Piszę aktualnie projekt za pomocą wzorca MVVM i napotkałem pewien błąd:
"Nie znaleziono elementu DataContext dla powiązania (i jakiś Binding)". Nie jestem pewien czemu nie działają te bindingi ponieważ pierwszy raz piszę za pomocą tego wzorca. Oto mój kod:
Strona rejestracji Xaml oraz Cs:
<Page x:Class="WorkApp.MVVM.Pages.RegisterPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:WorkApp.MVVM.Pages"
mc:Ignorable="d"
d:DesignHeight="600" d:DesignWidth="900"
Title="RegisterPage">
<Border CornerRadius="20"
Background="#366bd6">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="200"/>
<ColumnDefinition/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="75"/>
<RowDefinition />
</Grid.RowDefinitions>
<Label Content="Work"
HorizontalContentAlignment="Center"
VerticalContentAlignment="Center"
FontSize="30"
Background="#325ea8"
/>
<Label Content="Register"
HorizontalContentAlignment="Center"
VerticalContentAlignment="Center"
FontSize="30"
Grid.Column="1"
Background="#325ea8"
/>
<StackPanel Grid.Row="1"
Grid.Column="0"
Margin="10"
Grid.ColumnSpan="2"
>
<StackPanel>
<Label HorizontalAlignment="Center" Content="Name" Foreground="White" FontSize="20"/>
<TextBox Style="{StaticResource LoginRegisterTextBoxTheme}" Margin="0,0,0,10" Text="{Binding Name}"/>
</StackPanel>
<StackPanel>
<Label HorizontalAlignment="Center" Content="Surname" Foreground="White" FontSize="20"/>
<TextBox Style="{StaticResource LoginRegisterTextBoxTheme}" Margin="0,0,0,10" Text="{Binding Surname}"/>
</StackPanel>
<StackPanel>
<Label HorizontalAlignment="Center" Content="Email" Foreground="White" FontSize="20"/>
<TextBox Style="{StaticResource LoginRegisterTextBoxTheme}" Margin="0,0,0,10" Text="{Binding Email}"/>
</StackPanel>
<StackPanel>
<Label HorizontalAlignment="Center" Content="Password" Foreground="White" FontSize="20"/>
<TextBox Style="{StaticResource LoginRegisterTextBoxTheme}" Text="{Binding PasswordHash}"/>
</StackPanel>
<StackPanel>
<Label HorizontalAlignment="Center" Content="Repeat password" Foreground="White" FontSize="20"/>
<TextBox Style="{StaticResource LoginRegisterTextBoxTheme}" Margin="0,0,0,10"/>
</StackPanel>
<StackPanel>
<Button Style="{StaticResource LoginLogoutButtonTheme}" Content="Register" FontSize="20" Width="200" Background="#325ea8" Click="LoginAndBackToMainPage" Command="{Binding AddNewUserCommand}"/>
<Button Style="{StaticResource LoginLogoutButtonTheme}" Content="Do you have account? Login now!" FontSize="20" Width="200" Background="#325ea8" Click="GoToLoginrPage"/>
<Button Style="{StaticResource LoginLogoutButtonTheme}" Content="Back to Main Page" FontSize="20" Width="200" Background="#325ea8" Click="BackGoMainPage"/>
</StackPanel>
</StackPanel>
</Grid>
</Border>
</Page>
using WorkApp.MVVM.ViewModel;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace WorkApp.MVVM.Pages
{
/// <summary>
/// Logika interakcji dla klasy RegisterPage.xaml
/// </summary>
public partial class RegisterPage : Page
{
public RegisterPage()
{
InitializeComponent();
AddNewUser newUser = new();
DataContext = newUser;
}
private void LoginAndBackToMainPage(object sender, RoutedEventArgs e)
{
}
private void GoToRegisterPage(object sender, RoutedEventArgs e)
{
}
private void BackGoMainPage(object sender, RoutedEventArgs e)
{
if (App.Current.MainWindow is MainWindow mainWindow)
{
mainWindow.ChangePage(new MainPage());
}
}
private void GoToLoginrPage(object sender, RoutedEventArgs e)
{
if (App.Current.MainWindow is MainWindow mainWindow)
{
mainWindow.ChangePage(new LoginPage());
}
}
}
}
Folder "Model" klasa "UserManager":
using Microsoft.Data.Sqlite;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace WorkApp.MVVM.Model
{
public class UserManager
{
public static void InsertUserData(Users user)
{
string dbPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "work.db");
using (var db = new SqliteConnection($"Filename={dbPath}"))
{
db.Open();
var insertCommand = new SqliteCommand();
insertCommand.Connection = db;
insertCommand.CommandText = "INSERT INTO users VALUES(NULL, @Name, @Surname, NULL ,@Email, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, @Password, NULL, 0);";
insertCommand.Parameters.AddWithValue("@Name", user.Name);
insertCommand.Parameters.AddWithValue("@Surname", user.Surname);
insertCommand.Parameters.AddWithValue("@Email", user.Email);
insertCommand.Parameters.AddWithValue("@Password", user.PasswordHash);
insertCommand.ExecuteReader();
}
}
}
}
Folder "ViewModel" klasa "AddNewUser":
using WorkApp.MVVM.Commands;
using WorkApp.MVVM.Model;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;
namespace WorkApp.MVVM.ViewModel
{
public class AddNewUser
{
public ICommand AddNewUserCommand { get; set; }
public string _Name { get; set; }
public string _Surname { get; set; }
public string _Email { get; set; }
public string _PasswordHash { get; set; }
public AddNewUser()
{
AddNewUserCommand = new RelayCommand(AddUser, CanAddUser);
}
private bool CanAddUser(object obj)
{
return true;
}
private void AddUser(object obj)
{
Users users = new(){
Name = _Name,
Surname = _Surname,
Email = _Email,
PasswordHash = _PasswordHash
};
UserManager.InsertUserData(users);
}
}
}
Folder "Commands" klasa "RelayCommand":
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;
namespace WorkApp.MVVM.Commands
{
public class RelayCommand : ICommand
{
public event EventHandler? CanExecuteChanged;
private Action<object> _Excute { get; set; }
private Predicate<object> _CanExcute { get; set; }
public RelayCommand(Action<object> executeMethod, Predicate<object> CanExcuteMethod)
{
_Excute = executeMethod;
_CanExcute = CanExcuteMethod;
}
public bool CanExecute(object? parameter)
{
return _CanExcute(parameter);
}
public void Execute(object? parameter)
{
_Excute(parameter);
}
}
}
z góry dziękuję za pomoc 
.
