IsolatedStorageFileStream::BeginRead Method
Silverlight
Begins an asynchronous read.
Namespace: System.IO.IsolatedStorage
Assembly: mscorlib (in mscorlib.dll)
Parameters
- buffer
- Type: array<System::Byte>
The buffer to read data into.
- offset
- Type: System::Int32
The byte offset in buffer at which to begin reading.
- numBytes
- Type: System::Int32
The maximum number of bytes to read.
- userCallback
- Type: System::AsyncCallback
The method to call when the asynchronous read operation is completed. This parameter is optional.
- stateObject
- Type: System::Object
The status of the asynchronous read.
Return Value
Type: System::IAsyncResultAn IAsyncResult object that represents the asynchronous read, which is possibly still pending. This IAsyncResult must be passed to this stream's EndRead method to determine how many bytes were read. This can be done either by the same code that called BeginRead or in a callback passed to BeginRead.
| Exception | Condition |
|---|---|
| IsolatedStorageException | The isolated store has been removed. -or- Isolated storage is disabled. |
| ArgumentException | The buffer length minus offset is less than numBytes. |
| ArgumentNullException | buffer is nullptr. |
| ArgumentOutOfRangeException | offset or numBytes is negative. |
| IOException | An asynchronous read was attempted past the end of the file. |
| ObjectDisposedException | The stream has been disposed. |
The current position in the stream is updated when you issue the asynchronous read or write, not when the I/O operation completes.
You must call EndRead with this IAsyncResult to find out how many bytes were read.
Version Notes
Silverlight for Windows Phone
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.
Community Additions
ADD
Show: