C# 更新viewmodel时网格未更新
我有一个包含服务器列表的网格,当窗口打开时,我请求一个服务器列表,然后更新viewmodel。但这些更改不会显示在我的viewmodel中C# 更新viewmodel时网格未更新,c#,wpf,mvvm,C#,Wpf,Mvvm,我有一个包含服务器列表的网格,当窗口打开时,我请求一个服务器列表,然后更新viewmodel。但这些更改不会显示在我的viewmodel中 public ServerInfo_ViewModel serverInfoViewModel { get; set; } public FindServer2() { InitializeComponent(); this.Loaded += new RoutedEventHandler(WindowLoaded); server
public ServerInfo_ViewModel serverInfoViewModel { get; set; }
public FindServer2()
{
InitializeComponent();
this.Loaded += new RoutedEventHandler(WindowLoaded);
serverInfoViewModel = new ServerInfo_ViewModel();
}
void WindowLoaded(object sender, RoutedEventArgs e)
{
Multicast.OnAlarmServerFound += new Multicast.AlarmServerFoundHandler(Multicast_OnAlarmServerFound);
Multicast.FindAlarmServers();
}
public delegate void Multicast_OnAlarmServerFoundHandler(string IPAddress, string returnvalue);
void Multicast_OnAlarmServerFound(string IPAddress, string returnvalue)
{
ServerInfo si = new ServerInfo();
si.Server = IPAddress;
if (source.Length > 1)
si.Version = source[1];
if (source.Length > 2)
si.Connection = source[2];
if (source.Length > 3)
si.Port = source[3];
if (source.Length > 4)
si.HostName = source[4];
if (source.Length > 1)
{
try
{
serverInfoViewModel.Servers.Add(si); // This is called
}
catch
{}
}
}
这是我的viewmodel
public class ServerInfo_ViewModel : INotifyPropertyChanged
{
public ServerInfo_ViewModel()
{
this.Servers = new ObservableCollection<ServerInfo>();
LoadInitialServerList();
}
public ObservableCollection<ServerInfo> Servers
{
get
{
return servers;
}
set
{
servers = value;
servers.CollectionChanged += new System.Collections.Specialized.NotifyCollectionChangedEventHandler(servers_CollectionChanged);
}
}
void servers_CollectionChanged(object sender, System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
{
// Here you will be informed, if the content of the collection has been changed.
OnPropertyChanged("Servers");
}
private ObservableCollection<ServerInfo> servers;
private void LoadInitialServerList()
{
servers.Add(new ServerInfo("Test", "Test", "Test", "Test", "Test"));
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
public void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
}
}
公共类ServerInfo\u视图模型:INotifyPropertyChanged
{
公共服务器信息_视图模型()
{
this.Servers=newobserveCollection();
LoadInitialServerList();
}
公共可观测收集服务器
{
得到
{
返回服务器;
}
设置
{
服务器=价值;
servers.CollectionChanged+=新系统.Collections.Specialized.NotifyCollectionChangedEventHandler(servers\u CollectionChanged);
}
}
无效服务器\u CollectionChanged(对象发送方,System.Collections.Specialized.NotifyCollectionChangedEventArgs e)
{
//如果集合的内容已更改,将在此处通知您。
OnPropertyChanged(“服务器”);
}
专用可观测收集服务器;
私有void LoadInitialServerList()
{
添加(新的ServerInfo(“测试”、“测试”、“测试”、“测试”、“测试”));
}
#区域INotifyProperty更改成员
公共事件属性更改事件处理程序属性更改;
公共void OnPropertyChanged(字符串propertyName)
{
if(PropertyChanged!=null)
{
PropertyChanged(这是新的PropertyChangedEventArgs(propertyName));
}
}
#端区
}
}
和Xaml
<Window x:Class="Digicom.DESDigitelClientWPF.FindServer2"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525"
xmlns:local="clr-namespace:Digicom.DESDigitelClientWPF"
>
<Window.DataContext>
<local:ServerInfo_ViewModel/>
</Window.DataContext>
<StackPanel>
<DataGrid ItemsSource="{Binding Servers, Mode=TwoWay}" Height="132" Width="442" AutoGenerateColumns="False" GridLinesVisibility="None">
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding HostName}" Header="Server"/>
<DataGridTextColumn Binding="{Binding Server}" Header="IP" />
<DataGridTextColumn Binding="{Binding Version}" Header="Version" />
<DataGridTextColumn Binding="{Binding Connection}" Header="Connection" />
<DataGridTextColumn Binding="{Binding Port}" Header="Port" />
</DataGrid.Columns>
</DataGrid>
</StackPanel>
当我运行它时,我得到了这个结果,初始对象被显示,但不是在运行时添加的第二个对象
从XAML文件中删除Datacontext定义,并将其添加到Codebehind中。 您的代码创建了ViewModel的两个实例。您已将ServerInfo添加到未绑定到视图的实例中,因此无法看到更改 视图模型
public class ServerInfo_ViewModel : INotifyPropertyChanged
{
public ServerInfo_ViewModel()
{
this.Servers = new ObservableCollection<ServerInfo>();
LoadInitialServerList();
}
public ObservableCollection<ServerInfo> Servers
{
get
{
return servers;
}
set
{
if(servers != value)
{
servers = value;
OnPropertyChanged("Servers");
}
}
}
private ObservableCollection<ServerInfo> servers;
private void LoadInitialServerList()
{
servers.Add(new ServerInfo("Test", "Test", "Test", "Test", "Test"));
}
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
public void OnPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
}
是的,就是这样。谢谢
<Window x:Class="Digicom.DESDigitelClientWPF.FindServer2"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="350" Width="525"
xmlns:local="clr-namespace:Digicom.DESDigitelClientWPF"
>
<StackPanel>
<DataGrid ItemsSource="{Binding Servers, Mode=TwoWay}" Height="132" Width="442" AutoGenerateColumns="False" GridLinesVisibility="None">
<DataGrid.Columns>
<DataGridTextColumn Binding="{Binding HostName}" Header="Server"/>
<DataGridTextColumn Binding="{Binding Server}" Header="IP" />
<DataGridTextColumn Binding="{Binding Version}" Header="Version" />
<DataGridTextColumn Binding="{Binding Connection}" Header="Connection" />
<DataGridTextColumn Binding="{Binding Port}" Header="Port" />
</DataGrid.Columns>
</DataGrid>
</StackPanel>
public ServerInfo_ViewModel serverInfoViewModel { get; set; }
public FindServer2()
{
InitializeComponent();
this.Loaded += new RoutedEventHandler(WindowLoaded);
serverInfoViewModel = new ServerInfo_ViewModel();
this.DataContext = serverInfoViewModel;
}
void WindowLoaded(object sender, RoutedEventArgs e)
{
Multicast.OnAlarmServerFound += new Multicast.AlarmServerFoundHandler(Multicast_OnAlarmServerFound);
Multicast.FindAlarmServers();
}
public delegate void Multicast_OnAlarmServerFoundHandler(string IPAddress, string returnvalue);
void Multicast_OnAlarmServerFound(string IPAddress, string returnvalue)
{
ServerInfo si = new ServerInfo();
si.Server = IPAddress;
if (source.Length > 1)
si.Version = source[1];
if (source.Length > 2)
si.Connection = source[2];
if (source.Length > 3)
si.Port = source[3];
if (source.Length > 4)
si.HostName = source[4];
if (source.Length > 1)
{
try
{
serverInfoViewModel.Servers.Add(si); // This is called
}
catch
{}
}
}