System.Linq.Expressions.Expression.ArrayLength C# (CSharp) Method

        public static UnaryExpression ArrayLength(Expression array)
        {
            ContractUtils.RequiresNotNull(array, nameof(array));
            if (!array.Type.IsArray || !typeof(Array).IsAssignableFrom(array.Type))
            {
                throw Error.ArgumentMustBeArray(nameof(array));
            }
            if (!array.Type.IsVector())
            {
                throw Error.ArgumentMustBeSingleDimensionalArrayType(nameof(array));
            }
            return new UnaryExpression(ExpressionType.ArrayLength, array, typeof(int), null);
        }

        private UnaryExpression UnaryExpression(
            ExpressionType nodeType, System.Type type, JObject obj)
        {
            var operand = this.Prop(obj, "operand", this.Expression);
            var method  = this.Prop(obj, "method", this.Method);

            switch (nodeType)
            {
            case ExpressionType.ArrayLength: return(Expr.ArrayLength(operand));

            case ExpressionType.Convert: return(Expr.Convert(operand, type, method));

            case ExpressionType.ConvertChecked: return(Expr.ConvertChecked(operand, type, method));

            case ExpressionType.Decrement: return(Expr.Decrement(operand, method));

            case ExpressionType.Increment: return(Expr.Increment(operand, method));

            case ExpressionType.IsFalse: return(Expr.IsFalse(operand, method));

            case ExpressionType.IsTrue: return(Expr.IsTrue(operand, method));

            case ExpressionType.Negate: return(Expr.Negate(operand, method));

            case ExpressionType.NegateChecked: return(Expr.NegateChecked(operand, method));

            case ExpressionType.Not: return(Expr.Not(operand, method));

            case ExpressionType.OnesComplement: return(Expr.OnesComplement(operand, method));

            case ExpressionType.PostDecrementAssign: return(Expr.PostDecrementAssign(operand, method));

            case ExpressionType.PostIncrementAssign: return(Expr.PostIncrementAssign(operand, method));

            case ExpressionType.PreDecrementAssign: return(Expr.PreDecrementAssign(operand, method));

            case ExpressionType.PreIncrementAssign: return(Expr.PreIncrementAssign(operand, method));

            case ExpressionType.Quote: return(Expr.Quote(operand));

            case ExpressionType.Throw: return(Expr.Throw(operand, type));

            case ExpressionType.TypeAs: return(Expr.TypeAs(operand, type));

            case ExpressionType.UnaryPlus: return(Expr.UnaryPlus(operand, method));

            case ExpressionType.Unbox: return(Expr.Unbox(operand, type));

            default: throw new NotSupportedException();
            }
        }