％^& *（）_ + - ）在文本框中。我想计算文本框中只出现特殊字符和输出。



样本输出：

## 242 >
@的数量：212

。

。

.etc



我尝试过：



protected void OFD_Click（object sender，RoutedEventArgs e）

{

OpenFileDialog openFile = new OpenFileDialog（）;



if（openFile.ShowDialog（）== true）

{

string filepath = openFile.FileName;

textbox.Text = File.ReadAllText（filepath）;





}}

%^&*()_+-) in textbox. I want to count the occurrence of only special characters and output in textbox.

sample output:
Number of #: 242
Number of @ : 212
.
.
.etc

What I have tried:

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

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


}}

见这里：计算字符串中的行 [ ^ ] - 它与行有关，但它们只是一个特殊分隔符（即'\ n'）你可以用一系列可搜索的字符替换它们。

它提供了多种方法，并告诉你每种方法的可能性能成本。

See here: Counting Lines in a String[^] - it's to do with lines, but they are just a "special delimiter" (i.e. '\n') which you could replace with an array of "searchable characters".
It presents a variety of ways to do it, and tells you the probable performance cost of each.

所以为了做到这一点，我建议你读一读在正则表达式，但这是一个例子



正则表达式类（System.Text.RegularExpressions） [ ^ ]



正则表达式语言 - 快速参考| Microsoft Docs [ ^ ]



C＃正则表达式 [ ^ ]



[ ^ ]

So in order to do this I suggest you read up on regexes but here is an example

Regex Class (System.Text.RegularExpressions)[^]

Regular Expression Language - Quick Reference | Microsoft Docs[^]

C# Regular Expressions[^]

[^]

// Define special characters in regex string
var regexString = @"[(~!@#