使字符串的第一个字母大写(以最大性能)

我有一个带有文本框的DetailsView 我希望输入的数据总是以大写的第一个字母保存。

例子:

"red" --> "Red"
"red house" --> " Red house"

我怎样才能实现性能最大化呢?

注意:

Based on the answers and the comments under the answers, many people think this is asking about capitalizing all words in the string. E.g. => Red House It isn't, but if that is what you seek, look for one of the answers that uses TextInfo's ToTitleCase method. (Note: Those answers are incorrect for the question actually asked.) See TextInfo.ToTitleCase documentation for caveats (doesn't touch all-caps words - they are considered acronyms; may lowercase letters in middle of words that "shouldn't" be lowered, e.g., "McDonald" → "Mcdonald"; not guaranteed to handle all culture-specific subtleties re capitalization rules.)

注意:

第一个字母之后的字母是否必须小写，这个问题很模糊。公认的答案假定只有第一个字母需要修改。如果要强制字符串中除第一个字母外的所有字母都小写，请查找包含ToLower且不包含ToTitleCase的答案。

当前回答

string input = "red HOUSE";
System.Text.StringBuilder sb = new System.Text.StringBuilder(input);

for (int j = 0; j < sb.Length; j++)
{
    if ( j == 0 ) //catches just the first letter
        sb[j] = System.Char.ToUpper(sb[j]);
    else  //everything else is lower case
        sb[j] = System.Char.ToLower(sb[j]);
}
// Store the new string.
string corrected = sb.ToString();
System.Console.WriteLine(corrected);

2010-11-09 15:33:34

其他回答

public static string ToInvarianTitleCase(this string self)
{
    if (string.IsNullOrWhiteSpace(self))
    {
        return self;
    }

    return CultureInfo.InvariantCulture.TextInfo.ToTitleCase(self);
}

2014-05-11 03:00:10

string emp="TENDULKAR";
string output;
output=emp.First().ToString().ToUpper() + String.Join("", emp.Skip(1)).ToLower();

2013-05-02 11:47:14

最简单和最快的方法是将字符串的第一个字符替换为大写字符:

string str = "test";<br>
str = str.Replace(str[0], char.ToUpper(str[0]));

2013-09-19 10:40:05

string s_Val = "test";
if (s_Val != "")
{
   s_Val  = char.ToUpper(s_Val[0]);
   if (s_Val.Length > 1)
   {
      s_Val += s_Val.Substring(1);
   }
 }

2010-11-09 15:27:04

public string FirstLetterToUpper(string str)
{
    if (str == null)
        return null;

    if (str.Length > 1)
        return char.ToUpper(str[0]) + str.Substring(1);

    return str.ToUpper();
}

旧的回答: 这使得每个首字母都是大写的

public string ToTitleCase(string str)
{
    return CultureInfo.CurrentCulture.TextInfo.ToTitleCase(str.ToLower());
}

2010-11-09 15:39:36

使字符串的第一个字母大写(以最大性能)

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