Question

很抱歉有关ListViewItems的新手问题，但之前从未使用过ListView，我尝试做的是将所有ListViewItems从AnimalManager类返回给用户界面lsbOverview控制。这种方法的原因是我有一个Manager类来处理所有数据并将其返回给UI控件。问题是如何将所有项目还原回lsboverView ListView？

    // declared in AnimalManager class
    private static List<Animal> AnimalList { get; set; }


     public static ListViewItem DisplayAllAnimals()
    {
        //Show animals on ListView by proper column
        foreach (var animal in AnimalList)
        {
            ListViewItem item = new ListViewItem(animal.Id); // generated ID
            item.SubItems.Add(animal.AnimalSort); // AnimalSort
            item.SubItems.Add(animal.Name); //Name
            item.SubItems.Add(animal.Age); //Age
            item.SubItems.Add(animal.Gender.ToString()); // Animal gender

            return item;
        }

        // how to return all items back to UI ?
    }


    // Mainform UI class where its used
    lsbOverview.Items.Add(AnimalManager.DisplayAllAnimals());

Answer 1

你在找这个吗？

// declared in AnimalManager class
    private static List<Animal> AnimalList { get; set; }


     public static ListViewItem[] DisplayAllAnimals()
    {
        //Show animals on ListView by proper column
        var listViewItems = new List<ListViewItem>();
        foreach (var animal in AnimalList)
        {
            ListViewItem item = new ListViewItem(animal.Id); // generated ID
            item.SubItems.Add(animal.AnimalSort); // AnimalSort
            item.SubItems.Add(animal.Name); //Name
            item.SubItems.Add(animal.Age); //Age
            item.SubItems.Add(animal.Gender.ToString()); // Animal gender
            listViewItems.Add(item);

        }

        return listViewItems.ToArray();
    }


    // Mainform UI class where its used
    lsbOverview.Items.AddRange(AnimalManager.DisplayAllAnimals());

Answer 2

我认为你想要的是：

    // declared in AnimalManager class
    private static List<Animal> AnimalList { get; set; }


     public static IEnumerable<ListViewItem> DisplayAllAnimals()
    {
        //Show animals on ListView by proper column
        foreach (var animal in AnimalList)
        {
            ListViewItem item = new ListViewItem(animal.Id); // generated ID
            item.SubItems.Add(animal.AnimalSort); // AnimalSort
            item.SubItems.Add(animal.Name); //Name
            item.SubItems.Add(animal.Age); //Age
            item.SubItems.Add(animal.Gender.ToString()); // Animal gender

            yield return item;
        }
    }


    // Mainform UI class where its used
    lsbOverview.Items.AddRange(AnimalManager.DisplayAllAnimals().ToArray());

编辑：请注意AddRange调用而不是Add。有关IEnumerable＆lt;＆gt;的更多信息和产量我会建议谷歌或在这里搜索更深入的了解。

Answer 3

我认为构建一系列动物，然后在listview上使用AddRange可以解决这个问题：

public static List<ListViewItem> DisplayAllAnimals()
{
    var animals = new List<ListViewItem>();

    //Show animals on ListView by proper column
    foreach (var animal in AnimalList)
    {
        ListViewItem item = new ListViewItem(animal.Id); // generated ID
        item.SubItems.Add(animal.AnimalSort); // AnimalSort
        item.SubItems.Add(animal.Name); //Name
        item.SubItems.Add(animal.Age); //Age
        item.SubItems.Add(animal.Gender.ToString()); // Animal gender

        animals.Add(item);
    }

    return animals;
}


lsbOverview.Items.AddRange(AnimalManager.DisplayAllAnimals().ToArray());

Answer 4

您可以使用yield return返回IEnumerable<ListViewItem>

public static IEnumerable< ListViewItem> DisplayAllAnimals()
{
    //Show animals on ListView by proper column
    foreach (var animal in AnimalList)
    {
        ListViewItem item = new ListViewItem(animal.Id); // generated ID
        item.SubItems.Add(animal.AnimalSort); // AnimalSort
        item.SubItems.Add(animal.Name); //Name
        item.SubItems.Add(animal.Age); //Age
        item.SubItems.Add(animal.Gender.ToString()); // Animal gender

        yield return item;
    }


}

您可以将其用作：

lsbOverview.Items.AddRange(AnimalManager.DisplayAllAnimals().ToArray());

如何返回ListViewItems的集合？

4 个答案: