/// <summary>
/// Determine if the specified <see cref="TypeRefBase"/> refers to the same generic type, regardless of actual type arguments.
/// </summary>
public override bool IsSameGenericType(TypeRefBase typeRefBase)
{
TypeRefBase typeRef = Type;
return(typeRef != null && typeRef.IsSameGenericType(typeRefBase));
}
/// <summary>
/// Get the parent delegate expression.
/// </summary>
public virtual Expression GetParentDelegateExpression()
{
// Determine the delegate type to which the anonymous method is being assigned
Expression delegateExpression = null;
CodeObject parent = _parent;
while (parent is Conditional || parent is IfNullThen)
{
parent = parent.Parent;
}
if (parent is VariableDecl)
{
// If the anonymous method is being used to initialize a variable, get the delegate type from the variable's type
delegateExpression = ((VariableDecl)parent).Type;
}
else if (parent is Assignment)
{
// If the anonymous method is being assigned to a variable, get the delegate type from the variable's type
delegateExpression = ((Assignment)parent).Left.SkipPrefixes();
}
else if (parent is Cast)
{
// If the anonymous method is being cast, get the delegate type from the cast
delegateExpression = ((Cast)parent).Type;
}
else if (parent is Return)
{
// If the anonymous method is being returned from a method, get the delegate type from the method return type
CodeObject parentMethod = parent.FindParentMethod();
if (parentMethod is MethodDeclBase)
{
delegateExpression = ((MethodDeclBase)parentMethod).ReturnType;
}
else if (parentMethod is AnonymousMethod)
{
// If the anonymous method is being returned from another anonymous method, recursively get the parent
// delegate expression of the parent anonymous method, then get the return type of that delegate.
delegateExpression = ((AnonymousMethod)parentMethod).GetParentDelegateExpression();
if (delegateExpression != null)
{
delegateExpression = delegateExpression.GetDelegateReturnType();
}
}
}
else if (parent is YieldReturn)
{
// If the anonymous method is being returned from an iterator method using 'yield return', get the delegate
// type from the method return type, minus the IEnumerable<> wrapper.
CodeObject parentMethod = parent.FindParentMethod();
if (parentMethod is MethodDeclBase)
{
delegateExpression = ((MethodDeclBase)parentMethod).ReturnType;
TypeRefBase typeRefBase = delegateExpression.SkipPrefixes() as TypeRefBase;
if (typeRefBase != null && typeRefBase.IsSameGenericType(TypeRef.IEnumerable1Ref))
{
delegateExpression = typeRefBase.TypeArguments[0];
}
}
}
else if (parent is Initializer)
{
// Handle collection initializers
if (parent.Parent is Initializer && parent.Parent.Parent is NewObject)
{
TypeRefBase typeRefBase = ((NewObject)parent.Parent.Parent).SkipPrefixes() as TypeRefBase;
// Handle a Dictionary where the value is a delegate type
if (typeRefBase != null && typeRefBase.IsSameGenericType(TypeRef.Dictionary2Ref))
{
delegateExpression = typeRefBase.TypeArguments[1];
}
}
}
return(delegateExpression);
}
