问题
I'm working on my Window Application and i'm using some static members.
public class MyParameter
{
public static string connectionString = "...";
}
Now if I install my application on computer and open two instance of same application. Will 'connectionString' common to the two instances?? Or every instance has its connectionString ?
回答1:
The variable static or not is a part of your application memory. When you open 2 instances of your application you create two distinct memory locations in the OS, so there is not any relation between those 2 variables at all.
If you want to create one (relation), you have to look on different IPC (Inter Process Communication) methods available in OS, like:
- Memory Mapped Files
- Named Pipes
- IPC Mechanisms in C# - Usage and Best Practices
回答2:
No, Each application instance are isolated from one another using AppDomain. Thus each application instance will run in a seperate AppDomain and cannot access the variables from other domain. To do communicate with different domain we need to use Remoting , WCF Service
回答3:
Every instance.
Static members are allocated on a per AppDomain basis. If you were to spawn a new AppDomain from within your current one.. they would be different.
来源：https://stackoverflow.com/questions/17272544/static-members-behavior-with-multiple-instance-of-application-c-sharp