Delete from List<> collection

Seth Debug

4y1.1kC#

Hi,

A collection is defined as follows for a class with UrunID, UrunAdi, UrunKategorisi, UrunFiyati properties.

List Urunler = new List();
Urun urun = new();
urun.UrunID = Convert.ToInt32(txtUrunID.Text);
urun.UrunAdi = txtUrunAdi.Text;
urun.UrunKategori = txtUrunKategori.Text;
urun.UrunFiyati = Convert.ToDecimal(txtUrunFiyati.Text);
Urunler.Add(urun);
dgvUrunler.DataSource = "";
dgvUrunler.DataSource = Urunler;

how to create add, delete, update and search methods for above collection?

Thanks.

7 Replies

Know the answer? Post it — somebody with the same question will find it here.

Sachin Singh4y ago
Accepted answer
A normal Generic list have following methods
List list= new List();
list.Add(new ClassName(){ //properties});
list.RemoveAt(//Index position);
list.Remove(//specific object using object reference); // list.Remove(obj1);
list.find(index);
list.AddRange(//object collection);
On top of that
list.Where(x=>x.columnName==anyCondition);
Jaydeep Patil4y ago
Check this URL in that you get all the operations related to list
https://www.tutorialsteacher.com/csharp/csharp-list

Seth Debug4y ago

Source codes are below. I need to provide transaction through Windows Form.

Muhammad Imran Ansari4y ago
Check the following link to perform various operatoins on a List.
https://www.c-sharpcorner.com/UploadFile/c25b6d/create-a-list-in-C-Sharp-and-various-operations-on-list/
Vishal Yelve4y ago
Update
var result = from r in list where r.ProductID == 2 select r;
result.First().ProductName = “HP Laptop”;
Vishal Yelve4y ago
for Search
List<int> list = new List<int> { 1, 2, 3, 4, 5 };
        int target = 3;

        bool isExist = list.find(target);
        if (isExist) {
            Console.WriteLine("Element found in the list");
        }
        else {
            Console.WriteLine("Element not found in the given list");
        }
Vishal Yelve4y ago
Do you want to add or remove it from the list?

Add Example
var resultList = new List<int>();
resultList.Add(1);
resultList.Add(2);
resultList.Add(3);
OR
List authors = new List
{
    new Author { Name = "Mahesh Chand", Book = "ADO.NET Programming", Price = 49.95 },
    new Author { Name = "Neel Beniwal", Book = "Jump Ball", Price = 19.95 },
    new Author { Name = "Chris Love", Book = "Practical PWA", Price = 29.95 }
};
// Add more items to the list
authors.Add(new Author { Name = "Mahesh Chand", Book = "Graphics with GDI+", Price = 49.95 });
authors.Add(new Author { Name = "Mahesh Chand", Book = "Mastering C#", Price = 54.95 });
authors.Add(new Author { Name = "Mahesh Chand", Book = "Jumpstart Blockchain", Price = 44.95 });
Remove
// Removes the number 1 from the index 0 in the list
resultlist.RemoveAt(0);

// Allows you to remove an Object from the list instead
var itemToRemove = resultlist.Single(r => r.Id == 2);
resultList.Remove(itemToRemove);