你需要通过将它们加倍来转义(逐字串字面量):

string str = @"""How to add doublequotes""";

或者对于普通的字符串，你可以用\:

string str = "\"How to add doublequotes\"";

另注:

    string path = @"H:\\MOVIES\\Battel SHIP\\done-battleship-cd1.avi";
    string hh = string.Format("\"{0}\"", path);
    Process.Start(@"C:\Program Files (x86)\VideoLAN\VLC\vlc.exe ", hh + " ,--play");

hh的实际值，正如传递的那样，将是"H:\MOVIES\ batttel SHIP\done-battleship-cd1.avi"。

当需要双双字面值时，使用:@"H:\MOVIES\ batttel SHIP\done-battleship-cd1.avi";

而不是:@"H:\ moviesbatttel SHIP\done-battleship-cd1.avi";

因为第一个字面值是路径名，第二个字面值是双引号。

如果你必须经常这样做，并且你想让代码更干净，你可能会喜欢有一个扩展方法。

这是非常明显的代码，但我仍然认为它可以帮助您节省时间。

  /// <summary>
    /// Put a string between double quotes.
    /// </summary>
    /// <param name="value">Value to be put between double quotes ex: foo</param>
    /// <returns>double quoted string ex: "foo"</returns>
    public static string AddDoubleQuotes(this string value)
    {
        return "\"" + value + "\"";
    }

然后你可以在你喜欢的每个字符串上调用foo. adddoublequotes()或"foo". adddoublequotes()。

在c# 11.0预览版中，你可以使用原始字符串字面值。

Raw string literals are a new format for string literals. Raw string literals can contain arbitrary text, including whitespace, new lines, embedded quotes, and other special characters without requiring escape sequences. A raw string literal starts with at least three double-quote (""") characters. It ends with the same number of double-quote characters. Typically, a raw string literal uses three double quotes on a single line to start the string, and three double quotes on a separate line to end the string.

string str = """
    "How to add double quotes"
    """;

使用

&dquo
<div>&dquo"+ title +@"&dquo</div>

或者转义双引号:

\"
<div>\""+ title +@"\"</div>

如果我理解你的问题，也许你可以试试这个:

string title = string.Format("<div>\"{0}\"</div>", "some text");