Question

我的程序有

FlatTextBox1
  FlatButton1
  FlatAlertBox1

所以，我已经做到了，当您在文本框中键入内容并单击按钮时，它会从网址请求并将结果返回到警告框。我的问题是，我如何制作它只返回第一个数字和点？例如，如果它返回：

Success: 255.255.255.255 <br><br><br> Old Success: 127.0.0.1

我希望它只显示

255.255.255.255

Answer 1

最简单的方法是通过substring：

进行字符串操作

    Dim sResult As String = "Success: 255.255.255.255 <br><br><br> Old Success: 127.0.0.1"  ' This is hardcoded for the example
    Dim nIndex1 As Int32 = sResult.IndexOf(" ") ' Find the first blank space character (after Success:)
    Dim nIndex2 As Int32 = sResult.IndexOf("<br>")  ' Find the first br tag (after the space which is after the ip address we want to capture)

    sResult = sResult.Substring(nIndex1, nIndex2 - nIndex1).Trim    ' Use substring to get the ip address and trim off the excess spaces

Answer 2

您可以使用string.remove

更改字符串

Dim sResult As String = "Success: 255.255.255.255 <br><br><br> Old Success: 127.0.0.1"  
Dim break = sResult.IndexOf("<br>") 'find the first time it says "<br>"
Dim sresult = sResult.Remove(break) 'remove from the string

仅显示数字和点

2 个答案: