C＃File.ReadallText做了奇怪的事情

Question

What I'm trying do is read all the text in a file and if it contains the word "Share" do a regex. Here is the code:

DirectoryInfo dinfo = new DirectoryInfo(@"C:\Documents and Settings\g\Desktop\123");
        FileInfo[] Files = dinfo.GetFiles("*.txt");
        foreach (FileInfo filex in Files)
        {
            string contents = File.ReadAllText(filex.FullName);
            string matchingcontants = "Share";
            if (contents.Contains(matchingcontants))
            {
                string sharename = Regex.Match(contents, @"\+(\S*)(.)(.*)(.)").Groups[3].Value;
                File.AppendAllText(@"C:\sharename.txt", sharename + @"\r\n");
            }

        }

When I debug I get... contents = "\\r\\0\\n\\0=\\0=\\0=\\0=\\0=\\0=\\0=\\0=\\0=\\0=\\0=\\0=\\0=\\0=\\0=\\0=\\0=\\0=\\0=\\0=\\0=\\0=\\0=\\0=\\0=\\0=\\0=\\0=\\0=\\0\\r\\0\\n\\0+\\0S\\0h\\0a\\0r\\0e\\0 \\0\\\\0\\\\0j\\05\\02\\0\\\\0w\\0w\\0w\\0_\\0O\\0n\\0t\\

\\0S\\0h\\0a\\0r\\0e\\

Not Share. Any hints? tips or suggestions?

Answer 1

Looks like you've got a file which is saved as UTF-16 (ie Encoding.Unicode ). Read the file with the right encoding, and all should be well.

Fortunately there's an overload of File.ReadAllText which takes an encoding:

string contents = File.ReadAllText(filex.FullName, Encoding.Unicode);

Unfortunately, that will then do the wrong thing for files which aren't in UTF-16. While there are heuristic ways of guessing the encoding, ideally you should know the encoding before you open the file.

Answer 2

看起来它是一个Unicode文件，并且您尝试将其作为纯ASCII读取。

Answer 3

我的猜测是编码设置不正确，您可能需要使用指定编码的ReadAllText（String，Encoding）。