OrderBy-Take-Skip combination gives incorrect result #16669
Description
OrderBy followed by Take(2).Skip(1) gives empty list instead of list of size 1.
Repro code:
using System;
using System.Collections.Generic;
using System.Linq;
namespace ConsoleApplication
{
public class Program
{
public static void Main(string[] args)
{
var cs =
new List<Customer>
{
new Customer { CustomerID = "ANATR" },
new Customer { CustomerID = "ANTON" },
new Customer { CustomerID = "AROUT" },
new Customer { CustomerID = "BERGS" },
new Customer { CustomerID = "BONAP" },
new Customer { CustomerID = "ALFKI" },
};
// Only Skip
Console.WriteLine(cs.Count());
Console.WriteLine(cs.Skip(1).Count());
// OrderBy & Skip
Console.WriteLine(cs.OrderBy(c => c.CustomerID).Count());
Console.WriteLine(cs.OrderBy(c => c.CustomerID).Skip(1).Count());
// Take & Skip
Console.WriteLine(cs.Take(2).Count());
Console.WriteLine(cs.Take(2).Skip(1).Count());
// OrderBy, Take & Skip
Console.WriteLine(cs.OrderBy(c => c.CustomerID).Take(2).Count());
Console.WriteLine(cs.OrderBy(c => c.CustomerID).Take(2).Skip(1).Count());
Console.WriteLine("Hello World!");
}
}
public class Customer {
public string CustomerID {get; set;}
}
}project.json
{
"version": "1.0.0-*",
"compilationOptions": {
"emitEntryPoint": true
},
"dependencies": {
"NETStandard.Library": "1.0.0-rc2-23811"
},
"frameworks": {
"dnxcore50": { }
}
}Console Output:
D:\issue> dotnet run
Project issue (DNXCore,Version=v5.0) was previously compiled. Skipping compilation.
6
5
6
5
2
1
2
0 // Should have been 1
Hello World!