System.Linq.Expressions.DynamicExpression4.IArgumentProvider C# (CSharp) Метод

        Expression IArgumentProvider.GetArgument(int index)
        {
            switch (index)
            {
                case 0: return ExpressionUtils.ReturnObject<Expression>(_arg0);
                case 1: return _arg1;
                case 2: return _arg2;
                case 3: return _arg3;
                default: throw new ArgumentOutOfRangeException(nameof(index));
            }
        }