add commonly-used extension methods to String

MBS.Framework/MBS.Framework.csproj

@@ -58,6 +58,7 @@
     <Compile Include="Logic\ExpressionContext.cs" />
     <Compile Include="Logic\Variable.cs" />
     <Compile Include="Logic\Expressions\EmptyExpression.cs" />
+    <Compile Include="StringExtensions.cs" />
     <Compile Include="Logic\Expressions\ArithmeticExpression.cs" />
     <Compile Include="Logic\VariableRequestedEvent.cs" />
   </ItemGroup>

MBS.Framework/StringExtensions.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+
+namespace MBS.Framework
+{
+	public static class StringExtensions
+	{
+		public static string Capitalize(this string value)
+		{
+			if (String.IsNullOrEmpty(value)) return value;
+			if (value.Length == 1) return value.ToUpper();
+			return value[0].ToString().ToUpper() + value.Substring(1);
+		}
+		public static string ReplaceVariables(this string value, Dictionary<string, object> dict)
+		{
+			string retval = value;
+			foreach (KeyValuePair<string, object> kvp in dict)
+			{
+				retval = retval.Replace("$(" + kvp.Key + ")", kvp.Value == null ? String.Empty : kvp.Value.ToString());
+			}
+			return retval;
+		}
+	}
+}