FileStream.BeginRead(Byte[], Int32, Int32, AsyncCallback, Object) Metode

Referensi

Definisi

Ruang nama:: System.IO

Rakitan:: System.Runtime.dll

Rakitan:: mscorlib.dll

Rakitan:: netstandard.dll

Sumber:: FileStream.cs

Sumber:: FileStream.cs

Sumber:: FileStream.cs

Penting

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Memulai operasi baca asinkron. Pertimbangkan untuk menggunakan ReadAsync(Byte[], Int32, Int32, CancellationToken) sebagai gantinya.

public:
 override IAsyncResult ^ BeginRead(cli::array <System::Byte> ^ array, int offset, int numBytes, AsyncCallback ^ callback, System::Object ^ state);

public:
 override IAsyncResult ^ BeginRead(cli::array <System::Byte> ^ buffer, int offset, int count, AsyncCallback ^ callback, System::Object ^ state);

public:
 override IAsyncResult ^ BeginRead(cli::array <System::Byte> ^ array, int offset, int numBytes, AsyncCallback ^ userCallback, System::Object ^ stateObject);

public override IAsyncResult BeginRead (byte[] array, int offset, int numBytes, AsyncCallback? callback, object? state);

public override IAsyncResult BeginRead (byte[] buffer, int offset, int count, AsyncCallback? callback, object? state);

public override IAsyncResult BeginRead (byte[] buffer, int offset, int count, AsyncCallback callback, object state);

public override IAsyncResult BeginRead (byte[] array, int offset, int numBytes, AsyncCallback callback, object state);

public override IAsyncResult BeginRead (byte[] array, int offset, int numBytes, AsyncCallback callback, object? state);

public override IAsyncResult BeginRead (byte[] array, int offset, int numBytes, AsyncCallback userCallback, object stateObject);

override this.BeginRead : byte[] * int * int * AsyncCallback * obj -> IAsyncResult

override this.BeginRead : byte[] * int * int * AsyncCallback * obj -> IAsyncResult

override this.BeginRead : byte[] * int * int * AsyncCallback * obj -> IAsyncResult

Public Overrides Function BeginRead (array As Byte(), offset As Integer, numBytes As Integer, callback As AsyncCallback, state As Object) As IAsyncResult

Public Overrides Function BeginRead (buffer As Byte(), offset As Integer, count As Integer, callback As AsyncCallback, state As Object) As IAsyncResult

Public Overrides Function BeginRead (array As Byte(), offset As Integer, numBytes As Integer, userCallback As AsyncCallback, stateObject As Object) As IAsyncResult

Parameter

arraybuffer: Byte[]

Buffer untuk membaca data.

offset: Int32

Offset byte untuk array mulai membaca.

numBytescount: Int32

Jumlah maksimum byte yang akan dibaca.

callbackuserCallback: AsyncCallback

Metode yang akan dipanggil ketika operasi baca asinkron selesai.

statestateObject: Object

Objek yang disediakan pengguna yang membedakan permintaan baca asinkron khusus ini dari permintaan lain.

Mengembalikan

IAsyncResult

Objek yang mereferensikan pembacaan asinkron.

Pengecualian

ArgumentException

Panjang array minus offset kurang dari numBytes.

ArgumentNullException

arrayadalah null.

ArgumentOutOfRangeException

offset atau numBytes negatif.

IOException

Pembacaan asinkron dicoba melewati akhir file.

Berlaku untuk