C# Checking if an object can cast to another object fails?

Question

I'm trying to check if an object can cast to a certain type using `IsAssignableFrom`. However I'm not getting the expected results... Am i missing something here? ``` //Works (= casts object) (SomeDerivedType)factory.GetDerivedObject(); //Fails (= returns false) typeof(SomeDerivedType).IsAssignableFrom(factory.GetDerivedObject().GetType()); ``` EDIT: The above example seems wrong and doesn't reflect my problem very well. I have a `DerivedType` object in code which is cast to `BaseType`: ``` BaseType someObject = Factory.GetItem(); //Actual type is DerivedType ``` I also have a `PropertyType` through reflection: ``` PropertyInfo someProperty = entity.GetType().GetProperties().First() ``` I would like to check if `someObject` is assignable to (castable to) the `PropertyType` of `someProperty`. How can I do this?

Accepted Answer

When you have

```
 class B { }
 class D : B {} 
```

then

```
typeof(B).IsAssignableFrom(typeof(D))   // true
typeof(D).IsAssignableFrom(typeof(B))   // false
```

I think you are trying the 2nd form, it's not totally clear.

The simplest answer might be to test:

```
 (factory.GetDerivedObject() as SomeDerivedType) != null
```

After the Edit:

What you want to know is not if someObject is assignable to SomeProperty but if it is castable.

The basis would be:

```
bool ok = someProperty.PropertyType.IsInstanceOfType(someObject);
```

But this only handles inheritance.

C# Checking if an object can cast to another object fails?

Solution

Problem