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MethodBuilder.SetReturnType Method

Sets the return type of the method.

Namespace:  System.Reflection.Emit
Assembly:  mscorlib (in mscorlib.dll)
public void SetReturnType(
	Type returnType
)

Parameters

returnType
Type: System.Type

A Type object that represents the return type of the method.

ExceptionCondition
InvalidOperationException

The current method is generic, but is not a generic method definition. That is, the IsGenericMethod property is true, but the IsGenericMethodDefinition property is false.

Use this method to set the return type of a generic method, when the return type is specified by one of the generic type parameters of the method. If the return type has optional or required custom modifiers, such as IsConst, use the SetSignature(Type, Type[], Type[], Type[], Type[][], Type[][]) method overload.

Calling this method replaces a return type established using the TypeBuilder.DefineMethod method.

The following code example uses the DefineGenericParameters method to make a method generic. The SetParameters method is used to give the method one parameter, whose type will be specified by the first generic type parameter. The SetReturnType method is used to give the method a return type, specified by the second generic type parameter.

This code is part of a larger example provided for the DefineGenericParameters method.

// Defining generic parameters for the method makes it a 
// generic method. By convention, type parameters are  
// single alphabetic characters. T and U are used here. 
// 
string[] typeParamNames = {"T", "U"};
GenericTypeParameterBuilder[] typeParameters = 
    demoMethod.DefineGenericParameters(typeParamNames);

// The second type parameter is constrained to be a  
// reference type.
typeParameters[1].SetGenericParameterAttributes( 
    GenericParameterAttributes.ReferenceTypeConstraint);


...


// Set parameter types for the method. The method takes 
// one parameter, and its type is specified by the first 
// type parameter, T.
Type[] parms = {typeParameters[0]};
demoMethod.SetParameters(parms);

// Set the return type for the method. The return type is 
// specified by the second type parameter, U.
demoMethod.SetReturnType(typeParameters[1]);

.NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.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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