System.Diagnostics.DebuggerAttributes.GetProxyType C# (CSharp) Method

        private static Type GetProxyType(Type type)
        {
            // Get the DebuggerTypeProxyAttibute for obj
            var attrs =
                type.GetTypeInfo().CustomAttributes
                .Where(a => a.AttributeType == typeof(DebuggerTypeProxyAttribute))
                .ToArray();
            if (attrs.Length != 1)
            {
                throw new InvalidOperationException(
                    string.Format("Expected one DebuggerTypeProxyAttribute on {0}.", type));
            }
            CustomAttributeData cad = attrs[0];

            // Get the proxy type.  As written, this only works if the proxy and the target type
            // have the same generic parameters, e.g. Dictionary<TKey,TValue> and Proxy<TKey,TValue>.
            // It will not work with, for example, Dictionary<TKey,TValue>.Keys and Proxy<TKey>,
            // as the former has two generic parameters and the latter only one.
            Type proxyType = cad.ConstructorArguments[0].ArgumentType == typeof(Type) ?
                (Type)cad.ConstructorArguments[0].Value :
                Type.GetType((string)cad.ConstructorArguments[0].Value);
            var genericArguments = type.GenericTypeArguments;
            if (genericArguments.Length > 0)
            {
                proxyType = proxyType.MakeGenericType(genericArguments);
            }

            return proxyType;
        }