Merge pull request #29 from AndreiCsibi-msft/NotDefaultOnStructs

Adding NotDefault method to check structs values against default values.

src/Validation/Requires.cs

@@ -126,7 +126,7 @@ public static T NotNullAllowStructs<T>([ValidatedNotNull]T value, string paramet
         public static void NotNullOrEmpty([ValidatedNotNull]string value, string parameterName)
         {
             // To the guy that is doing random code cleaning:
-            // Consider the perfomance when changing the code to delegate to NotNull.
+            // Consider the performance when changing the code to delegate to NotNull.
             // In general do not chain call to another function, check first and return as earlier as possible.
             if (value == null)
             {
@@ -150,7 +150,7 @@ public static void NotNullOrEmpty([ValidatedNotNull]string value, string paramet
         public static void NotNullOrWhiteSpace([ValidatedNotNull]string value, string parameterName)
         {
             // To the guy that is doing random code cleaning:
-            // Consider the perfomance when changing the code to delegate to NotNull.
+            // Consider the performance when changing the code to delegate to NotNull.
             // In general do not chain call to another function, check first and return as earlier as possible.
             if (value == null)
             {
@@ -180,7 +180,7 @@ public static void NotNullOrWhiteSpace([ValidatedNotNull]string value, string pa
         public static void NotNullOrEmpty([ValidatedNotNull]System.Collections.IEnumerable values, string parameterName)
         {
             // To the guy that is doing random code cleaning:
-            // Consider the perfomance when changing the code to delegate to NotNull.
+            // Consider the performance when changing the code to delegate to NotNull.
             // In general do not chain call to another function, check first and return as earlier as possible.
             if (values == null)
             {
@@ -316,6 +316,25 @@ public static void Defined<T>(T value, string parameterName)
             }
         }
 
+        /// <summary>
+        /// Throws an <see cref="ArgumentException"/> if the specified parameter's value is equal to the 
+        /// default value of the <see cref="Type"/> <typeparamref name="T"/>.
+        /// </summary>
+        /// <typeparam name="T">The type of the parameter.</typeparam>
+        /// <param name="value">The value of the argument.</param>
+        /// <param name="parameterName">The name of the parameter to include in any thrown exception.</param>
+        /// <exception cref="ArgumentException">Thrown if <paramref name="value"/> is <c>null</c> or empty.</exception>
+        [DebuggerStepThrough]
+        public static void NotDefault<T>(T value, string parameterName)
+            where T : struct
+        {
+            var defaultValue = default(T);
+            if (defaultValue.Equals(value))
+            {
+                throw new ArgumentException(Format(Strings.Argument_StructIsDefault, parameterName, typeof(T).FullName), parameterName);
+            }
+        }
+
         /// <summary>
         /// Throws an ArgumentException if a condition does not evaluate to true.
         /// </summary>

src/Validation/Strings.resx

@@ -129,6 +129,9 @@
   <data name="Argument_NullElement" xml:space="preserve">
     <value>'{0}' cannot contain a null (Nothing in Visual Basic) element.</value>
   </data>
+  <data name="Argument_StructIsDefault" xml:space="preserve">
+    <value>'{0}' cannot be the default value defined by '{1}'.</value>
+  </data>
   <data name="Argument_Whitespace" xml:space="preserve">
     <value>The parameter "{0}" cannot consist entirely of white space characters.</value>
   </data>

src/Validation/Validation.csproj

@@ -19,6 +19,12 @@
     <AssemblyOriginatorKeyFile>opensource.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
 
+  <ItemGroup>
+    <EmbeddedResource Update="Strings.resx">
+      <Generator>ResXFileCodeGenerator</Generator>
+    </EmbeddedResource>
+  </ItemGroup>
+
   <ItemGroup>
     <None Include="tools\**">
       <Pack>true</Pack>