[英]How to show data from ASP.NET Web Application to Xamarin.Forms?
我希望在ASP.NET Web应用程序中创建的所有记录都可以在我的移动应用程序Xamarin.Forms中显示。 我的程序正在发生的事情是,我能够在Web应用程序中创建记录并将其保存,但无法使其显示在Xamarin.Forms Mobile应用程序中。 我创建了一个MainViewModel,它将从已绑定到MainPage的Web应用程序中获取记录。 这些是我的代码:
MainPageMain.xaml
<?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:XamarinDemoApp"
x:Class="XamarinDemoApp.MainPageMain"
xmlns:ViewModels="clr-namespace:XamarinDemoApp.ViewModels;assembly=XamarinDemoApp"
BackgroundColor="Teal"
Title=" Title Bar">
<ContentPage.BindingContext>
<ViewModels:MainViewModel/>
</ContentPage.BindingContext>
<StackLayout Orientation="Vertical">
<ListView ItemsSource="{Binding EmployeesList}"
HasUnevenRows="True">
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<StackLayout Orientation="Horizontal">
<Label Text="{Binding Name}"
FontSize="24"/>
<Label Text="{Binding Department}"
FontSize="24"/>
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
<Label Text="This is the MainPage"/>
</StackLayout>
MainViewModel.cs
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;
using XamarinDemoApp.Models;
using XamarinDemoApp.Services;
namespace XamarinDemoApp.ViewModels
{
public class MainViewModel : INotifyPropertyChanged
{
private List<Employee> _employeesList;
public List<Employee> EmployeesList
{
get { return _employeesList; }
set
{
_employeesList = value;
OnPropertyChanged();
}
}
public MainViewModel()
{
InitializeDataAsync();
}
private async Task InitializeDataAsync()
{
var employeesServices = new EmployeesServices();
EmployeesList = await employeesServices.GetEmployeesAsync();
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
PropertyChanged.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
}
制作一个单独的API控制器,可用于将EmployeeList作为JSON对象调用。 那是做这种事情的首选方法。 例:
public class EmployeeApiController : ApiController
{
[HttpGet]
public async Task<List<Employee>> Get()
{
return await employeesServices.GetEmployeesAsync();
}
}
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