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Best way to change dictionary key

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忘掉有多难
忘掉有多难 2020-12-03 10:02

I am wondering is there a better way to change a dictionary key, for example:

var dic = new Dictionary();
dic.Add(\"a\", 1);
4条回答
  • 囚心锁ツ
    囚心锁ツ (楼主)
    2020-12-03 10:34

    Do you like this simple code?

    var newDictionary= oldDictionary.ReplaceInKeys("_","-");



    
  
    It replace '_' with '-' in all keys
    

    


    


    If 
    


      

    • type of your key is string 
      • 

    


    and 
    


      

    • you want replace a string with other string in all keys of the dictionary 
      • 

    


    then use my way
    


    


    You just need to add the following class to your app:
    


    public static class DicExtensions{

    public static void ReplaceInKeys(this IDictionary oldDictionary, string replaceIt, string withIt)
    {
          // Do all the works with just one line of code:
          return oldDictionary
                 .Select(x=> new KeyValuePair(x.Key.Replace(replaceIt, withIt), x.Value))
                 .ToDictionary(x=> x.Key,x=> x.Value);
    }
}

    


    
  
    I use Linq to change my dictionary keys (regenerate a dictionary by linq) 
    
  
  
    The magic step is ToDictionary() method.
    

    


    


    
  
    Note: We can make an advanced Select include a block of codes for complicated cases instead of a simple lambda. 
    

    


    Select(item =>{
            .....Write your Logic Codes Here....

            return resultKeyValuePair;
       })

    
    
    
             
    
                                                        
    
            
            
    
              
                
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