如果字符串的长度小于15，如何获取字符串的前15个字符或更少的字符？

Question

I tried using this:

 Note = phrase.English.Substring(0, 15);

But this fails if strings are less than 15 in length. Is there a standard way to do this in one statement that would work even if the string length is less than 15.

Answer 1

Make use of ternary operator:

Note = phrase.English.Length > 15? phrase.English.Substring(0, 15):phrase.English;

Or else you can use the extension method Take along with string.Join as like the following :

string  Note = String.Join("",phrase.English.Take(15));

The .Take will take the specified items if present. Here you can check out a working example

Answer 2

I actually created an extension method called Truncate, which I use frequently for this purpose -- mostly to prevent strings larger than the database can handle from being inserted or updated:

    public static string Truncate(this string value, int maxLength)
    {
        if (string.IsNullOrEmpty(value)) return value;
        return value.Length <= maxLength ? value : value.Substring(0, maxLength);
    }

Usage:

string s = "Hello World";
string t = s.Truncate(5);

Answer 3

string one = "12345678901234567890";
string other = string.Join("",one .Take(15));