public void IndexOfWithStartIndex_ComparerWithMatchBeforeAndAfterStartIndex_IndexOfMatchedInstanceAfterStartIndexIsReturned()
{
List <TestDummy> collection = new List <TestDummy> {
new TestDummy {
TextValue = "DummyA"
},
new TestDummy {
TextValue = "DummyB"
},
new TestDummy {
TextValue = "DummyC"
},
new TestDummy {
TextValue = "DummyB"
},
new TestDummy {
TextValue = "DummyE"
}
};
TestDummy selectionDummy = new TestDummy {
TextValue = "DummyB"
};
/* The extension method will be able to find the object because it uses a custom comparer */
LambdaEqualityComparer <TestDummy, string> comparer = new LambdaEqualityComparer <TestDummy, string>(td => td.TextValue);
int result = collection.IndexOf(selectionDummy, 2, comparer);
Assert.AreEqual(3, result);
}
public void ConstructorFuncOfTOfObject_should_use_specified_key_equality()
{
// Arrange
var getHashCodeCalled = new List <bool>();
var equalsCalled = new List <bool>();
var mock1 = new MockParent();
mock1.Key.GetHashCodeProvider = () => { getHashCodeCalled.Add(true); return(0); };
mock1.Key.EqualsProvider = obj => { equalsCalled.Add(true); return(obj.Equals(null)); };
var mock2 = new MockParent();
mock2.Key.GetHashCodeProvider = () => { getHashCodeCalled.Add(true); return(0); };
mock2.Key.EqualsProvider = obj => { equalsCalled.Add(true); return(true); };
// Act
var comparer = new LambdaEqualityComparer <MockParent>(_ => _.Key);
var hashCode = comparer.GetHashCode(mock1);
var isEqual = comparer.Equals(mock1, mock2);
// Assert
CollectionAssert.AreEqual(new[] { true }, getHashCodeCalled);
CollectionAssert.AreEqual(new[] { true, true }, equalsCalled);
Assert.AreEqual(0, hashCode);
Assert.IsTrue(isEqual);
}
public void ctor_Observation_IsSet(SimulationResultQuote sut)
{
var comparer = new LambdaEqualityComparer<Observation>(
EqualsMethod: (o1,o2) => o1.Date == o2.Date && o1.CurrentQuoteCount.SequenceEqual(o2.CurrentQuoteCount));
Assert.Equal<Observation>(Observation, sut.Observation, comparer );
}
public void IndexOfWithStartIndexAndCount_ComparerWithNoMatch_NoIndexIsReturned()
{
List <TestDummy> collection = new List <TestDummy> {
new TestDummy {
TextValue = "DummyA"
},
new TestDummy {
TextValue = "DummyB"
},
new TestDummy {
TextValue = "DummyC"
},
new TestDummy {
TextValue = "DummyD"
},
new TestDummy {
TextValue = "DummyE"
},
new TestDummy {
TextValue = "DummyF"
}
};
TestDummy selectionDummy = new TestDummy {
TextValue = "DummyG"
};
/* The extension method will be able to find the object because it uses a custom comparer */
LambdaEqualityComparer <TestDummy, string> comparer = new LambdaEqualityComparer <TestDummy, string>(td => td.TextValue);
int result = collection.IndexOf(selectionDummy, 0, 6, comparer);
Assert.AreEqual(-1, result);
}
public void IndexOfWithStartIndexAndCount_ComparerWithMultipleMatchesAfterStartIndexWithinCount_IndexOfFirstMatchedInstanceIsReturned()
{
List <TestDummy> collection = new List <TestDummy> {
new TestDummy {
TextValue = "DummyA"
},
new TestDummy {
TextValue = "DummyB"
},
new TestDummy {
TextValue = "DummyC"
},
new TestDummy {
TextValue = "DummyD"
},
new TestDummy {
TextValue = "DummyC"
},
new TestDummy {
TextValue = "DummyF"
}
};
TestDummy selectionDummy = new TestDummy {
TextValue = "DummyC"
};
/* The extension method will be able to find the object because it uses a custom comparer */
LambdaEqualityComparer <TestDummy, string> comparer = new LambdaEqualityComparer <TestDummy, string>(td => td.TextValue);
int result = collection.IndexOf(selectionDummy, 1, 5, comparer);
Assert.AreEqual(2, result);
}
public void TestCase04_TreeMethodAccess()
{
LambdaEqualityComparer <TestDummy, string> comparer = new LambdaEqualityComparer <TestDummy, string>(td => td.Leaf.RetrieveTestValue());
/* Situation 1: leaf.TextValue is equal, therefore result of leaf.RetrieveTestValue is equal */
TestDummy dummyA = new TestDummy {
TextValue = "Hello World", Leaf = new SubTestDummy {
TextValue = "Goodmorning"
}
};
TestDummy dummyB = new TestDummy {
TextValue = "Hello World", Leaf = new SubTestDummy {
TextValue = "Goodmorning"
}
};
bool result = comparer.Equals(dummyA, dummyB);
Assert.IsTrue(result);
/* Situation 2: leaf.TextValue is not equal, therefore result of leaf.RetrieveTestValue is not equal */
dummyA = new TestDummy {
TextValue = "Hello World", Leaf = new SubTestDummy {
TextValue = "Goodmorning"
}
};
dummyB = new TestDummy {
TextValue = "Hello World", Leaf = new SubTestDummy {
TextValue = "goodMorning"
}
};
result = comparer.Equals(dummyA, dummyB);
Assert.IsFalse(result);
}
public void TestCase03_MethodAccess()
{
LambdaEqualityComparer <TestDummy, string> comparer = new LambdaEqualityComparer <TestDummy, string>(td => td.RetrieveTestValue());
/* Situation 1: TextValue is equal, therefore result of RetrieveTestValue is equal */
TestDummy dummyA = new TestDummy {
TextValue = "Hello World"
};
TestDummy dummyB = new TestDummy {
TextValue = "Hello World"
};
bool result = comparer.Equals(dummyA, dummyB);
Assert.IsTrue(result);
/* Situation 2: TextValue is not equal, therefore result of RetrieveTestValue is not equal */
dummyA = new TestDummy {
TextValue = "Hello World"
};
dummyB = new TestDummy {
TextValue = "hello world"
};
result = comparer.Equals(dummyA, dummyB);
Assert.IsFalse(result);
}
private void AssertResultMatchesExpectedTokens(string code, List <TokenBase> expectedTokens)
{
Lexer lexer = new Lexer();
List <TokenBase> tokens = lexer.Lex(code);
bool equal = tokens.SequenceEqual(expectedTokens, LambdaEqualityComparer <TokenBase> .Create(
(a, b) => a.GetType() == b.GetType() && a.Contents == b.Contents
));
Assert.True(equal, "Token sequence did not match.");
}
public void TestCase01_DirectPropertyAccess()
{
LambdaEqualityComparer <TestDummy, string> comparer = new LambdaEqualityComparer <TestDummy, string>(td => td.TextValue);
/* Situation 1: TextValue is equal, numeric value is not equal */
TestDummy dummyA = new TestDummy {
TextValue = "Hello World", NumericValue = 5
};
TestDummy dummyB = new TestDummy {
TextValue = "Hello World", NumericValue = 6
};
bool result = comparer.Equals(dummyA, dummyB);
Assert.IsTrue(result);
/* Situation 2: TextValue is not equal, numeric value is not equal */
dummyA = new TestDummy {
TextValue = "Hello World", NumericValue = 5
};
dummyB = new TestDummy {
TextValue = "hello world", NumericValue = 6
};
result = comparer.Equals(dummyA, dummyB);
Assert.IsFalse(result);
/* Situation 3: First TextValue is null, numeric value is not equal */
dummyA = new TestDummy {
TextValue = null, NumericValue = 5
};
dummyB = new TestDummy {
TextValue = "hello world", NumericValue = 6
};
result = comparer.Equals(dummyA, dummyB);
Assert.IsFalse(result);
/* Situation 4: Second TextValue is null, numeric value is not equal */
dummyA = new TestDummy {
TextValue = "Hello World", NumericValue = 5
};
dummyB = new TestDummy {
TextValue = null, NumericValue = 6
};
result = comparer.Equals(dummyA, dummyB);
Assert.IsFalse(result);
/* Situation 5: Both TextValues are null, numeric value is not equal */
dummyA = new TestDummy {
TextValue = null, NumericValue = 5
};
dummyB = new TestDummy {
TextValue = null, NumericValue = 6
};
result = comparer.Equals(dummyA, dummyB);
Assert.IsTrue(result);
}
public void EqualityComparer_can_be_provided_in_ToBe()
{
using (var s = new MarbleScheduler())
{
var veryCuriousEqualityComparer =
new LambdaEqualityComparer <int>((a, b) => Math.Abs(a - b) == 1, x => 0);
s.ExpectObservable(Observable.Return(1)).ToBe(
"(x|)",
Dict.Map('x', 2),
comparer: veryCuriousEqualityComparer);
}
}
public void LambdaEqualityComparer_ShouldInvokeGetHashCodeParameter_IfGetHashCodeIsCalled()
{
var called = false;
var comparer = new LambdaEqualityComparer <string>((s1, s2) => s1 == s2, s =>
{
called = true;
return(s.GetHashCode());
});
comparer.GetHashCode("s");
called.Should().BeTrue();
}
public void LambdaEqualityComparer_ShouldInvokeEqualsParameter_IfEqualsIsCalled()
{
var called = false;
var comparer = new LambdaEqualityComparer <string>((s1, s2) =>
{
called = true;
return(s1 == s2);
}, s => s.GetHashCode());
comparer.Equals("s1", "s2");
called.Should().BeTrue();
}
public static IEnumerable <T> Except <T>(this IEnumerable <T> first, IEnumerable <T> second, Func <T, T, bool> comparer, Func <T, int> hasher)
{
if (comparer == null)
{
throw new ArgumentNullException("comparer");
}
if (hasher == null)
{
throw new ArgumentNullException("hasher");
}
return(first.Except(second, LambdaEqualityComparer.Create(comparer, hasher)));
}
public static HashSet <T> ToHashSet <T>(this IEnumerable <T> source, Func <T, T, bool> comparer, Func <T, int> hasher)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (comparer == null)
{
throw new ArgumentNullException("comparer");
}
return(new HashSet <T>(source, LambdaEqualityComparer.Create(comparer, hasher)));
}
public static IEnumerable <T> Distinct <T>(this IEnumerable <T> source, Func <T, T, bool> comparer, Func <T, int> hasher)
{
if (comparer == null)
{
throw new ArgumentNullException("comparer");
}
if (hasher == null)
{
throw new ArgumentNullException("hasher");
}
return(source.Distinct(LambdaEqualityComparer.Create(comparer, hasher)));
}
public void CompareFunctionOfNonEqualPropertiesResultsInFalseResult()
{
var t1 = new CompareTest {
Prop = "Test"
};
var t2 = new CompareTest {
Prop = "ASDF"
};
var compareFunc = new Func <CompareTest, CompareTest, bool>((x, y) => x.Prop == y.Prop);
var comparer = new LambdaEqualityComparer <CompareTest>(compareFunc);
Assert.IsFalse(comparer.Equals(t1, t2));
Assert.IsFalse(object.Equals(t1, t2));
}
public void IndexOf_EmptyCollection_NoIndexIsReturned()
{
IList <TestDummy> collection = new List <TestDummy>();
TestDummy selectionDummy = new TestDummy {
TextValue = "DummyF"
};
/* The extension method will be able to find the object because it uses a custom comparer */
LambdaEqualityComparer <TestDummy, string> comparer = new LambdaEqualityComparer <TestDummy, string>(td => td.TextValue);
int result = collection.IndexOf(selectionDummy, comparer);
Assert.AreEqual(-1, result);
}
public void Remove_EmptyCollection_NoInstanceIsRemovedFromCollection()
{
ICollection <TestDummy> collection = new List <TestDummy>();
TestDummy selectionDummy = new TestDummy {
TextValue = "DummyF"
};
/* The extension method will be able to remove the object because it uses a custom comparer */
LambdaEqualityComparer <TestDummy, string> comparer = new LambdaEqualityComparer <TestDummy, string>(td => td.TextValue);
bool result = collection.Remove(selectionDummy, comparer);
Assert.IsFalse(result);
Assert.AreEqual(0, collection.Count);
}
private static bool HasDuplicates <T>(this IEnumerable <T> source, LambdaEqualityComparer <T> lambdaEqualityComparer)
{
bool result = false;
HashSet <T> hashSet = lambdaEqualityComparer != null ? new HashSet <T>(lambdaEqualityComparer) : new HashSet <T>();
foreach (T element in source)
{
if (!hashSet.Add(element))
{
result = true;
break;
}
}
return(result);
}
public void PerformsSetOperationsWithLambdaComparer()
{
var comparer = new LambdaEqualityComparer <TestClass>((x, y) => x.TestProperty == y.TestProperty);
IEnumerable <TestClass> set1 = new TestClass {
TestProperty = "Test1"
}.ToEnumerable();
IEnumerable <TestClass> set2 = new TestClass {
TestProperty = "Test2"
}.ToEnumerable();
IEnumerable <TestClass> set3 = new TestClass {
TestProperty = "Test3"
}.ToEnumerable();
// Create a Union of [Test1] and [Test2], which should result in [Test1, Test2]
IEnumerable <TestClass> union1 = set1.Union(set2, comparer);
Assert.AreEqual(2, union1.Count());
// Create a Union of [Test1, Test2] and [Test2], which should still result in [Test1, Test2]
IEnumerable <TestClass> union2 = union1.Union(set2, comparer);
Assert.AreEqual(2, union2.Count());
// Create a Subtraction of [Test1, Test2] and [Test1], which should result in [Test2]
IEnumerable <TestClass> except1 = union2.Except(set1, comparer);
Assert.AreEqual(1, except1.Count());
Assert.AreEqual("Test2", except1.First().TestProperty);
// Create an intersection of [Test1, Test2] and [Test2, Test3], which should result in [Test2]
IEnumerable <TestClass> union3 = set2.Union(set3, comparer);
IEnumerable <TestClass> intersect1 = union2.Intersect(union3, comparer);
Assert.AreEqual(1, intersect1.Count());
Assert.AreEqual("Test2", intersect1.First().TestProperty);
// Do a distinct on [Test1, Test2, Test2] which should result in [Test1, Test2]
IEnumerable <TestClass> concat1 = union2.Concat(set2);
IEnumerable <TestClass> distinct1 = concat1.Distinct(comparer);
Assert.AreEqual(2, distinct1.Count());
Assert.IsTrue(distinct1.Where(x => x.TestProperty == "Test1").Any());
Assert.IsTrue(distinct1.Where(x => x.TestProperty == "Test2").Any());
}
/// <summary>
/// Updates a collection, adding/removing values.
/// All newValues must already exist in the database.
/// Does not update the fields of each element.
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="collection"></param>
/// <param name="newValues"></param>
/// <param name="context"></param>
public static void UpdateCollection <T>(this ICollection <T> collection, IEnumerable <T> newValues, IMyDbContext context) where T : class, IEntity
{
var comparer = new LambdaEqualityComparer <T>((x, y) => x.ID == y.ID, x => x.ID);
var toAdd = newValues.Except(collection, comparer).ToList();
var toRemove = collection.Except(newValues, comparer).ToList();
//grab everything so we don't need an individual query for every item
var allItems = context.Set <T>().ToList().ToDictionary(x => x.ID, x => x);
foreach (var element in toAdd)
{
var entry = allItems[element.ID];
collection.Add(entry);
}
foreach (var element in toRemove)
{
var entry = allItems[element.ID];
collection.Remove(entry);
}
}
public static bool HasDuplicates <T>(this IEnumerable <T> source, Func <T, T, bool> comparer, Func <T, int> hasher)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (comparer == null)
{
throw new ArgumentNullException("comparer");
}
if (hasher == null)
{
throw new ArgumentNullException("hasher");
}
return(source.HasDuplicates(LambdaEqualityComparer.Create(comparer, hasher)));
}
public void ConstructorFuncOfTOfint_should_use_default_Equals_and_specified_GetHashCode()
{
// Arrange
var getHashCodeCalled = false;
var equalsCalled = false;
var mock = new MockObject();
mock.GetHashCodeProvider = () => { getHashCodeCalled = true; return 0; };
mock.EqualsProvider = obj => { equalsCalled = true; return true; };
// Act
var comparer = new LambdaEqualityComparer<MockObject>(_ => 0);
var hashCode = comparer.GetHashCode(mock);
var isEqual = comparer.Equals(mock, mock);
// Assert
Assert.IsFalse(getHashCodeCalled);
Assert.IsTrue(equalsCalled);
Assert.AreEqual(0, hashCode);
Assert.IsTrue(isEqual);
}
public void Remove_ComparerWithNoMatch_NoInstanceIsRemovedFromCollection()
{
TestDummy dummyA = new TestDummy {
TextValue = "DummyA"
};
TestDummy dummyB = new TestDummy {
TextValue = "DummyB"
};
TestDummy dummyC = new TestDummy {
TextValue = "DummyC"
};
TestDummy dummyD = new TestDummy {
TextValue = "DummyD"
};
TestDummy dummyE = new TestDummy {
TextValue = "DummyE"
};
List <TestDummy> collection = new List <TestDummy> {
dummyA, dummyB, dummyC, dummyD, dummyE
};
TestDummy selectionDummy = new TestDummy {
TextValue = "DummyF"
};
/* The extension method will be able to remove the object because it uses a custom comparer */
LambdaEqualityComparer <TestDummy, string> comparer = new LambdaEqualityComparer <TestDummy, string>(td => td.TextValue);
bool result = collection.Remove(selectionDummy, comparer);
Assert.IsFalse(result);
Assert.AreEqual(5, collection.Count);
CollectionAssert.Contains(collection, dummyA);
CollectionAssert.Contains(collection, dummyB);
CollectionAssert.Contains(collection, dummyC);
CollectionAssert.Contains(collection, dummyD);
CollectionAssert.Contains(collection, dummyE);
}
public void Remove_ComparerWithMultipleMatches_FirstMatchedInstanceIsRemovedFromCollection()
{
TestDummy dummyA = new TestDummy {
TextValue = "DummyA"
};
TestDummy dummyB1 = new TestDummy {
TextValue = "DummyB"
};
TestDummy dummyC = new TestDummy {
TextValue = "DummyC"
};
TestDummy dummyD = new TestDummy {
TextValue = "DummyD"
};
TestDummy dummyB2 = new TestDummy {
TextValue = "DummyB"
};
List <TestDummy> collection = new List <TestDummy> {
dummyA, dummyB1, dummyC, dummyD, dummyB2
};
TestDummy selectionDummy = new TestDummy {
TextValue = "DummyB"
};
/* The extension method will be able to remove the object because it uses a custom comparer */
LambdaEqualityComparer <TestDummy, string> comparer = new LambdaEqualityComparer <TestDummy, string>(td => td.TextValue);
bool result = collection.Remove(selectionDummy, comparer);
Assert.IsTrue(result);
Assert.AreEqual(4, collection.Count);
CollectionAssert.Contains(collection, dummyA);
CollectionAssert.DoesNotContain(collection, dummyB1);
CollectionAssert.Contains(collection, dummyC);
CollectionAssert.Contains(collection, dummyD);
CollectionAssert.Contains(collection, dummyB2);
}
public void ConstructorFuncOfTOfint_should_use_default_Equals_and_specified_GetHashCode()
{
// Arrange
var getHashCodeCalled = false;
var equalsCalled = false;
var mock = new MockObject();
mock.GetHashCodeProvider = () => { getHashCodeCalled = true; return(0); };
mock.EqualsProvider = obj => { equalsCalled = true; return(true); };
// Act
var comparer = new LambdaEqualityComparer <MockObject>(_ => 0);
var hashCode = comparer.GetHashCode(mock);
var isEqual = comparer.Equals(mock, mock);
// Assert
Assert.IsFalse(getHashCodeCalled);
Assert.IsTrue(equalsCalled);
Assert.AreEqual(0, hashCode);
Assert.IsTrue(isEqual);
}
public static bool ContainsAny <T>(this IEnumerable <T> source, Func <T, T, bool> comparer, Func <T, int> hasher, params T[] values)
{
if (source == null)
{
throw new ArgumentNullException("source");
}
if (comparer == null)
{
throw new ArgumentNullException("comparer");
}
if (hasher == null)
{
throw new ArgumentNullException("hasher");
}
if (values == null)
{
throw new ArgumentNullException("values");
}
bool result = false;
LambdaEqualityComparer <T> lambdaEqualityComparer = LambdaEqualityComparer.Create(comparer, hasher);
foreach (T value in values)
{
if (source.Contains(value, lambdaEqualityComparer))
{
result = true;
break;
}
}
return(result);
}
public void ConstructorFuncOfTOfObject_should_use_specified_key_equality()
{
// Arrange
var getHashCodeCalled = new List<bool>();
var equalsCalled = new List<bool>();
var mock1 = new MockParent();
mock1.Key.GetHashCodeProvider = () => { getHashCodeCalled.Add(true); return 0; };
mock1.Key.EqualsProvider = obj => { equalsCalled.Add(true); return obj.Equals(null); };
var mock2 = new MockParent();
mock2.Key.GetHashCodeProvider = () => { getHashCodeCalled.Add(true); return 0; };
mock2.Key.EqualsProvider = obj => { equalsCalled.Add(true); return true; };
// Act
var comparer = new LambdaEqualityComparer<MockParent>(_ => _.Key);
var hashCode = comparer.GetHashCode(mock1);
var isEqual = comparer.Equals(mock1, mock2);
// Assert
CollectionAssert.AreEqual(new[] { true }, getHashCodeCalled);
CollectionAssert.AreEqual(new[] { true, true }, equalsCalled);
Assert.AreEqual(0, hashCode);
Assert.IsTrue(isEqual);
}
/// <summary>
/// Проверка полей базовых контентов для UNION на соответствие
/// </summary>
public IEnumerable <RuleViolation> UnionFieldsMatchCheck(List <int> unionSourceContentIds)
{
var contents = ContentRepository.GetList(unionSourceContentIds.Distinct()).ToList();
var contentNames = new Dictionary <int, string>(contents.Count);
foreach (var c in contents)
{
contentNames.Add(c.Id, c.Name);
}
var unionBaseContentFields = VirtualContentRepository.GetFieldsOfContents(unionSourceContentIds);
// Группируем по имени поля
var _ = unionBaseContentFields
//.GroupBy(f => f.Name, new LambdaComparer<string>((s1, s2) => s1.Equals(s2, StringComparison.InvariantCultureIgnoreCase)));
.GroupBy(f => f.Name.ToLowerInvariant());
var result = new List <RuleViolation>();
// Проверяет поля на соответствие
var __ = new LambdaEqualityComparer <Field>(
(f1, f2) =>
{
var violation = СheckUnionMatchedFields(contentNames[f1.ContentId], contentNames[f2.ContentId], f1, f2);
if (violation != null)
{
result.Add(violation);
}
return(true);
},
f => f.Name.ToLowerInvariant().GetHashCode()
);
return(result);
}
public void EqualityComparer()
{
var cmp = new LambdaEqualityComparer <Person>((x, y) =>
x.Name == y.Name &&
x.Age == y.Age &&
x.Sex == y.Sex
);
var dic = new Dictionary <Person, object>(cmp);
var x0 = new Person {
Name = "Mike", Age = 30, Sex = Sex.Male
};
var x1 = new Person {
Name = "Jack", Age = 30, Sex = Sex.Male
};
var x2 = new Person {
Name = "Mike", Age = 30, Sex = Sex.Male
};
dic.Add(x0, new object());
dic.Add(x1, new object());
Assert.That(dic.Count, Is.EqualTo(2));
Assert.That(() => dic.Add(x2, new object()), Throws.TypeOf <System.ArgumentException>());
}
public void TestCase02_TreePropertyAccess()
{
LambdaEqualityComparer <TestDummy, string> comparer = new LambdaEqualityComparer <TestDummy, string>(td => td.Leaf.TextValue);
/* Situation 1: TextValue is equal, leaf.TextValue is equal */
TestDummy dummyA = new TestDummy {
TextValue = "Hello World", Leaf = new SubTestDummy {
TextValue = "Goodmorning"
}
};
TestDummy dummyB = new TestDummy {
TextValue = "Hello World", Leaf = new SubTestDummy {
TextValue = "Goodmorning"
}
};
bool result = comparer.Equals(dummyA, dummyB);
Assert.IsTrue(result);
/* Situation 2: TextValue is equal, leaf.TextValue is not equal */
dummyA = new TestDummy {
TextValue = "Hello World", Leaf = new SubTestDummy {
TextValue = "Goodmorning"
}
};
dummyB = new TestDummy {
TextValue = "Hello World", Leaf = new SubTestDummy {
TextValue = "goodMorning"
}
};
result = comparer.Equals(dummyA, dummyB);
Assert.IsFalse(result);
/* Situation 3: TextValue is equal, first leaf.TextValue is null */
dummyA = new TestDummy {
TextValue = "Hello World", Leaf = new SubTestDummy {
TextValue = null
}
};
dummyB = new TestDummy {
TextValue = "Hello World", Leaf = new SubTestDummy {
TextValue = "Goodmorning"
}
};
result = comparer.Equals(dummyA, dummyB);
Assert.IsFalse(result);
/* Situation 4: TextValue is equal, second leaf.TextValue is null */
dummyA = new TestDummy {
TextValue = "Hello World", Leaf = new SubTestDummy {
TextValue = "Goodmorning"
}
};
dummyB = new TestDummy {
TextValue = "Hello World", Leaf = new SubTestDummy {
TextValue = null
}
};
result = comparer.Equals(dummyA, dummyB);
Assert.IsFalse(result);
/* Situation 5: TextValue is equal, both leaf.TextValues are null */
dummyA = new TestDummy {
TextValue = "Hello World", Leaf = new SubTestDummy {
TextValue = null
}
};
dummyB = new TestDummy {
TextValue = "Hello World", Leaf = new SubTestDummy {
TextValue = null
}
};
result = comparer.Equals(dummyA, dummyB);
Assert.IsTrue(result);
}
public static IEnumerable <TResult> Join <TOuter, TInner, TKey, TResult>(this IEnumerable <TOuter> outer, IEnumerable <TInner> inner, Func <TOuter, TKey> outerKeySelector, Func <TInner, TKey> innerKeySelector, Func <TOuter, TInner, TResult> resultSelector, Func <TKey, TKey, bool> comparer, Func <TKey, int> hasher)
{
if (comparer == null)
{
throw new ArgumentNullException("comparer");
}
if (hasher == null)
{
throw new ArgumentNullException("hasher");
}
return(outer.Join(inner, outerKeySelector, innerKeySelector, resultSelector, LambdaEqualityComparer.Create(comparer, hasher)));
}
public static IEnumerable <TResult> LeftJoin <TLeft, TRight, TKey, TResult>(this IEnumerable <TLeft> left, IEnumerable <TRight> right, Func <TLeft, TKey> leftKeySelector, Func <TRight, TKey> rightKeySelector, Func <TLeft, TRight, TResult> resultSelector, Func <TKey, TKey, bool> comparer, Func <TKey, int> hasher)
{
if (comparer == null)
{
throw new ArgumentNullException("comparer");
}
if (hasher == null)
{
throw new ArgumentNullException("hasher");
}
var groupJoin = left.GroupJoin(right, leftKeySelector, rightKeySelector, (leftElement, rightElements) => new { LeftElement = leftElement, RightElements = rightElements }, LambdaEqualityComparer.Create(comparer, hasher));
return(groupJoin.SelectMany(joinedElement => joinedElement.RightElements.DefaultIfEmpty(), (joinedElement, rightElement) => resultSelector(joinedElement.LeftElement, rightElement)));
}