Check if the object is NOT of type (! = Equivalent to "IS") - C #

Question

This works great:

protected void txtTest_Load(object sender, EventArgs e) { if (sender is TextBox) {...} } 

Is there any way to check if the sender is NOT textual, some equivalent! = For "is"?

Please do not suggest moving logic to ELSE {} :)

Answer 1

This is one way:

 if (!(sender is TextBox)) {...} 

Answer 2

Could you also make a more detailed "old" way before the is keyword:

 if (sender.GetType() != typeof(TextBox)) { // ... } 

Answer 3

Two well-known ways to do this:

1) Using the IS operator:

 if (!(sender is TextBox)) {...} 

2) Using an AS-operator (useful if you also need to work with an instance of textBox):

 var textBox = sender as TextBox; if (sender == null) {...} 

Answer 4

Try it.

 var cont= textboxobject as Control; if(cont.GetType().Name=="TextBox") { MessageBox.show("textboxobject is a textbox"); } 

Answer 5

If you use type inheritance:

 public class BaseClass {} public class Foo : BaseClass {} public class Bar : BaseClass {} 

... zero stability

 if (obj?.GetType().BaseType != typeof(Bar)) { // ... } 

or

 if (!(sender is Foo)) { //... }