一个解决在非UI线程中访问UI 异常的小方法

/// <summary>
/// Lyx 线程框架 类
/// </summary>
public class LyxThreadFrame
{
    /// <summary>
    /// 主线程 签名
    /// </summary>
    public const string MainThreadIdiograph = "Main Thread";

    /// <summary>
    /// 初始化 线程检测框架
    /// <para>请在UI(主)线程下初始化</para>
    /// </summary>
    public static void Init()
    {
        var thread = System.Threading.Thread.CurrentThread;
        thread.Name = MainThreadIdiograph;
    }
}

public partial class App : Application
{
    protected override void OnStartup(StartupEventArgs e)
    {
        LyxThreadFrame.Init();
        base.OnStartup(e);
    }
}

/// <summary>
/// 线程 扩展类
/// </summary>
public static class ThreadExtension
{
    /// <summary>
    /// 当前线程是否是主线程
    /// </summary>
    public static bool IsMainThread(this Thread thread)
    {
        if (thread == null)
        {
            throw new ArgumentNullException("thread");
        }
        if (thread.Name == null)
        {
            return false;
        }
        return thread.Name.Equals(LyxThreadFrame.MainThreadIdiograph);
    }
}

/// <summary>
/// 委托 扩展类
/// </summary>
public static class DelegateExtension
{
    /// <summary>
    /// 在UI(主)线程中执行
    /// </summary>
    public static object SafetyInvoke(this Delegate dele, params object[] param)
    {
        var thread = System.Threading.Thread.CurrentThread;
        if (thread.IsMainThread())
        {
            return dele.DynamicInvoke(param);
        }
        else
        {
            return Application.Current.Dispatcher.Invoke(dele, param);
        }
    }
}

public void Hello()
{
    var action = new Action(() => 
    {
        //更新UI
    });
　　action.SafetyInvoke();
}