public class CodecsLoadAsyncCompletedEventArgs : CodecsAsyncCompletedEventArgs
Public Class CodecsLoadAsyncCompletedEventArgs
public class CodecsLoadAsyncCompletedEvent extends CodecsAsyncCompletedEvent
public ref class CodecsLoadAsyncCompletedEventArgs : public CodecsAsyncCompletedEventArgs
NOTE: This topic is part of
RasterCodecs Async support using the .NET
System.ComponentMode.AsyncOperation model. For .NET
async/await support this type/member is not used. Instead, refer to RasterCodecs Async Operations.
The RasterCodecs class supports loading image files asynchronously using the RasterCodecs.LoadAsync methods. When calling any of these methods, the caller's thread will not be blocked and the method will return instantly with an instance of RasterImage that is in a loading status (theRasterImage.IsLoading property is set to true). Do not use the other properties of this object while the object is in loading status.
When the RasterCodecs object finishes loading the image, the various properties of the RasterImage will be populated with the image information and data and the RasterImage.IsLoading property will be set to false.
Do not poll the RasterImage.IsLoading property to determine whether the image is finished loaded. Instead, subscribe to the RasterCodecs.LoadAsyncCompleted event to get notification when the LoadAsync operation is completed and whether any errors occurred.
The RasterCodecs.LoadAsyncCompleted event uses a data argument object of type CodecsLoadAsyncCompletedEventArgs. This class contains the following properties:
|Uri, Stream and FileName||
Contains the URI, stream or file name passed to the method that initialized this asynchronous operation.
Only one of these properties can be a valid value (not a null reference) at any time The property that contains a valid reference depends on what version of RasterCodecs.LoadAsync method has been called.
For example, if RasterCodecs.LoadAsync(Uri uri, object userState) is being called, the Uri will contain the same URI passed to the method while Stream and FileName will both be null. If RasterCodecs.LoadAsync(String fileName, object userState) is being called, the FileName will contain the same file name string value passed to the method while Uri and Stream will both be null and so on.
Contains the RasterImage class instance that contains the image data being loaded. This instance is the same object returned from the RasterCodecs.LoadAsync method. While the asynchronous operation is running, the value of the RasterImage.IsLoading property will be true indicating that the object is being populated with the image information and should not be used. When the asynchronous operation completes, the RasterCodecs.LoadAsyncCompleted event will fire and Image will contain the final and ready to use object. If an error occurs, this property will be set to null and the object is disposed internally by the toolkit.
Contains any errors that might have occurred during the asynchronous operation. You must check this value when the RasterCodecs.LoadAsyncCompleted event fires and make sure it does not contain a valid Exception object.
For an example, refer to RasterCodecs.LoadAsyncCompleted.
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