public void ToDerivedOnBaseDoesNotReturnDerivedInstance()
{
A c1AsA = C1.Create();
B result = c1AsA.ToB();
Assert.NotSame(c1AsA, result);
Assert.IsType <B>(result); // should not retain C1 as its type
}
public void ToBaseType()
{
C1 c1 = C1.Create(1, 2, 3);
A a = c1.ToA();
Assert.IsType(typeof(A), a); // should not be a derived type.
Assert.Equal(1, a.Field1);
}
public void ToSiblingType()
{
C1 c1 = C1.Create(1, 2, 3);
C2 c2 = c1.ToC2();
Assert.Equal(1, c2.Field1);
Assert.Equal(2, c2.Field2);
Assert.Equal(0, c2.Field3); // different field between types
c2 = c1.ToC2(4);
Assert.Equal(1, c2.Field1);
Assert.Equal(2, c2.Field2);
Assert.Equal(4, c2.Field3);
}
public virtual C1 ToC1(
ImmutableObjectGraph.Optional <System.Int32> field3 = default(ImmutableObjectGraph.Optional <System.Int32>))
{
C1 that = this as C1;
if (that != null && this.GetType().IsEquivalentTo(typeof(C1)))
{
if ((!field3.IsDefined || field3.Value == that.Field3))
{
return(that);
}
}
return(C1.Create(
field1: this.Field1,
field2: this.Field2,
field3: field3));
}