[Xaml[C]] supports 'using:' xmlns declarations (#851)

1 files changed, 25 insertions, 0 deletions

diff --git a/Xamarin.Forms.Xaml/XmlnsHelper.cs b/Xamarin.Forms.Xaml/XmlnsHelper.cs
index e29dbc0c..5f7efd48 100644
--- a/Xamarin.Forms.Xaml/XmlnsHelper.cs
+++ b/Xamarin.Forms.Xaml/XmlnsHelper.cs
@@ -20,6 +20,19 @@ namespace Xamarin.Forms.Xaml
 		{
 			typeName = ns = asm = targetPlatform = null;
 
+			xmlns = xmlns.Trim();
+
+			if (xmlns.StartsWith("using:", StringComparison.Ordinal)) {
+				ParseUsing(xmlns, out typeName, out ns, out asm, out targetPlatform);
+				return;
+			}
+			ParseClrNamespace(xmlns, out typeName, out ns, out asm, out targetPlatform);
+		}
+
+		static void ParseClrNamespace(string xmlns, out string typeName, out string ns, out string asm, out string targetPlatform)
+		{
+			typeName = ns = asm = targetPlatform = null;
+
 			foreach (var decl in xmlns.Split(';'))
 			{
 				if (decl.StartsWith("clr-namespace:", StringComparison.Ordinal))
@@ -46,5 +59,17 @@ namespace Xamarin.Forms.Xaml
 					typeName = decl;
 			}
 		}
+
+		static void ParseUsing(string xmlns, out string typeName, out string ns, out string asm, out string targetPlatform)
+		{
+			typeName = ns = asm = targetPlatform = null;
+
+			foreach (var decl in xmlns.Split(';')) {
+				if (decl.StartsWith("using:", StringComparison.Ordinal)) {
+					ns = decl.Substring(6, decl.Length - 6);
+					continue;
+				}
+			}
+		}
 	}
 }
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