Question

我知道很多次都会问过这类问题。但我试图在不使用InotifyProperty或其他任何东西的情况下实现这一目标。我只想要用于显示模型数据的简单代码。为此，我尝试使用以下方法绑定Datagrid。我有一个模型：

public class PrimaryModel
{
    private int _id;

    public int ID
    {
        get { return _id; }
        set { _id = value; }
    }

    private string _userName;

    public string UserName
    {
        get { return _userName; }
        set { _userName = value; }
    }

    private string _password;

    public string Password
    {
        get { return _password; }
        set { _password = value; }
    }

    private DateTime _createdDateTime;

    public DateTime CreatedDateTime
    {
        get { return _createdDateTime; }
        set { _createdDateTime = value; }
    }

    private DateTime _lastLoginDateTime;

    public DateTime LastLoginDateTime
    {
        get { return _lastLoginDateTime; }
        set { _lastLoginDateTime = value; }
    }

    private bool _isActive;

    public bool IsActive
    {
        get { return _isActive; }
        set { _isActive = value; }
    }
}

ViewModel：

public class PrimaryViewModel 
{
    private ObservableCollection<PrimaryModel> _UsersList;

    public PrimaryViewModel()
    {
        _UsersList = new ObservableCollection<PrimaryModel>
        {
            new PrimaryModel { ID=1,UserName="Raghava",Password="Something",CreatedDateTime=DateTime.Now,LastLoginDateTime=DateTime.Now,IsActive=true }
        };
    }

    public ObservableCollection<PrimaryModel> Users
    {
        get { return _UsersList; }
        set { _UsersList = value; }
    }
}

和一个XAML文件：

<Window x:Class="Sample4.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:Sample4"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <DataGrid Name="usersData" ItemsSource="{Binding Source=_UsersList}" AutoGenerateColumns="False">
            <DataGrid.Columns>
                <DataGridTextColumn Binding="{Binding Path=ID}" />
                <DataGridTextColumn Binding="{Binding Path=UserName}" />
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</Window>

如何通过ViewModel绑定DataGrid以显示基本ID和用户名？

Answer 1

更改XAMl代码中的绑定，如ItemsSource="{Binding Source=Users}"。你不能绑定到私人领域;你必须使用公共财产。

您还需要设置视图的DataContext。你做到了吗？

但没有INotifyProperyChanged的MVVM和绑定是一个糟糕的选择。当ViewModel发生变化时，您的视图将不会更新。

Answer 2

  public class PrimaryViewModel
    {
        public ObservableCollection<PrimaryModel> Users //Allways private set - to not destroy the Binding! Use Clear instead of reintializing !!!
        {
            get;
            private set;
        }

        public PrimaryViewModel()
        {
            Users = new ObservableCollection<PrimaryModel>
            {
                new PrimaryModel { ID=1,UserName="Raghava",Password="Something",CreatedDateTime=DateTime.Now,LastLoginDateTime=DateTime.Now,IsActive=true }
            };
        }
    }

你主要设置ItemSource错误...

        <DataGrid Name="usersData" ItemsSource="{Binding Path=Users}" AutoGenerateColumns="False">
            <DataGrid.Columns>
                <DataGridTextColumn Binding="{Binding Path=ID}"/>
                <DataGridTextColumn Binding="{Binding Path=UserName}" />
            </DataGrid.Columns>
        </DataGrid>

因为您不想使用INotifiyPropertyChanged更新您的内容 - 将所有Setter设置为私有，因为您的DataGrid中的字段当前不会更新。

另外，为什么要在所有属性中包装所有字段而不用其他内容！？！

Answer 3

您应该将视图的[uwsgi] master = true socket = /tmp/uwsgi.sock chmod-socket = 666 chdir = /var/www/django/webserver_test wsgi-file = /var/www/django/webserver_test/Django_app/wsgi.py virtualenv = /var/www/django/virtual pythonpath = /var/www/django/virtual/bin/python vacuum = true enable-threads = true daemonize= /var/www/django/uwsgi.log设置为视图模型的实例。

您可以在视图的代码隐藏中执行此操作：

DataContext

...或在XAML标记中：

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        DataContext = new PrimaryViewModel();
    }
}

使用带有MVVm的WPF绑定DataGrid

3 个答案: