CODEWITHSUNDEEP
c#inheritanceruntime
Vaccano
Vaccano

Reputation: 82301

Evaluate if a control is of a parent type at runtime

Is there a way to get code like this print "Test";

DecendedTextBox myControl = new DecendedTextbox();

if (myControl is "TextBox")
{
   Debug.WriteLine("Test");
}

The point here is that I need to see if myControl inherits from a type that I don't have a reference to at Compile Time.

Upvotes: 0

Views: 67

Answers (2)

Chris Sinclair
Chris Sinclair

Reputation: 23208

If you need to avoid pulling the Type reference out via reflection, then you can crawl up the inheritance tree:

public static bool IsTypeSubclassOf(Type subclass, string baseClassFullName)
{
    while (subclass != typeof(object))
    {
        if (subclass.FullName == baseClassFullName)
            return true;
        else
            subclass = subclass.BaseType;
    }
    return false;
}

Upvotes: 1

rossipedia
rossipedia

Reputation: 59367

If you don't have a reference to the type, you can do this:

DecendedTextBox myControl = new DecendedTextbox();

if (myControl.GetType().Name == "TextBox")
{
   Debug.WriteLine("Test");
}

If you want to know the full type name, including namespace, you can use GetType().FullName

As far as checking to see if it inherits from the type, something like this:

DecendedTextBox myControl = new DecendedTextbox();
Type typeToCheck = Type.GetType("TextBox");
if (myControl.GetType().IsSubclassOf(typeToCheck))
{
   Debug.WriteLine("Test");
}

Note that Type.GetType takes an AssemblyQualifiedName, so you'll need to know the full type name.

Upvotes: 1

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