如何在任何操作员签名之前解析字符串？ [英] How Can I Parse A String Before Any Operator Sign ?

问题描述

假设我有这样的字符串



EndMarket = 100



我想只获得EndMarket该字符串中的部分。



有时它可以是EndMarket< = 100或BeginMarket> = 50或BeginMarket< 20等



每次如果他找到任何类似<，=，>的运算符然后我得到操作员之前的部分。



对于我们的例子，我想使用C＃代码获得EndMarket或BeginMarket部分。



任何人都可以提供此问题的代码吗？

解决方案

参见 http://msdn.microsoft.com/en-us/library/b873y76a（v = vs.110）的.aspx [< a href =http://msdn.microsoft.com/en-us/library/b873y76a(v=vs.110).aspx\"target =_ blanktitle =New Window> ^ ]。

您可以使用 String.Split 方法或正则表达式。



如果您打算使用拆分这样的事情可能适合您;

< pre lang =cs> 使用系统;
使用 System.Linq;
使用 System.Collections.Generic;

命名空间示例{

// < span class =code-comment>注意，没有考虑错误处理！
public static class MyExtensions {
private static readonly IEnumerable< string>分隔符= new [] { > =， < =， ！=， >， <， =};

public static string GetVariable（ this string expression）{
if （Delimiters.Any（expression.Contains））{
var delimiter = Delimiters.Where（expression.Contains）.First（ ）;
return expression.Split（ new [] {delimiter}，StringSplitOptions.RemoveEmptyEntries）。 （）;
}
返回 null ;
}
}

class 计划{
静态 void Main（ string [] args）{
var input = new []
{
EndMarket = 100，
EndMarket< 200，
EndMarket> 300，
EndMarket！= 300
};

foreach （ var s in input）{
Console.WriteLine（ {0}：{1}，s，s.GetVariable（））;
}
}
}
}

希望这会有所帮助，

Fredrik

让我们认为你有3个运算符<，>和=（可根据需要增加）

  string  textValue = EndMarket< =  100 ; 
  string  [] splitted_string = textValue.Split（ new  Char [] { <'，' >'，'  ='}）; 
  foreach （ string  sp  in  splitted_string）{
 
  if （sp.Trim（）！=  ）
 {
  //  用sp做一些事情（返回你的第一部分，即EndMarket或你在textValue中使用的任何东西 
} 
} 

Suppose I have string like that

EndMarket=100

I want to get only EndMarket portion from this string.

Sometimes it can be EndMarket<=100 or BeginMarket>=50 or BeginMarket<20 etc.

For every time if he found any operator like <,=, > etc. then i get the portion before the operator.

For our example i want to get EndMarket or BeginMarket portion using C# code.

Can anyone provide a code for this problem?

解决方案

See http://msdn.microsoft.com/en-us/library/b873y76a(v=vs.110).aspx[^].

You could use the String.Split method or a regular expression.

If you were to go for using Split something like this might do the trick for you;

using System;
using System.Linq;
using System.Collections.Generic;

namespace Sample {
    
   // Beware, no error handling have been considered!
   public static class MyExtensions {
        private static readonly IEnumerable<string> Delimiters = new[] { ">=", "<=", "!=", ">", "<", "=" };

        public static string GetVariable(this string expression) {
            if (Delimiters.Any(expression.Contains)) {
                var delimiter = Delimiters.Where(expression.Contains).First();
                return expression.Split(new[] { delimiter }, StringSplitOptions.RemoveEmptyEntries).First();
            }
            return null;
        }
    }

    class Program {
        static void Main(string[] args) {
            var input = new[]
                {
                    "EndMarket=100",
                    "EndMarket<200",
                    "EndMarket>300",
                    "EndMarket!=300"
                };

            foreach (var s in input) {
                Console.WriteLine("{0}: {1}", s, s.GetVariable());
            }
        }
    }
}

Hope this helps,
Fredrik

Lets think you have 3 operators <,> and = (can increase as you need)

string textValue = EndMarket<=100;
string [] splitted_string = textValue.Split(new Char [] {'<', '>', '='});
foreach (string sp in splitted_string) {

       if (sp.Trim() != "")
         {
         //do something with sp (which returns you the first part i.e EndMarket or whatever you use in the textValue 
         }            
 }

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