c# - 分词应用

Question

此应用程序应该采用 Pascal 大小写的字符串:

HelloHowAreYou?

然后将单词分开形成一个句子，只保留第一个字母大写:

你好，你好吗？

截至目前，此代码仅在每个单词以不同字母作为星号时才有效。例句 HelloHowAreYou 结果是 hellohow are you?

为什么要这样做？

    private void btnSeparate_Click(object sender, EventArgs e)
    {
        // Get the sentence from the text box
        string sentence = txtWords.Text;
        int upperCase; // to hold the index of an uppercase letter

        foreach (char up in sentence)
        {

            if (char.IsUpper(up))
            {

                // Find the index of the uppercase letter
                upperCase = sentence.IndexOf(up);

                // Insert a space at the appropriate index
                sentence = sentence.Insert(upperCase, " ");
            }
        }
        // Make all the letters lowercase
        sentence = sentence.ToLower();
        // Capitalize the first letter of the sentence.
        sentence = sentence[1].ToString().ToUpper() + sentence.Substring(2);

        // Display the separeted words
        lblSeparatedWords.Text = sentence;

    }
}

Answer 1

这对你有用吗:

var test = "HelloHowAreYou";
var final = "";
bool firstCharacterCheckIsDone = false;
foreach (char c in test)
{
    if (char.IsUpper(c))
    {
        if (test.IndexOf(c) == 0 && !firstCharacterCheckIsDone)
        {
            final += " " + c.ToString();
            firstCharacterCheckIsDone = true;
        }
        else
            final += " " + c.ToString().ToLower();
    }
    else
        final += c.ToString();
}

Console.WriteLine(final.Trim());

输出:

Hello how are you

查看Fiddle

---

在您的示例中，H 在 Hello 和 How 中重复，您没有获得所需的输出。

你可以从我上面的解决方案中创建一个方法:

public static void Main()
{
    Console.WriteLine(FinalOutput("HelloHowAreYou?"));  
}

static string FinalOutput(string test)
{
    var final = "";
    bool firstCharacterCheckIsDone = false;
    foreach (char c in test)
    {
        if (char.IsUpper(c))
        {
            if (test.IndexOf(c) == 0 && !firstCharacterCheckIsDone)
            {
                final += " " + c.ToString();

                //This here will make sure only first character is in Upper case
                //doesn't matter if the same character is being repeated elsewhere
                firstCharacterCheckIsDone = true; 
            }
            else
                final += " " + c.ToString().ToLower();
        }
        else
            final += c.ToString();
    }

    return final.Trim();
}

输出:

Hello how are you?

查看Fiddle