下面代码的输出是什么？ [英] What would be the output of the folowwing code

问题描述

 使用 System.Text.RegularExpressions; 
 
  string  str =   <多边形> 
< Vertex x =  9352 。 7606  < span class =code-string>  y =  8250 。 6001    z =  505 。 3871    /> 
< Vertex x =  9352 。 7573    y =  8250 。 6001    z =  505 。 3844    /> 
< / Polygon>; 
 
 
  var  result = Regex.Split（str，   \ r \ n | \ r | \ n）; 
 
列表< string> lineString =  new 列表< string>（）; 
 
  for （ int  count =  0 ; count< result.Length; count ++）
 {
 lineString.Add（result [count]）; 
} 
 
 MatchCollection matches = Regex.Matches（lineString， @   \d +（\.\d +）？）; 
列表< double> numbers = 新列表< double>（）; 
  foreach （匹配m   matches）
 {
 numbers.Add（ Double  .Parse（m.Value， new  System.Globalization.NumberFormatInfo（）{NumberDecimalSeparator =  。}））; 
} 
 
 StringBuilder sb =  new  StringBuilder（）; 
 
  foreach （ double  newNumbers  in  numbers）
 {
 sb.Append（numbers [newNumbers] .ToString（）+   \t）; 
 
} 
 
  string  finalResult = sb.ToString（）; 
 
 Console.WriteLine（finalResult）; 

解决方案

编译错误：很多。

您的字符串str 行将无法编译...

尝试：

  string  str =  @ < Polygon> 
< Vertex x =9352.7606y =8250.6001z =505.3871/> 
< Vertex x =9352.7573y =8250.6001 z =505.3844/> 
< /多边形>; 

然后，你将进入下一个编译器错误：

 MatchCollection matches = Regex.Matches（lineString， @  \d +（\.\d +）？）; 

由于 lineString 是一个字符串列表，并没有Regex.Matches方法列出...



加油！这并不复杂：我昨天给你了90％如何仅从字符串中提取数字 [ ^ ] - 你要做的就是思考一下，并在它周围添加一些代码......

using System.Text.RegularExpressions;
 
string str = "<Polygon>
          <Vertex x="9352.7606" y="8250.6001" z="505.3871" />
          <Vertex x="9352.7573" y="8250.6001" z="505.3844" />
          </Polygon>";
 

var result = Regex.Split(str, "\r\n|\r|\n");
 
List<string> lineString=new List<string>();
 
for(int count=0;count<result.Length;count++)
{
   lineString.Add(result[count]);
}
 
MatchCollection matches = Regex.Matches(lineString, @"\d+(\.\d+)?");
List<double> numbers = new List<double>();
foreach (Match m in matches)
{
    numbers.Add(Double.Parse(m.Value, new System.Globalization.NumberFormatInfo() { NumberDecimalSeparator = "." }));
}
 
StringBuilder sb=new StringBuilder();
 
foreach(double newNumbers in numbers)
{
sb.Append(numbers[newNumbers].ToString()+"\t");
 
}
 
string finalResult=sb.ToString();
 
Console.WriteLine(finalResult);

解决方案

Compiler error: lots of.
Your string str line will not compile...
Try:

string str = @"<Polygon>
               <Vertex x=""9352.7606"" y=""8250.6001"" z=""505.3871"" />
               <Vertex x=""9352.7573"" y=""8250.6001"" z=""505.3844"" />
               </Polygon>";

And then, you will get to the next compiler error:

MatchCollection matches = Regex.Matches(lineString, @"\d+(\.\d+)?");

Since lineString is a List of strings, and there is no Regex.Matches method that takes a list...

Come on! This isn't complicated: I gave you 90% of this yesterday How to extract only numbers from a string[^] - all you have to do is think a little, and add a bit of code around it...

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