c# - 如何设置ListView的ItemsSource？

Question

这里我定义了我的数据myListOfEmployeeObjects:

public class App : Application
{
    public List<Employee> myListOfEmployeeObjects;

    public App ()
    {
        Employee emp1 = new Employee () {
            FirstName = "Max",
            LastName = "Mustermann",
            Twitter = "@fake1"
        };
        Employee emp2 = new Employee () {
            FirstName = "Evy",
            LastName = "Mustermann",
            Twitter = "@fake2"
        };
        myListOfEmployeeObjects = new List<Employee> {
            emp1, emp2
        };
        MainPage = new NavigationPage (new EmployeeListPage ());
    }
}

比起我的 XAML，我在其中设置了 ItemsSource:

<ListView x:Name="listView"
                IsVisible="false"
                ItemsSource="{x:Static local:App.myListOfEmployeeObjects}"
                ItemSelected="EmployeeListOnItemSelected">

这应该有效吗？因为我得到

Xamarin.Forms.Xaml.XamlParseException: Type App not found in xmlns

public partial class EmployeeListPage : ContentPage {

    private ListView listView;

    private void InitializeComponent() {
        this.LoadFromXaml(typeof(EmployeeListPage)); // here the exception is thrown
        listView = this.FindByName <ListView>("listView");
    }
}

如何设置 XAML 的 ItemsSource？

编辑:

现在我尝试了 user2425632 的建议如果我进行以下更改，它就会起作用:

1. 将 xmlns:local="clr-namespace:HelloXamarinFormsWorld;assembly=HelloXamarinFormsWorld" 添加到我的 XAML 文件

现在看起来像下面这样

<?xml version="1.0" encoding="UTF-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:HelloXamarinFormsWorld;assembly=HelloXamarinFormsWorld"
             x:Class="HelloXamarinFormsWorld.EmployeeListPage"
             Title="Employee List">
    <ContentPage.Content>

当然，您必须更改名称以适合您的项目。

1. 显示 ListView

我删除了 IsVisible 和 ItemSelected。

<ListView ItemsSource="{x:Static local:App.myListOfEmployeeObjects}">

1. 让一切都静态化

它必须是静态的，否则你会得到

No static member found for local:App.myListOfEmployeeObjects

public static List<Employee> myListOfEmployeeObjects { private set; get; }

public static void GetAllEmployees(){
    Employee emp1 = new Employee () {
        FirstName = "Max",
        LastName = "Mustermann",
        Twitter = "@fake1"
    };
    Employee emp2 = new Employee () {
        FirstName = "Eva",
        LastName = "Mustermann",
        Twitter = "@fake2"
    };
    myListOfEmployeeObjects = new List<Employee> {
        emp1, emp2
    };
}

public App ()
{
    GetAllEmployees ();
    MainPage = new NavigationPage (new EmployeeListPage ());
}

Answer 1

所以我实际上并没有抽出时间自己做这件事，但是通过阅读文档我有一个建议可能值得你尝试。

ItemsSource="{x:Static local:App.myListOfEmployeeObjects}"

在您的 xaml 中，您说过源是静态的，但查看您的 .cs 文件却不是。尝试以下操作:

public static List<Employee> myListOfEmployeeObjects { private set; get; }

然后尝试使用静态函数设置对象，例如:

static App() {
    myListOfEmployeeObjects = something;
}

然后该列表应该在页面上可见。

我使用了以下您可能会觉得有用的链接:

Xamarin documentation on data-binding

Example cs code

Example xaml code

希望对您有所帮助。