我有一個圖像控件，它的源綁定到一個對象上的屬性（字符串url到圖像）。進行服務調用後，我使用新的URL更新數據對象。它在調用PropertyChanged事件後離開我的代碼後拋出異常。Silverlight DataBinding跨線程問題
數據結構和服務邏輯都是在不知道UI的核心dll中完成的。當我無法訪問分派器時，如何與UI線程同步？ PS：訪問Application.Current.RootVisual以獲得Dispatcher不是一個解決方案，因爲根目錄位於不同的線程上（導致我需要防止的確切異常）。
PPS：這只是一個圖像控制的問題，綁定到任何其他UI元素，交叉線程問題是爲您處理的。
您是否嘗試過實施INotifyPropertyChanged？
Application類上RootVisual的屬性獲取方有一個導致該異常的線程檢查。我周圍這讓在我自己的財產存放根視覺的調度員在我App.xaml.cs：
public static Dispatcher RootVisualDispatcher { get; set; }
private void Application_Startup(object sender, StartupEventArgs e)
{
this.RootVisual = new Page();
RootVisualDispatcher = RootVisual.Dispatcher;
}
如果再調用BeginInvoke上App.RootVisualDispatcher而非Application.Current.RootVisual.Dispatcher你不該」噸得到這個例外。
我遇到類似的問題，這一點，但是這是在Windows窗體：
我已經有它自己的線程，更新關於另一個進程統計類，那裏是我的UI控件是數據綁定到這個對象。我也陷入了跨線程調用的問題，這是我如何解決它：
Form m_MainWindow; //Reference to the main window of my application
protected virtual void OnPropertyChanged(string propertyName)
{
if(PropertyChanged != null)
if(m_MainWindow.InvokeRequired)
m_MainWindow.Invoke(
PropertyChanged, this, new PropertyChangedEventArgs(propertyName);
else
PropertyChanged(this, new PropertyChangedEventArgs(propertyName);
}
這似乎工作的偉大，如果任何人有意見，請讓我知道。
System.Windows.Deployment.Current.Dispatcher.BeginInvoke(() => {...});
也期待here.
當過我們要更新UI相關的項目採取行動，應在UI線程發生否則你會得到一個無效的橫紗訪問異常
Deployment.Current.Dispatcher.BeginInvoke(() =>
{
UpdateUI(); // DO the actions in the function Update UI
});
public void UpdateUI()
{
//to do :Update UI elements here
}
的INotifyPropertyChanged接口用於通知客戶端（通常是綁定客戶端）屬性值已更改。
例如，考慮具有名爲FirstName的屬性的Person對象。爲了提供通用屬性更改通知，Person類型實現INotifyPropertyChanged接口，並在更改FirstName時引發PropertyChanged事件。
對於在綁定的客戶端和一個數據源之間的結合發生變化通知，您的bound類型要麼：
貫徹INotifyPropertyChanged接口（優選的）。
爲綁定類型的每個屬性提供更改事件。
不要這樣做。
實施例：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Runtime.CompilerServices;
using System.Windows.Forms;
// Change the namespace to the project name.
namespace TestNotifyPropertyChangedCS
{
// This form demonstrates using a BindingSource to bind
// a list to a DataGridView control. The list does not
// raise change notifications. However the DemoCustomer type
// in the list does.
public partial class Form1 : Form
{
// This button causes the value of a list element to be changed.
private Button changeItemBtn = new Button();
// This DataGridView control displays the contents of the list.
private DataGridView customersDataGridView = new DataGridView();
// This BindingSource binds the list to the DataGridView control.
private BindingSource customersBindingSource = new BindingSource();
public Form1()
{
InitializeComponent();
// Set up the "Change Item" button.
this.changeItemBtn.Text = "Change Item";
this.changeItemBtn.Dock = DockStyle.Bottom;
this.changeItemBtn.Click +=
new EventHandler(changeItemBtn_Click);
this.Controls.Add(this.changeItemBtn);
// Set up the DataGridView.
customersDataGridView.Dock = DockStyle.Top;
this.Controls.Add(customersDataGridView);
this.Size = new Size(400, 200);
}
private void Form1_Load(object sender, EventArgs e)
{
// Create and populate the list of DemoCustomer objects
// which will supply data to the DataGridView.
BindingList<DemoCustomer> customerList = new BindingList<DemoCustomer>();
customerList.Add(DemoCustomer.CreateNewCustomer());
customerList.Add(DemoCustomer.CreateNewCustomer());
customerList.Add(DemoCustomer.CreateNewCustomer());
// Bind the list to the BindingSource.
this.customersBindingSource.DataSource = customerList;
// Attach the BindingSource to the DataGridView.
this.customersDataGridView.DataSource =
this.customersBindingSource;
}
// Change the value of the CompanyName property for the first
// item in the list when the "Change Item" button is clicked.
void changeItemBtn_Click(object sender, EventArgs e)
{
// Get a reference to the list from the BindingSource.
BindingList<DemoCustomer> customerList =
this.customersBindingSource.DataSource as BindingList<DemoCustomer>;
// Change the value of the CompanyName property for the
// first item in the list.
customerList[0].CustomerName = "Tailspin Toys";
customerList[0].PhoneNumber = "(708)555-0150";
}
}
// This is a simple customer class that
// implements the IPropertyChange interface.
public class DemoCustomer : INotifyPropertyChanged
{
// These fields hold the values for the public properties.
private Guid idValue = Guid.NewGuid();
private string customerNameValue = String.Empty;
private string phoneNumberValue = String.Empty;
public event PropertyChangedEventHandler PropertyChanged;
// This method is called by the Set accessor of each property.
// The CallerMemberName attribute that is applied to the optional propertyName
// parameter causes the property name of the caller to be substituted as an argument.
private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
// The constructor is private to enforce the factory pattern.
private DemoCustomer()
{
customerNameValue = "Customer";
phoneNumberValue = "(312)555-0100";
}
// This is the public factory method.
public static DemoCustomer CreateNewCustomer()
{
return new DemoCustomer();
}
// This property represents an ID, suitable
// for use as a primary key in a database.
public Guid ID
{
get
{
return this.idValue;
}
}
public string CustomerName
{
get
{
return this.customerNameValue;
}
set
{
if (value != this.customerNameValue)
{
this.customerNameValue = value;
NotifyPropertyChanged();
}
}
}
public string PhoneNumber
{
get
{
return this.phoneNumberValue;
}
set
{
if (value != this.phoneNumberValue)
{
this.phoneNumberValue = value;
NotifyPropertyChanged();
}
}
}
}
}