Simple writer with files3/12/2023 ![]() Note, this method is for writing to a file synchronously. This could be useful if you wish to create a settings file on the disk, for example. In this tutorial, you learned how to use a StreamWriter object to write a string to a text file. ![]() using (StreamWriter outputFile = new StreamWriter(filePath, true)) The second argument will be a bool variable. To append, that is to say to write a string to the end of the file, is as simple as passing a second argument to the constructor. NET Framework includes a number of constructors for the StreamWriter class, and one of these allows us to append to the file instead. The way we have declared the StreamWriter object on Line 14 above will do just that. The default action for the StreamWriter class is to overwrite the contents of the file when it already exists. These are similar to the Write() and WriteLine() methods of the Console class. This examples uses the WriteLine() method, but the StreamWriter class also includes a Write() method that will not include a newline character. Line 16 will write the string Free C# tutorials at (declared on Line 12) to the file specified on Line 10. In this case, it properly disposes of the StreamWriter object once the file write operation is complete. The using keyword ensures that the Dispose() method of the referenced object is called, even if an exception occurs. Note the use of the using statement on Line 14. By passing the filePath variable as an argument to the StreamWriter class, StreamWriter will create and write to the file in that location. On Line 14, the StreamWriter object is initiated. string filePath = Path.Combine(Environment.GetFolderPath(), "WriteFile.txt") ![]() The following snippet is a better way to write Line 10 above, because the code becomes compatible across different machines. You can also use your system's environment variables to dynamically reference known folders. Note, if you include only a filename ("WriteFile.txt") and not a full directory path, the file will be written in the project folder. If the file does not exist, the StreamWriter object will create it. On Line 10, we have declared the path to the file we wish to write to. Using (StreamWriter outputFile = new StreamWriter(filePath)) String filePath = content = "Free C# tutorials at " Once the object is instantiated, you can use it to write content to the file. To create an instance of a StreamWriter object, you must define the location and filename of the file you wish to write. To use the StreamWriter object, you must include the System.IO directive in your project. You can also use StreamWriter to append text to an existing file and to write to a file asynchronously. In this tutorial, you will learn how to use StreamWriter to write a string to a file synchronously. The write() method only accepts content without formatting options so it's similar to print(), but can't format Strings.To write to a text file in C#, you will use a StreamWriter object. Writer.write( "From me, you can buy apples and oranges") Writer.write( "Welcome to my fruit store\n") Alternatively, you can do this with the try-with-resources syntax: try(FileWriter writer = new FileWriter( "output.txt")) Writer.write( "This text was written with a FileWriter") Īfter using the writer, it's important to flush and close the resources. Then, we simply use the FileWriter instance to write to it: File output = new File( "output.txt") įileWriter writer = new FileWriter(output) We'll create a File instance and pass it into the FileWriter constructor to "bridge" them. FileWriterįileWriter is one of the simplest ways to write some textual contents into a file. There is no need to close any resources since we haven't opened any resources ourselves.
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