blocks|key|1225778|text|using+(StringReader+sr+=+new+StringReader(text))+{
++++string+line;
++++while+((line+=+sr.ReadLine())+!=+null)+{
++++++++//+do+something
++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1225779|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>using (StringReader sr = new StringReader(text)) {
 string line;
 while ((line = sr.ReadLine()) != null) {
 // do something
 }
}
</code></pre>

blocks|key|1225721|text|您可以使用Regex.Split：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1225722|string[]+tokens+=+Regex.Split(input,+@"\r?\n%7C\r");|code-block|syntax|javascript|1225723|编辑:添加了%7C\r来解释(旧的)+Mac线路终结器。|offset|length|style|CODE|1225724|entityMap^0|0|0|6|3|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

You could use Regex.Split:

<pre><code>string[] tokens = Regex.Split(input, @"\r?\n|\r");
</code></pre>

Edit: added <code>|\r</code> to account for (older) Mac line terminators.

blocks|key|1225750|text|如果您想保留空行，只需删除StringSplitOptions即可。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1225751|var+result+=+input.Split(System.Environment.NewLine.ToCharArray());|code-block|syntax|javascript|1225752|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|$]]

If you want to keep empty lines just remove the StringSplitOptions.

<pre><code>var result = input.Split(System.Environment.NewLine.ToCharArray());
</code></pre>

blocks|key|1440589|text|string[]+lines+=+input.Split(new[]+{+'\r',+'\n'+},+StringSplitOptions.RemoveEmptyEntries);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1440590|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre class="lang-cs prettyprint-override"><code>string[] lines = input.Split(new[] { '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries);
</code></pre>

blocks|key|1225770|text|稍微有点扭曲，但需要一个迭代器代码块来完成：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1225771|public+static+IEnumerable<string>+Lines(this+string+Text)
{
++++int+cIndex+=+0;
++++int+nIndex;
++++while+((nIndex+=+Text.IndexOf(Environment.NewLine,+cIndex+%2B+1))+!=+-1)
++++{
++++++++int+sIndex+=+(cIndex+==+0+?+0+:+cIndex+%2B+1);
++++++++yield+return+Text.Substring(sIndex,+nIndex+-+sIndex);
++++++++cIndex+=+nIndex;
++++}
++++yield+return+Text.Substring(cIndex+%2B+1);
}|code-block|syntax|javascript|1225772|然后，您可以调用：|1225773|var+result+=+input.Lines().ToArray();|1225774|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Slightly twisted, but an iterator block to do it:

<pre><code>public static IEnumerable&lt;string&gt; Lines(this string Text)
{
 int cIndex = 0;
 int nIndex;
 while ((nIndex = Text.IndexOf(Environment.NewLine, cIndex + 1)) != -1)
 {
 int sIndex = (cIndex == 0 ? 0 : cIndex + 1);
 yield return Text.Substring(sIndex, nIndex - sIndex);
 cIndex = nIndex;
 }
 yield return Text.Substring(cIndex + 1);
}
</code></pre>

You can then call:

<pre><code>var result = input.Lines().ToArray();
</code></pre>

blocks|key|1440599|text|++++private+string[]+GetLines(string+text)
++++{

++++++++List<string>+lines+=+new+List<string>();
++++++++using+(MemoryStream+ms+=+new+MemoryStream())
++++++++{
++++++++++++StreamWriter+sw+=+new+StreamWriter(ms);
++++++++++++sw.Write(text);
++++++++++++sw.Flush();

++++++++++++ms.Position+=+0;

++++++++++++string+line;

++++++++++++using+(StreamReader+sr+=+new+StreamReader(ms))
++++++++++++{
++++++++++++++++while+((line+=+sr.ReadLine())+!=+null)
++++++++++++++++{
++++++++++++++++++++lines.Add(line);
++++++++++++++++}
++++++++++++}
++++++++++++sw.Close();
++++++++}



++++++++return+lines.ToArray();
++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1440600|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> private string[] GetLines(string text)
 {

 List&lt;string&gt; lines = new List&lt;string&gt;();
 using (MemoryStream ms = new MemoryStream())
 {
 StreamWriter sw = new StreamWriter(ms);
 sw.Write(text);
 sw.Flush();

 ms.Position = 0;

 string line;

 using (StreamReader sr = new StreamReader(ms))
 {
 while ((line = sr.ReadLine()) != null)
 {
 lines.Add(line);
 }
 }
 sw.Close();
 }



 return lines.ToArray();
 }
</code></pre>

blocks|key|1225818|text|在没有任何分配的情况下将字符串拆分成行。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1225819|public+static+LineEnumerator+GetLines(this+string+text)+{
++++return+new+LineEnumerator(+text.AsSpan()+);
}

internal+ref+struct+LineEnumerator+{

++++private+ReadOnlySpan<char>+Text+{+get;+set;+}
++++public+ReadOnlySpan<char>+Current+{+get;+private+set;+}

++++public+LineEnumerator(ReadOnlySpan<char>+text)+{
++++++++Text+=+text;
++++++++Current+=+default;
++++}

++++public+LineEnumerator+GetEnumerator()+{
++++++++return+this;
++++}

++++public+bool+MoveNext()+{
++++++++if+(Text.IsEmpty)+return+false;

++++++++var+index+=+Text.IndexOf(+'\n'+);+//+\r\n+or+\n
++++++++if+(index+!=+-1)+{
++++++++++++Current+=+Text.Slice(+0,+index+%2B+1+);
++++++++++++Text+=+Text.Slice(+index+%2B+1+);
++++++++++++return+true;
++++++++}+else+{
++++++++++++Current+=+Text;
++++++++++++Text+=+ReadOnlySpan<char>.Empty;
++++++++++++return+true;
++++++++}
++++}


}|code-block|syntax|javascript|1225820|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|$]]

Split a string into lines without any allocation.
<pre><code>public static LineEnumerator GetLines(this string text) {
 return new LineEnumerator( text.AsSpan() );
}

internal ref struct LineEnumerator {

 private ReadOnlySpan&lt;char&gt; Text { get; set; }
 public ReadOnlySpan&lt;char&gt; Current { get; private set; }

 public LineEnumerator(ReadOnlySpan&lt;char&gt; text) {
 Text = text;
 Current = default;
 }

 public LineEnumerator GetEnumerator() {
 return this;
 }

 public bool MoveNext() {
 if (Text.IsEmpty) return false;

 var index = Text.IndexOf( '\n' ); // \r\n or \n
 if (index != -1) {
 Current = Text.Slice( 0, index + 1 );
 Text = Text.Slice( index + 1 );
 return true;
 } else {
 Current = Text;
 Text = ReadOnlySpan&lt;char&gt;.Empty;
 return true;
 }
 }


}
</code></pre>

How do you split multi-line string into lines?

I know this way

<pre><code>var result = input.Split("\n\r".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
</code></pre>

looks a bit ugly and loses empty lines. Is there a better solution?

Best way to split string into lines

如何将多行字符串拆分成行？我知道这条路var result = input.Split("\n\r".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);看起来有点丑陋，并且丢失了空行。有没有更好的解决方案？

问将字符串拆分成行的最佳方法
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回答 7

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