何处将常量放在WCF项目中

Question

I am new to WCF, Where do I place the constants for my project?

I generally create a file with a namespace that holds all my static constants. But we cannot have static variables in WCF if the service is per-call or per-session. I don't want magic numbers in my code, I want constants that can be shared through out the project.

Thanks

Answer 1

If they are really constants, you would just put them in the relevant files with const keyword. Constants cannot be changed thefore they are thread safe.

If you need to change the value of a variable, then it's not a constant and you need to think who can change it. If it is a user's responsibility, then you can put variables in a .config file and read them from there. If code needs to change the variables, then you can use some locking mechanism to read/modify the values (lock, ReadWriteLock, etc).

Answer 2

The problem with using const or even classes which wrap magic numbers is that they can't be changed without re-compiling . You want to use a settings file. These aren't very intuitive to set up, so follow these steps. Right-click your project and choose Properties . Then find the Settings tab:

Click the hyperlink which will create a Settings.settings file in your project. You can then edit the values in the designer:

Values are stored in your app.config or web.config (in your case, since it's a WCF project).

Answer 3

Settings files!

http://msdn.microsoft.com/en-us/library/aa730869(v=vs.80).aspx

Answer 4

A Simple static Class with static read only properties should work.

Public static class Foo
{
    public static int Bar { get { return 1337; }}
}