Introduction to C# Commands
C# language is vastly used, to build mobile applications, web applications for windows-based games, and desktop applications. The major advantage of this language is that where an application is written in c# can be deployed in any operating system like windows, ios, android, or cloud platform. It gives an option to break the problem into parts, thus makes the operation easier for the developer. Here, we will go into the details of various commands used in C#.
Before we explore the various commands used in c sharp, let’s understand first what is a Compiler?
What is a Compiler?
We write codes in the high-level programming language, which needs to be translated into a lower-level language or machine language so that it can be easy to execute the program. The compiler does this job. While performing a specific task, if you want to give direction to that program, then you need commands. Keywords, Expressions and Operators, Special Characters, Prior Processing Directives, Compiler Options, Compiler Errors, are some command types used in C sharp.
Commands Types in C#
Below are some command types used in C sharp:
1. Keyword in C sharp
For a compiler, while executing the program, it requires keywords, which hold some special meaning, which works as a predefined identifier. Listed below some reserved identifiers or keywords. Some of them are, false, as, volatile, base, virtual, ushort, readonly, throw, params, delegate, do, unchecked, string, extern, return, interface, internal, is, lock, long, ref, namespace, new, null, object, operator, out, override, stackalloc, private, protected, public, sbyte, sealed, short, sizeof, struct, switch, this, try, ulong, unsafe, using, void, while, True, etc.
Apart from this, we have some contextual keywords, that are used outside the context as an identifier. New keywords are getting added in C sharp. Those programs are written in the older version, to avoid any conflict, all new keywords are added as contextual keywords. Some of them are, by, descending, equals, from, get, group, into, join, let, notnull, on, orderby, remove, select, value, var, with, yield, etc.
2. Expressions and Operators
To perform a logical manipulation or to perform a mathematical calculation, we require some specific symbol that directs the compiler to execute the program. We call them operator or expression. There are some groups in the operator. Some of them are listed below.
- Equality Operators: It checks whether two correspondences are equal or not.
- Shift and Bitwise Operators: For the char type or integral numeric types, this operator performs shift or bitwise operations with the operands. Like binary shift operator, unary operator, etc.
- Boolean Logical Operators: Under the system. boolean structure of .NET, a value of the Boolean can be true or false. For the bool operands, if we perform a logical operation, then we require this operator.
- Comparison Operators: It compares the operators, and it is also known as the relational operator. Like, ‘greater than’, ‘less than’ or ‘equal’ are some examples.
- Arithmetic Operators: With numeric operands, it can perform various arithmetic operations. Like, ‘increment’, ‘decrement’, ‘plus’, ‘minus’, ‘subtraction’, ‘addition’, ‘remainder’, ‘division’, ‘multiplication’ are some examples of this operator.
3. Special Characters
If we need to modify the program element, we need contextual characters or special characters. Like ‘@’ and ‘$’ are the examples. If we prefix @ character before the code element, the compiler would not consider it as a keyword rather it would interpret that as an identifier. If we want to incorporate expressions, then we need to prefix $. The character string is good for manipulating series of characters as a group.
4. Prior Processing Directives
To embed links in C# source code, it provides information about commands of the compiler. This is helpful in conditional compilation while code execution. Like, #if, #define, #elif, #else, #endif, #endregion, #error, #line, #nullable, #pragma, #pragma checksum, #pragma warning, #region, #undef, #warning are some few examples.
5. Compiler Options
It is responsible for .dll and .exe files that are executable. There are two forms in every compiler, ‘/option’ and ‘-option’.
6. Compiler Errors
It contains some code snippets that do explain the cause of the compiler error while executing the program. It would generate an error and also guide how to rectify that problem. It starts from ‘Compiler errors CS0001’ to ‘Compiler errors CS8411’ and starts from ‘Compiler Warning (level 1) CS0420’ to Compiler Warning (level 1) CS8892’.
Basic C# Commands
Below are Some Basic C# Commands:
- ‘#namespace’: If we want to refer or identify various kinds of objects, where we can give a unique name there we need this command. It does not conflict with the same class names which have been declared in another.
- ‘#new’: If we want to create an instance of an object or if we want to create an object we use this command.
- ‘#as’: If we want to check the compatibility of one object type with another then we need this command.
Advanced C# Commands
- ‘#endregion’: While developing big applications, there can be multiple blocks of code. If we want to separate these blocks we can use #region – #endregion.
- ‘async’: Asynchronous is used for asynchronous tasks, which is the only way to use the ‘await’ keyword, thus can only be used within an async method.
- ‘dynamic’: If we want to ignore the compile-time type checking, we need a dynamic type variable. While compilation, the compiler does not check the type of the variable.
Conclusion
With the constant update of frameworks of Microsoft’s .net core, it is always upmarket and ready to support most of the latest techniques to implement. Command gives more control to execute the program effectively. For a beginner, it is always better to start coding with easy commands and implement them. Try to go through the details of each command and its uses, it will save lots of time while developing the application and troubleshoot. It is equally important to understand the project requirement and correctly use commands.
Recommended Articles
This is a guide to C# Commands. Here we discuss the Introduction, various Command types used in C# like Keywords, Expressions and Operators, Compiler Errors, Special Characters, etc. You can also go through our other suggested articles to learn more –