protected override Expression DoResolve (ResolveContext ec)
{
constructor_method = Delegate.GetConstructor (type);
var invoke_method = Delegate.GetInvokeMethod (type);
Arguments arguments = CreateDelegateMethodArguments (ec, invoke_method.Parameters, invoke_method.Parameters.Types, loc);
method_group = method_group.OverloadResolve (ec, ref arguments, this, OverloadResolver.Restrictions.CovariantDelegate);
if (method_group == null)
return null;
var delegate_method = method_group.BestCandidate;
if (delegate_method.DeclaringType.IsNullableType) {
ec.Report.Error (1728, loc, "Cannot create delegate from method `{0}' because it is a member of System.Nullable<T> type",
delegate_method.GetSignatureForError ());
return null;
}
if (!AllowSpecialMethodsInvocation)
Invocation.IsSpecialMethodInvocation (ec, delegate_method, loc);
ExtensionMethodGroupExpr emg = method_group as ExtensionMethodGroupExpr;
if (emg != null) {
method_group.InstanceExpression = emg.ExtensionExpression;
TypeSpec e_type = emg.ExtensionExpression.Type;
if (TypeSpec.IsValueType (e_type)) {
ec.Report.Error (1113, loc, "Extension method `{0}' of value type `{1}' cannot be used to create delegates",
delegate_method.GetSignatureForError (), e_type.GetSignatureForError ());
}
}
TypeSpec rt = delegate_method.ReturnType;
if (rt.BuiltinType == BuiltinTypeSpec.Type.Dynamic)
rt = ec.BuiltinTypes.Object;
if (!Delegate.IsTypeCovariant (ec, rt, invoke_method.ReturnType)) {
Expression ret_expr = new TypeExpression (delegate_method.ReturnType, loc);
Error_ConversionFailed (ec, delegate_method, ret_expr);
}
if (delegate_method.IsConditionallyExcluded (ec, loc)) {
ec.Report.SymbolRelatedToPreviousError (delegate_method);
MethodOrOperator m = delegate_method.MemberDefinition as MethodOrOperator;
if (m != null && m.IsPartialDefinition) {
ec.Report.Error (762, loc, "Cannot create delegate from partial method declaration `{0}'",
delegate_method.GetSignatureForError ());
} else {
ec.Report.Error (1618, loc, "Cannot create delegate with `{0}' because it has a Conditional attribute",
TypeManager.CSharpSignature (delegate_method));
}
}
var expr = method_group.InstanceExpression;
if (expr != null && (expr.Type.IsGenericParameter || !TypeSpec.IsReferenceType (expr.Type)))
method_group.InstanceExpression = new BoxedCast (expr, ec.BuiltinTypes.Object);
eclass = ExprClass.Value;
return this;
}
public override Expression DoResolve(ResolveContext ec)
{
constructor_method = Delegate.GetConstructor(ec.Compiler, ec.CurrentType, type);
MethodInfo invoke_method = Delegate.GetInvokeMethod(ec.Compiler, ec.CurrentType, type);
method_group.DelegateType = type;
method_group.CustomErrorHandler = this;
Arguments arguments = CreateDelegateMethodArguments(TypeManager.GetParameterData(invoke_method), loc);
method_group = method_group.OverloadResolve(ec, ref arguments, false, loc);
if (method_group == null)
{
return(null);
}
delegate_method = (MethodInfo)method_group;
if (TypeManager.IsNullableType(delegate_method.DeclaringType))
{
ec.Report.Error(1728, loc, "Cannot create delegate from method `{0}' because it is a member of System.Nullable<T> type",
TypeManager.GetFullNameSignature(delegate_method));
return(null);
}
Invocation.IsSpecialMethodInvocation(ec, delegate_method, loc);
ExtensionMethodGroupExpr emg = method_group as ExtensionMethodGroupExpr;
if (emg != null)
{
delegate_instance_expression = emg.ExtensionExpression;
Type e_type = delegate_instance_expression.Type;
if (TypeManager.IsValueType(e_type))
{
ec.Report.Error(1113, loc, "Extension method `{0}' of value type `{1}' cannot be used to create delegates",
TypeManager.CSharpSignature(delegate_method), TypeManager.CSharpName(e_type));
}
}
Type rt = TypeManager.TypeToCoreType(delegate_method.ReturnType);
Expression ret_expr = new TypeExpression(rt, loc);
if (!Delegate.IsTypeCovariant(ret_expr, (TypeManager.TypeToCoreType(invoke_method.ReturnType))))
{
Error_ConversionFailed(ec, delegate_method, ret_expr);
}
if (Invocation.IsMethodExcluded(delegate_method, loc))
{
ec.Report.SymbolRelatedToPreviousError(delegate_method);
MethodOrOperator m = TypeManager.GetMethod(delegate_method) as MethodOrOperator;
if (m != null && m.IsPartialDefinition)
{
ec.Report.Error(762, loc, "Cannot create delegate from partial method declaration `{0}'",
TypeManager.CSharpSignature(delegate_method));
}
else
{
ec.Report.Error(1618, loc, "Cannot create delegate with `{0}' because it has a Conditional attribute",
TypeManager.CSharpSignature(delegate_method));
}
}
DoResolveInstanceExpression(ec);
eclass = ExprClass.Value;
return(this);
}