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我正在使用xamarin.forms我的項目中有兩個輸入字段。我需要使用API發佈數據。我已經在mvc中創建了API。 MVVM用於我的表單項目，我有一個服務類和viewmodel發佈的數據，但我不能傳遞數據查看模型。 我的觀點xamarin格式的數據綁定
public class testapi : ContentPage
{
#region View Model
public TestViewModel ViewModel { get; set; }
#endregion
bool isNewItem;
Entry name;
Entry age;
#region Constructor
public testapi()
{
#region Binding Context
ViewModel = new TestViewModel();
BindingContext = ViewModel.Testing;
#endregion
#region Using Triggers
var emptyValTrig = new EventTrigger();
emptyValTrig.Event = "TextChanged";
emptyValTrig.Actions.Add(new EmptyTextValidation());
#endregion
name = new Entry
{
Keyboard = Keyboard.Text,
TextColor = Color.Black,
BackgroundColor = Color.Default,
Placeholder = "Name",
VerticalOptions = LayoutOptions.Center,
HorizontalOptions = LayoutOptions.FillAndExpand,
};
name.SetBinding(Label.TextProperty, ("Name"));
name.Triggers.Add(emptyValTrig);
age = new Entry
{
Keyboard = Keyboard.Text,
TextColor = Color.Black,
BackgroundColor = Color.Default,
Placeholder = "Age",
VerticalOptions = LayoutOptions.Center,
HorizontalOptions = LayoutOptions.FillAndExpand,
};
age.SetBinding(Label.TextProperty, ("Age"));
age.Triggers.Add(emptyValTrig);
Button loginButton = new Button
{
Text = "Login",
BorderRadius = 5,
TextColor = Color.White,
BackgroundColor = Color.Gray,
Command = ViewModel.SelectionChangedCommand
};
var dataTrigger = new DataTrigger(typeof(Button));
dataTrigger.Binding = new Binding("Text.Length", BindingMode.Default, source: name);
dataTrigger.Value = 0;
dataTrigger.Setters.Add(new Setter { Property = Button.IsEnabledProperty, Value = false });
loginButton.Triggers.Add(dataTrigger);
var pageStack = new StackLayout();
pageStack.Children.Add(name);
pageStack.Children.Add(age);
pageStack.Children.Add(loginButton);
pageStack.Spacing = 10;
Content = pageStack;
}
#endregion
}
和我的視圖模型
public class TestViewModel : BaseViewModel
{
// Testing = new test();
public TestViewModel()
{
Testing = new test();
SelectionChangedCommand = new Command(async() =>
{
await RestaurantService.PostData<int, test>(RestaurantService.testdata, HttpMethod.Post, Testing).ContinueWith(test =>
{
}, TaskScheduler.FromCurrentSynchronizationContext());
});
}
private test _test;
public test Testing
{
get { return _test; }
set
{
_test = value;
OnPropertyChanged("Testing");
}
}
public System.Windows.Input.ICommand SelectionChangedCommand { get; set; }
}
和我有一個服務類太
class RestaurantService
{
public const string HostName = "http://192.168.0.44:100/api/";
public const string item = "Order";
public const string testdata = "Test";
public static async Task<T> PostData<T, Tr>(string endpoint, HttpMethod method,
Tr content)
{
T returnResult = default(T);
HttpClient client = null;
try
{
client = new HttpClient();
client.BaseAddress = new Uri(HostName);
client.DefaultRequestHeaders.Add("Accept", "application/json");
client.Timeout = new TimeSpan(0, 0, 15);
HttpResponseMessage result = null;
StringContent data = null;
if (content != null)
data = new StringContent(JsonConvert.SerializeObject(content), UTF8Encoding.UTF8, "application/json");
if (method == HttpMethod.Get)
result = await client.GetAsync(endpoint);
if (method == HttpMethod.Put)
result = await client.PutAsync(endpoint, data);
if (method == HttpMethod.Delete)
result = await client.DeleteAsync(endpoint);
if (method == HttpMethod.Post)
result = await client.PostAsync(endpoint, data);
if (result != null)
{
if (result.IsSuccessStatusCode
&& result.StatusCode == System.Net.HttpStatusCode.OK)
{
var json = result.Content.ReadAsStringAsync().Result;
returnResult = JsonConvert.DeserializeObject<T>(json);
}
}
}
catch (Exception ex)
{
Debug.WriteLine("Error fetching data: " + ex.Message);
}
finally
{
if (client != null)
client.Dispose();
}
return returnResult;
}
}
我不能得到的數據，以我的視圖模型使用的API發佈。什麼我應該怎麼做