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TypeBuilder.DefineField Method (String, Type, FieldAttributes)

Adds a new field to the type, with the given name, attributes, and field type.

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

public FieldBuilder DefineField(
	string fieldName,
	Type type,
	FieldAttributes attributes


Type: System.String

The name of the field. fieldName cannot contain embedded nulls.

Type: System.Type

The type of the field

Type: System.Reflection.FieldAttributes

The attributes of the field.

Return Value

Type: System.Reflection.Emit.FieldBuilder
The defined field.


The length of fieldName is zero.


type is System.Void.


A total size was specified for the parent class of this field.


fieldName is null.


The type was previously created using CreateType.

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