C# streamwriter.flush method confusion.

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Hello I tried to understand this page StreamWriter.Flush Method (System.IO) | Microsoft Docs[^]

However, I think I did not get it at all What is the purpose of .Flush() method.

Can Someone please explain to me with plain English why it is important to clear all buffers for the current writer and cause any buffered data to be written to the underlying string?

I also could not understand why there is no need to flush the outputWriter buffers in the ReadAndWriteIntegers method unlike in the ReadAndWriteChars method in the exercise I am attaching below:

Flush — ImgBB[^]

What I have tried:

I have a theoretical question this time. I tried to go over MSDN documentation to understand what is the purpose of .Flush() method.

Thank You!

Posted 11-Mar-22 11:08am

LuckyChloe

Updated 11-Mar-22 11:57am

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Dave Kreskowiak · Accepted Answer · 2022-03-11T11:57:00

It's simple really. When you write to a file, the content may not be immediately written to disk, but instead held in a buffer to be written later. This is for performance reasons.

The downside to this is if the machine crashes or loses power, the data in the buffers waiting to be written is lost.

When you call Flush, those buffers are finally written to disk.