What Is 'Long?' Data Type?
I Am Going over Some Code Written by Another Developer and Am Not Sure What Long? Means: Protected String Accounttologin(Long? Id) { String loginName = ""; If...
I am going over some code written by another developer and am not sure what long? means:
protected string AccountToLogin(long? id)
{
string loginName = "";
if (id.HasValue)
{
try
{....
6 Answers
long is the same as Int64
The ? means it is nullable
A nullable type can represent the normal range of values for its underlying value type, plus an additional null value
Nullable example:
int? num = null;
if (num.HasValue == true)
{
System.Console.WriteLine("num = " + num.Value);
}
else
{
System.Console.WriteLine("num = Null");
}
This allows you to actually check for a null value instead of trying to assign an arbitrary value to something to check to see if something failed.
I actually wrote a blog post about this here.
"long?" is a nullable 64-bit signed integer. It's equivalent to Nullable<Int64>.
long? is a 64-bit, nullable integer.
To clarify, nullable means it can be null or an integer number ( 0, 1, etc.).
long? is a nullable type. This means that the id parameter can have a long value or be set to null. Have a look at the HasValue and Value properties of this parameter.
It's a nullable type declaration.
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