From 5abbca0f5da48d028db3df7d7ba7e58c2c01b905 Mon Sep 17 00:00:00 2001
From: Darren Ferguson <df@darren-ferguson.com>
Date: Wed, 14 May 2014 11:32:39 +0100
Subject: [PATCH] Adding extension methods to PartialViewMacroModel to allow:
 Model.GetParameterValue<DateTime>("datey")

Model.GetParameterValue<int>("booly", 8) //optional default value if parsing can't happen
Model.GetParameterValue("booly",8) // can be used like this as type is implied by default value argument
---
 .../Models/PartialViewMacroModelExtensions.cs | 38 +++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 src/Umbraco.Web/Models/PartialViewMacroModelExtensions.cs

diff --git a/src/Umbraco.Web/Models/PartialViewMacroModelExtensions.cs b/src/Umbraco.Web/Models/PartialViewMacroModelExtensions.cs
new file mode 100644
index 0000000000..8b4c8ed224
--- /dev/null
+++ b/src/Umbraco.Web/Models/PartialViewMacroModelExtensions.cs
@@ -0,0 +1,38 @@
+using Umbraco.Core;
+
+namespace Umbraco.Web.Models
+{
+    /// <summary>
+    /// Extension methods for the PartialViewMacroModel object
+    /// </summary>
+    public static class PartialViewMacroModelExtensions
+    {
+        /// <summary>
+        /// Attempt to get a Marco parameter from a PartialViewMacroModel and return a default value otherwise
+        /// </summary>
+        /// <param name="partialViewMacroModel"></param>
+        /// <param name="parameterAlias"></param>
+        /// <param name="defaultValue"></param>
+        /// <returns>Parameter value if available, the default value that was passed otherwise.</returns>       
+        public static T GetParameterValue<T>(this PartialViewMacroModel partialViewMacroModel, string parameterAlias, T defaultValue)
+        {
+            if (partialViewMacroModel.MacroParameters.ContainsKey(parameterAlias) == false || string.IsNullOrEmpty(partialViewMacroModel.MacroParameters[parameterAlias].ToString())) 
+                return defaultValue;
+
+            var attempt = partialViewMacroModel.MacroParameters[parameterAlias].TryConvertTo(typeof(T));
+
+            return attempt.Success ? (T) attempt.Result : defaultValue;
+        }
+
+        /// <summary>
+        /// Attempt to get a Marco parameter from a PartialViewMacroModel
+        /// </summary>
+        /// <param name="partialViewMacroModel"></param>
+        /// <param name="parameterAlias"></param>
+        /// <returns>Parameter value if available, the default value for the type otherwise.</returns>       
+        public static T GetParameterValue<T>(this PartialViewMacroModel partialViewMacroModel, string parameterAlias)
+        {
+            return partialViewMacroModel.GetParameterValue(parameterAlias, default(T));
+        }
+    }
+}