如果是多个数组列表，我可以将它们存储在某处并调用它们，还是需要为每个 AL 创建单独的类

Question

在我的应用程序中，我有多个数组列表（在我的情况下超过 20 个），试图找到一种方法将它们存储在某个地方并在可能的情况下将它们回调。就像 VB 模块中的旧方法一样。这是我的代码！

模型类代码

公开课联系人

public class Contacts
{
    [PrimaryKey][AutoIncrement]
    public int Contact_ID { get; set; }
    public string Contact_Name { get; set; }
    public string Contact_Address { get; set; }
    public string Contact_eMail { get; set; }
}

---

主页

`public partial class MainPage : ContentPage
{
    readonly SQLiteAsyncConnection _connection 
        = DependencyService.Get<ISQLite>().GetConnection();

    public MainPage()
    {
        InitializeComponent();
        this.BindingContext = this;
    }

    protected override void OnAppearing()
    {
        base.OnAppearing();

        // I have more than 20 This type of Array Lists, and some contains 
        more than 30 items 
        
        int[] intArray;
        intArray = new int[4];
        intArray[0] = 13;
        intArray[1] = 14;
        intArray[2] = 18;
        intArray[3] = 21;

        var list = _connection.Table<Contacts>().ToListAsync().Result;
        var myAL = new ArrayList();
        foreach (int rowList in intArray)
        {
            var NewItem = list.Where(x => x.Contact_ID.Equals(rowList));
            myAL.Add(NewItem.FirstOrDefault());
        }

        listView.ItemsSource = myAL;
    }
}`

---

XAML 页面

`<StackLayout>
    <ListView x:Name="listView" HasUnevenRows="True"  IsVisible="True">
        <ListView.ItemTemplate>
            <DataTemplate>
                <ViewCell>
                    <StackLayout Orientation="Vertical" VerticalOptions="CenterAndExpand">
                        <Frame BackgroundColor="LightYellow">
                            <StackLayout Orientation="Vertical" VerticalOptions="Center" >
                                <Label Text="{Binding Contact_Name}" HorizontalOptions="StartAndExpand" TextColor="Black" FontSize="Medium"></Label>
                                <Label Text="{Binding Contact_Address}" HorizontalOptions="StartAndExpand" TextColor="Black" FontSize="Medium"></Label>
                                <Label Text="{Binding Contact_eMail}" HorizontalOptions="StartAndExpand" TextColor="Black" FontSize="Medium"></Label>
                            </StackLayout>
                        </Frame>
                    </StackLayout>
                </ViewCell>
            </DataTemplate>
        </ListView.ItemTemplate>
    </ListView>
</StackLayout>`

---

Screen shot

Answer 1

这是一个简单的示例：

为数组列表创建类MyArrayData（例如这里有两个列表）：

public class MyArrayData
{
   public IList<string> StringArray { get; set; }
   public IList<int> IntArray { get; set; }
}

那么你可以像这样保存它：

MyArrayData dataArray = new MyArrayData() { IntArray = new List<int>() { 1,2, 3, 4 }, StringArray = new List<string>() { "A", "B", "C" } };
string jsonString = JsonConvert.SerializeObject(dataArray);
Preferences.Set("list", jsonString);

用钥匙搞定：

string dateJason = Preferences.Get("list", "");
MyArrayData myArrayData = JsonConvert.DeserializeObject<MyArrayData>(dateJason);
var intArray = myArrayData.IntArray;
var stringArray = myArrayData.StringArray;