如何将字符串中所有单词的首字母大写？

Question

首先,我的所有城市都以大写形式返回,因此我将它们切换为小写.我怎样才能将第一个字母作为大写字母？谢谢你的帮助!

List<string> cities = new List<string>();

foreach (DataRow row in dt.Rows)
{
    cities.Add(row[0].ToString().ToLower());

    **ADDED THIS BUT NOTHING HAPPENED**
     CultureInfo.CurrentCulture.TextInfo.ToTitleCase(row[0] as string);
}

return cities;

Answer 1

使用TextInfo.ToTitleCase方法:

System.Globalization.TextInfo.ToTitleCase();

来自MSDN示例的一点,修改为使用OP的代码:

// Defines the string with mixed casing.
string myString = row[0] as String;

// Creates a TextInfo based on the "en-US" culture.
TextInfo myTI = new CultureInfo("en-US", false).TextInfo;

// Retrieve a titlecase'd version of the string.
string myCity = myTI.ToTitleCase(myString);

全部在一行:

string myCity = new CultureInfo("en-US", false).TextInfo.ToTitleCase(row[0] as String);

Answer 2

正则表达式可能看起来有点长，但是有效

List<string> cities = new List<string>();

foreach (DataRow row in dt.Rows)
{
    string city = row[0].ToString();
    cities.Add(String.Concat(Regex.Replace(city, "([a-zA-Z])([a-zA-Z]+)", "$1").ToUpper(System.Globalization.CultureInfo.InvariantCulture), Regex.Replace(city, "([a-zA-Z])([a-zA-Z]+)", "$2").ToLower(System.Globalization.CultureInfo.InvariantCulture)));

}

return cities;