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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)
member DefineField : 
        fieldName:string * 
        type:Type * 
        attributes:FieldAttributes -> FieldBuilder


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 a null reference (Nothing in Visual Basic).


The type was previously created using CreateType.

.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

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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