To create and run a console application
Start Visual Studio 2012/2015/2017.
- On the menu bar, choose File, New, Project.
The New Project dialog box opens.
- Expand Installed, expand Templates, expand Visual C#, and then choose Console Application.
- In the Name box, specify a name for your project, and then choose the OK button.
The new project appears in Solution Explorer.
- If Program.cs isn't open in the Code Editor, open the shortcut menu for Program.cs in Solution Explorer, and then choose View Code.
- Replace the contents of Program.cs with the following code.
7. Choose the F5 key to run the project. A Command Prompt window appears that contains the line
Hello World!
Next, the important parts of this program are examined.
The first line contains a comment. The characters //
convert the rest of the line to a comment.
You can also comment out a block of text by enclosing it between the /*
and */
characters. This is shown in the following example.
Main Method
A C# console application must contain a Main
method, in which control starts and ends. The Main
method is where you create objects and execute other methods.
The Main
method is a static method that resides inside a class or a struct. In the previous "Hello World!" example, it resides in a class named Hello
. You can declare the Main
method in one of the following ways:
It can also return an integer.
With either of the return types, it can take arguments.
-or-
The parameter of the Main
method, args
, is a string
array that contains the command-line arguments used to invoke the
program. Unlike in C++, the array does not include the name of the
executable (exe) file.
The call to ReadKey at the end of the Main
method prevents the console window from closing before you have a
chance to read the output when you run your program in debug mode, by
pressing F5.
C# programs generally use the input/output services provided by the run-time library of the .NET Framework. The statement System.Console.WriteLine("Hello World!");
uses the WriteLine method. This is one of the output methods of the Console class in the run-time library. It displays its string parameter on the standard output stream followed by a new line. Other Console methods are available for different input and output operations. If you include the using System;
directive at the beginning of the program, you can directly use the System classes and methods without fully qualifying them. For example, you can call Console.WriteLine
instead of System.Console.WriteLine
:
For more information about input/output methods, see System.IO.
Command-Line Compilation and Execution
You can compile the "Hello World!" program by using the command line
instead of the Visual Studio Integrated Development Environment (IDE).
To compile and run from a command prompt
Paste the code from the preceding procedure into any text editor, and then save the file as a text file. Name the file Hello.cs
. C# source code files use the extension .cs
.
Perform one of the following steps to open a command-prompt window:
In Windows 10, on the Start menu, search for Developer Command Prompt
, and then tap or choose Developer Command Prompt for VS 2017.
A Developer Command Prompt window appears.
In Windows 7, open the Start menu, expand the folder for the current version of Visual Studio, open the shortcut menu for Visual Studio Tools, and then choose Developer Command Prompt for VS 2017.
A Developer Command Prompt window appears.
Enable command-line builds from a standard Command Prompt window.
In the command-prompt window, navigate to the folder that contains your Hello.cs
file.
Enter the following command to compile Hello.cs
.
csc Hello.cs
If your program has no compilation errors, an executable file that is named Hello.exe
is created.
In the command-prompt window, enter the following command to run the program:
Hello
1 Comments
thanks for further details contact me on facebook
ReplyDeleteThanks for Commenting on our blogs, we will revert back with answer of your query.
EmojiThanks & Regards
Sonu Yadav