Write To Text File Using Streamwriter C#
A few weeks ago I was tasked with creating a very large CSV file with some dynamic content. I decided that this would be an excellent opportunity to try out some of my C# skills and write the content of the file using a loop. Write a Text File (Example 1) The following code uses the StreamWriter class to open, to write, and to close the text file. In a similar way to the StreamReader class, you can pass the path of a text file to the StreamWriter constructor to open the file automatically. The WriteLine method writes a complete line of text to the text file. How to: Open and Append to a Log File.; 2 minutes to read Contributors. All; In this article. StreamWriter and StreamReader write characters to and read characters from streams. The following code example opens the log.txt file for input, or creates the file if it does not already exist, and appends information to the end of the file. The contents of the file are then written to.
Is true or the buffer is full, and the contents of the buffer cannot be written to the underlying fixed size stream because the is at the end the stream. Remarks This method overrides. The specified characters are written to the underlying stream unless the end of the stream is reached prematurely. If is true, is invoked automatically.
This method might provide faster performance than Write ( char[],``int,``int) because it has fewer arguments to check. For a list of common I/O tasks, see.
C# Streamwriter Write
To write to a text file, you use the StreamWriter instead of the StreamReader. It's used in the same way, though: System.IO. StreamWriter objWriter; objWriter = new System.IO. StreamWriter( file_name ); Here, we're setting up a StreamWriter object and calling it objWriter.
When you create a new StreamWriter object, you hand it the name of a file between the round brackets. Note that if the file is not found, no error will be raised. This is because a file is created if one doesn't exist. Add another button to your form. Double click and type the following code for it (If you prefer, you can add the longer file_name lines, the ones with Environment.GetFolderPath, etc, from a ): Notice the line the does the writing: objWriter.Write( textBox1.Text ); After the dot, use the Write method.
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In between the round brackets of Write, add what it is you want to write to your file. For us, this was the Text in textBox1. We also close the StreamWriter object, after we have finished with it. If you want to write line by line, instead of all at once, use this: objWriter. WriteLine( ); In between the round brackets of WriteLine, you add the line that you want to write to your text file. This is normally done in a loop, and is useful if you have an array of text that you want to write to a file.
Using Streamwriter
Here's a coding example that does just that. We set up an array, and then loop round that array, writing each line to our text file.Try it yourself. The for loop is where we write each line to the text file, adding a carriage return and new line character. Appending text to a file When you use either Write or WriteLine, it will overwrite the current file. So if you click your button twice, it won't add the new text to the end.
It will just erase whatever is already there, and write it again. If you want to add more text to what you already have, then you need to append. This is quite easy, and is done with the StreamWriter line: objWriter = new System.IO.StreamWriter( file_name, true ); Between the round brackets of StreamWriter, and after the file you want to use, you type true to append data to your file. The default is false. And that's it - no need for anything else! Coming up next - How to Copy a file with C#. .
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