File.WriteAllText(String, String) Method in C# with Examples
File.WriteAllText(String, String) is an inbuilt File class method that is used to create a new file, writes the specified string to the file, and then closes the file. If the target file already exists, it is overwritten.
public static void WriteAllText (string path, string contents);
Parameter: This function accepts two parameters which are illustrated below:
- path: This is the specified file where specified string are going to be written.
- contents: This is the specified string to write to 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.
- 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.WriteAllText(String, String) method.
Program 1: Initially, no file was created. Below code itself create a file file.txt and write the specified string array into the file.
After running the above code, the above output is shown, and a new file file.txt is created shown below-
Program 2: Initially, a file file.txt is created with some contents shown below-
Below code overwrites the file contents with the specified string.
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After running the above code, the above output is shown, and the file file.txt contents became like shown below: