StreamReader.CurrentEncoding 属性

定义

命名空间:

System.IO

程序集:

System.Runtime.dll

Source:

StreamReader.cs

获取当前 StreamReader 对象正在使用的当前字符编码。

public:
 virtual property System::Text::Encoding ^ CurrentEncoding { System::Text::Encoding ^ get(); };

public virtual System.Text.Encoding CurrentEncoding { get; }

member this.CurrentEncoding : System.Text.Encoding

Public Overridable ReadOnly Property CurrentEncoding As Encoding

属性值

Encoding

当前读取器所使用的当前字符编码。 第一次调用 StreamReader 的任何 Read 方法后，该值可能会不同，因为直到第一次调用 Read 方法时，才会进行编码的自动检测。

示例

下面的代码示例获取指定 StreamReader 对象的编码。

using namespace System;
using namespace System::IO;
using namespace System::Text;

int main()
{
   String^ path = "c:\\temp\\MyTest.txt";
   try
   {
      if ( File::Exists( path ) )
      {
         File::Delete( path );
      }

      //Use an encoding other than the default (UTF8).
      StreamWriter^ sw = gcnew StreamWriter( path,false,gcnew UnicodeEncoding );
      try
      {
         sw->WriteLine( "This" );
         sw->WriteLine( "is some text" );
         sw->WriteLine( "to test" );
         sw->WriteLine( "Reading" );
      }
      finally
      {
         delete sw;
      }

      StreamReader^ sr = gcnew StreamReader( path,true );
      try
      {
         while ( sr->Peek() >= 0 )
         {
            Console::Write( (Char)sr->Read() );
         }

         //Test for the encoding after reading, or at least
         //after the first read.
         Console::WriteLine( "The encoding used was {0}.", sr->CurrentEncoding );
         Console::WriteLine();
      }
      finally
      {
         delete sr;
      }
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( "The process failed: {0}", e );
   }
}

using System;
using System.IO;
using System.Text;

class Test
{
    
    public static void Main()
    {
        string path = @"c:\temp\MyTest.txt";

        try
        {
            if (File.Exists(path))
            {
                File.Delete(path);
            }

            //Use an encoding other than the default (UTF8).
            using (StreamWriter sw = new StreamWriter(path, false, new UnicodeEncoding()))
            {
                sw.WriteLine("This");
                sw.WriteLine("is some text");
                sw.WriteLine("to test");
                sw.WriteLine("Reading");
            }

            using (StreamReader sr = new StreamReader(path, true))
            {
                while (sr.Peek() >= 0)
                {
                    Console.Write((char)sr.Read());
                }

                //Test for the encoding after reading, or at least
                //after the first read.
                Console.WriteLine("The encoding used was {0}.", sr.CurrentEncoding);
                Console.WriteLine();
            }
        }
        catch (Exception e)
        {
            Console.WriteLine("The process failed: {0}", e.ToString());
        }
    }
}

Imports System.IO
Imports System.Text

Public Class Test

    Public Shared Sub Main()
        Dim path As String = "c:\temp\MyTest.txt"
        Try
            If File.Exists(path) Then
                File.Delete(path)
            End If

            'Use an encoding other than the default (UTF8).
            Dim sw As StreamWriter = New StreamWriter(path, False, New UnicodeEncoding())
            sw.WriteLine("This")
            sw.WriteLine("is some text")
            sw.WriteLine("to test")
            sw.WriteLine("Reading")
            sw.Close()

            Dim sr As StreamReader = New StreamReader(path, True)

            Do While sr.Peek() >= 0
                Console.Write(Convert.ToChar(sr.Read()))
            Loop

            'Test for the encoding after reading, or at least
            'after the first read.
            Console.WriteLine("The encoding used was {0}.", sr.CurrentEncoding)
            Console.WriteLine()

            sr.Close()
        Catch e As Exception
            Console.WriteLine("The process failed: {0}", e.ToString())
        End Try
    End Sub
End Class

注解

有关常见 I/O 任务的列表，请参阅 常见 I/O 任务。

另请参阅

• 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