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public LookupExtensionMethod ( System.TypeSpec extensionType, string name, int arity, |
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| extensionType | System.TypeSpec | |
| name | string | |
| arity | int | |
| scope | ||
| Résultat | IList |
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///
/// Does extension methods look up to find a method which matches name and extensionType.
/// Search starts from this namespace and continues hierarchically up to top level.
///
public IList <MethodSpec> LookupExtensionMethod(TypeSpec extensionType, string name, int arity, ref NamespaceEntry scope)
{
List <MethodSpec> candidates = null;
foreach (Namespace n in GetUsingTable())
{
var a = n.LookupExtensionMethod(extensionType, RootContext.ToplevelTypes, name, arity);
if (a == null)
{
continue;
}
if (candidates == null)
{
candidates = a;
}
else
{
candidates.AddRange(a);
}
}
scope = parent;
if (candidates != null)
{
return(candidates);
}
if (parent == null)
{
return(null);
}
//
// Inspect parent namespaces in namespace expression
//
Namespace parent_ns = ns.Parent;
do
{
candidates = parent_ns.LookupExtensionMethod(extensionType, RootContext.ToplevelTypes, name, arity);
if (candidates != null)
{
return(candidates);
}
parent_ns = parent_ns.Parent;
} while (parent_ns != null);
//
// Continue in parent scope
//
return(parent.LookupExtensionMethod(extensionType, name, arity, ref scope));
}
MethodGroupExpr ResolveOverloadExtensions(ResolveContext ec, ref Arguments arguments, NamespaceEntry ns, Location loc)
{
// Use normal resolve rules
MethodGroupExpr mg = base.OverloadResolve (ec, ref arguments, ns != null, loc);
if (mg != null)
return mg;
if (ns == null)
return null;
// Search continues
int arity = type_arguments == null ? -1 : type_arguments.Count;
ExtensionMethodGroupExpr e = ns.LookupExtensionMethod (type, Name, arity, loc);
if (e == null)
return base.OverloadResolve (ec, ref arguments, false, loc);
e.ExtensionExpression = ExtensionExpression;
e.SetTypeArguments (ec, type_arguments);
return e.ResolveOverloadExtensions (ec, ref arguments, e.namespace_entry, loc);
}
///
/// Does extension methods look up to find a method which matches name and extensionType.
/// Search starts from this namespace and continues hierarchically up to top level.
///
public ExtensionMethodGroupExpr LookupExtensionMethod(Type extensionType, ClassOrStruct currentClass, string name, Location loc)
{
ArrayList candidates = null;
if (currentClass != null)
{
candidates = ns.LookupExtensionMethod(extensionType, currentClass, name);
if (candidates != null)
{
return(new ExtensionMethodGroupExpr(candidates, this, extensionType, loc));
}
}
foreach (Namespace n in GetUsingTable())
{
ArrayList a = n.LookupExtensionMethod(extensionType, null, name);
if (a == null)
{
continue;
}
if (candidates == null)
{
candidates = a;
}
else
{
candidates.AddRange(a);
}
}
if (candidates != null)
{
return(new ExtensionMethodGroupExpr(candidates, parent, extensionType, loc));
}
if (parent == null)
{
return(null);
}
//
// Inspect parent namespaces in namespace expression
//
Namespace parent_ns = ns.Parent;
do
{
candidates = parent_ns.LookupExtensionMethod(extensionType, null, name);
if (candidates != null)
{
return(new ExtensionMethodGroupExpr(candidates, parent, extensionType, loc));
}
parent_ns = parent_ns.Parent;
} while (parent_ns != null);
//
// Continue in parent scope
//
return(parent.LookupExtensionMethod(extensionType, currentClass, name, loc));
}