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copied!<p>I agree with @Leonardo Garcia Crespo's comment. From what I see here, you only write to the dictionary in the static constructor, which will only be called once per app domain. Everything else is a read and the generic dictionary supports multiple readers if the collection isn't modified. The problem could only lie in the code that's being invoked. It also needs to be thread-safe. Alternatively, you could use another dictionary of associated locks and lock the corresponding lock so that you can only call one non-thread-safe instance at a time.</p> <pre><code>public static class MyClass { public static Dictionary<string,SomeDisposableClass> dict = null; public static Dictionary<string,object> locks = null; static MyClass() { // populate the dictionary locks = new Dictionary<string,object>(); foreach (var key in dict.Keys) { locks[key] = new object(); } } public static void UseDictionary( string name ) { var obj = dict[name]; var sync = locks[name]; lock(sync) { obj.DoSomething(); } } } </code></pre> <p>You could also use a Singleton pattern, but if you only have the one static method that's probably not necessary. I will note that this will be horrible to work around for any code that uses this class.</p> <p>And, yes, I know that it will be single threaded if called 1000 times with the same value for <code>name</code>. If the method that's being called isn't thread-safe, though, that's the best you can do. This way, at least, you can have multiple threads operating for different values of <code>name</code> at the same time since they lock on different objects.</p>

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