MemoryMapBug.cs

using System;
using System.Diagnostics;
using System.IO.MemoryMappedFiles;
using System.Runtime.InteropServices;

namespace MemoryMapBug
{
	[StructLayout( LayoutKind.Sequential, Pack = 1 )]
	struct sTest
	{
		public int f1;
		public byte f2;
	}

	static class Program
	{
		const int length = 1024 * 64;

		static void test()
		{
			int cb = Marshal.SizeOf( typeof( sTest ) );
			Debug.Assert( cb == 5 );
			MemoryMappedFile mmf = MemoryMappedFile.CreateNew( null, cb * length );
			var acc = mmf.CreateViewAccessor();
			// Console.WriteLine( "Capacity: {0}", acc.Capacity );

			sTest[] arr = new sTest[ length ];
			for( int i = 0; i < length; i++ )
				arr[ i ] = new sTest() { f1 = i, f2 = (byte)( i & 0xFF ) };

			acc.WriteArray( 0, arr, 0, length );
		}

		static void Main( string[] args )
		{
			try
			{
				test();
				Console.WriteLine( "Completed OK" );
			}
			catch( Exception ex )
			{
				Console.WriteLine( "Crashed: {0}", ex.Message );
			}
		}
	}
}