WebAug 14, 2024 · On the left side of the operator you add a single item whereas on the right side you're adding a new list. Use a simple if instead: if (!urlDictionary.ContainsKey (url.Authority)) urlDictionary [url.Authority] = new List (); urlDictionary [url.Authority].Add (url); Share Improve this answer Follow edited Aug 14, 2024 at 13:56 Servy WebDec 21, 2011 · public IEnumerable GetStrings (KeyValuePair> kvp) { List result = new List (); result.Add (kvp.Key); result.AddRange (kvp.Value.Select (s => "\t" + s)); return result; } Then you could do this: List result = theDictionary .SelectMany (kvp => GetStrings (kvp)).ToList (); Or generically:
[解決済み] なぜDictionaryにはAddRangeがないのですか?
WebApr 13, 2024 · 本文主要汇总了在开发过程中,使用List和Dictionary常用的方法,例如增、删、改、查、排序等等各种常用操作。 在平时的开发过程中,List和Dictionary是我们经常使用到的数据结构,而且由于本人记性又差有些方法长时间不用就都忘了,所以总结出此博 … WebMar 14, 2024 · C# program to print the list of all possible substrings of a specified string. C# program to count the total number of digits in an alpha-numeric string. C# program to concatenate the two strings using a predefined method. C# program to reverse a given string without using the predefined method. le coacher
Dictionaryの拡張メソッド 36選 - Qiita
WebJul 13, 2011 · The closest I've got is: Dictionary MyDictionary = new Dictionary (); // Populate MyDictionary here. Grid1.DataSource = MyDictionary.Values; Grid1.DataBind (); This binds the properties in myObject to the gridview, but I'd like to get the key as well. WebDictionary AddRange Add an enumeration of items to a dictionary. There are times when you may want to simply add to a dictionary at different points in the pipe, instead of always creating it from a given set of entities This extension allows you to add items to a dictionary from a select statement, or some other enumerable. Source WebMay 17, 2011 · As others have mentioned, the reason why Dictionary.AddRange is not implemented is because there are various ways … le coach cherbourg