1 files changed, 38 insertions, 0 deletions
diff --git a/Xamarin.Forms.Build.Tasks/MethodDefinitionExtensions.cs b/Xamarin.Forms.Build.Tasks/MethodDefinitionExtensions.cs
new file mode 100644
index 00000000..41d7cb20
--- /dev/null
+++ b/Xamarin.Forms.Build.Tasks/MethodDefinitionExtensions.cs
@@ -0,0 +1,38 @@
+using System.Collections.Generic;
+using Mono.Cecil;
+using Xamarin.Forms.Xaml;
+
+namespace Xamarin.Forms.Build.Tasks
+{
+	static class MethodDefinitionExtensions
+	{
+		public static bool MatchXArguments(this MethodDefinition methodDefinition, ElementNode enode, ModuleDefinition module)
+		{
+			if (!enode.Properties.ContainsKey(XmlName.xArguments))
+				return !methodDefinition.HasParameters;
+
+			var arguments = new List<INode>();
+			var node = enode.Properties[XmlName.xArguments] as ElementNode;
+			if (node != null)
+				arguments.Add(node);
+			var list = enode.Properties[XmlName.xArguments] as ListNode;
+			if (list != null)
+			{
+				foreach (var n in list.CollectionItems)
+					arguments.Add(n);
+			}
+
+			if (methodDefinition.Parameters.Count != arguments.Count)
+				return false;
+
+			for (var i = 0; i < methodDefinition.Parameters.Count; i++)
+			{
+				var paramType = methodDefinition.Parameters[i].ParameterType;
+				var argType = ((IElementNode)arguments[i]).XmlType.GetTypeReference(module, null);
+				if (!argType.InheritsFromOrImplements(paramType))
+					return false;
+			}
+			return true;
+		}
+	}
+}
+\ No newline at end of file