可参考微软。VisualBasic(也处理大写字符串):

string properCase = Strings.StrConv(str, VbStrConv.ProperCase);

在检查null或空字符串值以消除错误后，您可以直接使用这个简单的方法将文本或字符串更改为正确的:

// Text to proper (Title Case):
    public string TextToProper(string text)
    {
        string ProperText = string.Empty;
        if (!string.IsNullOrEmpty(text))
        {
            ProperText = CultureInfo.CurrentCulture.TextInfo.ToTitleCase(text);
        }
        else
        {
            ProperText = string.Empty;
        }
        return ProperText;
    }

MSDN: TextInfo。ToTitleCase

确保你包括:使用系统。全球化

string title = "war and peace";

TextInfo textInfo = new CultureInfo("en-US", false).TextInfo;

title = textInfo.ToTitleCase(title); 
Console.WriteLine(title) ; //War And Peace

//When text is ALL UPPERCASE...
title = "WAR AND PEACE" ;

title = textInfo.ToTitleCase(title); 
Console.WriteLine(title) ; //WAR AND PEACE

//You need to call ToLower to make it work
title = textInfo.ToTitleCase(title.ToLower()); 
Console.WriteLine(title) ; //War And Peace

这是另一种变化。基于这里的几个技巧，我将其简化为以下扩展方法，它非常适合我的目的:

public static string ToTitleCase(this string s) =>
    CultureInfo.InvariantCulture.TextInfo.ToTitleCase(s.ToLower());

对于那些想要自动按下键盘的人，我用下面的VB代码做到了。NET在一个自定义文本框控件上-你显然也可以用一个普通的文本框来做-但是我喜欢通过自定义控件为特定控件添加循环代码的可能性，它适合OOP的概念。

Imports System.Windows.Forms
Imports System.Drawing
Imports System.ComponentModel

Public Class MyTextBox
    Inherits System.Windows.Forms.TextBox
    Private LastKeyIsNotAlpha As Boolean = True
    Protected Overrides Sub OnKeyPress(e As KeyPressEventArgs)
        If _ProperCasing Then
            Dim c As Char = e.KeyChar
            If Char.IsLetter(c) Then
                If LastKeyIsNotAlpha Then
                    e.KeyChar = Char.ToUpper(c)
                    LastKeyIsNotAlpha = False
                End If
            Else
                LastKeyIsNotAlpha = True
            End If
        End If
        MyBase.OnKeyPress(e)
End Sub
    Private _ProperCasing As Boolean = False
    <Category("Behavior"), Description("When Enabled ensures for automatic proper casing of string"), Browsable(True)>
    Public Property ProperCasing As Boolean
        Get
            Return _ProperCasing
        End Get
        Set(value As Boolean)
            _ProperCasing = value
        End Set
    End Property
End Class

我需要一种方法来处理所有大写单词，我喜欢Ricky AH的解决方案，但我进一步将其实现为扩展方法。这避免了必须创建字符数组然后每次显式调用ToArray的步骤-所以你可以只在字符串上调用它，如下所示:

用法:

string newString = oldString.ToProper();

代码:

public static class StringExtensions
{
    public static string ToProper(this string s)
    {
        return new string(s.CharsToTitleCase().ToArray());
    }

    public static IEnumerable<char> CharsToTitleCase(this string s)
    {
        bool newWord = true;
        foreach (char c in s)
        {
            if (newWord) { yield return Char.ToUpper(c); newWord = false; }
            else yield return Char.ToLower(c);
            if (c == ' ') newWord = true;
        }
    }

}