如何从richtextbox中计算c＃中的字符数

Question

好吧，基本上我在这里要完成的是计算richtextbox中的所有字符并显示它们中的哪些是元音，它将不断更新并显示工具条中的字符/元音数量。 相当简单的代码，但在foreach循环和textchanged中似乎有一些错误。 会很感激一些反馈请:)

private void Form1_Load(object sender, EventArgs e)
{
    int vowels;
    int characters;
    foreach(int char in rtbDoc)
    {
        characters+=1;
    }
    if (rtbDoc.Text == "a".ToLower() || rtbDoc.Text == "e".ToLower() 
        || rtbDoc.Text == "i".ToLower() || rtbDoc.Text == "o".ToLower()
        || rtbDoc.Text == "u".ToLower())
    {
        vowels += 1;
    }

    toolStripStatusLabel1.TextChanged = characters + 
                      "Characters, of which " + vowels + " are vowels";
}

Answer 1

这是Linq方法

char[] Vowels = new char[] { 'a', 'e', 'i', 'o', 'u' };
int CharacterCount = rtbDoc.Text.Length;
int VowelCount = rtbDoc.Text.Count(x => Vowels.Any(y => char.ToLower(x) == y));

Answer 2

首先我建议提取一个方法 ：

private static bool IsVowel(Char value) {
  //TODO: is 'y' a vowel?
  return 
    value == 'a' || value == 'i' || value == 'e' || value == 'o' || value == 'u' ||
    value == 'A' || value == 'I' || value == 'E' || value == 'O' || value == 'U';
}

然后使用Linq ：

//TODO: do you really want to compute vowels count on Form Load? Not on rtbDoc.TextChanged?
private void Form1_Load(object sender, EventArgs e) {
  String text = rtbDoc.Text;

  // Finally, formatting which is more readable
  //DONE: you've probably want to assign to Text, not to TextChanged
  toolStripStatusLabel1.Text = 
    String.Format("{0} Characters, of which {1} are vowels.", 
                  text.Length,
                  text.Count(c => IsVowel(c)));
}

Answer 3

如果它是元音，你必须检查每个字符

private void Form1_Load(object sender, EventArgs e)
{
  char[] vowelSet = { 'a', 'e', 'i', 'o', 'u' };
  int vowels = 0;
  int characters = 0;
  foreach(char c in rtbDoc.Text.ToLower())
  {
    characters+=1;

    if (vowelSet.Contains(c))
    {
        vowels += 1;
    }
  }

  toolStripStatusLabel1.TextChanged = characters + 
                      "Characters, of which " + vowels + " are vowels";
}

要在更改后更新标签，您必须使用RichTextBox的TextChanged事件

Answer 4

如果您希望每次更改时都更新代码，那么您的代码应该是这样的

 // you code should be inside the TextChanged event for the richtextbox to get called everytime the text is modified
    private void rtbDoc_TextChanged(object sender, EventArgs e) {
        int vowels = 0; // you should initialize your variables
        int characters = 0;// you should initialize your variables
        foreach (char c in rtbDoc.Text) { // you can't name a variable " char ", and you should choose rtbDoc.Text
            characters += 1;
            if (c.ToString().ToLower() == "a" || c.ToString().ToLower() == "e" // ToLower() function should be on the input
                || c.ToString().ToLower() == "i" || c.ToString().ToLower() == "o" // you should check the character not the whole text
                || c.ToString().ToLower() == "u") {
                vowels += 1;
            }
        }// the if part should be inside the foreach loop to check every character 

        toolStripStatusLabel1.Text = characters +           // you should use toolStripStatusLabel1.Text 
                          "Characters, of which " + vowels + " are vowels";
    }

Answer 5

你快到了。

您的if语句表示如果框中的文本是“a”（或任何其他元音字符），请添加一个。 否则，你什么都不做。 例如，输入“aeiou”。 你的if语句不会添加一个元音，然后你订阅textchanged就完成了。 目前，您没有循环RichTextBox中的文本。 由fubo概述的Linq方法工作并且更加清洁，但是与你已经拥有的东西相比，你应该做的是：

var characters = rtbDoc.Text.Length;

foreach(var char in rtb.Text.ToLower())
    if(IsVowel(char)) 
         vowel+=1;