IS vs AS Keyword | C# Interview Questions with Answers | Csharp Interview Questions | IS vs AS in C#

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This is a interesting c# interview question which explains the difference between "IS" and "AS" keyword.
"IS" keyword is useful to check if objects are compatible with a type while "AS" keyword helps to do conversion from one type to other type
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#DifferenceBetweenIS&AS #ISvsASKeyword #IS&ASKeywordinC# #CSharpInterviewQuestions #C#InterviewQuestionsforFreshers #C#Tutorial

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[@AlbrechtJ]

This channel is one of the best C# teacher. Very clear explanation.

[@Game-vi6if]

The is and as operators in C# verify whether the specified interface is implemented or not. The is
operator is used to check the compatibility between two types or classes. It returns a boolean value
based on the check operation performed. On the other hand, the as operator returns null if the two
types or classes are not compatible with each other.

[@harikrishnanr4794]

Most underrated UA-camr i have ever seen.

[@Bmaster3234]

Great video, quick and to the point.

[@GumbieUsaGames]

More specific ans would be
Is = returns a "bool" on checking the type
As = like a cast , converts a type

[@jackbennett6164]

Really helpful! Thank you very much man.

[@musabalriani550]

Thanks so much.

[@pratiksingh896]

impacted video

[@sivarajnagarajan9410]

thanks a lot

[@questpondvideos]

IS vs AS keyword of C# explained ( C# interview question with answers)
Thanks to www.questpond.com to create this video

[@tksvel1]

Good explanation. Thank you.

[@bhargavstumpy9674]

When i write object [] arrdata = dict["data"] as object []; It returns me null.. But it returned values in some other code I've written.. Don't know the reason.

[@kirandeepsingh9144]

What is real use of is and as operator. Here we already know str1 is of string type then what is use to check it?

[@TheSachin12300]

can you Explain :
ClassA{
}
ClassB{
public static void Main(String args[])
{
ClassA objA=new ClassA();
ClassB objB=objA as ClassB;
}
}
is it run successfully or throw compile error and why ? Error? Or will it copy all references in object ClassB?

[@iuriikryvenko3775]

So probably it is better to use 'as' and then check the result for null.
If we use 'is', first we check if the value is a string (try to cast to string) and when if the result will be true, we need to cast it once more to string.
var result = value as string;
if (result !=null){ .... }
if(value is string)
{
var result = (string)value;
}

[@hhcdghjjgsdrt235]

genius

[@Thallnor93]

so what's a difrent between casting and keyword "as"?

[@Layarion]

i have the same question.

[@jashneaaftabi]

IS keyword only checks strings??

[@gkmishra2009]

one interface have 10 method and in class A we want to use 5 method and another 5 method in class B how we achieve

[@yadavivek19]

Create 2 interface

[@khizar511]

As keyword can not type cast to not nullable datatypes.
object obj1 = 1234;
int num1 = obj1 as int; // compile time error "The as operator must be used with a reference type or nullable types"

[@FirstLast-ws7zw]

+Khizar Javed Not only that it will not work if your as "type" is different than the type you are trying to cast to.
object x = 44;
string str = x as 'int';

[@Tall-Cool-Drink]

hmmm.... why not convert 1234 to "1234" when using "as"?

[@ek6065]

shi sharp