FileStream.ReadByte 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。
從檔案讀取一個位元組，並將讀取位置前移一個位元組。
public:
override int ReadByte();C#
public override int ReadByte ();override this.ReadByte : unit -> intPublic Overrides Function ReadByte () As Integer轉換為 Int32 的位元組，如果已經到達資料流的末端，則為 -1。
目前的資料流不支援讀取。
目前的資料流已關閉。
下列程式代碼範例示範如何將數據寫入檔案、位元組位元組，然後確認數據已正確寫入。
using namespace System;
using namespace System::IO;
int main()
{
String^ fileName = "Test@##@.dat";
// Create random data to write to the file.
array<Byte>^dataArray = gcnew array<Byte>(100000);
(gcnew Random)->NextBytes( dataArray );
FileStream^ fileStream = gcnew FileStream( fileName,FileMode::Create );
try
{
// Write the data to the file, byte by byte.
for ( int i = 0; i < dataArray->Length; i++ )
{
fileStream->WriteByte( dataArray[ i ] );
}
// Set the stream position to the beginning of the file.
fileStream->Seek( 0, SeekOrigin::Begin );
// Read and verify the data.
for ( int i = 0; i < fileStream->Length; i++ )
{
if ( dataArray[ i ] != fileStream->ReadByte() )
{
Console::WriteLine( "Error writing data." );
return -1;
}
}
Console::WriteLine( "The data was written to {0} "
"and verified.", fileStream->Name );
}
finally
{
fileStream->Close();
}
}
C#
using System;
using System.IO;
class FStream
{
static void Main()
{
const string fileName = "Test#@@#.dat";
// Create random data to write to the file.
byte[] dataArray = new byte[100000];
new Random().NextBytes(dataArray);
using(FileStream
fileStream = new FileStream(fileName, FileMode.Create))
{
// Write the data to the file, byte by byte.
for(int i = 0; i < dataArray.Length; i++)
{
fileStream.WriteByte(dataArray[i]);
}
// Set the stream position to the beginning of the file.
fileStream.Seek(0, SeekOrigin.Begin);
// Read and verify the data.
for(int i = 0; i < fileStream.Length; i++)
{
if(dataArray[i] != fileStream.ReadByte())
{
Console.WriteLine("Error writing data.");
return;
}
}
Console.WriteLine("The data was written to {0} " +
"and verified.", fileStream.Name);
}
}
}
open System
open System.IO
let fileName = "Test#@@#.dat"
// Create random data to write to the file.
let dataArray = Array.zeroCreate 100000
Random.Shared.NextBytes dataArray
do
use fileStream = new FileStream(fileName, FileMode.Create)
// Write the data to the file, byte by byte.
for i = 0 to dataArray.Length - 1 do
fileStream.WriteByte dataArray[i]
// Set the stream position to the beginning of the file.
fileStream.Seek(0, SeekOrigin.Begin) |> ignore
// Read and verify the data.
for i in 0L .. fileStream.Length - 1L do
if dataArray[int i] <> (fileStream.ReadByte() |> byte) then
printfn "Error writing data."
exit 1
printfn $"The data was written to {fileStream.Name} and verified."
Imports System.IO
Imports System.Text
Class FStream
Shared Sub Main()
Const fileName As String = "Test#@@#.dat"
' Create random data to write to the file.
Dim dataArray(100000) As Byte
Dim randomGenerator As New Random()
randomGenerator.NextBytes(dataArray)
Dim fileStream As FileStream = _
new FileStream(fileName, FileMode.Create)
Try
' Write the data to the file, byte by byte.
For i As Integer = 0 To dataArray.Length - 1
fileStream.WriteByte(dataArray(i))
Next i
' Set the stream position to the beginning of the stream.
fileStream.Seek(0, SeekOrigin.Begin)
' Read and verify the data.
For i As Integer = 0 To _
CType(fileStream.Length, Integer) - 1
If dataArray(i) <> fileStream.ReadByte() Then
Console.WriteLine("Error writing data.")
Return
End If
Next i
Console.WriteLine("The data was written to {0} " & _
"and verified.", fileStream.Name)
Finally
fileStream.Close()
End Try
End Sub
End Class
這個方法會覆寫 ReadByte。
上的 Stream 預設實作會建立新的單一位元組數組，然後呼叫 Read(Byte[], Int32, Int32)。 雖然這正式正確，但效率不佳。 任何具有內部緩衝區的數據流都應該覆寫這個方法，並提供更有效率的版本來直接讀取緩衝區，以避免每次呼叫時都配置額外的數位。
如需一般檔案和目錄作業的清單，請參閱 一般 I/O 工作。
| 產品 | 版本 |
|---|---|
| .NET | Core 1.0, Core 1.1, 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 | 1.3, 1.4, 1.6, 2.0, 2.1 |
| UWP | 10.0 |
