private string GetCacheKey(object instance, Arguments arguments)
        {
            // If we have no argument, return just the method name so we don't uselessly allocate memory.
            if (instance == null && arguments.Count == 0)
                return this._methodName;

            // Add all arguments to the cache key. Note that generic arguments are not part of the cache
            // key, so method calls that differ only by generic arguments will have conflicting cache keys.
            StringBuilder stringBuilder = new StringBuilder(this._methodName);
            stringBuilder.Append('(');
            if (instance != null)
            {
                stringBuilder.Append(instance);
                stringBuilder.Append("; ");
            }

            for (int i = 0; i < arguments.Count; i++)
            {
                stringBuilder.Append(arguments.GetArgument(i) ?? "null");
                stringBuilder.Append(", ");
            }

            return stringBuilder.ToString();
        }
        public string BuildCacheKey(object instance, Arguments arguments)
        {
            StringBuilder cacheKeyBuilder = new StringBuilder();

            // start building a key based on the method name if a group name not set
            if (string.IsNullOrWhiteSpace(GroupName))
            {
                cacheKeyBuilder.Append(MethodName);
            }
            else
            {
                cacheKeyBuilder.Append(GroupName);
            }

            if (instance != null)
            {
                cacheKeyBuilder.Append(instance);
                cacheKeyBuilder.Append(";");
            }

            int argIndex;
            switch (Settings)
            {
                case CacheSettings.IgnoreParameters:
                    return cacheKeyBuilder.ToString();

                case CacheSettings.UseId:
                    argIndex = GetArgumentIndexByName("Id");
                    cacheKeyBuilder.Append(arguments.GetArgument(argIndex) ?? "Null");
                    break;
                case CacheSettings.UseProperty:
                    argIndex = GetArgumentIndexByName(ParameterProperty);
                    cacheKeyBuilder.Append(arguments.GetArgument(argIndex) ?? "Null");
                    break;
                case CacheSettings.Default:
                    for (var i = 0; i < arguments.Count; i++)
                    {
                        BuildDefaultKey(arguments.GetArgument(i), cacheKeyBuilder);
                    }
                    break;
            }

            return cacheKeyBuilder.ToString();
        }