/// <summary>
/// Creates a new <see cref="CodeTypeDeclaration"/> that is the generated form of
/// the given <paramref name="enumType"/>.
/// </summary>
/// <param name="enumType">The enum type to generate.</param>
/// <param name="codeGenerator">The current proxy generator context.</param>
/// <returns>The newly generated enum type declaration.</returns>
internal static CodeTypeDeclaration CreateEnumTypeDeclaration(Type enumType, CodeDomClientCodeGenerator codeGenerator)
{
System.Diagnostics.Debug.Assert(enumType.IsEnum, "Type must be an enum type");
CodeTypeDeclaration typeDecl = CodeGenUtilities.CreateTypeDeclaration(enumType);
typeDecl.IsEnum = true;
// Always force generated enums to be public
typeDecl.TypeAttributes |= TypeAttributes.Public;
// Enums deriving from anything but int get an explicit base type
Type underlyingType = enumType.GetEnumUnderlyingType();
if (underlyingType != typeof(int))
{
typeDecl.BaseTypes.Add(new CodeTypeReference(underlyingType));
}
// Generate [DataContract] if it appears in the original only. Use Reflection only because that matches
// what WCF will do.
DataContractAttribute dataContractAttr = (DataContractAttribute)Attribute.GetCustomAttribute(enumType, typeof(DataContractAttribute));
if (dataContractAttr != null)
{
CodeAttributeDeclaration attrDecl = CodeGenUtilities.CreateDataContractAttributeDeclaration(enumType, codeGenerator, typeDecl);
typeDecl.CustomAttributes.Add(attrDecl);
}
string[] memberNames = Enum.GetNames(enumType);
Type enumValueType = Enum.GetUnderlyingType(enumType);
for (int i = 0; i < memberNames.Length; ++i)
{
string memberName = memberNames[i];
CodeTypeReference enumTypeRef = CodeGenUtilities.GetTypeReference(enumValueType, codeGenerator, typeDecl);
CodeMemberField enumMember = new CodeMemberField(enumTypeRef, memberName);
// Generate an initializer for the enum member.
// GetRawConstantValue is the safest way to get the raw value of the enum field
// and works for both Reflection and ReflectionOnly loaded assemblies.
FieldInfo fieldInfo = enumType.GetField(memberName);
if (fieldInfo != null)
{
object memberValue = fieldInfo.GetRawConstantValue();
Debug.Assert(memberValue != null, "Enum type's GetRawConstantValue should never return null");
// We special-case MinValue and MaxValue for the integral types
// because VisualBasic will generate overflow compiler error for
// Int64.MinValue. If we detect a known MinValue or MaxValue for
// this integral type, we generate that reference, otherwise we
// just generate a constant integral value of the enum's type
object[] minMaxValues = null;
CodeGenUtilities.IntegralMinMaxValues.TryGetValue(underlyingType, out minMaxValues);
Debug.Assert(minMaxValues == null || minMaxValues.Length == 3, "integralMinMaxValues elements must always contain 3 values");
// Gen xxx.MinValue if it matches, but give precedence to matching a true zero,
// which is the min value for the unsigned integral types
// minMaxValues[0]: the MinValue for this type
// minMaxValues[1]: the MaxValue for this type
// minMaxValues[2]: the zero for this type (memberValue is not boxed and cannot be cast)
if (minMaxValues != null && !memberValue.Equals(minMaxValues[2]) && memberValue.Equals(minMaxValues[0]))
{
enumMember.InitExpression = new CodeFieldReferenceExpression(new CodeTypeReferenceExpression(underlyingType), "MinValue");
}
// Gen xxx.MaxValue if it matches
else if (minMaxValues != null && memberValue.Equals(minMaxValues[1]))
{
enumMember.InitExpression = new CodeFieldReferenceExpression(new CodeTypeReferenceExpression(underlyingType), "MaxValue");
}
// All other cases generate an integral constant.
// CodeDom knows how to generate the right integral constant based on memberValue's type.
else
{
enumMember.InitExpression = new CodePrimitiveExpression(memberValue);
}
}
typeDecl.Members.Add(enumMember);
// Generate an [EnumMember] if appropriate
EnumMemberAttribute enumMemberAttr = (EnumMemberAttribute)Attribute.GetCustomAttribute(fieldInfo, typeof(EnumMemberAttribute));
if (enumMemberAttr != null)
{
CodeAttributeDeclaration enumAttrDecl = CodeGenUtilities.CreateEnumMemberAttributeDeclaration(fieldInfo, codeGenerator, typeDecl);
enumMember.CustomAttributes.Add(enumAttrDecl);
}
// Propagate any other attributes that can be seen by the client
CustomAttributeGenerator.GenerateCustomAttributes(
codeGenerator,
typeDecl,
ex => string.Format(CultureInfo.CurrentCulture, Resource.ClientCodeGen_Attribute_ThrewException_CodeTypeMember, ex.Message, fieldInfo.Name, typeDecl.Name, ex.InnerException.Message),
fieldInfo.GetCustomAttributes(false).Cast <Attribute>().Where(a => a.GetType() != typeof(EnumMemberAttribute)),
enumMember.CustomAttributes,
enumMember.Comments);
}
// Attributes marked with [Flag] propagate it
if (enumType.GetCustomAttributes(typeof(FlagsAttribute), false).Length > 0)
{
CodeAttributeDeclaration attrDecl = CodeGenUtilities.CreateAttributeDeclaration(typeof(FlagsAttribute), codeGenerator, typeDecl);
typeDecl.CustomAttributes.Add(attrDecl);
}
return(typeDecl);
}
/// <summary>
/// Gets a <see cref="CodeTypeReference"/> for a CLR type.
/// </summary>
/// <param name="type">A CLR type.</param>
/// <param name="codeGenerator">A <see cref="CodeDomClientCodeGenerator"/>.</param>
/// <param name="referencingType">The referencing type.</param>
/// <param name="optimizeAttributeName">Indicates whether or not to optimize <see cref="Attribute"/> names by removing the "Attribute" suffix.</param>
/// <param name="forceUseFullyQualifiedName">Indicates whether or not to generate the type using the fully qualified name irrespective the global setting.</param>
/// <returns>A <see cref="CodeTypeReference"/> for a CLR type.</returns>
internal static CodeTypeReference GetTypeReference(Type type, CodeDomClientCodeGenerator codeGenerator, CodeTypeDeclaration referencingType, bool optimizeAttributeName, bool forceUseFullyQualifiedName)
{
string typeName = type.Name;
string typeNamespace = type.Namespace;
// Add an import statement to the referencing type if needed
CodeNamespace ns = codeGenerator.GetNamespace(referencingType);
CodeTypeReference codeTypeReference = null;
// Attribute? If so, we special case these and remove the 'Attribute' suffix if present.
if (optimizeAttributeName)
{
typeName = OptimizeAttributeName(type);
}
// Determine if we should generate this type with a full type name
bool useFullyQualifiedName = forceUseFullyQualifiedName || CodeGenUtilities._useFullTypeNames || RegisterTypeName(typeNamespace, typeName, ns.Name);
// Make sure we take into account root namespace in VB codegen.
typeNamespace = TranslateNamespace(type, codeGenerator);
// Conditionally add an import statement. Skip this step if we need to generate a full
// type name, if we're already in the target namespace, or if the type is in the global namespace.
if (!useFullyQualifiedName && !ns.Name.Equals(type.Namespace) && !string.IsNullOrEmpty(type.Namespace))
{
// If the namespace is already imported, the following line will be a no-op.
ns.Imports.Add(new CodeNamespaceImport(typeNamespace));
}
// If forced using Fully Qualified names, dont look up or store the code reference in the cache. That is because,
// we force the use of fully qualified names only in certain cases. Caching at this time will cause the fully qualified name
// to be used every time.
bool useCache = !forceUseFullyQualifiedName;
// See if we already have a reference for this type
Tuple <CodeNamespace, Type> tupleKey = new Tuple <CodeNamespace, Type>(ns, type);
if (!useCache || !CodeGenUtilities._codeTypeReferences.TryGetValue(tupleKey, out codeTypeReference))
{
if (useFullyQualifiedName && !string.IsNullOrEmpty(typeNamespace))
{
// While this splicing may seem awkward, we perform this task
// rather than rely on 'type.FullName' as we may have performed
// a VB root namespace translation task above.
typeName = typeNamespace + "." + typeName;
}
// If not, create a new type reference. Use the constructor for CodeTypeReference
// that takes a type's name rather than type to generate short names.
if (type.IsArray)
{
codeTypeReference = new CodeTypeReference(
CodeGenUtilities.GetTypeReference(type.GetElementType(), codeGenerator, referencingType, /* optimizeAttributeName */ false, forceUseFullyQualifiedName),
type.GetArrayRank());
}
else if (type.IsGenericType)
{
Type[] genericArguments = type.GetGenericArguments();
CodeTypeReference[] typeArguments = new CodeTypeReference[genericArguments.Length];
for (int i = 0; i < genericArguments.Length; i++)
{
typeArguments[i] = GetTypeReference(genericArguments[i], codeGenerator, referencingType);
}
codeTypeReference = new CodeTypeReference(typeName, typeArguments);
}
else
{
// Generate language-specific shorthands for core types by using CodeTypeReference constructor that takes a Type
if (type.IsPrimitive || type == typeof(void) || type == typeof(decimal) || type == typeof(string) || type == typeof(object))
{
codeTypeReference = new CodeTypeReference(type);
}
else
{
codeTypeReference = new CodeTypeReference(typeName);
}
}
// Keep track of the CLR type for identification purposes.
codeTypeReference.UserData["ClrType"] = type;
// Cache for later use.
if (useCache)
{
CodeGenUtilities._codeTypeReferences.Add(tupleKey, codeTypeReference);
}
}
return(codeTypeReference);
}