Lock only if value is same?

Question

If i have an function that edits the database in my webservice that i only want one thread to execute at one time if they try to edit the same row.

void Edit         


        

Answer 1

You can use a ConcurrentDictionary to map each id to an object that you can lock on:

public class Foo
{
    private ConcurrentDictionary dictionary = 
        new ConcurrentDictionary();

    private void EditCheck(long checkid)
    {
        var key = dictionary.GetOrAdd(checkid, new object());
        lock (key)
        {
            //Do stuff with key
        }
    }
}