How can i extract certain values from a dictionary ?

Question

User1253338400 posted

Hi 

I have a dictionary with the following values:

Dictionary<string, string> myDict = new Dictionary<string, string>();
myDict.Add("FirstName", "Name");
myDict.Add("LasatName", "Name");
myDict.Add("MiddleName", "Name");
myDict.Add("Street", "Address");
myDict.Add("Suburb", "Address");
myDict.Add("City", "Address");

How can i extract only the value of the Key such that the value is Name.

So for example I want to extract FirstName, LastName , MiddleName so that I have something like 

string.format ( FIRST = "FirstName", MIDDLE="MiddleName",LAST="LastName", ??????)

How can i get those values , firstname, lastname and  middle name via a linq expression 

thanks

Answer 1

User-1038772411 posted

Hello, robby32

yes you can. please follow below link for your answer.

https://stackoverflow.com/questions/7306767/linq-to-convert-a-string-to-a-dictionarystring-string

addons link :

https://stackoverflow.com/questions/4886530/get-value-from-key-using-linq

https://stackoverflow.com/questions/43806926/get-single-value-from-dictionary-by-key

Thanks.

Answer 2

User303363814 posted

The value of the FirstName element is

myDict["FirstName"]

If you are trying to produce a string with three parts of the name then it would be something like

var fullName = string.Format("{0} {1} {2}", myDict["FirstName"], myDict["MiddleName"], myDict["LasatName"]);

Since all three values are the same it is a little difficult to work out exactly what you are trying to achieve.  If you could specify different values for each of the entries and then show us the result you are trying to achieve it will help.  Showing 'code' that does not make any sense doesn't help to specify the result required.

Answer 3

User665608656 posted

Hi robby,

If you want to get the key in the dictionary, I suggest you should get the key based on the value.

Here is the code:

            Dictionary<string, string> myDict = new Dictionary<string, string>();
            myDict.Add("FirstName", "Name");
            myDict.Add("LasatName", "Name");
            myDict.Add("MiddleName", "Name");
            myDict.Add("Street", "Address");
            myDict.Add("Suburb", "Address");
            myDict.Add("City", "Address");
            var keys = myDict.Where(x => x.Value == "Name" || x.Value == "Address").Select(x => x.Key).ToList();

You can refer to this link: LINQ: Getting Keys for a given list of Values from Dictionary and vice versa

Here is the result :

Best Regards,

YongQing.