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Can anyone tell me the difference between FrameworkElement obj = sender as FrameworkElement and FrameworkElement obj = (FrameworkElement) someobject

I am new to Silverlight programming. Can anyone tell me the difference between

FrameworkElement obj=sender as FrameworkElement

and

FrameworkElement obj=(FrameworkElement)someobject
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2 answers 


FrameworkElement obj=sender as FrameworkElement

after this code, obj will be FrameworkElement if its type is FrameworkElement or null otherwise. This code will not throw InvalidCastException .

FrameworkElement obj=(FrameworkElement)sender


this is an explicit conversion and may throw an InvalidCastException

Cast and Type Conversion (C # Programming Guide)

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Yes, the difference

FrameworkElement obj=sender as FrameworkElement

always works. If the sender is not of type FrameworkElement, obj is NULL, otherwise you might find a cast object there.



FrameworkElement obj=(FrameworkElement)someobject

Throws an InvalidCastException if the sender cannot be started to type FrameworkElement.

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