public void ImmutableRecordsAndWith()
{
var immutableRecord = new ImmutableRecordType {
IntProperty = 42, StringProperty = "foo"
};
//Sometimes you want a copy of an immutable object, but with
//one or more properties changed. You can use a with
//expression to do that.
var newImmutableRecord = immutableRecord with {
IntProperty = 43
};
Assert.That(newImmutableRecord.IntProperty, Is.EqualTo(43));
Assert.That(newImmutableRecord.StringProperty, Is.EqualTo("foo"));
}
public void RecordsDoNotUseDuckTyping()
{
var recordType1 = new MyRecordType {
IntProperty = 42, StringProperty = "foo"
};
var recordType2 = new ImmutableRecordType {
IntProperty = 42, StringProperty = "foo"
};
Assert.That(recordType1.Equals(recordType2), Is.False);
//The compiler already knows that these two records are different types,
//so the following line results in a compiler error.
//Assert.That(recordType1 == recordType2, Is.False);
}
public void ImmutableRecords()
{
var mutableRecord = new MyRecordType {
IntProperty = 42
};
var immutableRecord = new ImmutableRecordType {
IntProperty = 42
};
mutableRecord.IntProperty = 43;
//The following line results in a compiler error.
//immutableRecord.IntProperty = 43;
Assert.That(mutableRecord.IntProperty, Is.EqualTo(43));
Assert.That(immutableRecord.IntProperty, Is.EqualTo(42));
}
