无法从非UI线程更新wpf控件

时间:2015-09-26 21:12:27

标签: c# wpf multithreading data-binding

我知道这已经得到了回答,但我无法让它发挥作用。有人可以帮我解决这个问题

这是我的xaml课程:

namespace Windamow
{
/// <summary>
/// Interaction logic for DynamoWindow.xaml
/// </summary>
public partial class DynamoWindow : Window
{
    public DynamoWindow()
    {
        InitializeComponent();
    }
    public void setBrowserURL(string URL)
    {
        browser.Source = new Uri(URL);
    }
    public void setBrowserFromString(string HTMLString)
    {
        browser.NavigateToString(HTMLString);
    }
}
}

然后我尝试更新显示的html字符串:

namespace Windamow
{
public class Windamow
{

    private DynamoWindow window;

    internal void ThreadProc()
    {
        window = new DynamoWindow();

        window.ShowDialog();
    }

    internal Windamow()
    {
        Thread t = new Thread(ThreadProc);
        t.SetApartmentState(ApartmentState.STA);
        t.Start();
    }

    public static DynamoWindow MakeWindow(bool launch, string html)
    {
        if (launch)
        {
            Windamow mow = new Windamow();

            var action = new Action(() => mow.window.setBrowserFromString(html));
            Application.Current.Dispatcher.BeginInvoke(
            DispatcherPriority.Input,
            action);

            return mow.window;
        }
        else
        {
            return null;
        }
    }
}
}

XAML:

<Window x:Class="Windamow.DynamoWindow"
         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" 
         mc:Ignorable="d" 
         d:DesignHeight="300" d:DesignWidth="300">
<Grid>
    <WebBrowser x:Name="browser" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/>
</Grid>

错误讯息:

调用线程无法访问此对象,因为其他线程拥有该对象。

1 个答案:

答案 0 :(得分:1)

问题在于:

var action = new Action(() => mow.window.setBrowserFromString(html));

此代码将尝试从主UI线程访问window对象,而它已在另一个线程上创建并与之关联,您自己创建的线程t

根据您的使用情况,您可以尝试以下方式:

public DynamoWindow(string html)
{
    InitializeComponent();

    setBrowserFromString(html);
}
...
if (launch)
{
    Windamow mow = new Windamow(html);

    return mow.window;
}

(未经测试但你明白了)