre><code>var fileStream = new FileStream("data", FileMode.Open, FileAccess.Read, FileShare.Read, 16 * 1024, FileOptions.SequentialScan); long length = fileStream.Length; IntPtr buffer = Marshal.AllocHGlobal(new IntPtr(length)); var memoryStream = new UnmanagedMemoryStream((byte*) buffer.ToPointer(), length, length, FileAccess.ReadWrite); fileStream.CopyTo(memoryStream); memoryStream.Seek(0, SeekOrigin.Begin); // work with the UnmanagedMemoryStream Marshal.FreeHGlobal(buffer); </code></pre>
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    1. POCan as 2D byte array be made one huge continuous byte array?
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    1. USRasmus Faber
    1. USRasmus Faber
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    1. VO
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      1. VTUpMod
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    1. CORasmus - I hadn't heard of that - I will look it up - thank you
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      1. USManInMoon
    2. CORasmus - that looks interesting.
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      1. USManInMoon
    3. COCould you guide me as to how best to load a bytestream from disk into UnmanagedMemoryStream in the example?
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      1. USManInMoon
 

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