diff options
| -rw-r--r-- | csharp.html.markdown | 43 |
1 files changed, 35 insertions, 8 deletions
diff --git a/csharp.html.markdown b/csharp.html.markdown index 47dd9683..8eda5356 100644 --- a/csharp.html.markdown +++ b/csharp.html.markdown @@ -18,13 +18,15 @@ C# is an elegant and type-safe object-oriented language that enables developers Multi-line comments look like this */ /// <summary> -/// This is an XML documentation comment +/// This is an XML documentation comment which can be used to generate external +/// documentation or provide context help within an IDE /// </summary> +//public void MethodOrClassOrOtherWithParsableHelp() {} // Specify namespaces application will be using using System; using System.Collections.Generic; -using System.Data.Entity; +using System.Data.Entity; // Add dll reference with NuGet: Install-Package EntityFramework using System.Dynamic; using System.Linq; using System.Linq.Expressions; @@ -33,7 +35,7 @@ using System.Threading.Tasks; using System.IO; // defines scope to organize code into "packages" -namespace Learning +namespace LearningXInYMinutes.CSharp { // Each .cs file should at least contain a class with the same name as the file // you're allowed to do otherwise, but shouldn't for sanity. @@ -125,7 +127,7 @@ on a new line! ""Wow!"", the masses cried"; // Use const or read-only to make a variable immutable // const values are calculated at compile time - const int HOURS_I_WORK_PER_WEEK = 9001; + const int HoursWorkPerWeek = 9001; /////////////////////////////////////////////////// // Data Structures @@ -242,8 +244,15 @@ on a new line! ""Wow!"", the masses cried"; int fooDoWhile = 0; do { - //Iterated 100 times, fooDoWhile 0->99 + // Start iteration 100 times, fooDoWhile 0->99 + if (false) + continue; // skip the current iteration + fooDoWhile++; + + if (fooDoWhile == 50) + break; // breaks from the loop completely + } while (fooDoWhile < 100); //for loop structure => for(<start_statement>; <conditional>; <step>) @@ -301,7 +310,7 @@ on a new line! ""Wow!"", the masses cried"; // Converting data // Convert String To Integer - // this will throw an Exception on failure + // this will throw a FormatException on failure int.Parse("123");//returns an integer version of "123" // try parse will default to type default on failure @@ -315,6 +324,11 @@ on a new line! ""Wow!"", the masses cried"; Convert.ToString(123); // or tryInt.ToString(); + + // Casting + // Cast decimal 15 to a int + // and then implicitly cast to long + long x = (int) 15M; } /////////////////////////////////////// @@ -367,6 +381,15 @@ on a new line! ""Wow!"", the masses cried"; } // Methods can have the same name, as long as the signature is unique + // A method that differs only in return type is not unique + public static void MethodSignatures( + ref int maxCount, // Pass by reference + out int count) + { + count = 15; // out param must be assigned before control leaves the method + } + + // Methods can have the same name, as long as the signature is unique public static void MethodSignatures(string maxCount) { } @@ -400,6 +423,10 @@ on a new line! ""Wow!"", the masses cried"; MethodSignatures(3, 1, 3, "Some", "Extra", "Strings"); MethodSignatures(3, another: 3); // explicity set a parameter, skipping optional ones + // BY REF AND OUT PARAMETERS + int maxCount = 0, count; // ref params must have value + MethodSignatures(ref maxCount, out count); + // EXTENSION METHODS int i = 3; i.Print(); // Defined below @@ -682,7 +709,7 @@ on a new line! ""Wow!"", the masses cried"; // All though this is not entirely useful in this example, you // could do bicycle[0] which yields "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" } + private string[] passengers = { "chris", "phil", "darren", "regina" }; public string this[int i] { @@ -784,7 +811,7 @@ on a new line! ""Wow!"", the masses cried"; /// EntityFramework Code First is awesome (similar to Ruby's ActiveRecord, but bidirectional) /// http://msdn.microsoft.com/en-us/data/jj193542.aspx /// </summary> - public class BikeRepository : DbSet + public class BikeRepository : DbContext { public BikeRepository() : base() |