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Marshal.SizeOf Method (Type)

Returns the size of an unmanaged type in bytes.

Namespace:  System.Runtime.InteropServices
Assembly:  mscorlib (in mscorlib.dll)
public static int SizeOf(
	Type t
)

Parameters

t
Type: System.Type

The type whose size is to be returned.

Return Value

Type: System.Int32
The size of the specified type in unmanaged code.
ExceptionCondition
ArgumentException

The t parameter is a generic type.

ArgumentNullException

The t parameter is null.

You can use this method when you do not have a structure. The layout must be sequential or explicit.

The size returned is the size of the unmanaged type. The unmanaged and managed sizes of an object can differ. For character types, the size is affected by the CharSet value applied to that class.

The following example demonstrates calling the SizeOf method. This code example is part of a larger example provided for the Marshal class.

// Demonstrate the use of the SizeOf method of the Marshal class.
Console.WriteLine("Number of bytes needed by a Point object: {0}", 
    Marshal.SizeOf(typeof(Point)));
Point p = new Point();
Console.WriteLine("Number of bytes needed by a Point object: {0}",
    Marshal.SizeOf(p));

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

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

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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