File.Copy(String, String) is an inbuilt File class method that is used to copy the content of the existing source file content to another destination file which is created by this function.
public static void Copy (string sourceFileName, string destFileName);
Parameter: This function accepts two parameters which are illustrated below:
- sourceFileName: This is the file from where data is copied.
- destFileName: This is the file where data is pasted. This cannot be a existing file or a directory.
- UnauthorizedAccessException: The caller does not have the needed permission.
- ArgumentException: The source filename or destFileName is a zero-length string, contains only white space, or contains one or more invalid characters as defined by InvalidPathChars. OR the sourceFileName or destFileName specifies a directory.
- ArgumentNullException: The sourceFileName or destFileName is null.
- PathTooLongException: The given path, file name, or both exceed the system-defined maximum length.
- DirectoryNotFoundException: The path given in source filename or destFileName is invalid (for example, it is on an unmapped drive).
- FileNotFoundException: The source filename was not found.
- IOException: destFileName exists. OR an I/O error has occurred.
- NotSupportedException: The source file name or destFileName is in an invalid format.
Below are the programs to illustrate the File.Copy(String, String) method.
Program 1: Before running the below code, only source file file.txt was created which is shown below. Below code itself creates a destination file gfg.txt and copies the source file conents to the destination file.
mcs -out:main.exe main.cs mono main.exe Coping process has been done.
After running the above code, above output has been shown and a new destination file gfg.txt created which is shown below:
Program 2: Before running the below code, two file is created with some contents shown below:
mcs -out:main.exe main.cs mono main.exe Could not create file "/home/runner/NutritiousHeavyRegression/gfg.txt". File already exists.
After running the above code, the above error is thrown because the destination file was created before running the program.