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MSDN Library

MarshalAsAttribute.SizeConst Field

Indicates the number of elements in the fixed-length array or the number of characters (not bytes) in a string to import.

Namespace:  System.Runtime.InteropServices
Assemblies:   mscorlib (in mscorlib.dll)
  System.Runtime.InteropServices (in System.Runtime.InteropServices.dll)

public int SizeConst

This field is required for the ByValArray and ByValTStr members of the System.Runtime.InteropServices.UnmanagedType enumeration. Because the compressed format of the metadata is limited to 0x1FFFFFFF, the range of allowed values for SizeConst are (>= 0 and <= 0x1FFFFFFF).

For additional information, see Default Marshaling for Arrays.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
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