我正在尝试从不同的ViewModel和不同的模型填充2个列表视图。
我尝试在2个绑定上下文之间使用Itemsource。 （请参阅我的view.cs）
我尝试在我的视图中使用一个名称，然后在[xamarin论坛]中将源作为示例发送。1
我基本尝试在绑定中使用Source = {x：Reference Model.Protocol}
任何人工作
我的看法是： 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"
x:Class="H2XA.View.ConnectView"
x:Name="Root">
<!--I put a name where but i don't know if I can cuz i use Detail=new ConnectView every time -->
<ContentPage.Content >
<Grid >
<!-- Código principal-->
<ScrollView>
<StackLayout VerticalOptions="Start" >
<!--Exame -->
<Button x:Name="ConfigExam"
Text="Características de exame"
Clicked="ConfigExam_Clicked"
BackgroundColor="#FFFFFFFF"/>
<StackLayout x:Name="AllConfigExam" VerticalOptions="Fill" HorizontalOptions="CenterAndExpand" >
<Button x:Name = "NewProtocol"
Text="Criar novo protocolo"
Clicked="NewProtocol_Clicked"
HorizontalOptions="Center"/>
<BoxView />
<StackLayout x:Name="ProtoScreen" VerticalOptions="Start" >
<ListView x:Name="Protocol_Disponivel" ItemSelected="OnSelectionP" IsPullToRefreshEnabled="True" >
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<ViewCell.ContextActions>
<MenuItem Text="Editar" CommandParameter="{Binding .}"
Clicked="EditarProtocol_Clicked" />
<MenuItem Text="Remover" CommandParameter="{Binding .}"
Clicked="RemoverProtocol_Clicked" />
</ViewCell.ContextActions>
<StackLayout Padding="5,0,5,0">
<Label Text="Intervalos de tempo:" />
<StackLayout Orientation="Horizontal">
<Label Text="0 | "/>
<Label Text="{Binding Model.Patient.intervaldescription,Source={x:Reference Root}}" Font="14" />
</StackLayout>
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackLayout>
</StackLayout>
<!--Conexão -->
<Button x:Name="ConfigConn"
Text="Aparelhos"
Clicked="ConfigConn_Clicked"
BackgroundColor="#FFFFFFFF"/>
<StackLayout x:Name="AllConfigConn" VerticalOptions="Fill" HorizontalOptions="CenterAndExpand" >
<StackLayout Orientation="Horizontal" HorizontalOptions="Center" >
<StackLayout Padding="10,10,10,10" VerticalOptions="Start">
<Button x:Name="connection"
Text="Procurar bluetooth"
Clicked="connection_Clicked"
HorizontalOptions="Center"/>
<Label x:Name="Status_recebimento_N"
Text="Status"
HorizontalOptions="Center"/>
<Label x:Name="Status_recebimento"
Text="{Binding Connectionwaymsg,Mode=Default}"
HorizontalOptions="Center"/>
</StackLayout>
</StackLayout>
<StackLayout x:Name="ConnScreen" VerticalOptions="Start">
<Label x:Name="MAC_title"
Text="MAC do aparelho"
VerticalOptions="Center"
HorizontalOptions="Center"/>
<ListView x:Name="MACS_Disponiveis" ItemSelected="OnSelectionD" IsPullToRefreshEnabled="True" >
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<ViewCell.ContextActions>
<MenuItem Text="Renomear" CommandParameter="{Binding .}"
Clicked="ReplaceMAC_Clicked" />
<MenuItem Text="Remover" CommandParameter="{Binding .}"
Clicked="RemoveMAC_Clicked" />
</ViewCell.ContextActions>
<StackLayout Padding="5,0,5,0">
<Label Text="MAC:" />
<Label Text="{Binding .}" Font="14" />
</StackLayout>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
</StackLayout>
</StackLayout>
</StackLayout>
</ScrollView>
<!-- Voltar-->
<StackLayout HorizontalOptions ="End" VerticalOptions ="End" Padding="30">
<Button x:Name="Backcon" Style="{StaticResource BackButton}"
Text="Voltar" Clicked="Backcon_Clicked" />
</StackLayout>
</Grid>
</ContentPage.Content>
</ContentPage>
.CS
[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class ConnectView : ContentPage
{
public IConnections Conectado;
public ConnectView ()
{
InitializeComponent ();
Conectado = DependencyService.Get<IConnections>();
BindingContext = App.CVM;
MACS_Disponiveis.ItemsSource = App.CVM.BLE_Devices;
//I tried where uses 2 times but didn't work too
//BindingContext = App.SVM;
Protocol_Disponivel.ItemsSource = App.SVM.Saved_Protocols;
if (App.SVM.Saved_Protocols.Count > 0)
ProtoScreen.IsVisible = true;
Status_recebimento.MaxLines=1;
}
#region Protocol
private void NewProtocol_Clicked(object sender, EventArgs e)
{
App.MDP.Detail = new SetupView();
}
#endregion
#region Aparelhos e MACs
private async void OnSelectionD(object sender, SelectedItemChangedEventArgs e)
{
if (e.SelectedItem == null)
{
return;
}
await DisplayAlert("Selecionado", e.SelectedItem.ToString(), "Ok");
string a = e.SelectedItem.ToString().Substring(0, 12);
}
private void RenomearMAC_Clicked(object sender, EventArgs e)
{
var item = (MenuItem)sender;
App.CVM.BLE_Devices.Remove(item.CommandParameter.ToString());
}
private void RemoverMAC_Clicked(object sender, EventArgs e)
{
var item = (MenuItem)sender;
App.CVM.BLE_Devices.Remove(item.CommandParameter.ToString());
}
#endregion
private void Backcon_Clicked(object sender, EventArgs e)
{
App.MDP.Detail = new StarterView();
}
}
}
我的视图模型是：
public class ConnectViewModel : INotifyPropertyChanged
{
#region Variables
public NewStatusCMD newStatusCMD { get; }
public IConnections All_conn;
public Connection Bl_Conn;
private string conectionwaymsg;
public string bluetoothstatus;
public string mldplink;
public string MLDPINBUFF;
//BLE_Devices is my List there
public ObservableCollection<string> BLE_Devices;
public event PropertyChangedEventHandler PropertyChanged;
#endregion
public ConnectViewModel()
{
Bl_Conn = new Connection();
BLE_Devices = new ObservableCollection<string>();
}
public string Connectionwaymsg
{
get { return conectionwaymsg; }
set
{
conectionwaymsg = value;
OnPropertyChanged(); // Realize the event after the new value is informed for adapted.
}
}
public string Mldplink
{
get { return mldplink; }
set
{
mldplink = value;
OnPropertyChanged(); // Realize the event after the new value is informed for adapted.
}
}
//Padrão Default
private void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
if (Mldplink != null)
{
MLDPINBUFF = MLDPINBUFF + mldplink;
mldplink = null;
}
}
private void FillListView()
{
var a = All_conn.getMAC();
for ( int i=0; i < a.Count; i++) BLE_Devices.Add(a[i]);
}
private void Activation_Clicked(object sender, EventArgs e)
{
All_conn.ConnectBluetooth();
}
private void connection_Clicked(object sender, EventArgs e)
{
All_conn.ConnectBluetooth();
}
}
}
和
public class SetupViewModel : INotifyPropertyChanged
{
public Protocol Protocol_Model;
public List<Protocol> Saved_Protocols;
public int[] modelinterval;
public SetupViewModel()
{
modelinterval = new int[16] { 0, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10 };
Protocol_Model = new Protocol(modelinterval);
Saved_Protocols = new List<Protocol>();
}
public event PropertyChangedEventHandler PropertyChanged;
}
}
我的模特是：
public class Connection: INotifyPropertyChanged
{
public Guid Id { get; set; }
public string Name { get; set; }
public string MAC { get; set; }
private string bluetoothStatus;//private pra não confundir o uso ...
public string BluetoothStatus
{
get { return bluetoothStatus; }
set
{
bluetoothStatus = value;
App.CVM.newStatusCMD.StatusCanExecuteChanged();
}
}
private bool _connvisible;
public bool ConnVisible
{
get { return _connvisible; }
set
{
_connvisible = value;
OnPropertyChanged();
}
}
public Connection()
{
List<char> Testee;
}
public event PropertyChangedEventHandler PropertyChanged;
private void OnPropertyChanged([CallerMemberName] String propertyName = "")
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
}
和
public class Protocol
{
public string Name;
//This is the variable that i tried to use
public string intervaldescription;
public int total_Time;
public string interval_Time;
public int[] example;
public int[] intervalBS;
public Protocol( int[] interval)
{
intervalBS = interval;
intervaldescription = Interval_line(interval);
}
private string Interval_line(int[] interval)
{
int i;
string inter_string="";
return inter_string;
}
}
我没有使用像cross或lite这样的通用MVVM，因为我的老板使用了一个类似的地雷。
任何帮助
预先感谢
吉尔赫姆
答案 0 :(得分：0)
问题很简单，要使用notify属性或绑定，您需要将变量设置为属性。 为此，您需要在模型中添加{get; set;}方法，因为绑定是通过链接器/执行器来完成的。
在那种情况下，最严重的问题是在协议类中，因为字符串inervaldescription没有属性方法{设置；}
public class Protocol
{
public string Name;
//This is the variable that i tried to use -> IT'S NOT A VARIABLE
public string intervaldescription{ get; set;}
public int total_Time;
public string interval_Time;
public int[] example;
public int[] intervalBS;
public Protocol( int[] interval)
{
intervalBS = interval;
intervaldescription = Interval_line(interval);
}
private string Interval_line(int[] interval)
{
int i;
string inter_string="";
return inter_string;
}
}
正如杰森（Jason）所说的那样，这段代码有点混乱，因此我需要删除stacklayouts并将几乎所有代码都设置为gridlayout.I不知道一种删除scrowview的方法，但其他结构也可以工作。
这里需要提供的其他信息是Jason给我的关于绑定上下文与Itemsource的信息。
当我使用物品来源时，我不需要对该结构使用绑定上下文。所以我可以使用列表/集合，只是注意到谁是我的来源。
public partial class ConnectView : ContentPage
{
public IConnections Conectado;
public ConnectView ()
{
InitializeComponent ();
Conectado = DependencyService.Get<IConnections>();
BindingContext = App.CVM;
MACS_Disponiveis.ItemsSource = App.CVM.BLE_Devices;
Protocol_Disponivel.ItemsSource = App.SVM.Saved_Protocols;
if (App.SVM.Saved_Protocols.Count > 0)
ProtoScreen.IsVisible = true;
Status_recebimento.MaxLines=1;
}
//.
//.
//.
}
谢谢杰森（Jason）给出的解释：）
致谢
吉尔赫姆