Marshal::SizeOf Method (Object^)

.NET Framework (current version)

Returns the unmanaged size of an object in bytes.

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

Syntax

public:
[ComVisibleAttribute(true)]
static int SizeOf(
	Object^ structure
)

Parameters

structure: Type: System::Object^
The object whose size is to be returned.

Return Value

Type: System::Int32

The size of the specified object in unmanaged code.

Exceptions

Exception	Condition
ArgumentNullException	The structure parameter is null.

Remarks

This method accepts an instance of a structure, which can be a reference type or a boxed value type. The layout must be sequential or explicit.

The size returned is the size of the unmanaged object. 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.

You can use the SizeOf method to determine how much unmanaged memory to allocate using the AllocHGlobal and AllocCoTaskMem methods.

The following example creates a managed structure, transfers it to unmanaged memory, and then transfers it back to managed memory. This example uses the SizeOf method to determine how much unmanaged memory to allocate.

C++

No code example is currently available or this language may not be supported.

Version Information

Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1