Writing to the file

The third parameter specifies Unicode , so that StreamWriter encodes the file in Unicode format. You can also specify the following encoding methods for the third parameter:.

It's useful when you want to write one character at a time. On the File menu, point to New , and then click Project. This code creates a file that is named Test1. Open Test1. For all file manipulations, it's good programming practice to wrap the code inside a try-catch-finally block to handle errors and exceptions. Specifically, you may want to release handles to the file in the final block so that the file isn't locked indefinitely. Some possible errors include a file that doesn't exist, or a file that is already in use.

The fputs writes the string pointed to by str to the stream pointed to by stream. On successful completion ,it returns 0 else EOF. The fgetc function will write byte specified by c to the output stream pointed to by stream.

On successful completion, fputc will return the value it has written, else EOF character will be returned. The fwrite function is used to write data can contain multiple characters and multiple lines to a file. However, if your app uses a large amount of state data, consider using streams to directly store your data. This can help reduce the delay introduced by the transactional model of the Write methods.

For an example, see the BasicSuspension sample. The following is a pseudo-code example on how to retry a write C , assuming the write is to be done after the user picks a file for saving:.

The Parallel Programming with. NET blog is a great resource for guidance about parallel programming. In particular, the post about AsyncReaderWriterLock describes how to maintain exclusive access to a file for writes while allowing concurrent read access. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Please rate your experience Yes No. Any additional feedback? Note This article focuses on the FileIO methods in examples and discussions.

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