Tutorial by Examples: b

string requestUri = "http://www.example.com"; string requestBodyString = "Request body string."; string contentType = "text/plain"; string requestMethod = "POST"; byte[] responseBody; byte[] requestBodyBytes = Encoding.UTF8.GetBytes(requestBodyS...

The finally { ... } block of a try-finally or try-catch-finally will always execute, regardless of whether an exception occurred or not (except when a StackOverflowException has been thrown or call has been made to Environment.FailFast()). It can be utilized to free or clean up resources acquired i...

var persons = new[] { new {Id = 1, Name = "Foo"}, new {Id = 2, Name = "Bar"}, new {Id = 3, Name = "Fizz"}, new {Id = 4, Name = "Buzz"} }; var personsSortedByName = persons.OrderBy(p => p.Name); Console.WriteLine(string.Join(&quo...

var persons = new[] { new {Id = 1, Name = "Foo"}, new {Id = 2, Name = "Bar"}, new {Id = 3, Name = "Fizz"}, new {Id = 4, Name = "Buzz"} }; var personsSortedByNameDescending = persons.OrderByDescending(p => p.Name); Console.WriteL...

var persons = new[] { new { Name="Fizz", Job="Developer"}, new { Name="Buzz", Job="Developer"}, new { Name="Foo", Job="Astronaut"}, new { Name="Bar", Job="Astronaut"}, }; var groupedByJob = person...

using System; using BasicStuff = System; using Sayer = System.Console; using static System.Console; //From C# 6 class Program { public static void Main() { System.Console.WriteLine("Ignoring usings and specifying full type name"); Console.WriteLine(&quot...

using System; using System.IO; using System.Net; using System.Net.Sockets; using System.Text; class TcpChat { static void Main(string[] args) { if(args.Length == 0) { Console.WriteLine("Basic TCP chat"); Console.WriteLine(); ...

Using the null-coalescing operator (??) allows you to specify a default value for a nullable type if the left-hand operand is null. string testString = null; Console.WriteLine("The specified string is - " + (testString ?? "not provided")); Live Demo on .NET Fiddle This is l...

using is syntactic sugar that allows you to guarantee that a resource is cleaned up without needing an explicit try-finally block. This means your code will be much cleaner, and you won't leak non-managed resources. Standard Dispose cleanup pattern, for objects that implement the IDisposable interf...

Apostrophes char apostrophe = '\''; Backslash char oneBackslash = '\\';

Backslash // The filename will be c:\myfile.txt in both cases string filename = "c:\\myfile.txt"; string filename = @"c:\myfile.txt"; The second example uses a verbatim string literal, which doesn't treat the backslash as an escape character. Quotes string text = "\&...

try { /* code that could throw an exception */ } catch (Exception ex) { /* handle the exception */ } Note that handling all exceptions with the same code is often not the best approach. This is commonly used when any inner exception handling routines fail, as a last resort.

You are allowed to create and throw exceptions in your own code. Instantiating an exception is done the same way that any other C# object. Exception ex = new Exception(); // constructor with an overload that takes a message string Exception ex = new Exception("Error message"); Yo...

try { /* code that could throw an exception */ } catch (Exception) { /* handle the exception */ } finally { /* Code that will be executed, regardless if an exception was thrown / caught or not */ } The try / catch / finally block can be very handy when reading from files. ...

// assign string from a string literal string s = "hello"; // assign string from an array of characters char[] chars = new char[] { 'h', 'e', 'l', 'l', 'o' }; string s = new string(chars, 0, chars.Length); // assign string from a char pointer, derived from a string string s; uns...

// assigning a signed short to its minimum value short s = -32768; // assigning a signed short to its maximum value short s = 32767; // assigning a signed int to its minimum value int i = -2147483648; // assigning a signed int to its maximum value int i = 2147483647; // assigning a s...

// assigning an unsigned short to its minimum value ushort s = 0; // assigning an unsigned short to its maximum value ushort s = 65535; // assigning an unsigned int to its minimum value uint i = 0; // assigning an unsigned int to its maximum value uint i = 4294967295; // assigning an...

public class SomeClass { public void DoStuff() { } protected void DoMagic() { } } public static class SomeClassExtensions { public static void DoStuffWrapper(this SomeClass someInstance) { someInstance.DoStuff(); // ok ...

Assemblies are the building block of any Common Language Runtime (CLR) application. Every type you define, together with its methods, properties and their bytecode, is compiled and packaged inside an Assembly. using System.Reflection; Assembly assembly = this.GetType().Assembly; Assembl...

using System; using System.IO; using System.Linq; using System.Net.Http; using System.Threading.Tasks; class HttpGet { private static async Task DownloadAsync(string fromUrl, string toFile) { using (var fileStream = File.OpenWrite(toFile)) { using (va...