我有两个使用相同表单的页面，因此我创建了表单的内容视图并应用如下可绑定属性：
<ContentView xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="ListContact.Extension.EditForm">
<StackLayout Padding="20">
<Label Text="Edit Contact Forms"
HorizontalOptions="Center"
FontSize="20"
TextColor="Blue"
VerticalOptions="Start"/>
<Label Text="Name"/>
<Entry x:Name="txtName" Text="{Binding NameText}" Placeholder="Name"/>
<Label Text="Phone number"/>
<Entry x:Name="txtPhoneNumber" Text="{Binding PhoneNumberText}" Placeholder="Phone number" Keyboard="Telephone"/>
<Label Text="Email"/>
<Entry x:Name="txtEmail" Text="{Binding EmailText}" Placeholder="Email" Keyboard="Email"/>
<Label Text="Description"/>
<Editor x:Name="txtDescription" Text="{Binding DescriptionText}" Placeholder="Description"
HeightRequest="70"/>
</StackLayout>
</ContentView>
这是后面的代码：
using ListContact.ViewModel;
using Xamarin.Forms;
using Xamarin.Forms.Xaml;
namespace ListContact.Extension
{
[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class EditForm : ContentView
{
private static readonly BindableProperty NameProperty = BindableProperty.Create("NameText", typeof(object), typeof(EditForm));
public string NameText { get => (string)GetValue(NameProperty); set => SetValue(NameProperty, value); }
private static readonly BindableProperty PhoneProperty = BindableProperty.Create("PhoneNumberText", typeof(string), typeof(EditForm));
public string PhoneNumberText { get => (string)GetValue(PhoneProperty); set => SetValue(PhoneProperty, value); }
private static readonly BindableProperty EmailProperty = BindableProperty.Create("EmailText", typeof(string), typeof(EditForm));
public string EmailText { get => (string)GetValue(EmailProperty); set => SetValue(EmailProperty, value); }
private static readonly BindableProperty DescriptionProperty = BindableProperty.Create("DescriptionText", typeof(string), typeof(EditForm));
public string DescriptionText { get => (string)GetValue(DescriptionProperty); set => SetValue(DescriptionProperty, value); }
public EditForm()
{
InitializeComponent();
BindingContext = this;
}
}
}
在视图中，我回调我之前创建的这个表单并将数据绑定到可绑定属性，如下所示：
这是 xaml 文件：
<ContentPage xmlns:local="clr-namespace:ListContact.Extension"
xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="ListContact.View.ListContactAddingForm">
<local:EditForm NameText="{Binding Name, Mode=TwoWay}" PhoneNumberText="egwebwev" EmailText="ưewevefqwf" DescriptionText="ewebe"/>
<ContentPage.Content>
<Button Text="Save"
HorizontalOptions="Center"
TextColor="White"
Command="{Binding AddContactCommand}"
BackgroundColor="#0A7CFF"/>
</ContentPage.Content>
</ContentPage>
这是背后的代码：
namespace ListContact.View
{
[XamlCompilation(XamlCompilationOptions.Compile)]
public partial class ListContactAddingForm : ContentPage
{
private SQLiteAsyncConnection connection;
public ListContactAddingForm()
{
connection = new SQLiteAsyncConnection(BaseConnection.DatabasePath);
ViewModel = new ContactViewModel(new PageService());
InitializeComponent();
}
private ContactViewModel ViewModel
{
get => BindingContext as ContactViewModel;
set => BindingContext = value;
}
}
}
`
这是我的视图模型：
namespace ListContact.ViewModel
{
public class ContactViewModel : BaseViewModel
{
public int Id { get; set; }
private string name;
public string Name
{
get => name;
set
{
SetValue(ref name, value);
}
}
private string description;
public string Description
{
get => description;
set
{
SetValue(ref description, value);
}
}
private string phoneNumber;
public string PhoneNumber
{
get => phoneNumber;
set
{
SetValue(ref phoneNumber, value);
}
}
private string email;
public string Email
{
get => email;
set
{
SetValue(ref email, value);
}
}
public ICommand AddContactCommand { get; private set; }
private IPageService pageService;
public object Alert { get; private set; }
public ContactViewModel(IPageService pageService)
{
this.pageService = pageService;
AddContactCommand = new Command(async () => await AddContacts());
}
private async Task AddContacts()
{
var newContact = new Contact()
{
Name = Name,
PhoneNumber = PhoneNumber,
Email = Email,
Description = Description
};
var result = await connection.InsertAsync(newContact);
if (result == 1)
await App.Current.MainPage.DisplayAlert("Successfully", "", "OK");
await pageService.PopAsycn();
}
}
}
但是当我运行这段代码时，我得到了错误：
未找到“NameText”的属性、可绑定属性或事件，或者值和属性之间的类型不匹配
在我将表单分成另一个内容视图并从视图中调用它并遇到此问题之前，我的代码还可以
所以我的问题是：我创建表单和可绑定属性的方式是否正确？我可以将数据绑定到表单中的可绑定属性吗？如果可以怎么办？以及如何解决上述错误？
我使用 MVVM 来构建这段代码
顺便说一句，对不起我的英语不好
