System.Linq.Expressions.DynamicExpression1.IArgumentProvider C# (CSharp) Метод

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