.net 如何将 stringbuilder 与字符串进行比较 [英] .net how to compare a stringbuilder to a string

问题描述

在 vb.net(或 C#)中，我不知道如何将 stringbuilder 与字符串进行比较.我已经搜索了很多，但找不到答案.我必须编写自己的例程.没有更好的方法吗?

In vb.net (or C#) I can't figure out how to compare a stringbuilder to a string. I have searched quite a bit and can't find the answer. I had to write my own routine. Isn't there a better way?

这不起作用:

Dim s As String = "abc"
Dim sb As New StringBuilder("abc")
If sb.Equals(s) Then
  Console.WriteLine(sb.ToString() + " DOES equal " + s)
Else
  Console.WriteLine(sb.ToString() + " does NOT equal " + s)
End If

该代码的结果是:abc 不等于 abc

Results of that code is: abc does NOT equal abc

是否有某种方法可以在不编写自己的例程的情况下将 stringbuilder 与 string 进行比较?很明显我遗漏了一些东西，因为我在任何地方都找不到这个问题.

Isn't there some way of comparing a stringbuilder to a string without writing my own routine? It's probably something obvious that I'm missing since I can't find this question anywhere.

推荐答案

最简单的方法是将 StringBuilder 的内容作为字符串获取:

The simplest way is to get the content of the StringBuilder as a string:

If sb.ToString() = s Then ...

如果您想避免创建该字符串(可能是出于内存使用问题)，恐怕您必须编写自己的例程来比较它们.基本上是这样的:

If you want to avoid creating that string (perhaps for memory usage concerns), I am afraid that you have to write your own routine to compare them. Basically something like:

Public Shared Function SbEquals(sb As StringBuilder, s As String) As Boolean
  If sb.Length <> s.Length Then Return False
  For i As Integer = 0 to s.Length - 1
    If sb(i) <> s(i) Return False
  Next
  Return True
End Function

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