StreamReader.CurrentEncoding 属性
获取当前 StreamReader 对象正在使用的当前字符编码。
**命名空间:**System.IO
**程序集:**mscorlib（在 mscorlib.dll 中）
语法
声明
Public Overridable ReadOnly Property CurrentEncoding As Encoding
用法
Dim instance As StreamReader
Dim value As Encoding
value = instance.CurrentEncoding
public virtual Encoding CurrentEncoding { get; }
public:
virtual property Encoding^ CurrentEncoding {
Encoding^ get ();
}
/** @property */
public Encoding get_CurrentEncoding ()
public function get CurrentEncoding () : Encoding
属性值
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。
备注
有关此属性的用法示例，请参见示例部分。下表列出了其他典型或相关的 I/O 任务的示例。
若要执行此操作... |
请参见本主题中的示例... |
|---|---|
创建文本文件。 |
|
写入文本文件。 |
|
读取文本文件。 |
|
向文件中追加文本。 |
|
获取文件大小。 |
|
获取文件属性。 |
|
设置文件属性。 |
|
确定文件是否存在。 |
|
读取二进制文件。 |
|
写入二进制文件。 |
示例
下面的代码示例获取指定的 StreamReader 对象的编码。
Imports System
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
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());
}
}
}
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 );
}
}
import System.*;
import System.IO.*;
import System.Text.*;
class Test
{
public static void main(String[] args)
{
String path = "c:\\temp\\MyTest.txt";
try {
if (File.Exists(path)) {
File.Delete(path);
}
//Use an encoding other than the default (UTF8).
StreamWriter sw = new StreamWriter(path, false,
new UnicodeEncoding());
try {
sw.WriteLine("This");
sw.WriteLine("is some text");
sw.WriteLine("to test");
sw.WriteLine("Reading");
}
finally {
sw.Dispose();
}
StreamReader sr = new 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.get_CurrentEncoding());
Console.WriteLine();
}
finally {
sr.Dispose();
}
}
catch (System.Exception e) {
Console.WriteLine("The process failed: {0}", e.ToString());
}
} //main
} //Test
平台
Windows 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。
版本信息
.NET Framework
受以下版本支持：2.0、1.1、1.0
.NET Compact Framework
受以下版本支持：2.0、1.0
请参见
参考
StreamReader 类
StreamReader 成员
System.IO 命名空间