WebC# Dictionary Versus List Lookup Time Both lists and dictionaries are used to store collections of data. A Dictionary int, T > and List T > are similar, both are random … WebApr 27, 2024 · It's not about the original list not having duplicates. It's about the randomizer not choosing the same item twice. Separate issue: shuffling the list shuffles the actual list. Often that break other things which use the list, or simply makes it hard to debug. To do it without messing up the starting list, can shuffle a list of every index: 0,1 ...
c# - How to select random elements from list exclude some list?
WebMay 4, 2024 · } List _answers = new List (); private void BtnRandom_Click (object sender, EventArgs e) { MessageBox.Show (GetAnswer ()); } string GetAnswer () { Random rnd = new Random (); int i = 0; int _rnd = rnd.Next (_answers.Count); foreach (string answer in _answers) { if (i == _rnd) { return answer; } i++; } return ""; } } … WebGet random index and use list.items [randomIndex]. But I think that I retrieves all items from DB in this case. Create query to retrieve all ids from list, then select random id and use list.GetItemById (id). Get last record id, select random value from 0 to this id, try to get item by selected value. If an item does not exist, repeat steps. how to install a barn door with no header
Removing a random item from a list C# - Stack Overflow
WebOct 30, 2024 · To get a random element, what we want to do is use the ElementAtmethod of List, like this, mylist.ElementAt(someRandomNumber) Like arrays, a list has … WebJul 24, 2012 · You could utilise the Shuffle example posted in Randomize a List in C# in conjunction with the LINQ Take method to create an extension method on an IList, you'd need to ToList your selection prior to calling Random, unless you moved that inside the extension. public static List Random (this IList list, int takeNumber) { return … WebNov 7, 2008 · -- Random.Next() may produce a reasonably pseudo-random distribution of values, but it does not guarantee that the values will be unique. The probability of duplicate keys grows (non-linearly) with N until it reaches certainty when N reaches 2^32+1. The OrderBy QuickSort is a stable sort; thus, if multiple elements happen to get assigned the … jonathan schaul oklahoma