Reading and Writing Files

There are a few easy to use function to read and write files:

  • System.IO.File.WiteAllText
  • System.IO.File.AppendAllText
  • System.IO.File.ReadAllText
  • System.IO.File.ReadAllLines

With these files you can write a whole file, append to an existing file, read the full content of a file as a string or as an array of strings. There are several other functions in the same namespace but those are the functions I use most.

Lets say that we want to write the contents of a string to a file. The following would do this.

System.IO.File.WriteAllText(_filePath, "The Contents", System.Text.Encoding.UTF8)

To append text to a file you could do the following.

System.IO.File.AppendAllText(_filePath, _"Add another line.  This is line " & count.ToString & _System.Environment.NewLine, System.Text.Encoding.UTF8)

To read a full file into one string variable you could do. Dim fileContent As String = System.IO.File.ReadAllText(_filePath)

If you want to read a file line by line you can do

For Each line As String In System.IO.File.ReadAllLines(_filePath)


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