5 ways to write to a file with C# .NET

It’s a common scenario that you need to write some content to a file. Here you see 5 ways to achieve that.

1. Using a FileStream:

private void WriteToAFileWithFileStream()
{
	using (FileStream target = File.Create(@"c:\mydirectory\target.txt"))
	{
		using (StreamWriter writer = new StreamWriter(target))
		{
			writer.WriteLine("Hello world");
		}
	}
}

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Reading from a memory-mapped file in C# .NET

In this post we saw how to write to a memory-mapped file in .NET. We wrote a short string – “Here comes some log message.” – to a 10KB file. Here we’ll quickly look at how to read from the same file by mapping it into memory first.

The way to read from a file is very similar to writing to it. We’ll still need the MemoryMappedFile and MemoryMappedViewAccessor objects:

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Writing to a file using a MemoryMappedFile in C# .NET

You can use memory-mapped files to map a file to a place in memory that multiple processes can access. The necessary objects reside in the System.IO.MemoryMappedFiles namespace.

The following example will create a MemoryMappedFile object using the following ingredients:

• The file path
• The file mode which in this example is CreateNew, i.e. a new file will be created if it doesn’t exist
• A map name that other processes can refer to
• An initial size of the file. This is mandatory for files that don’t exist otherwise you’ll get an exception. The file will be given this initial size with a lot of string-termination characters. If you try to open the file in a text editor then you may get a warning that the file is full of NULL characters. This depends on the type of editor you’re using

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