在C＃中动态创建Collection

Question

I have an application that will continuously taking user's input and store the input in a List of class ItemsValue

How am I going to make it so that once the collection reaches 1000 counts, it will "stop" and a new collection will be created and so on.

For example:

List<ItemsValue> collection1 = new List<ItemsValue>();
//User input will be stored in `collection1`
if (collection1.count >= 1000)
    //Create a new List<ItemsVales> collection2, 
    //and the user input will be stored in collection2 now.
    //And then if collection2.count reaches 1000, it will create collection3. 
    //collection3.count reaches 1000, create collection4 and so on.

Answer 1

I don't know why, but you want a "list of lists": List<List<ItemsValue>> .

List<List<ItemsValue>> collections = new List<List<ItemsValue>>();
collections.Add(new List<ItemsValue>());

collections.Last().Add(/*user input*/);

if (collections.Last().Count >= 1000) collections.Add(new List<ItemsValue>());

Answer 2

I think you need List<List<ItemsValue>>

List<List<ItemsValue>> mainCollection = new List<List<ItemsValue>>();
int counter = 0;
if (counter == 0) mainCollection.Add(new List<ItemsValue>());

if(mainCollection[counter].Count < 1000) mainCollection[counter].Add(item);

else 
{
    mainCollection.Add(new List<ItemsValue>());
    counter++;
    mainCollection[counter].Add(item);
}

I don't know how is the rest of your code look like,but I would make that counter static.

Answer 3

Use a list of collections. If you have fixed size you can use a array instead of a list.

List<List<ItemsValue>> collections = new List<List<ItemsValue>>({new List<ItemsValue>()});
if(collections[collections.Count- 1].Count >= 1000)
{
   var newCollection = new List<ItemsValue>();
   // do what you want with newCollection
   collections.Add(newCollection);
}

Answer 4

Try this:

List<List<ItemsValue>> collections = new List<List<ItemsValue>>({new List<ItemsValue>()});

if(collections[collections.Count-1].Count >= 1000)
{
    collections.Add(new List<ItemsValue>());
}

Use the above if statement when you're adding an item to collections. To add an item to collections, use the following:

collections[collections.Count-1].Add(yourItem);