[CodeGen] How do I return an enumerated type?

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I want to create a code generation routine to create a return statement that returns a particular enumerated type e.g.

VB

Return EvaluationResult.Include

What I have so far is...

VB.NET

Private Shared Function ToReturnStatement(ByVal valueToReturn As IdentityGroupClassification) As CodeStatement

    Dim expression As CodeExpression = Nothing
    If (valueToReturn = IdentityGroupClassification.Exclude) Then
        'EvaluationResult.Exclude

    ElseIf (valueToReturn = IdentityGroupClassification.Include) Then
        'EvaluationResult.Include

    Else
        'EvaluationResult.Unchanged

    End If
    If (expression IsNot Nothing) Then
        Return New CodeMethodReturnStatement(expression)
    Else
        Return New CodeMethodReturnStatement()
    End If


End Function

What do I need to set "expression" to in order to return an enumerated type?

Posted 25-Dec-15 11:55am

Duncan Edwards Jones

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Alan N · Accepted Answer · 2015-12-25T13:38:00

Isn't this stuff so damned awkward! You will need a CodeTypeReferenceExpression to get the enum type and a CodeFieldReferenceExpression to get a value.

For example (in C#, sorry about that)

C#

private CodeMemberMethod CreateGetEnumMethod() {
  // To create the following method
  // public System.DayOfWeek GetDay() {
  //   return System.DayOfWeek.Saturday;
  // }

  CodeMemberMethod method = new CodeMemberMethod();
  method.Attributes = MemberAttributes.Public | MemberAttributes.Final;
  method.Name = "GetDay";
  method.ReturnType = new CodeTypeReference(typeof(DayOfWeek));

  CodeTypeReferenceExpression enumType = new CodeTypeReferenceExpression(typeof(DayOfWeek));
  CodeFieldReferenceExpression enumValue = new CodeFieldReferenceExpression(enumType, "Saturday");
  method.Statements.Add(new CodeMethodReturnStatement(enumValue));
  return method;
}

Alan.