FileStream.EndWrite(IAsyncResult) 方法
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
結束非同步寫入作業並封鎖，直到 I/O 作業完成。 (請考慮用 WriteAsync(Byte[], Int32, Int32, CancellationToken) 替代。)
public:
override void EndWrite(IAsyncResult ^ asyncResult);C#
public override void EndWrite (IAsyncResult asyncResult);override this.EndWrite : IAsyncResult -> unitPublic Overrides Sub EndWrite (asyncResult As IAsyncResult)- asyncResult
- IAsyncResult
暫止的非同步 I/O 要求。
asyncResult 為 null。
這個 IAsyncResult 物件不是透過對這個類別呼叫 BeginWrite(Byte[], Int32, Int32, AsyncCallback, Object) 所建立。
資料流已關閉或發生內部錯誤。
此程式代碼範例是為建構函式提供的較大範例的 FileStream(String, FileMode, FileAccess, FileShare, Int32, Boolean) 一部分。
static void EndWriteCallback( IAsyncResult^ asyncResult )
{
State^ tempState = dynamic_cast<State^>(asyncResult->AsyncState);
FileStream^ fStream = tempState->FStream;
fStream->EndWrite( asyncResult );
// Asynchronously read back the written data.
fStream->Position = 0;
asyncResult = fStream->BeginRead( tempState->ReadArray, 0, tempState->ReadArray->Length, gcnew AsyncCallback( &FStream::EndReadCallback ), tempState );
// Concurrently do other work, such as
// logging the write operation.
}
};
C#
static void EndWriteCallback(IAsyncResult asyncResult)
{
State tempState = (State)asyncResult.AsyncState;
FileStream fStream = tempState.FStream;
fStream.EndWrite(asyncResult);
// Asynchronously read back the written data.
fStream.Position = 0;
asyncResult = fStream.BeginRead(
tempState.ReadArray, 0 , tempState.ReadArray.Length,
new AsyncCallback(EndReadCallback), tempState);
// Concurrently do other work, such as
// logging the write operation.
}
let endWriteCallback (asyncResult: IAsyncResult) =
let tempState = asyncResult.AsyncState :?> State
let fStream = tempState.FStream
fStream.EndWrite asyncResult
// Asynchronously read back the written data.
fStream.Position <- 0
let asyncResult =
fStream.BeginRead(tempState.ReadArray, 0, tempState.ReadArray.Length, AsyncCallback endReadCallback, tempState)
// Concurrently do other work, such as
// logging the write operation.
()
Private Shared Sub EndWriteCallback(asyncResult As IAsyncResult)
Dim tempState As State = _
DirectCast(asyncResult.AsyncState, State)
Dim fStream As FileStream = tempState.FStream
fStream.EndWrite(asyncResult)
' Asynchronously read back the written data.
fStream.Position = 0
asyncResult = fStream.BeginRead( _
tempState.ReadArray, 0 , tempState.ReadArray.Length, _
AddressOf EndReadCallback, tempState)
' Concurrently do other work, such as
' logging the write operation.
End Sub
在 .NET Framework 4 和舊版中，您必須使用 和 之類的BeginWriteEndWrite方法來實作異步檔案作業。 這些方法仍可在 .NET Framework 4.5 中使用，以支援舊版程式代碼;不過，新的異步方法，例如 ReadAsync、WriteAsync、 CopyToAsync和 FlushAsync，可協助您更輕鬆地實作異步檔案作業。
這個方法會覆寫 EndWrite。
EndWrite每個都必須從BeginWrite呼叫一次IAsyncResult。 EndWrite 將會封鎖直到 I/O 作業完成為止。
| 產品 | 版本 |
|---|---|
| .NET | Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
| .NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
| .NET Standard | 2.0, 2.1 |
