internal NavigationEventArgsAdapter( NavigationFailedEventArgs source )
{
Contract.Requires( source != null );
this.source = source;
IsSuccess = false;
}
// Code to execute if a navigation fails
private void RootFrame_NavigationFailed(object sender, NavigationFailedEventArgs e)
{
if (Debugger.IsAttached)
{
// A navigation has failed; break into the debugger
Debugger.Break();
}
}
HResult IExplorerBrowserEvents.OnNavigationFailed(IntPtr pidlFolder) {
if (NavigationFailed != null) {
NavigationFailedEventArgs args = new NavigationFailedEventArgs();
args.FailedLocation = ShellObjectFactory.Create(pidlFolder);
NavigationFailed(this, args);
}
return HResult.Ok;
}
/// <summary>
/// Clears the Explorer Browser of existing content, fills it with
/// content from the specified container, and adds a new point to the Travel Log.
/// </summary>
/// <param name="shellObject">The shell container to navigate to.</param>
/// <exception cref="System.Runtime.InteropServices.COMException">Will throw if navigation fails for any other reason.</exception>
public void Navigate(ShellObject shellObject) {
if (shellObject == null) {
throw new ArgumentNullException("shellObject");
}
if (explorerBrowserControl == null) {
antecreationNavigationTarget = shellObject;
} else {
HResult hr = explorerBrowserControl.BrowseToObject(shellObject.NativeShellItem, 0);
if (hr != HResult.Ok) {
if ((hr == HResult.ResourceInUse || hr == HResult.Canceled) && NavigationFailed != null) {
NavigationFailedEventArgs args = new NavigationFailedEventArgs();
args.FailedLocation = shellObject;
NavigationFailed(this, args);
} else {
throw new CommonControlException(LocalizedMessages.ExplorerBrowserBrowseToObjectFailed, hr);
}
}
}
}
/// <summary>
/// Clears the Explorer Browser of existing content, fills it with
/// content from the specified container, and adds a new point to the Travel Log.
/// </summary>
/// <param name="shellObject">The shell container to navigate to.</param>
/// <exception cref="System.Runtime.InteropServices.COMException">Will throw if navigation fails for any other reason.</exception>
public void Navigate(ShellObject shellObject)
{
if (explorerBrowserControl == null)
{
antecreationNavigationTarget = shellObject;
}
else
{
HRESULT hr = explorerBrowserControl.BrowseToObject(shellObject.NativeShellItem, 0);
if (hr != HRESULT.S_OK)
{
if (hr == HRESULT.RESOURCE_IN_USE)
{
if (NavigationFailed != null)
{
NavigationFailedEventArgs args = new NavigationFailedEventArgs();
args.FailedLocation = shellObject;
NavigationFailed(this, args);
}
}
else
throw new COMException("BrowseToObject failed", (int)hr);
}
}
}
void OnNavigationFailed(object sender, NavigationFailedEventArgs e)
{
throw new Exception("Failed to load Page " + e.SourcePageType.FullName);
}
private void OnNavigationFailed(NavigationFailedEventArgs e)
{
if (NavigationFailed != null){
NavigationFailed(this, e);
}
}
private void Navigate(Uri oldValue, Uri newValue, NavigationType navigationType)
{
Debug.WriteLine("Navigating from '{0}' to '{1}'", oldValue, newValue);
// set IsLoadingContent state
SetValue(IsLoadingContentPropertyKey, true);
// cancel previous load content task (if any)
// note: no need for thread synchronization, this code always executes on the UI thread
if (this.tokenSource != null) {
this.tokenSource.Cancel();
this.tokenSource = null;
}
// push previous source onto the history stack (only for new navigation types)
if (oldValue != null && navigationType == NavigationType.New) {
this.history.Push(oldValue);
}
object newContent = null;
if (newValue != null) {
// content is cached on uri without fragment
var newValueNoFragment = NavigationHelper.RemoveFragment(newValue);
if (navigationType == NavigationType.Refresh || !this.contentCache.TryGetValue(newValueNoFragment, out newContent)) {
var localTokenSource = new CancellationTokenSource();
this.tokenSource = localTokenSource;
// load the content (asynchronous!)
var scheduler = TaskScheduler.FromCurrentSynchronizationContext();
var task = this.ContentLoader.LoadContentAsync(newValue, this.tokenSource.Token);
task.ContinueWith(t => {
try {
if (t.IsCanceled || localTokenSource.IsCancellationRequested) {
Debug.WriteLine("Cancelled navigation to '{0}'", newValue);
}
else if (t.IsFaulted) {
// raise failed event
var failedArgs = new NavigationFailedEventArgs {
Frame = this,
Source = newValue,
Error = t.Exception.InnerException,
Handled = false
};
OnNavigationFailed(failedArgs);
// if not handled, show error as content
newContent = failedArgs.Handled ? null : failedArgs.Error;
SetContent(newValue, navigationType, newContent, true);
}
else {
newContent = t.Result;
if (ShouldKeepContentAlive(newContent)) {
// keep the new content in memory
this.contentCache[newValueNoFragment] = newContent;
}
SetContent(newValue, navigationType, newContent, false);
}
}
finally {
// clear global tokenSource to avoid a Cancel on a disposed object
if (this.tokenSource == localTokenSource) {
this.tokenSource = null;
}
// and dispose of the local tokensource
localTokenSource.Dispose();
}
}, scheduler);
return;
}
}
// newValue is null or newContent was found in the cache
SetContent(newValue, navigationType, newContent, false);
}
private void Frame_NavigationFailed(object sender, NavigationFailedEventArgs e)
{
NavigationFailed?.Invoke(sender, e);
}
/// <summary>
/// Invoked when Navigation to a certain page fails
/// </summary>
/// <param name="sender">The Frame which failed navigation</param>
/// <param name="e">Details about the navigation failure</param>
void OnNavigationFailed(object sender, NavigationFailedEventArgs e)
{
throw new Exception("Failed to load Page " + e.SourcePageType.FullName);
}
private void Frame_NavigationFailed(object sender, NavigationFailedEventArgs e)
{
throw e.Exception;
}
/// <summary>
/// 导航到特定页失败时调用
/// </summary>
///<param name="sender">导航失败的框架</param>
///<param name="e">有关导航失败的详细信息</param>
private void OnNavigationFailed(object sender, NavigationFailedEventArgs e)
{
Conf.Log($"unable to load page: {e.SourcePageType.FullName}.", LogLevel.Warning);
}
// Код для выполнения в случае ошибки навигации
private void RootFrame_NavigationFailed(object sender, NavigationFailedEventArgs e)
{
if (System.Diagnostics.Debugger.IsAttached)
{
// Ошибка навигации; перейти в отладчик
System.Diagnostics.Debugger.Break();
}
}
/// <summary>
/// Invoked when Navigation to a certain page fails
/// </summary>
/// <param name="sender">The Frame which failed navigation</param>
/// <param name="e">Details about the navigation failure</param>
private static void OnNavigationFailed(object sender, NavigationFailedEventArgs e) => throw new Exception($"Failed to load {e.SourcePageType.FullName}: {e.Exception}");
/// <summary>
/// Invoked when Navigation to a certain page fails
/// </summary>
/// <param name="sender">The Frame which failed navigation</param>
/// <param name="e">Details about the navigation failure</param>
void OnNavigationFailed(object sender, NavigationFailedEventArgs e)
{
throw new Exception($"Failed to load Page {e.SourcePageType}: {e.Exception}");
}
