C# list remove item in foreach
WebSep 9, 2015 · So use a for-loop instead. for (int i = linelijst.count - 1; i >= 0; i--) { // linelijst [i] can be removed, etc. } Should be noted that when the item is removed you'd want to subtract one from the index so you don't skip anything, or if … 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
C# list remove item in foreach
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WebSep 15, 2024 · So if you want to remove a book from a list you would not necessarily use a foreach loop. Simplest way would be to use the RemoveAll function on List. public void RemoveBook (int bookId) => Books.RemoveAll (book => book.Id == bookId); Share Improve this answer Follow edited Dec 17, 2024 at 6:37 answered Dec 14, 2024 at 12:43 Magnus … WebApr 24, 2024 · materialUsed[0] is the first item of your list, and whetever the number of items the list has you take always the first, you should take the current item "material" Share. Improve this answer. Follow ... C# Foreach item in CheckedListBox only gets one item. Hot Network Questions
WebC# public bool Remove (T item); Parameters item T The object to remove from the List. The value can be null for reference types. Returns Boolean true if item is … 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 …
WebHere is the code for the Add Button and the Remove Button: Add: protected void btnAdd_Click (object sender, EventArgs e) { foreach (ListItem item in lstAvailableColors.Items) { if (item.Selected) { lstSelectedColors.Items.Add (item); lstAvailableColors.Items.Remove (item); } } } Remove: WebMar 29, 2014 · list = list.Distinct ().ToList (); It's well worth looking into LINQ for data operations - it can make things much simpler. As for what's wrong with your current code - there are a couple of things: Firstly, you're removing by item rather than by index, which will remove the first occurrence of that item, not the one you're actually looking at
WebRemarks. The Action is a delegate to a method that performs an action on the object passed to it. The elements of the current List are individually passed to the Action delegate. This method is an O ( n) operation, where n is Count. Modifying the underlying collection in the body of the Action delegate is not supported and causes ...
WebJul 13, 2024 · Using For/Foreach to Remove Elements From a Generic List The simplest solution is to do the same thing as in the naive example, only go backward with a for … お札 顔文字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. passive antenna combinerWebJun 8, 2024 · Sometimes, when looping over a collection of elements in C#, you need not only the items itself, but also its position in the collection. ... How to get the index of the current element in a foreach loop? The easiest way is to store and update the index in a separate variable. List< string > myFriends = new List< string > ... passive and residual incomeWebI 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 … お札 顔 折るお札 願い事WebApr 10, 2024 · 方法 リスト (List)の指定した範囲を削除するには、 RemoveRange () を使います。 まず、リストからRemoveRange ()を呼び出します。 そして、RemoveRange ()の第1引数に範囲の最初の位置、第2引数に範囲の要素数を指定します。 //myList=対象のリスト, startIndex=範囲の最初の位置, length=範囲の要素数 myList.RemoveRange (startIndex, … passive antenna boosterWebOct 28, 2014 · Use the RemoveWhere method of HashSet instead: hashset.RemoveWhere (s => s == "somestring"); You specify a condition/predicate as the parameter to the method. Any item in the hashset that matches the predicate will be removed. This avoids the problem of modifying the hashset whilst it is being iterated over. In response to your … お札 顔 条件