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In regards to why are closures mutable in C#, you have to ask, "Do you want simplicity (Java), or power with complexity (C#)?" Mutable closures allow you to define once and reuse. Example: <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ClosureTest { class Program { static void Main(string[] args) { string userFilter = "C"; IEnumerable<string> query = (from m in typeof(String).GetMethods() where m.Name.StartsWith(userFilter) select m.Name.ToString()).Distinct(); while(userFilter.ToLower() != "q") { DiplayStringMethods(query, userFilter); userFilter = GetNewFilter(); } } static void DiplayStringMethods(IEnumerable<string> methodNames, string userFilter) { Console.WriteLine("Here are all of the String methods starting with the letter \"{0}\":", userFilter); Console.WriteLine(); foreach (string methodName in methodNames) Console.WriteLine(" * {0}", methodName); } static string GetNewFilter() { Console.WriteLine(); Console.Write("Enter a new starting letter (type \"Q\" to quit): "); ConsoleKeyInfo cki = Console.ReadKey(); Console.WriteLine(); return cki.Key.ToString(); } } } </code></pre> If you do not want to define once and reuse, because you are worried about unintended consequences, you can simply use a copy of the variable. Change the above code as follows: <pre><code> string userFilter = "C"; string userFilter_copy = userFilter; IEnumerable<string> query = (from m in typeof(String).GetMethods() where m.Name.StartsWith(userFilter_copy) select m.Name.ToString()).Distinct(); </code></pre> Now the query will return the same result, regardless of what <code>userFilter</code> equals. Jon Skeet has an excellent introduction to <a href="http://csharpindepth.com/Articles/Chapter5/Closures.aspx" rel="nofollow noreferrer">the differences between Java and C# closures</a>.
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1. POAre there any good reasons why closures aren't immutable in C#?
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1. USBrandon S
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