Question

如何计算VB.NET中字符串中特定字符的出现次数？
比如我有一个字符串：

123＃17453＃40110＃065

我想确定获取#符号计数的代码是什么这是3。

Answer 1

这是一个lambda表达式：

 Dim s As String = "123#17453#40110#065"
 Dim result = s.Where(Function(c) c = "#"c).Count

Answer 2

试试这个：

Dim count = "123.0#17453#40110#065".Count(Function(x) x = "#")

或通过放置在模块中的扩展方法：

<Extension> Public Function Occurs(target As String, character As Char) As Integer
    Return target.Count(Function(c) c = character)
End Function

Dim count = "123.0#17453#40110#065".Occurs("#"c)

Answer 3

详细的VB.NET示例：

Dim s As String = "123#17453#40110#065"
Dim count As Integer = 0
For Each c As Char In s
    If c = "#" Then count = count + 1
Next
Console.WriteLine("'#' appears {0} times.", count)

强制性简约C＃示例：

Int32 count = "123#17453#40110#065".Count( c => c == '#' );

获取字符串中的字符数

3 个答案: