site stats

Get key name from dictionary c#

WebOct 24, 2009 · var dict = new Dictionary> (); Then to access it: var kvp = dict [key]; // key is of type a. a itemKey = kvp.key; b itemVal = kvp.value; So, code … WebAug 29, 2012 · If you want to check first, you can use TryGetValue like this: string xmlfile; if (!Data_Array.TryGetValue ("XML_File", out xmlfile)) { // the key isn't in the …

How to access the values in a dynamic dictionary in C#?

WebIDictionary numberNames = new Dictionary (); numberNames.Add (1,"One"); //adding a key/value using the Add () method numberNames.Add (2,"Two"); numberNames.Add (3,"Three"); //The following throws run-time exception: key already added. //numberNames.Add (3, "Three"); foreach(KeyValuePair kvp in numberNames) … WebYou shouldn't be using LINQ to find a key in a Dictionary - the Dictionary has more efficient methods for doing that - ContainsKey / indexer pair or more optimal TryGetValue. For instance: int key = 2; (A) var result = dic.ContainsKey (key) ? dic [key].Where (x => x == true).ToList () : new List (); (B) fiy wine types https://cantinelle.com

c# - Best way to change dictionary key - Stack Overflow

WebC# // To get the keys alone, use the Keys property. Dictionary.KeyCollection keyColl = openWith.Keys; // The elements of the KeyCollection are … WebSep 28, 2016 · What you need is fetch the key collection from Dictionary and use them to fetch the values stored in the Dictionary. foreach (var key in result.Keys) { var value = result [key]; } Solution is based on code … fiyyaz pirani net worth

c# - Get dictionary key object properties - Stack Overflow

Category:Store reference to an object in dictionary in C# - iditect.com

Tags:Get key name from dictionary c#

Get key name from dictionary c#

C#快速高效率复制对象另一种方式 表达式树_ss_get_Name

Web5. You shouldn't be using LINQ to find a key in a Dictionary - the Dictionary has more efficient methods for doing that - ContainsKey / indexer pair or more optimal … WebApr 10, 2024 · 在代码中经常会遇到需要把对象复制一遍，或者把属性名相同的值复制一遍。 再或者给另一个类StudentSecond的属性赋值，两个类属性的名称和类型一致。 当然最 …

Get key name from dictionary c#

Did you know?

Web1. Visual Studio's UserVoice gives a link to generic OrderedDictionary implementation by dotmore. But if you only need to get key/value pairs by index and don't need to get … WebNov 30, 2009 · IEnumerator enumerator = dictionary.Keys.GetEnumerator (); enumerator.MoveNext (); object first = enumerator.Current; Ideally one would check that …

WebIn this example, we create a Dictionary and create an instance of the MyObject class. We then add the object to the dictionary using a string key ("myKey") and the Add method. To retrieve the object from the dictionary, we use the key to index into the dictionary and cast the result to the MyObject class. WebOct 8, 2014 · Dictionary test = new Dictionary (); test.Add ("Key1","Value1"); string error = test ["Key2"]; Often times, something like an object will be the key, which undoubtedly makes it harder to get. However, you can always write the following (or even wrap it up in an extension method):

http://www.dedeyun.com/it/csharp/98761.html WebFeb 24, 2024 · To retrieve your item, you need to use the same item (the same reference). You can do it in such way: var myDouble = myDictonary [item]; When you use object as …

WebApr 29, 2012 · Edit: Here's an approach using a Dictionary and the ElementAt method: var rnd = new Random (); var randomEntry = dict.ElementAt (rnd.Next (0, dict.Count)); String randomKey = randomEntry.Key; String randomValue = randomEntry.Value;

WebMay 27, 2024 · Get dictionary key by min value: double min = results.OrderBy (x => x.Value).First ().Key; Get dictionary key by second max value: double min = results.OrderByDescending (x => x.Value).Skip (1).First ().Key; Get dictionary key by second min value: double min = results.OrderBy (x => x.Value).Skip (1).First ().Key; … cannon fire direction specialistWebIf you need to extract the Key where the element value is equal to the integer generated randomly, you can use the following function: public string getCard (int random) { return Karta._dict.FirstOrDefault (x => x.Value == random).Key; } Make sure that you added reference to System.Linq in your class. using System.Linq; fizaammar ymail.comWebApr 10, 2024 · 在代码中经常会遇到需要把对象复制一遍，或者把属性名相同的值复制一遍。 再或者给另一个类StudentSecond的属性赋值，两个类属性的名称和类型一致。 当然最原始的办法就是把需要赋值的属性全部手动手写。这样的效率是最高 ... fiz1 antibodyWeb2 days ago · Since the copy of the dictionary is made while the lock is held there should be no risk that the dictionary is read and written to concurrently. And concurrent reads are safe: A Dictionary can support multiple readers concurrently, as long as the collection is not modified fiza ali bridal makeover shootWebIf you need to extract an element key based on an index, this function can be used: public string getCard(int random) { return Karta._dict.ElementAt(random).Key; } If you need to … can non filers still apply for stimulus checkWebAug 17, 2013 · If you've already got a dictionary, I'd avoid reflection and just use DynamicObject. For example: public class DynamicDictionary : DynamicObject { private readonly Dictionary dictionary; public DynamicDictionary(Dictionary dictionary) { this.dictionary = … cannonfire and funeralsWebMar 8, 2010 · 1 Answer Sorted by: 51 I think this may be what you are looking for: Dictionary dictionary = new Dictionary (); Type [] arguments = … fiza ali baby shower