在VB.NET中替换/删除字符串中的字符 [英] Replace/Remove a Character in a String in VB.NET

问题描述

嗨！请帮我解决一下这个。我想在字符串中做两件事。

首先，例如，字符串的值是file.name.txt，我想将其更改为file.name_txt 。如果有多个。，我想改变最后一个。到_并保留前面的。。

其次，如果我有一个字符串值file.name_txt.enc，我想将最后一个_替换为。并删除从最后一个。开始的字符。

我熟悉字符串的替换和删除方法，但是当重复特定字符时我不知道怎么做我想要替换或删除。

解决方案

使用string.LastIndexOf来识别最后的'dot'，然后使用string.Substring来更改它：

  Dim  filename 作为 字符串 =   file.name.txt 
  Dim  lastDot 作为 整数 = filename.LastIndexOf（ 。 C）
 filename = filename.Substring（ 0 ，lastDot）&   _& filename.Substring（lastDot +  1 ）

您可以使用类似的代码执行第二项任务。

Hi! Please help me with this. I want to do two things in a string.
First, for example, the value of the string is "file.name.txt", I'd like to change it to "file.name_txt". If ever there are multiple ".", I'd like to change the last "." to "_" and retain the preceding ".".
Secondly, If I have a string value "file.name_txt.enc", I like to replace the last "_" to "." and remove the characters starting from the last "."
I'm familiar with the replace and remove methods of string but i don't know how to do it when there are repetition of the specific character that I want to replace or remove.

解决方案

Use string.LastIndexOf to ID the final 'dot' and then string.Substring to change it:

Dim filename As String = "file.name.txt"
Dim lastDot As Integer = filename.LastIndexOf("."C)
filename = filename.Substring(0, lastDot) & "_" & filename.Substring(lastDot + 1)

You can use similar code to do the second task.

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