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// Initialize the helper class's fields class1.numToDo = numToDo; class1.squares = new Int32[class1.numToDo]; class1.done = new AutoResetEvent(false); // Do a bunch of tasks on other threads for (Int32 n = 0; n < class1.squares.Length; n++) { if (callback1 == null) { // New up delegate object bound to the helper object and // its anonymous instance method callback1 = new WaitCallback( class1.<UsingLocalVariablesInTheCallbackCode>b__0); } ThreadPool.QueueUserWorkItem(callback1, n); } // Wait for all the other threads to finish class1.done.WaitOne(); // Show the results for (Int32 n = 0; n < class1.squares.Length; n++) Console.WriteLine("Index {0}, Square={1}", n, class1.squares[n]); } // The helper class is given a strange name to avoid potential // conflicts and is private to forbid access from outside AClass [CompilerGenerated] private sealed class <>c__DisplayClass2 : Object { // One public public public public field per local variable used in the callback code Int32[] squares; Int32 numToDo; AutoResetEvent done;
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// public parameterless constructor public <>c__DisplayClass2 { } // Public instance method containing the callback code public void <UsingLocalVariablesInTheCallbackCode>b__0(Object obj) { Int32 num = (Int32) obj; squares[num] = num * num; if (Interlocked.Decrement(ref numToDo) == 0) done.Set(); } } }
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Important Without a doubt, it doesn t take much for programmers to start abusing C# s
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lambda expression feature . When I first started using lambda expressions, it definitely took me some time to get used to them . After all, the code that you write in a method is not actually inside that method, and this also can make debugging and single-stepping through the code a bit more challenging . In fact, I m amazed at how well the Microsoft Visual Studio debugger actually handles stepping through lambda expressions in my source code .
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I ve set up a rule for myself: If I need my callback method to contain more than three lines of code, I will not use a lambda expression; instead, I ll write the method manually and assign it a name of my own creation . But, used judiciously, lambda expressions can greatly increase programmer productivity as well as the maintainability of your code . Below is some code in which using lambda expressions feels very natural . Without them, this code would be tedious to write, harder to read, and harder to maintain:
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// Create an initialize a String array String[] names = { "Jeff", "Kristin", "Aidan", "Grant" }; // Get just the names that have a lowercase 'a' in them. Char charToFind = 'a'; names = Array.FindAll(names, name => name.IndexOf(charToFind) >= 0); // Convert each string's characters to uppercase names = Array.ConvertAll(names, name => name.ToUpper()); // Display the results Array.ForEach(names, Console.WriteLine);
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So far in this chapter, the use of delegates has required the developer to know up front the prototype of the method that is to be called back . For example, if fb is a variable that references a Feedback delegate (see this chapter s first program listing), to invoke the delegate, the code would look like this:
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fb(item); // item is defined as Int32
As you can see, the developer must know when coding how many parameters the callback method requires and the types of those parameters . Fortunately, the developer almost always has this information, so writing code like the preceding code isn t a problem . In some rare circumstances, however, the developer doesn t have this information at compile time . I showed an example of this in 11, Events, when I discussed the EventSet type . In this example, a dictionary maintained a set of different delegate types . At runtime, to raise an event, one of the delegates was looked up in the dictionary and invoked . At compile time, it wasn t possible to know exactly which delegate would be called and which parameters were necessary to pass to the delegate s callback method . Fortunately, System.Delegate offers a few methods that allow you to create and invoke a delegate when you just don t have all the necessary information about the delegate at compile time . Here are the corresponding methods that Delegate defines:
public abstract class Delegate { // Construct a 'type' delegate wrapping the specified static method. public static Delegate CreateDelegate(Type type, MethodInfo method); public static Delegate CreateDelegate(Type type, MethodInfo method, Boolean throwOnBindFailure);
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