CSharp mimicking JavaScript design pattern
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Simplest C# code so far I can think of equivalent to the JavaScript design pattern to allow private members.
The original JavaScript code can be found here:
http://www.crockford.com/javascript/private.html
For the ease of comparison, the JavaScript code from the above link is also pasted here,
function Container(param) { function dec() { if (secret > 0) { secret -= 1; return true; } else { return false; } } this.member = param; var secret = 3; var that = this; this.service = function () { return dec() ? that.member : null; };}
Following is the equivalent C# code,
class Program{class Container{// delegatesdelegate bool JsPrivateDelegate();public delegate dynamic ServiceDelegate();// constructorpublic Container(dynamic param){var secret = 3;JsPrivateDelegate dec = delegate(){if (secret <= 0) return false;secret--;return true;};Member = param;Service = () => dec() ? Member : null;}public dynamic Member { get; private set; } // public propertypublic ServiceDelegate Service { get; private set; } // public 'method'}static void Main(string[] args){var c = new Container("haha");dynamic s;do{s = c.Service(); // consumes the serviceConsole.WriteLine("{0}", s ?? "<null>");} while (s != null);}}
Note the main point is make private members local variables as long as possible since they are accessible from the closure which C# fully supports. However as a strong-typed language, C# can't get rid of the delegate definition and the local variable definition needs to be in order within a method ('secret' has to come before 'dec').
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