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Keywords are predefined, reserved identifiers with special meaning to the compiler. They cannot be used as identifiers in your program without the @ prefix. For example @if is a legal identifier but not the keyword if. C# has a predefined collection of "keywords" (or reserved words) ...

public void SomeMethod <T> () { } public void SomeMethod<T, V>() { } public T SomeMethod<T>(IEnumerable<T> sequence) { ... } public void SomeMethod<T>() where T : new() { } public void SomeMethod<T, V>() where T : new() where V : struct { } public void Som...

Reflection is a C# language mechanism for accessing dynamic object properties on runtime. Typically, reflection is used to fetch the information about dynamic object type and object attribute values. In REST application, for example, reflection could be used to iterate through serialized response ob...

class DerivedClass : BaseClass class DerivedClass : BaseClass, IExampleInterface class DerivedClass : BaseClass, IExampleInterface, IAnotherInterface Classes can inherit directly from only one class, but (instead or at the same time) can implement one or more interfaces. Structs can imp...

There are several kinds of collection: Array List Queue SortedList Stack Dictionary

Do not use the XmlSerializer to parse HTML. For this, special libraries are available like the HTML Agility Pack

The currently relevant HTTP/1.1 RFCs are: 7230: Message Syntax and Routing 7231: Semantics and Content 7232: Conditional Requests 7233: Range Requests 7234: Caching 7235: Authenticaion 7239: Forwarded HTTP Extension 7240: Prefer Header for HTTP There's also the following informational...

Related: MSDN: Exceptions and Exception Handling (C# Programming Guide) MSDN: Handling and Throwing Exceptions MSDN: CA1031: Do not catch general exception types MSDN: try-catch (C# Reference)

LINQ (Language Integrated Query) is an expression that retrieves data from a data source. LINQ simplifies this situation by offering a consistent model for working with data across various kinds of data sources and formats. In a LINQ query, you are always working with objects. You use the same basic...

See also: HTTP Clients

var result = possibleNullObject ?? defaultValue; ParameterDetailspossibleNullObjectThe value to test for null value. If non null, this value is returned. Must be a nullable type.defaultValueThe value returned if possibleNullObject is null. Must be the same type as possibleNullObject. The n...

Provides a convenient syntax that ensures the correct use of IDisposable objects. using (disposable) { } using (IDisposable disposable = new MyDisposable()) { } The object in the using statement must implement the IDisposable interface. using(var obj = new MyObject()) { } class M...

\' — single quote (0x0027) \" — double quote (0x0022) \\ — backslash (0x005C) \0 — null (0x0000) \a — alert (0x0007) \b — backspace (0x0008) \f — form feed (0x000C) \n — new line (0x000A) \r — carriage return (0x000D) \t — horizontal tab (0x0009) \v — vertical tab (0x000B) \u0000 ...

X?.Y; //null if X is null else X.Y X?.Y?.Z; //null if X is null or Y is null else X.Y.Z X?[index]; //null if X is null else X[index] X?.ValueMethod(); //null if X is null else the result of X.ValueMethod(); X?.VoidMethod(); //do nothing if X is null else call X.VoidMethod(); Note that w...

NuGet.org: NuGet is the package manager for the Microsoft development platform including .NET. The NuGet client tools provide the ability to produce and consume packages. The NuGet Gallery is the central package repository used by all package authors and consumers. Images in examples courtes...

A lambda expression is a syntax for creating anonymous functions inline. More formally, from the C# Programming Guide: A lambda expression is an anonymous function that you can use to create delegates or expression tree types. By using lambda expressions, you can write local functions that can ...