File.WriteAllBytes() Method in C# with Examples
File.WriteAllBytes(String) is an inbuilt File class method that is used to create a new file then writes the specified byte array to the file and then closes the file. If the target file already exists, it is overwritten.
public static void WriteAllBytes (string path, byte bytes);
Parameter: This function accepts two parameters which are illustrated below:
- path: This is the specified file where the byte array is going to be written.
- bytes: This is the specified bytes that are going to be written into the file.
- ArgumentException: The path is a zero-length string, contains only white space, or one or more invalid characters as defined by InvalidPathChars.
- ArgumentNullException: The path is null or the byte array is empty.
- PathTooLongException: The specified path, file name, or both exceed the system-defined maximum length.
- DirectoryNotFoundException: The specified path is invalid.
- IOException: An I/O error occurred while opening the file.
- UnauthorizedAccessException: The path specified a file that is read-only. OR the path specified a file that is hidden. OR this operation is not supported on the current platform. OR the path specified a directory. OR the caller does not have the required permission.
- NotSupportedException: The path is in an invalid format.
- SecurityException: The caller does not have the required permission.
Below are the programs to illustrate the File.WriteAllBytes(String, Byte) method.
Program 1: Initially, no file was created. Below code, itself creates a file file.txt and writes some specified byte array and then finally close the file.
The data has been written to the file.
Above code gives the output as shown above and creates a file with some specified contents shown below-
Program 2: Initially, a file was created with some contents shown below:
Below code, overwrites the above file contents with a specified byte array data.
The data has been overwritten to the file.
After running above code, the above output is shown and the file contents get overwritten which is shown below-