Check an integer value is Null in c

Question

I have got an integer value and i need to check if it is NULL or not  I got it using a null-coalescing operator  C    public int  Age   if   Age    0   0          do somethig     Now i have to check in a older application where the declaration part is not in ternary  So  how to achieve this without the null-coalescing operator

User · Answer

There is already a correct answer from Adam  but you have another option to refactor your code   if  Age GetValueOrDefault      0           it s null or 0

User · Answer

As stated above     is the null coalescing operator  So the equivalent to   Age    0     0   without using the    operator is    Age HasValue     Age    0     However  there is no version of  Net that has Nullable lt  T   but not     so your statement      Now i have to check in a older application where the declaration part is not in ternary    is doubly invalid

User · Answer

Because int is a ValueType then you can use the following code  if Age    default int     Age    null   or if Age HasValue  amp  amp  Age    0  or if   Age HasValue    Age    0

User · Answer

Nullable lt T gt   or    exposes a HasValue flag to denote if a value is set or the item is null   Also  nullable types support      if  Age    null   The    is the null coalescing operator and doesn t result in a boolean expression  but a value returned   int i   Age    0    So for your example   if  age    null    age    0    Or   if  age GetValueOrDefault 0     0    Or   if   age    0     0    Or ternary   int i   age HasValue   age Value   0

User · Answer

Several things   Age is not an integer - it is a nullable integer type  They are not the same  See the documentation for Nullable lt T gt  on MSDN for details      is the null coalesce operator  not the ternary operator  actually called the conditional operator    To check if a nullable type has a value use HasValue  or check directly against null   if Age HasValue          Yay  it does     if Age    null          It is null

User · Answer

Simply you can do this       public void CheckNull int  item                if  item    null                          Do Something

[c#] Check an integer value is Null in c#

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