blocks|key|1001277|text|string[]+theSplit+=+inputString.Split('_');+//+split+at+underscore
string+firstPart+=+theSplit[0];+//+get+the+first+part
string+secondPart+=+"_"+%2B+theSplit[1];+//+get+the+second+part+and+concatenate+the+underscore+to+at+the+front|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1001278|编辑:以下是注释；只有在输入字符串中有一个下划线字符的实例时，才能这样做。|unstyled|1001279|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>string[] theSplit = inputString.Split('_'); // split at underscore
string firstPart = theSplit[0]; // get the first part
string secondPart = "_" + theSplit[1]; // get the second part and concatenate the underscore to at the front
</code></pre>

<p>EDIT: Following from the comments; this only works if you have one instance of the underscore character in your input string.</p>


blocks|key|1001294|text|更新的答案(适用于C#+8及以上)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1001295|C#+8引入了一个名为范围和指数的新特性，它为处理字符串提供了更简洁的语法。|offset|length|1001296|string+s+=+"My.+name.+is+Bond._James+Bond!";
int+idx+=+s.LastIndexOf('.');

if+(idx+!=+-1)
{
++++Console.WriteLine(s[..idx]);+//+"My.+name.+is+Bond"
++++Console.WriteLine(s[(idx+%2B+1)..]);+//+"_James+Bond!"
}|code-block|syntax|javascript|1001297|原始答案(+C#+7及以下)|1001298|这是使用string.Substring(int,+int)方法的原始答案。如果你愿意的话，使用这种方法还是可以的。|style|CODE|1001299|string+s+=+"My.+name.+is+Bond._James+Bond!";
int+idx+=+s.LastIndexOf('.');

if+(idx+!=+-1)
{
++++Console.WriteLine(s.Substring(0,+idx));+//+"My.+name.+is+Bond"
++++Console.WriteLine(s.Substring(idx+%2B+1));+//+"_James+Bond!"
}|1001300|entityMap|0|LINK|mutability|MUTABLE|url|https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/tutorials/ranges-indexes^0|0|B|5|0|0|0|0|4|Q|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@$D|12|E|13|1|14]]|A|$]]|$1|F|3|G|5|H|7|15|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|16|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|17|8|@$D|18|E|19|O|P]]|9|@]|A|$]]|$1|Q|3|R|5|H|7|1A|8|@]|9|@]|A|$I|J]]|$1|S|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]]]

<h1>Updated Answer (for C# 8 and above)</h1>
<p>C# 8 introduced a new feature called <a href="https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/tutorials/ranges-indexes" rel="noreferrer">ranges and indices</a>, which offer a more concise syntax for working with strings.</p>
<pre class="lang-cs prettyprint-override"><code>string s = &quot;My. name. is Bond._James Bond!&quot;;
int idx = s.LastIndexOf('.');

if (idx != -1)
{
    Console.WriteLine(s[..idx]); // &quot;My. name. is Bond&quot;
    Console.WriteLine(s[(idx + 1)..]); // &quot;_James Bond!&quot;
}
</code></pre>
<h1>Original Answer (for C# 7 and below)</h1>
<p>This is the original answer that uses the <code>string.Substring(int, int)</code> method. It's still OK to use this method if you prefer.</p>
<pre class="lang-cs prettyprint-override"><code>string s = &quot;My. name. is Bond._James Bond!&quot;;
int idx = s.LastIndexOf('.');

if (idx != -1)
{
    Console.WriteLine(s.Substring(0, idx)); // &quot;My. name. is Bond&quot;
    Console.WriteLine(s.Substring(idx + 1)); // &quot;_James Bond!&quot;
}
</code></pre>


blocks|key|1279788|text|您也可以使用一点LINQ。第一部分有点冗长，但最后一部分相当简洁：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1279789|string+input+=+"My.+name.+is+Bond._James+Bond!";

string[]+split+=+input.Split('.');
string+firstPart+=+string.Join(".",+split.Take(split.Length+-+1));+//My.+name.+is+Bond
string+lastPart+=+split.Last();+//_James+Bond!|code-block|syntax|javascript|1279790|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>You can also use a little bit of LINQ. The first part is a little verbose, but the last part is pretty concise :</p>

<pre><code>string input = "My. name. is Bond._James Bond!";

string[] split = input.Split('.');
string firstPart = string.Join(".", split.Take(split.Length - 1)); //My. name. is Bond
string lastPart = split.Last(); //_James Bond!
</code></pre>


blocks|key|278604|text|假设您只希望拆分字符出现在第二个和更大的拆分字符串上.|type|ordered-list-item|depth|inlineStyleRanges|entityRanges|data|278605|假设你想忽略重复的分裂字符..。|278606|更多的花括号..。检查一下..。|278607|更优雅..。也许..。|278608|更有趣..。太棒了！
var+s=+"My.+name.is+Bond._James+Bond!"；var+firstSplit+=+true；var+splitChar+=+'_'；var+splitStrings+=+s.Split(new[]+{+splitChar+}，StringSplitOptions.RemoveEmptyEntries)+.Select(x+=>+{+if+(!+firstSplit+)+{Bond%2B+x；}firstSplit=+false；返回x；})；|278609|unstyled|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|P|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|Q|8|@]|9|@]|A|$]]|$1|J|3|-4|5|K|7|R|8|@]|9|@]|A|$]]]|L|$]]

<ol>
<li>Assuming you only want the split character to appear on the second and greater split strings...</li>
<li>Assuming you want to ignore duplicate split characters...</li>
<li>More curly braces... check...</li>
<li>More elegant...  maybe...</li>
<li><p>More fun... Heck yeah!!</p>

<pre><code>var s = "My. name. is Bond._James Bond!";
var firstSplit = true;
var splitChar = '_';
var splitStrings = s.Split(new[] { splitChar }, StringSplitOptions.RemoveEmptyEntries)
    .Select(x =&gt;
    {
        if (!firstSplit)
        {
            return splitChar + x;
        }
        firstSplit = false;
        return x;
    });
</code></pre></li>
</ol>


<p>Let's say I need to split string like this:</p>

<p>Input string: "My. name. is Bond._James Bond!"
Output 2 strings:</p>

<ol>
<li>"My. name. is Bond"</li>
<li>"_James Bond!"</li>
</ol>

<p>I tried this:</p>

<pre><code>int lastDotIndex = inputString.LastIndexOf(".", System.StringComparison.Ordinal);
string firstPart = inputString.Remove(lastDotIndex);
string secondPart= inputString.Substring(lastDotIndex + 1, inputString.Length - firstPart.Length - 1);
</code></pre>

<p>Can someone propose more elegant way?</p>


Best way to split string by last occurrence of character?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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假设我需要像这样分割字符串：输入字符串：“我的.名称.是Bond._James键！”输出2个字符串：“我的名字是邦德”"_James邦德！“我试过这个：int lastDotIndex = inputString.LastIndexOf(".", System.StringComparison.Ordinal);str...

问用上次出现的字符来分割字符串的最佳方法？
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问用上次出现的字符来分割字符串的最佳方法？EN