C# programs are compiled into IL by the compiler and then executed by the runtime, including JIT compilation, garbage collection and exception handling. You can run C# programs through the console, Windows Forms, or Web applications. The runtime loads the assembly, creates a program instance, calls the Main() method, and exits when complete.
The running mechanism of C# language
C# is an object-oriented programming language that uses a compiler to Source code is converted into executable code. Here's how to run a C# program:
Compile
When you compile C# code using a C# compiler (such as Visual Studio or dotnet CLI), the compiler does the following Steps:
- Syntax Check: The compiler checks the code for syntax errors.
- Type checking: The compiler checks whether the types in the code are compatible.
- Generate Intermediate Language (IL): The compiler compiles C# code into IL, which is a low-level virtual instruction.
Runtime
Compiled IL code is executed by a runtime called the Common Language Runtime (CLR). The CLR performs the following steps:
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Just-In-Time Compilation (JIT): The CLR's JIT compiler compiles IL code into native code that can be executed directly by the computer.
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Garbage Collection (GC): CLR automatically manages memory and releases the memory occupied by objects that are no longer used.
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Exception handling: The CLR handles exceptions that occur when code is executed and provides detailed information about the exception type.
Running a C# program
You can run a C# program using the following method:
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Console application: The program runs in the console and allows the user to input and output data.
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Windows Forms Application: A program creates a graphical user interface (GUI) in which a user can interact.
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Web application: The program is hosted on a web server and can be accessed by users through a browser.
When you run a C# program, the CLR performs the following steps:
- Load the compiled assembly.
- Create an instance of the program.
- Call the Main() method of the program, which is the entry point of the program.
- Run the code in the Main() method.
- Exit when the program completes or an exception occurs.
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