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ModuleBuilder.DefineUninitializedData Method

Defines an uninitialized data field in the .sdata section of the portable executable (PE) file.

Namespace:  System.Reflection.Emit
Assembly:  mscorlib (in mscorlib.dll)

public FieldBuilder DefineUninitializedData(
	string name,
	int size,
	FieldAttributes attributes


Type: System.String

The name used to refer to the data. name cannot contain embedded nulls.

Type: System.Int32

The size of the data field.

Type: System.Reflection.FieldAttributes

The attributes for the field.

Return Value

Type: System.Reflection.Emit.FieldBuilder
A field to reference the data.


The length of name is zero.


size is less than or equal to zero or greater than or equal to 0x003f0000.


name is null.


CreateGlobalFunctions has been previously called.

Static is automatically included in attributes.

The data defined by this method is not created until the CreateGlobalFunctions method is called.


Starting with the .NET Framework version 2.0 Service Pack 1, this member no longer requires ReflectionPermission with the ReflectionPermissionFlag.ReflectionEmit flag. (See Security Issues in Reflection Emit.) To use this functionality, your application should target the .NET Framework version 3.5. For more information, see .NET Framework 3.5 Architecture.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0