MediaElement.MediaFailed 事件
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
public:
virtual event ExceptionRoutedEventHandler ^ MediaFailed;// Register
event_token MediaFailed(ExceptionRoutedEventHandler const& handler) const;
// Revoke with event_token
void MediaFailed(event_token const* cookie) const;
// Revoke with event_revoker
MediaElement::MediaFailed_revoker MediaFailed(auto_revoke_t, ExceptionRoutedEventHandler const& handler) const;public event ExceptionRoutedEventHandler MediaFailed;function onMediaFailed(eventArgs) { /* Your code */ }
mediaElement.addEventListener("mediafailed", onMediaFailed);
mediaElement.removeEventListener("mediafailed", onMediaFailed);
- or -
mediaElement.onmediafailed = onMediaFailed;Public Custom Event MediaFailed As ExceptionRoutedEventHandler <MediaElement MediaFailed="eventhandler" .../>
事件类型
示例
以下代码创建一个 MediaFailed 事件处理程序，该事件处理程序调用帮助程序函数以从事件参数检索 HRESULT 。
private void videoMediaElement_MediaFailed(object sender, ExceptionRoutedEventArgs e)
{
// get HRESULT from event args
string hr = GetHresultFromErrorMessage(e);
// Handle media failed event appropriately
}
private string GetHresultFromErrorMessage(ExceptionRoutedEventArgs e)
{
String hr = String.Empty;
String token = "HRESULT - ";
const int hrLength = 10; // eg "0xFFFFFFFF"
int tokenPos = e.ErrorMessage.IndexOf(token, StringComparison.Ordinal);
if (tokenPos != -1)
{
hr = e.ErrorMessage.Substring(tokenPos + token.Length, hrLength);
}
return hr;
}
注解
最佳做法是始终处理 MediaFailed 事件并采取适当的操作。