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SelectTests.cs
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84 lines (73 loc) · 2.88 KB
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.Linq.Expressions;
using Xunit;
namespace System.Linq.Tests
{
public class SelectTests : EnumerableBasedTests
{
[Fact]
public void SelectProperty()
{
var source = new []{
new { name="Prakash", custID=98088 },
new { name="Bob", custID=29099 },
new { name="Chris", custID=39033 },
new { name=(string)null, custID=30349 },
new { name="Prakash", custID=39030 }
};
string[] expected = { "Prakash", "Bob", "Chris", null, "Prakash" };
Assert.Equal(expected, source.AsQueryable().Select(e => e.name));
}
[Fact]
public void SelectPropertyUsingIndex()
{
var source = new[]{
new { name="Prakash", custID=98088 },
new { name="Bob", custID=29099 },
new { name="Chris", custID=39033 }
};
string[] expected = { "Prakash", null, null };
Assert.Equal(expected, source.AsQueryable().Select((e, i) => i == 0 ? e.name : null));
}
[Fact]
public void Select_SourceIsNull_ArgumentNullExceptionThrown()
{
IQueryable<int> source = null;
AssertExtensions.Throws<ArgumentNullException>("source", () => source.Select(i => i + 1));
}
[Fact]
public void Select_SelectorIsNull_ArgumentNullExceptionThrown_Indexed()
{
IQueryable<int> source = Enumerable.Range(1, 10).AsQueryable();
Expression<Func<int, int, int>> selector = null;
AssertExtensions.Throws<ArgumentNullException>("selector", () => source.Select(selector));
}
[Fact]
public void Select_SourceIsNull_ArgumentNullExceptionThrown_Indexed()
{
IQueryable<int> source = null;
AssertExtensions.Throws<ArgumentNullException>("source", () => source.Select((e, i) => i + 1));
}
[Fact]
public void Select_SelectorIsNull_ArgumentNullExceptionThrown()
{
IQueryable<int> source = Enumerable.Range(1, 10).AsQueryable();
Expression<Func<int, int>> selector = null;
AssertExtensions.Throws<ArgumentNullException>("selector", () => source.Select(selector));
}
[Fact]
public void Select1()
{
var count = (new object[] { 0, 1, 2 }).AsQueryable().Select(o => (int)o).Count();
Assert.Equal(3, count);
}
[Fact]
public void Select2()
{
var count = (new object[] { 0, 1, 2 }).AsQueryable().Select((o, i) => (int)o + i).Count();
Assert.Equal(3, count);
}
}
}