C＃中的java.lang.Long

Question

I'm developing a WCF JSON Web Service which receive data from an Android application.

Some data could be null. On Android I'm using java.lang.Long , that could be null .

On C#side, I'm using long that couldn't be null .

Is there a java.lang.Long type in C#?

Answer 1

Sounds like you want a Nullable<long> or long? .

long? myLongVar = null;
if (myLongVar == null) // or !myLongVar.HasValue, if you prefer
{
    myLongVar = 5L;
    long noLongerNullable = myLongVar.Value;
}

Answer 2

在C＃中使用Nullable类型

Long? x;//by default x is now null..you can now assign null to it

Answer 3

You should use long? aka Nullable<long>