C# foreach remove item from list
WebAug 17, 2009 · You can use store in hashtable the ones that should be removed, then to remove them: Code Snippet Hashtable toRemove = new Hashtable (); bool FOUND; foreach (Equipment tmpEQ in equipments) if (!toRemove.Contains (tmpEQ)) { FOUND = false; foreach (DataRow dr in EQTable.Rows) if (dr ["EQUIPMENT"].ToString () == … WebThe second approach is a nice thought, but C# dictionaries are mutable and it's neither idiomatic nor efficient to copy them around if you can accomplish the same thing with mutation. This is a typical way: var itemsToRemove = myDic.Where(f => f.Value == 42).ToArray(); foreach (var item in itemsToRemove) myDic.Remove(item.Key);
C# foreach remove item from list
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Web好吧，沒有什么可以刪除，因為你的列表是空的（你也沒有給它一個標識符，所以你的代碼將無法編譯）。 您可以使用Remove(T item)或RemoveAt(int index)分別刪除指定索引處的對象或對象（一旦實際包含某些內容）。. 受控代碼示例： WebMay 9, 2024 · You don't need an index, as the List class allows you to remove items by value rather than index by using the Remove function. foreach (car item in list1) list2.Remove (item); Share Improve this answer Follow answered Apr 30, 2010 at 15:15 Adam Robinson 181k 35 285 342 5
WebSep 19, 2014 · foreach (GameObject ArrayListUnit in new ArrayList (SelectedUnitList)) You have initialized redundant ArrayList and used it just for iteration. But when you remove from ArrayList within foreach loop it is from actual ArrayList i.e. SelectedUnitList. Conculsion: Use for loop to avoid redundancy and removing from the ArrayList. Share WebApr 9, 2024 · The line brothers.RemoveAt(i) is the one throwing the Index Out of Bounds Exception.This is because that method uses the zero based index to locate the val3 element in the list and the index 3 will be out of bounds as the index of the last element in your list is 2. If you wish to remove a certain element in the list and replace it with another then the …
WebI have List I am passing from model to control and back again. 我有List我正在从模型传递到控制并再次返回。 My initial problem was that when I use List.remove() to remove an item from the list<> it is somehow coming back when passing it back to the View. 我最初的问题是，当我使用List.remove()从list<>删除一个项目时，它在将它传递 … WebApr 6, 2024 · To remove an item from List in C# we use Remove (), RemoveAt () and RemoveRange () methods. These methods remove the item from List based on either its index or value. In the next few examples, you’ll learn how to implement these. C# Program to Remove Item From List Using Remove () Method
WebTo remove items from a list while iterating in C#, you should iterate through the list in reverse order. This ensures that you don't skip any elements and don't get an InvalidOperationException due to a modified collection. You can use a for loop with a decrementing index to achieve this.. Here's an example of how to remove items from a …
Web我有一個List lt gt Generic .generic類內部有變量，例如variable ， variable ， variable .... 我想創建一個泛型類的新實例，其值來自此列表中的特定項，其中泛型的variable some value 謝謝 ： recap white lotusWebYou are removing the item during a foreach, yes? Simply, you can't. There are a few common options here: use List and RemoveAll with a predicate iterate backwards by index, removing matching items for (int i = list.Count - 1; i >= 0; i--) { if ( {some test}) list.RemoveAt (i); } recap westworld season 4 episode 7WebSep 9, 2015 · Try just creating another temporary list for the items that need to be deleted then when your done looping you can just delete the ones in the temp list. List temp = new List() foreach(item in mainList) { if (item.Delete) { temp.Add(item); } } … university of washington greek reportWebThis line data.RemoveAt (i--); is stopping the effect of increment in the iteration variable at the end of the loop, in case of item being removed from the list. It will remove the item from index at the current iteration value and then after removing the item, the iterator would be set to one less value than the current one. recap when calls the heartWebI am trying to remove from a list in a list where there are null. For Example: responses.Questions[0].Options[0].Value = "asdf"; responses.Questions[0].Options[1].Value = null; responses.Questions[0].Options[2].Value = 1; I want to remove the second options in the list because the value is null. So When I am done I have a list like so: recap what we do in the shadowsWebMay 12, 2009 · Or you could remove all items in authors in a second pass. var authorsList = GetAuthorList (); var authors = authorsList.Where (a => a.FirstName == "Bob").ToList (); foreach (var author in authors) { authorList.Remove (author); } Share Improve this answer answered May 12, 2009 at 16:02 Daniel Brückner 58.7k 16 98 143 19 recap wide mouth lidWebAug 7, 2015 · Finally you would need to loop over the indexes to be deleted in reverse order and remove each from the original collection. list itemsToDelete for (int i = 0; i < items.Count; i++) { if (shouldBeDeleted (items [i])) { itemsToDelete.Add (i); } } foreach (int index in itemsToDelete.Reverse ()) { items.RemoveAt (i); } Share recap westworld season 4 episode 4