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  • c# dictionnary根据value查找对应的key

    属性方法中并没有包含此功能,因此需要自己自定义一个方法:

    string regionName = "";
                if (ControlForm.swichLanguage.Contains("EN"))
                {
                    var regionName1 = en_Resx.Where(q => q.Value == ((Button)sender).Text).Select(q => q.Key);
                    IEnumerator enumerator = regionName1.GetEnumerator();
                    while (enumerator.MoveNext())
                    {
                        regionName = (string)enumerator.Current;
                    }
                }
                else
                {
                    regionName = ((Button)sender).Text;
                }

    其它方法查看(如下):

     private void GetDicKeyByValue()
            {
                Dictionary<string, string> dic = new Dictionary<string, string>();
                dic.Add("1", "1");
                dic.Add("2", "2");
                dic.Add("3", "2");
                //foreach KeyValuePair traversing
                foreach (KeyValuePair<string, string> kvp in dic)
                {
                    if (kvp.Value.Equals("2"))
                    { 
                        //...... kvp.Key;
                    }
                }
    
                //foreach dic.Keys
                foreach (string key in dic.Keys)
                {
                    if (dic[key].Equals("2"))
                    { 
                        //...... key
                    }
                }
    
                //Linq
                var keys = dic.Where(q => q.Value == "2").Select(q => q.Key);  //get all keys
    
                List<string> keyList = (from q in dic
                                        where q.Value == "2"
                                        select q.Key).ToList<string>(); //get all keys
    
                var firstKey = dic.FirstOrDefault(q => q.Value == "2").Key;  //get first key
            }
    
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  • 原文地址:https://www.cnblogs.com/gaara-zhang/p/9766619.html
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