IsolatedStorageFileStream::BeginWrite Method (array<Byte>^, Int32, Int32, AsyncCallback^, Object^)
Begins an asynchronous write.
Assembly: mscorlib (in mscorlib.dll)
public: [HostProtectionAttribute(SecurityAction::LinkDemand, ExternalThreading = true)] virtual IAsyncResult^ BeginWrite( array<unsigned char>^ buffer, int offset, int numBytes, AsyncCallback^ userCallback, Object^ stateObject ) override
Parameters
- buffer
-
Type:
array<System::Byte>^
The buffer to write data to.
- offset
-
Type:
System::Int32
The byte offset in buffer at which to begin writing.
- numBytes
-
Type:
System::Int32
The maximum number of bytes to write.
- userCallback
-
Type:
System::AsyncCallback^
The method to call when the asynchronous write operation is completed. This parameter is optional.
- stateObject
-
Type:
System::Object^
The status of the asynchronous write.
Return Value
Type: System::IAsyncResult^An IAsyncResult that represents the asynchronous write, which is possibly still pending. This IAsyncResult must be passed to this stream's EndWrite method to ensure that the write is complete, then frees resources appropriately. This can be done either by the same code that called BeginWrite or in a callback passed to BeginWrite.
| Exception | Condition |
|---|---|
| IOException | An asynchronous write was attempted past the end of the file. |
If a IsolatedStorageFileStream object is writable, writing at the end of the stream expands the stream.
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 EndWrite with the IAsyncResult object that this method returns to find out how many bytes were written.
Available since 1.1
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0