％^& *（）_ + - ）在文本框中。

我写的是将文件的所有内容写入文本框。

我想计算文本框中每个字符和输出的出现次数。



样本输出：

%^&*()_+-) in textbox.
what i wrote is write all content of file to textbox.
I want to count occurrence of each character and output in textbox.

Sample output:

<pre><pre>Number of 'a':10

Number of 'b':20

Number of '@':5

。

。

.
.

Number of 'z':15

我尝试了什么：

What I have tried:

protected void Button_Click(object sender, RoutedEventArgs e)
{
    OpenFileDialog openFile = new OpenFileDialog();

    if (openFile.ShowDialog()==true)
    {
        string filepath = openFile.FileName;
        textbox.Text = File.ReadAllText(filepath);


        readbar.Value = 100;

    }

}

你可以使用字典< char，int> 计算每个字符的出现次数。

You could use a Dictionary<char, int> to count each character's occurrences.

Dictionary<char, int> occurrences = new Dictionary<char, int>();
string text = File.ReadAllText(filepath);
foreach (char c in text) {
   if (!occurrences.ContainsKey(c)) {
      occurrences.Add(c, 1);
   }
   else {
      occurrences[c]++;
   }
}

您将以字符串中每个字符的出现次数结束。但是如果您的输入文本文件包含无法用简单的 char 值表示的unicode字符，则可能会变得更加困难。

You will end with the number of occurrences of each character in the string. But it may get a little more difficult if your input text file contains unicode characters which cannot be represented by a simple char value.

试试这个：

Try this:

string content = "ABCDEFFGGGHHHHIIIII";
var differentChars = content.GroupBy(g => g).Select (g => new {c = (char) g.Key, count = g.Count()});

然后你可以使用 foreach

You can then use foreach

foreach (var pair in differentChars)
    {
    Console.WriteLine("{0}:{1}", pair.c, pair.count);
    }