/// 
        /// 除去数组中的空值和签名参数并以字母a到z的顺序排序        /// 
        /// 过滤前的参数组        /// 
     
      过滤后的参数组
             public static Dictionary
     
       FilterPara(SortedDictionary
      
        dicArrayPre)        {            Dictionary
       
         dicArray = new Dictionary
        
         ();            foreach (KeyValuePair
         
           temp in dicArrayPre)            {                if (temp.Key.ToLower() != "sign" && temp.Key.ToLower() != "sign_type" && temp.Value != "" && temp.Value != null)                {                    dicArray.Add(temp.Key, temp.Value);                }            }            return dicArray;        }
         
        
       
      
     

/// 
        /// 把数组所有元素，按照“参数=参数值”的模式用“&”字符拼接成字符串        /// 
        /// 需要拼接的数组        /// 
     
      拼接完成以后的字符串
             public static string CreateLinkString(Dictionary
     
       dicArray)        {            StringBuilder prestr = new StringBuilder();            foreach (KeyValuePair
      
        temp in dicArray)            {                prestr.Append(temp.Key + "=" + temp.Value + "&");            }            //去掉最後一個&字符            int nLen = prestr.Length;            prestr.Remove(nLen - 1, 1);            return prestr.ToString();        }
      
     

/// 
        /// 把数组所有元素，按照“参数=参数值”的模式用“&”字符拼接成字符串，并对参数值做urlencode        /// 
        /// 需要拼接的数组        /// 字符编码        /// 
     
      拼接完成以后的字符串
             public static string CreateLinkStringUrlencode(Dictionary
     
       dicArray, Encoding code)        {            StringBuilder prestr = new StringBuilder();            foreach (KeyValuePair
      
        temp in dicArray)            {                prestr.Append(temp.Key + "=" + HttpUtility.UrlEncode(temp.Value, code) + "&");            }            //去掉最後一個&字符            int nLen = prestr.Length;            prestr.Remove(nLen - 1, 1);            return prestr.ToString();        }
      
     

 

C# get keys and values from List<KeyValuePair<string, string>

private List
     
      
       > KV_List = new List
       
        
         >();    void initList()    {        KV_List.Add(new KeyValuePair
         
          ("qwer", "asdf"));        KV_List.Add(new KeyValuePair
          
           ("qwer", "ghjk")); KV_List.Add(new KeyValuePair
           
            ("zxcv", "asdf")); KV_List.Add(new KeyValuePair
            
             ("hjkl", "uiop")); }
            
           
          
         
        
       
      
     

// #1: get all keys (remove Distinct() if you don't want it)List
     
       allKeys = (from kvp in KV_List select kvp.Key).Distinct().ToList();// allKeys = { "qwer", "zxcv", "hjkl" }// #2: get values for a keystring key = "qwer";List
      
        values = (from kvp in KV_List where kvp.Key == key select kvp.Value).ToList();// values = { "asdf", "ghjk" }// #3: get keys for a valuestring value = "asdf";List
       
         keys = (from kvp in KV_List where kvp.Value == value select kvp.Key).ToList();// keys = { "qwer", "zxcv" }
       
      
     

https://stackoverflow.com/questions/31414429/c-sharp-get-keys-and-values-from-listkeyvaluepairstring-string

 

How to insert an item into a key/value pair object?

List
     
      
       > kvpList = new List
       
        
         >(){    new KeyValuePair
         
          ("Key1", "Value1"),    new KeyValuePair
          
           ("Key2", "Value2"), new KeyValuePair
           
            ("Key3", "Value3"),};kvpList.Insert(0, new KeyValuePair
            
             ("New Key 1", "New Value 1"));
            
           
          
         
        
       
      
     

foreach (KeyValuePair
     
       kvp in kvpList){    Console.WriteLine(string.Format("Key: {0} Value: {1}", kvp.Key, kvp.Value);}