BufferedStream.Flush 方法

定义

命名空间:

System.IO

程序集:

System.Runtime.dll

Source:

BufferedStream.cs

清除此流的所有缓冲区并导致所有缓冲数据都写入基础设备中。

public:
 override void Flush();

public override void Flush ();

override this.Flush : unit -> unit

Public Overrides Sub Flush ()

例外

ObjectDisposedException

已释放流。

IOException

数据源或储存库未打开。

示例

此代码示例是为 BufferedStream 类提供的一个更大示例的一部分。

// Send the data using the BufferedStream.
Console::WriteLine( "Sending data using BufferedStream." );
startTime = DateTime::Now;
for ( int i = 0; i < numberOfLoops; i++ )
{
   bufStream->Write( dataToSend, 0, dataToSend->Length );

}
bufStream->Flush();
bufferedTime = (DateTime::Now - startTime).TotalSeconds;
Console::WriteLine( "{0} bytes sent in {1} seconds.\n", (numberOfLoops * dataToSend->Length).ToString(), bufferedTime.ToString(  "F1" ) );

// Send the data using the BufferedStream.
Console.WriteLine("Sending data using BufferedStream.");
startTime = DateTime.Now;
for(int i = 0; i < numberOfLoops; i++)
{
    bufStream.Write(dataToSend, 0, dataToSend.Length);
}
bufStream.Flush();
bufferedTime = (DateTime.Now - startTime).TotalSeconds;
Console.WriteLine("{0} bytes sent in {1} seconds.\n",
    numberOfLoops * dataToSend.Length,
    bufferedTime.ToString("F1"));

// Send the data using the BufferedStream.
printfn "Sending data using BufferedStream."
let startTime = DateTime.Now
for _ = 0 to numberOfLoops - 1 do
    bufStream.Write(dataToSend, 0, dataToSend.Length)
bufStream.Flush()
let bufferedTime = (DateTime.Now - startTime).TotalSeconds
printfn $"{numberOfLoops * dataToSend.Length} bytes sent in {bufferedTime:F1} seconds.\n"

' Send the data using the BufferedStream.
Console.WriteLine("Sending data using BufferedStream.")
startTime = DateTime.Now
For i As Integer = 1 To numberOfLoops
    bufStream.Write(dataToSend, 0, dataToSend.Length)
Next i

bufStream.Flush()
bufferedTime = DateTime.Now.Subtract(startTime).TotalSeconds
Console.WriteLine("{0} bytes sent In {1} seconds." & vbCrLf, _
    numberOfLoops * dataToSend.Length, _
    bufferedTime.ToString("F1"))

注解

除非显式调用 Flush 或 Close，否则刷新流不会刷新其基础编码器。

如果使用 BufferedStream 构造函数，从而在创建 BufferedStream 对象时指定缓冲区大小，则在内容达到缓冲区大小时将刷新。 例如，当缓冲区大小达到 5 个字节时，等 BufferedStream bs = new BufferedStream(bs, 5) 代码将刷新内容。

的所有读取和写入方法 BufferedStream 都会自动维护缓冲区，因此在读取和写入之间来回切换时无需调用 Flush 。

另请参阅

• Close()
• 文件和流 I/O
• 如何：从文件中读取文本
• 如何：将文本写入文件