How can I Unescape and Reescape strings in .net?

问题

I need a TextBox on a WPF control that can take in text like Commit\r\n\r (which is the .net string "Commit\\r\\n\\r") and convert it back to "Commit\r\n\r" as a .net string. I was hoping for a string.Unescape() and string.Escape() method pair, but it doesn't seem to exist. Am I going to have to write my own? or is there a more simple way to do this?

回答1:

System.Text.RegularExpressions.Regex.Unescape(@"\r\n\t\t\t\t\t\t\t\t\tHello world!")

Regex.Unescape method documentation

回答2:

Hans's code, improved version.

Made it use StringBuilder - a real performance booster on long strings

Made it an extension method

public static class StringUnescape
{
    public static string Unescape(this string txt)
    {
        if (string.IsNullOrEmpty(txt)) { return txt; }
        StringBuilder retval = new StringBuilder(txt.Length);
        for (int ix = 0; ix < txt.Length; )
        {
            int jx = txt.IndexOf('\\', ix);
            if (jx < 0 || jx == txt.Length - 1) jx = txt.Length;
            retval.Append(txt, ix, jx - ix);
            if (jx >= txt.Length) break;
            switch (txt[jx + 1])
            {
                case 'n': retval.Append('\n'); break;  // Line feed
                case 'r': retval.Append('\r'); break;  // Carriage return
                case 't': retval.Append('\t'); break;  // Tab
                case '\\': retval.Append('\\'); break; // Don't escape
                default:                                 // Unrecognized, copy as-is
                    retval.Append('\\').Append(txt[jx + 1]); break;
            }
            ix = jx + 2;
        }
        return retval.ToString();
    }
}

回答3:

Following methods are same as javascript escape/unescape functions:

Microsoft.JScript.GlobalObject.unescape();

Microsoft.JScript.GlobalObject.escape();

来源：https://stackoverflow.com/questions/2661169/how-can-i-unescape-and-reescape-strings-in-net

标签

.net

string

escaping