如何從通用列表中刪除項目

Question

我有一個通用列表

如何刪除項目？

EX：

Class Student
{
    private number;
    public Number
    {
        get( return number;)
        set( number = value;)
    }

    private name;
    public Name
    {
        get( return name;)
        set( name = value;)
    }

    main()
    {
        static List<student> = new list<student>();

        list.remove...???
    }
}

Answer 1

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：

void Main(...)
{
    var list = new List<Student>();
    Student s = new Student(...);
    list.Add(s);

    list.Remove(s); //removes 's' if it is in the list based on the result of the .Equals method

    list.RemoveAt(0); //removes the item at index 0, use the first example if possible/appropriate
}

Answer 2

根據您的意見，我得出結論，您從輸入中讀取學生姓名，您需要刪除具有指定姓名的學生。

class Student {
    public string Name { get; set; }
    public int Number { get; set; }

    public Student (string name, int number)
    {
        Name = name;
        Number = number;
    }
}


var students = new List<Student> {
    new Student ("Daniel", 10),
    new Student ("Mike", 20),
    new Student ("Ashley", 42)
};

var nameToRemove = Console.ReadLine ();
students.RemoveAll (s => s.Name == nameToRemove); // remove by condition

請注意，這將刪除所有具有指定姓名的學生。

如果您需要刪除按名稱找到的第一個學生，請先使用First方法找到他，然后為實例調用Remove ：

var firstMatch = students.First (s => s.Name == nameToRemove);
students.Remove (firstMatch);

如果您想要在刪除之前確保只有一名學生具有指定名稱，請以類似的方式使用Single ：

var onlyMatch = students.Single (s => s.Name == nameToRemove);
students.Remove (onlyMatch);

請注意，如果沒有一個項與謂詞匹配，則Single調用將失敗 。

Answer 3

List<Student> students = new List<Student>();
students.Add(new Student {StudentId = 1, StudentName = "Bob",});
students.RemoveAt(0); //Removes the 1st element, will crash if there are no entries

或刪除已知學生。

//Find a Single Student in the List.
Student s = students.Where(s => s.StudentId == myStudentId).Single();
//Remove that student from the list.
students.Remove(s);

Answer 4

int count = queue.Count;

        while(count>0)
        {
            HttpQueueItem item = queue[0];
            /// If post succeeded..
            if (snd.IsNotExceedsAcceptedLeadsPerDayLimit(item.DataSaleID, item.AcceptedLeadsPerDayLimit) && snd.PostRecord(item.DataSaleDetailID, item.PostString, item.duplicateCheckHours, item.Username, item.Password, item.successRegex))
            {
                if (item.WaitTime > 0)
                    Thread.Sleep(item.WaitTime);
                queue.Remove(item);
            }
                ///If Exceeds Accepted leads per day limit by DataSale..
            else if (!snd.IsNotExceedsAcceptedLeadsPerDayLimit(item.DataSaleID, item.AcceptedLeadsPerDayLimit))
            {
                queue.RemoveAll(obj => obj.DataSaleID == item.DataSaleID);
            }
                /// If Post failed..
            else //if (!snd.PostRecord(item.DataSaleDetailID, item.PostString, item.duplicateCheckHours, item.Username, item.Password, item.successRegex))
            {
                queue.Remove(item);
            }
            count = queue.Count;
        }

Answer 5

要從網格視圖中的通用列表中刪除行或記錄，只需編寫此代碼 -

List<Address> people = new List<Address>();
Address t = new Address();
people.RemoveAt(e.RowIndex);
grdShow.EditIndex = -1;
grdShow.DataSource = people;
grdShow.DataBind();

Answer 6

好吧，你沒有給你的列表一個名字，你的一些語法是不可思議的。

void main()
{
   static List<Student> studentList = new List<Student>();
}

// later
void deleteFromStudents(Student studentToDelete)
{
   studentList.Remove(studentToDelete);
}

這里有更多刪除函數： C＃List Remove Methods

Answer 7

試試linq：

  var _resultList = list.Where(a=>a.Name != nameToRemove).Select(a=>a);

Answer 8

我做了一個包含7張牌的程序，然后洗牌，我希望能夠幫助他們

class Program
{

    static void Main(string[] args)
    {
        Random random = new Random(); 
        var cards = new List<string>();
        //CARDS VECRTOR
        String[] listas = new String[] { "Card 1", "Card 2", "Card 3", "Card 4", "Card 5", "Card 6", "Card 7"};


        for (int i = 0; i<= cards.Count; i++)
        {

            int number = random.Next(0, 7); //Random number 0--->7


            for (int j = 0; j <=6; j++)
            {
                if (cards.Contains(listas[number])) // NO REPEAT SHUFFLE
                {

                    number = random.Next(0, 7); //AGAIN RANDOM

                }
                else
                {
                    cards.Add(listas[number]); //ADD CARD
                }
            }

        }

        Console.WriteLine(" LIST CARDS");

        foreach (var card in cards)
        {
            Console.Write(card + " ,");


        }

        Console.WriteLine("Total Cards: "+cards.Count);

        //REMOVE

        for (int k = 0; k <=6; k++)
        {
           // salmons.RemoveAt(k);
            Console.WriteLine("I take the card: "+cards.ElementAt(k));
            cards.RemoveAt(k); //REMOVE CARD
            cards.Insert(k,"Card Taken"); //REPLACE INDEX
            foreach (var card in cards)
            {
                Console.Write(card + " " + "\n");

            }


        }


        Console.Read(); //just pause

    }



}

Answer 9

也許您可以使用Dictionary<string, Student>而不是List<Student> 。

添加學生時，請添加其ID或名稱或任何可以唯一標識它的名稱。 然后你可以簡單地調用myStudents.Remove(myStudentId)