Created S# .sln and moved project to src folder

ICD.Common/Attributes/Rpc/RpcAttribute.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+#if SIMPLSHARP
+using Crestron.SimplSharp.Reflection;
+#else
+using System.Reflection;
+#endif
+using ICD.Common.Properties;
+using ICD.Common.Utils;
+using ICD.Common.Utils.Collections;
+using ICD.Common.Utils.Extensions;
+
+namespace ICD.Common.Attributes.Rpc
+{
+	/// <summary>
+	/// Represents a method that can be called by the server via RPC.
+	/// </summary>
+	[PublicAPI]
+	[MeansImplicitUse]
+	[AttributeUsage(AttributeTargets.Method | AttributeTargets.Property, Inherited = true, AllowMultiple = false)]
+	public sealed class RpcAttribute : AbstractIcdAttribute
+	{
+		private static readonly Dictionary<Type, Dictionary<string, IcdHashSet<MethodInfo>>> s_MethodCache;
+		private static readonly Dictionary<Type, Dictionary<string, IcdHashSet<PropertyInfo>>> s_PropertyCache;
+
+		private static readonly SafeCriticalSection s_MethodCacheSection;
+		private static readonly SafeCriticalSection s_PropertyCacheSection;
+
+		private readonly string m_Key;
+
+		#region Constructors
+
+		/// <summary>
+		/// Constructor.
+		/// </summary>
+		static RpcAttribute()
+		{
+			s_MethodCache = new Dictionary<Type, Dictionary<string, IcdHashSet<MethodInfo>>>();
+			s_PropertyCache = new Dictionary<Type, Dictionary<string, IcdHashSet<PropertyInfo>>>();
+
+			s_MethodCacheSection = new SafeCriticalSection();
+			s_PropertyCacheSection = new SafeCriticalSection();
+		}
+
+		/// <summary>
+		/// Constructor.
+		/// </summary>
+		/// <param name="key"></param>
+		public RpcAttribute(string key)
+		{
+			m_Key = key;
+		}
+
+		#endregion
+
+		#region Methods
+
+		/// <summary>
+		/// Gets the method on the client with the given key, matching the parameter types.
+		/// </summary>
+		/// <param name="client"></param>
+		/// <param name="key"></param>
+		/// <param name="parameters"></param>
+		/// <returns></returns>
+		[CanBeNull]
+		public static MethodInfo GetMethod(object client, string key, IEnumerable<object> parameters)
+		{
+			return GetMethods(client, key).FirstOrDefault(m => ReflectionUtils.MatchesMethodParameters(m, parameters));
+		}
+
+		/// <summary>
+		/// Gets the property on the client with the given key, matching the parameter type.
+		/// </summary>
+		/// <param name="client"></param>
+		/// <param name="key"></param>
+		/// <param name="parameter"></param>
+		/// <returns></returns>
+		[CanBeNull]
+		public static PropertyInfo GetProperty(object client, string key, object parameter)
+		{
+			return GetProperties(client, key).FirstOrDefault(p => ReflectionUtils.MatchesPropertyParameter(p, parameter));
+		}
+
+		#endregion
+
+		#region Private Methods
+
+		/// <summary>
+		/// Returns the methods on the client with the given key.
+		/// </summary>
+		/// <param name="client"></param>
+		/// <param name="key"></param>
+		/// <returns></returns>
+		private static IEnumerable<MethodInfo> GetMethods(object client, string key)
+		{
+			s_MethodCacheSection.Enter();
+
+			try
+			{
+				Type clientType = client.GetType();
+
+				// Cache the methods for the key so subsequent calls are faster.
+				if (!s_MethodCache.ContainsKey(clientType))
+					s_MethodCache[clientType] = new Dictionary<string, IcdHashSet<MethodInfo>>();
+
+				if (!s_MethodCache[clientType].ContainsKey(key))
+				{
+					s_MethodCache[clientType][key] =
+						clientType
+#if SIMPLSHARP
+							.GetCType()
+#else
+                        .GetTypeInfo()
+#endif
+							.GetMethods(BindingFlags.Public |
+							            BindingFlags.NonPublic |
+							            BindingFlags.Instance)
+							.Where(m => m.GetCustomAttributes<RpcAttribute>(true)
+							             .Any(a => a.m_Key == key))
+							.ToHashSet();
+				}
+
+				return s_MethodCache[clientType][key];
+			}
+			finally
+			{
+				s_MethodCacheSection.Leave();
+			}
+		}
+
+		/// <summary>
+		/// Returns the properties on the client with the given key.
+		/// </summary>
+		/// <param name="client"></param>
+		/// <param name="key"></param>
+		/// <returns></returns>
+		private static IEnumerable<PropertyInfo> GetProperties(object client, string key)
+		{
+			s_PropertyCacheSection.Enter();
+
+			try
+			{
+				Type clientType = client.GetType();
+
+				// Cache the properties for the key so subsequent calls are faster.
+				if (!s_PropertyCache.ContainsKey(clientType))
+					s_PropertyCache[clientType] = new Dictionary<string, IcdHashSet<PropertyInfo>>();
+
+				if (!s_PropertyCache[clientType].ContainsKey(key))
+				{
+					s_PropertyCache[clientType][key] =
+						clientType
+#if SIMPLSHARP
+							.GetCType()
+#else
+                        .GetTypeInfo()
+#endif
+							.GetProperties(BindingFlags.Public |
+							               BindingFlags.NonPublic |
+							               BindingFlags.Instance)
+							.Where(p => p.CanWrite && p.GetCustomAttributes<RpcAttribute>(true)
+							                           .Any(a => a.m_Key == key))
+							.ToHashSet();
+				}
+
+				return s_PropertyCache[clientType][key];
+			}
+			finally
+			{
+				s_PropertyCacheSection.Leave();
+			}
+		}
+
+		#endregion
+	}
+}