ILSpy/ICSharpCode.Decompiler.Tests/TestCases/Pretty/QueryExpressions.cs

// Copyright (c) AlphaSierraPapa for the SharpDevelop Team
// 
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// 
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// substantial portions of the Software.
// 
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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using System;
using System.Collections.Generic;
using System.Linq;

namespace ICSharpCode.Decompiler.Tests.TestCases.Pretty
{
	public class QueryExpressions
	{
		public class Customer
		{
			public int CustomerID;
			public IEnumerable<Order> Orders;
			public string Name;
			public string Country;
			public string City;
		}

		public class Order
		{
			public int OrderID;
			public DateTime OrderDate;
			public Customer Customer;
			public int CustomerID;
			public decimal Total;
			public IEnumerable<OrderDetail> Details;
		}

		public class OrderDetail
		{
			public decimal UnitPrice;
			public int Quantity;
		}

		public IEnumerable<Customer> customers;
		public IEnumerable<Order> orders;

		public object MultipleWhere()
		{
			return from c in this.customers
				   where c.Orders.Count() > 10
				   where c.Country == "DE"
				   select c;
		}

		public object SelectManyFollowedBySelect()
		{
			return from c in this.customers
				   from o in c.Orders
				   select new {
					   c.Name,
					   o.OrderID,
					   o.Total
				   };
		}

		public object SelectManyFollowedByOrderBy()
		{
			return from c in this.customers
				   from o in c.Orders
				   orderby o.Total descending
				   select new {
					   c.Name,
					   o.OrderID,
					   o.Total
				   };
		}

		public object MultipleSelectManyFollowedBySelect()
		{
			return from c in this.customers
				   from o in c.Orders
				   from d in o.Details
				   select new {
					   c.Name,
					   o.OrderID,
					   d.Quantity
				   };
		}

		public object MultipleSelectManyFollowedByLet()
		{
			return from c in this.customers
				   from o in c.Orders
				   from d in o.Details
				   let x = (decimal)d.Quantity * d.UnitPrice
				   select new {
					   c.Name,
					   o.OrderID,
					   x
				   };
		}

		public object FromLetWhereSelect()
		{
			return from o in this.orders
				   let t = o.Details.Sum((OrderDetail d) => d.UnitPrice * (decimal)d.Quantity)
				   where t >= 1000m
				   select new {
					   OrderID = o.OrderID,
					   Total = t
				   };
		}

		public object MultipleLet()
		{
			return from a in this.customers
				   let b = a.Country
				   let c = a.Name
				   select b + c;
		}

		public object Join()
		{
			return from c in this.customers
				   join o in this.orders on c.CustomerID equals o.CustomerID
				   select new {
					   c.Name,
					   o.OrderDate,
					   o.Total
				   };
		}

		public object JoinInto()
		{
			return from c in this.customers
				   join o in this.orders on c.CustomerID equals o.CustomerID into co
				   let n = co.Count()
				   where n >= 10
				   select new {
					   Name = c.Name,
					   OrderCount = n
				   };
		}

		public object OrderBy()
		{
			return from o in this.orders
				   orderby o.Customer.Name, o.Total descending
				   select o;
		}

		public object GroupBy()
		{
			return from c in this.customers
				   group c.Name by c.Country;
		}

		public object ExplicitType()
		{
			return from Customer c in this.customers
				   where c.City == "London"
				   select c;
		}

		public object QueryContinuation()
		{
			return from c in this.customers
				   group c by c.Country into g
				   select new {
					   Country = g.Key,
					   CustCount = g.Count()
				   };
		}

		public object Issue437(bool[] bools)
		{
			return from x in bools
				   where x
				   select (x);
		}

		public static Maybe<TB> Cast<TA, TB>(Maybe<TA> a) where TB : class
		{
			return from m in a
				   let t = m as TB
				   where t != null
				   select t;
		}
	}

	public struct Maybe<T>
	{
		public T Value;
		public bool HasValue;
	}

	public static class MaybeExtensions
	{
		public static Maybe<TResult> Select<T, TResult>(this Maybe<T> a, Func<T, TResult> fn)
		{
			return default(Maybe<TResult>);
		}

		public static Maybe<T> Where<T>(this Maybe<T> a, Func<T, bool> predicate)
		{
			return default(Maybe<T>);
		}
	}
}