1 files changed, 31 insertions, 0 deletions
diff --git a/Ivy/IvyBindingAttribute.cs b/Ivy/IvyBindingAttribute.cs
new file mode 100644
index 0000000..90c44ce
--- /dev/null
+++ b/Ivy/IvyBindingAttribute.cs
@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace IvyBus
+{
+    [AttributeUsage(AttributeTargets.Method,AllowMultiple = true)]
+    public sealed class IvyBindingAttribute : Attribute
+    {
+        private string expression;
+        private string[] args;
+
+        // translate part of expression to object property
+        public string GetExpression(object obj)
+        {
+            if (obj == null) return string.Format(expression);
+            object[] values = new object[args.Length];
+            for (int i = 0; i < args.Length; i++)
+            {
+                values[i] = obj.GetType().GetProperty(args[i]).GetValue(obj,null);
+            }
+            return string.Format(expression,values);
+        }
+
+        public IvyBindingAttribute(string expression, params string[] args)
+        {
+            this.expression = expression;
+            this.args = args;
+        }
+    }
+}