C#: How to make sure a settings variable exists before attempting to use it from another assembly?

Question

I have the following:

using CommonSettings = MyProject.Commons.Settings;

public class Foo
{
    public static void DoSomething(string str)
    {
        //How do I make sure that the setting exists first?
        object setting = CommonSettings.Default[str];

        DoSomethingElse(setting);
    }
}

Answer 1

Depending on what type CommomSettings.Default is, a simple null check should be fine:

if(setting != null)
    DoSomethingElse(setting);

If you want to check BEFORE trying to retrieve the setting, you need to post the Type of CommonSettings.Default. It looks like a Dictionary so you might be able to get away with:

if(CommonSettings.Default.ContainsKey(str))
{
    DoSomethingElse(CommonSettings.Default[str]);
}