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Marshal.SizeOf Method (Type)

Note: This API is now obsolete.

Returns the size of an unmanaged type in bytes.

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

[ObsoleteAttribute("SizeOf(Type) may be unavailable in future releases. Instead, use SizeOf<T>(). For more info, go to http://go.microsoft.com/fwlink/?LinkID=296515")]
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: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
Obsolete (compiler warning) in 4.6

.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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