'File.Copy' does not overwrite a file

Using the 开发者_如何转开发following code, I am trying to overwrite a file if it exists. Currenly it throws IOException. How can I fix this problem?

File.Copy(filePath, newPath);

Use

File.Copy(filePath, newPath, true);

The third parameter is overwrite, so if you set it to true the destination file will be overwritten.

See: File.Copy in the MSDN

There is an overload to this function that contains a third parameter. This parameter is called "overwrite". If you pass true, as long as the file is not read-only, it will be overwritten.

Then call the overload

File.Copy(filePath, newPath, true);

From MSDN, you can do:

File.Copy(filePath, newPath, true);

Then use the other File.Copy(string, string, boolean). The third parameter indicates whether or not to overwrite the destination file if it exists (true if you want overwrite, false otherwise).

But what did you expect? If the function is designed to throw when the destination file exists, you need to find a way around that problem. So either:

1. Search the documentation or Intellisense for an overload that does what you are asking.
2. Barring that, create a wrapper around File.Copy(string, string) that deletes the destination file for you if it exists.

This can help you:

I use this and it works,

File.Copy(src,des,true); //(string source, string destination, bool overwrite)

Reference (MSDN): File.Copy Method (String, String, Boolean)

File.Copy(filePath, newPath, bool overwrite)

does it.