From f1a90a4e636616ce91a271504eee3f374bfd7094 Mon Sep 17 00:00:00 2001 From: Guntbert Reiter Date: Sun, 4 Oct 2015 16:44:24 +0200 Subject: Put demonstrative condition into ternary expression It should be made clear that the part before the ternary operator is indeed a condition, most often created as some comparison expression. --- csharp.html.markdown | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'csharp.html.markdown') diff --git a/csharp.html.markdown b/csharp.html.markdown index 479b7f01..222ba0d2 100644 --- a/csharp.html.markdown +++ b/csharp.html.markdown @@ -236,7 +236,8 @@ on a new line! ""Wow!"", the masses cried"; // Ternary operators // A simple if/else can be written as follows // ? : - string isTrue = (true) ? "True" : "False"; + int toCompare = 17; + string isTrue = toCompare == 17 ? "True" : "False"; // While loop int fooWhile = 0; -- cgit v1.2.3 From 960ee4a1856db8eadb96277bb2422edfa8f2a81c Mon Sep 17 00:00:00 2001 From: Gabriel Halley Date: Wed, 7 Oct 2015 23:11:24 -0400 Subject: removing whitespace all over --- csharp.html.markdown | 56 ++++++++++++++++++++++++++-------------------------- 1 file changed, 28 insertions(+), 28 deletions(-) (limited to 'csharp.html.markdown') diff --git a/csharp.html.markdown b/csharp.html.markdown index 222ba0d2..02650038 100644 --- a/csharp.html.markdown +++ b/csharp.html.markdown @@ -25,7 +25,7 @@ Multi-line comments look like this //public void MethodOrClassOrOtherWithParsableHelp() {} // Specify the namespaces this source code will be using -// The namespaces below are all part of the standard .NET Framework Class Libary +// The namespaces below are all part of the standard .NET Framework Class Libary using System; using System.Collections.Generic; using System.Dynamic; @@ -48,7 +48,7 @@ namespace Learning.CSharp public class LearnCSharp { // BASIC SYNTAX - skip to INTERESTING FEATURES if you have used Java or C++ before - public static void Syntax() + public static void Syntax() { // Use Console.WriteLine to print lines Console.WriteLine("Hello World"); @@ -371,11 +371,11 @@ on a new line! ""Wow!"", the masses cried"; // // INTERESTING FEATURES // - + // DEFAULT METHOD SIGNATURES public // Visibility - static // Allows for direct call on class without object + static // Allows for direct call on class without object int // Return Type, MethodSignatures( int maxCount, // First variable, expects an int @@ -383,7 +383,7 @@ on a new line! ""Wow!"", the masses cried"; int another = 3, params string[] otherParams // captures all other parameters passed to method ) - { + { return -1; } @@ -400,8 +400,8 @@ on a new line! ""Wow!"", the masses cried"; // The classes for TKey and TValue is specified by the user calling this function. // This method emulates the SetDefault of Python public static TValue SetDefault( - IDictionary dictionary, - TKey key, + IDictionary dictionary, + TKey key, TValue defaultItem) { TValue result; @@ -410,7 +410,7 @@ on a new line! ""Wow!"", the masses cried"; return result; } - // You can narrow down the objects that are passed in + // You can narrow down the objects that are passed in public static void IterateAndPrint(T toPrint) where T: IEnumerable { // We can iterate, since T is a IEnumerable @@ -450,13 +450,13 @@ on a new line! ""Wow!"", the masses cried"; // GENERICS // - var phonebook = new Dictionary() { + var phonebook = new Dictionary() { {"Sarah", "212 555 5555"} // Add some entries to the phone book }; // Calling SETDEFAULT defined as a generic above Console.WriteLine(SetDefault(phonebook, "Shaun", "No Phone")); // No Phone - // nb, you don't need to specify the TKey and TValue since they can be + // nb, you don't need to specify the TKey and TValue since they can be // derived implicitly Console.WriteLine(SetDefault(phonebook, "Sarah", "No Phone")); // 212 555 5555 @@ -491,26 +491,26 @@ on a new line! ""Wow!"", the masses cried"; // DISPOSABLE RESOURCES MANAGEMENT - let you handle unmanaged resources easily. // Most of objects that access unmanaged resources (file handle, device contexts, etc.) - // implement the IDisposable interface. The using statement takes care of + // implement the IDisposable interface. The using statement takes care of // cleaning those IDisposable objects for you. using (StreamWriter writer = new StreamWriter("log.txt")) { writer.WriteLine("Nothing suspicious here"); // At the end of scope, resources will be released. // Even if an exception is thrown. - } + } // PARALLEL FRAMEWORK // http://blogs.msdn.com/b/csharpfaq/archive/2010/06/01/parallel-programming-in-net-framework-4-getting-started.aspx - var websites = new string[] { - "http://www.google.com", "http://www.reddit.com", + var websites = new string[] { + "http://www.google.com", "http://www.reddit.com", "http://www.shaunmccarthy.com" }; var responses = new Dictionary(); - + // Will spin up separate threads for each request, and join on them // before going to the next step! - Parallel.ForEach(websites, + Parallel.ForEach(websites, new ParallelOptions() {MaxDegreeOfParallelism = 3}, // max of 3 threads website => { @@ -534,7 +534,7 @@ on a new line! ""Wow!"", the masses cried"; (introduceTo) => string.Format("Hey {0}, this is {1}", student.FirstName, introduceTo)); Console.WriteLine(student.Introduce("Beth")); - // IQUERYABLE - almost all collections implement this, which gives you a lot of + // IQUERYABLE - almost all collections implement this, which gives you a lot of // very useful Map / Filter / Reduce style methods var bikes = new List(); bikes.Sort(); // Sorts the array @@ -556,8 +556,8 @@ on a new line! ""Wow!"", the masses cried"; // ASPARALLEL // And this is where things get wicked - combines linq and parallel operations var threeWheelers = bikes.AsParallel().Where(b => b.Wheels == 3).Select(b => b.Name); - // this will happen in parallel! Threads will automagically be spun up and the - // results divvied amongst them! Amazing for large datasets when you have lots of + // this will happen in parallel! Threads will automagically be spun up and the + // results divvied amongst them! Amazing for large datasets when you have lots of // cores // LINQ - maps a store to IQueryable objects, with delayed execution @@ -575,9 +575,9 @@ on a new line! ""Wow!"", the masses cried"; .Select(b => b.Name); // still no query run // Now the query runs, but opens a reader, so only populates are you iterate through - foreach (string bike in query) + foreach (string bike in query) Console.WriteLine(result); - + } @@ -629,7 +629,7 @@ on a new line! ""Wow!"", the masses cried"; private set; // You can set modifiers on the get/set methods } - int _speed; // Everything is private by default: Only accessible from within this class. + int _speed; // Everything is private by default: Only accessible from within this class. // can also use keyword private public string Name { get; set; } @@ -676,7 +676,7 @@ on a new line! ""Wow!"", the masses cried"; // Constructors are a way of creating classes // This is a default constructor - public Bicycle() + public Bicycle() { this.Gear = 1; // you can access members of the object with the keyword this Cadence = 50; // but you don't always need it @@ -688,13 +688,13 @@ on a new line! ""Wow!"", the masses cried"; // This is a specified constructor (it contains arguments) public Bicycle(int startCadence, int startSpeed, int startGear, - string name, bool hasCardsInSpokes, BikeBrand brand) + string name, bool hasCardsInSpokes, BikeBrand brand) : base() // calls base first { - Gear = startGear; + Gear = startGear; Cadence = startCadence; _speed = startSpeed; - Name = name; + Name = name; _hasCardsInSpokes = hasCardsInSpokes; Brand = brand; } @@ -857,7 +857,7 @@ on a new line! ""Wow!"", the masses cried"; } /// - /// Used to connect to DB for LinqToSql example. + /// Used to connect to DB for LinqToSql example. /// EntityFramework Code First is awesome (similar to Ruby's ActiveRecord, but bidirectional) /// http://msdn.microsoft.com/en-us/data/jj193542.aspx /// @@ -882,7 +882,7 @@ on a new line! ""Wow!"", the masses cried"; * ASP.NET Web Forms (old) * WebMatrix (tool) * Desktop Development - * Windows Presentation Foundation (WPF) (new) + * Windows Presentation Foundation (WPF) (new) * Winforms (old) ## Further Reading -- cgit v1.2.3 From d97eaa51d279f24dddbc820aab10ec3cb2e90e69 Mon Sep 17 00:00:00 2001 From: Chris Date: Sat, 10 Oct 2015 20:52:59 -0700 Subject: Added detail on C# single inheritance Clarified that the base class name must be the first thing listed --- csharp.html.markdown | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'csharp.html.markdown') diff --git a/csharp.html.markdown b/csharp.html.markdown index 02650038..a4dff948 100644 --- a/csharp.html.markdown +++ b/csharp.html.markdown @@ -837,7 +837,8 @@ on a new line! ""Wow!"", the masses cried"; bool Broken { get; } // interfaces can contain properties as well as methods & events } - // Class can inherit only one other class, but can implement any amount of interfaces + // Class can inherit only one other class, but can implement any amount of interfaces, however + // the base class name must be the first in the list and all interfaces follow class MountainBike : Bicycle, IJumpable, IBreakable { int damage = 0; -- cgit v1.2.3 From 5bbd8419b232bff0baae40506351f733e0e30462 Mon Sep 17 00:00:00 2001 From: Chris Date: Sat, 10 Oct 2015 22:25:39 -0700 Subject: Added info C# null-propagation Another tool I found useful when learning C# --- csharp.html.markdown | 3 +++ 1 file changed, 3 insertions(+) (limited to 'csharp.html.markdown') diff --git a/csharp.html.markdown b/csharp.html.markdown index 02650038..14ffe4e0 100644 --- a/csharp.html.markdown +++ b/csharp.html.markdown @@ -443,6 +443,9 @@ on a new line! ""Wow!"", the masses cried"; // ?? is syntactic sugar for specifying default value (coalesce) // in case variable is null int notNullable = nullable ?? 0; // 0 + + // ?. is an operator for null-propogation - a shorthand way of checking for null + nullable?.Print(); // Use the Print() extension method if nullable isn't null // IMPLICITLY TYPED VARIABLES - you can let the compiler work out what the type is: var magic = "magic is a string, at compile time, so you still get type safety"; -- cgit v1.2.3 From 51f7c4f6a015666794dc46ec080c80813d4ac57e Mon Sep 17 00:00:00 2001 From: Jo Pearce Date: Mon, 12 Oct 2015 14:07:56 +0100 Subject: Fixed the custom indexer example (setter return type is void) --- csharp.html.markdown | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'csharp.html.markdown') diff --git a/csharp.html.markdown b/csharp.html.markdown index 479b7f01..72ee3731 100644 --- a/csharp.html.markdown +++ b/csharp.html.markdown @@ -749,7 +749,7 @@ on a new line! ""Wow!"", the masses cried"; // It's also possible to define custom Indexers on objects. // All though this is not entirely useful in this example, you - // could do bicycle[0] which yields "chris" to get the first passenger or + // could do bicycle[0] which returns "chris" to get the first passenger or // bicycle[1] = "lisa" to set the passenger. (of this apparent quattrocycle) private string[] passengers = { "chris", "phil", "darren", "regina" }; @@ -760,7 +760,7 @@ on a new line! ""Wow!"", the masses cried"; } set { - return passengers[i] = value; + passengers[i] = value; } } -- cgit v1.2.3 From 0cea1d25d5d103eb9774cf3f3e1362a11b2e684d Mon Sep 17 00:00:00 2001 From: Jo Pearce Date: Mon, 12 Oct 2015 15:15:06 +0100 Subject: Added some simple yield examples --- csharp.html.markdown | 39 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 38 insertions(+), 1 deletion(-) (limited to 'csharp.html.markdown') diff --git a/csharp.html.markdown b/csharp.html.markdown index 72ee3731..8babb90a 100644 --- a/csharp.html.markdown +++ b/csharp.html.markdown @@ -6,6 +6,7 @@ contributors: - ["Melvyn Laïly", "http://x2a.yt"] - ["Shaun McCarthy", "http://www.shaunmccarthy.com"] - ["Wouter Van Schandevijl", "http://github.com/laoujin"] + - ["Jo Pearce", "http://github.com/jdpearce"] filename: LearnCSharp.cs --- @@ -417,6 +418,42 @@ on a new line! ""Wow!"", the masses cried"; // Item is an int Console.WriteLine(item.ToString()); } + + // YIELD + // Usage of the "yield" keyword indicates that the method it appears in is an Iterator + // (this means you can use it in a foreach loop) + public static IEnumerable YieldCounter(int limit = 10) + { + for (var i = 0; i < limit; i++) + yield return i; + } + + // which you would call like this : + public static void PrintYieldCounterToConsole() + { + foreach (var counter in YieldCounter()) + Console.WriteLine(counter); + } + + // you can use more than one "yield return" in a method + public static IEnumerable ManyYieldCounter() + { + yield return 0; + yield return 1; + yield return 2; + yield return 3; + } + + // you can also use "yield break" to stop the Iterator + // this method would only return half of the values from 0 to limit. + public static IEnumerable YieldCounterWithBreak(int limit = 10) + { + for (var i = 0; i < limit; i++) + { + if (i > limit/2) yield break; + yield return i; + } + } public static void OtherInterestingFeatures() { @@ -875,7 +912,7 @@ on a new line! ""Wow!"", the masses cried"; ## Topics Not Covered * Attributes - * async/await, yield, pragma directives + * async/await, pragma directives * Web Development * ASP.NET MVC & WebApi (new) * ASP.NET Web Forms (old) -- cgit v1.2.3 From ad5b0a615b6dd6857de6d2055c1a2743bd340d83 Mon Sep 17 00:00:00 2001 From: Cameron Wood Date: Tue, 13 Oct 2015 17:03:26 -0400 Subject: [csharp/en] Fix for a few spelling errors Fixed a few typos and spelling errors in the C# documentation --- csharp.html.markdown | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'csharp.html.markdown') diff --git a/csharp.html.markdown b/csharp.html.markdown index 28da9fe5..7aca2c6f 100644 --- a/csharp.html.markdown +++ b/csharp.html.markdown @@ -160,7 +160,7 @@ on a new line! ""Wow!"", the masses cried"; // List = new List(); List intList = new List(); List stringList = new List(); - List z = new List { 9000, 1000, 1337 }; // intialize + List z = new List { 9000, 1000, 1337 }; // initialize // The <> are for generics - Check out the cool stuff section // Lists don't default to a value; @@ -460,7 +460,7 @@ on a new line! ""Wow!"", the masses cried"; { // OPTIONAL PARAMETERS MethodSignatures(3, 1, 3, "Some", "Extra", "Strings"); - MethodSignatures(3, another: 3); // explicity set a parameter, skipping optional ones + MethodSignatures(3, another: 3); // explicitly set a parameter, skipping optional ones // BY REF AND OUT PARAMETERS int maxCount = 0, count; // ref params must have value @@ -481,7 +481,7 @@ on a new line! ""Wow!"", the masses cried"; // in case variable is null int notNullable = nullable ?? 0; // 0 - // ?. is an operator for null-propogation - a shorthand way of checking for null + // ?. is an operator for null-propagation - a shorthand way of checking for null nullable?.Print(); // Use the Print() extension method if nullable isn't null // IMPLICITLY TYPED VARIABLES - you can let the compiler work out what the type is: @@ -650,7 +650,7 @@ on a new line! ""Wow!"", the masses cried"; { return _cadence; } - set // set - define a method to set a proprety + set // set - define a method to set a property { _cadence = value; // Value is the value passed in to the setter } -- cgit v1.2.3 From 4e0db77a0c3cc4483b3b5f4f81d306869eef656a Mon Sep 17 00:00:00 2001 From: "chris@chriszimmerman.net" Date: Thu, 15 Oct 2015 20:37:29 -0400 Subject: Added information about out parameters in C#. --- csharp.html.markdown | 2 ++ 1 file changed, 2 insertions(+) (limited to 'csharp.html.markdown') diff --git a/csharp.html.markdown b/csharp.html.markdown index 7aca2c6f..c32fb9f3 100644 --- a/csharp.html.markdown +++ b/csharp.html.markdown @@ -7,6 +7,7 @@ contributors: - ["Shaun McCarthy", "http://www.shaunmccarthy.com"] - ["Wouter Van Schandevijl", "http://github.com/laoujin"] - ["Jo Pearce", "http://github.com/jdpearce"] + - ["Chris Zimmerman", "https://github.com/chriszimmerman"] filename: LearnCSharp.cs --- @@ -394,6 +395,7 @@ on a new line! ""Wow!"", the masses cried"; ref int maxCount, // Pass by reference out int count) { + //the argument passed in as 'count' will hold the value of 15 outside of this function count = 15; // out param must be assigned before control leaves the method } -- cgit v1.2.3 From 6a173cb28d6b2565e63fd3e0c05e6627043ba48b Mon Sep 17 00:00:00 2001 From: "chris@chriszimmerman.net" Date: Thu, 15 Oct 2015 20:39:37 -0400 Subject: Fixed spacing. --- csharp.html.markdown | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'csharp.html.markdown') diff --git a/csharp.html.markdown b/csharp.html.markdown index c32fb9f3..26d4dffc 100644 --- a/csharp.html.markdown +++ b/csharp.html.markdown @@ -395,8 +395,8 @@ on a new line! ""Wow!"", the masses cried"; ref int maxCount, // Pass by reference out int count) { - //the argument passed in as 'count' will hold the value of 15 outside of this function - count = 15; // out param must be assigned before control leaves the method + //the argument passed in as 'count' will hold the value of 15 outside of this function + count = 15; // out param must be assigned before control leaves the method } // GENERICS -- cgit v1.2.3 From 0671147741c186d27ae055fdceea71b06ec94f20 Mon Sep 17 00:00:00 2001 From: "chris@chriszimmerman.net" Date: Thu, 15 Oct 2015 20:41:22 -0400 Subject: Fixed more spacing issues. --- csharp.html.markdown | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'csharp.html.markdown') diff --git a/csharp.html.markdown b/csharp.html.markdown index 26d4dffc..59f3e42b 100644 --- a/csharp.html.markdown +++ b/csharp.html.markdown @@ -395,8 +395,8 @@ on a new line! ""Wow!"", the masses cried"; ref int maxCount, // Pass by reference out int count) { - //the argument passed in as 'count' will hold the value of 15 outside of this function - count = 15; // out param must be assigned before control leaves the method + //the argument passed in as 'count' will hold the value of 15 outside of this function + count = 15; // out param must be assigned before control leaves the method } // GENERICS -- cgit v1.2.3 From d65e738fc339c7b1481dc88cb1c39d1ec8777b6d Mon Sep 17 00:00:00 2001 From: Andrew Backes Date: Thu, 15 Oct 2015 23:26:57 -0500 Subject: [csharp/eng] Partial Classes example --- csharp.html.markdown | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) (limited to 'csharp.html.markdown') diff --git a/csharp.html.markdown b/csharp.html.markdown index 7aca2c6f..d62dadec 100644 --- a/csharp.html.markdown +++ b/csharp.html.markdown @@ -911,6 +911,35 @@ on a new line! ""Wow!"", the masses cried"; public DbSet Bikes { get; set; } } + + // Classes can be split across multiple .cs files + // A1.cs + public partial class A + { + public static void A1() + { + Console.WriteLine("Method A1 in class A"); + } + } + + // A2.cs + public partial class A + { + public static void A2() + { + Console.WriteLine("Method A2 in class A"); + } + } + + // Program using the partial class "A" + public class Program + { + static void Main() + { + A.A1(); + A.A2(); + } + } } // End Namespace ``` -- cgit v1.2.3 From 9f510f3044138429ce616c390e42d8e0b6ceb2df Mon Sep 17 00:00:00 2001 From: "chris@chriszimmerman.net" Date: Sat, 17 Oct 2015 19:50:09 -0400 Subject: Fixed indentation in csharp file. --- csharp.html.markdown | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'csharp.html.markdown') diff --git a/csharp.html.markdown b/csharp.html.markdown index 59f3e42b..31c0417e 100644 --- a/csharp.html.markdown +++ b/csharp.html.markdown @@ -395,8 +395,8 @@ on a new line! ""Wow!"", the masses cried"; ref int maxCount, // Pass by reference out int count) { - //the argument passed in as 'count' will hold the value of 15 outside of this function - count = 15; // out param must be assigned before control leaves the method + //the argument passed in as 'count' will hold the value of 15 outside of this function + count = 15; // out param must be assigned before control leaves the method } // GENERICS -- cgit v1.2.3