public static Encoding GetEncoding(StreamReader sr)
{
Encoding encoding = null;
using (BinaryReader binaryReader = new BinaryReader(sr.BaseStream))
{
byte[] array = binaryReader.ReadBytes(3);
if (array.Length <= 0)
{
return(Encoding.UTF8);
}
if (array.Length >= 3)
{
if (array[0] == EncodingDetector._utf8Header[0] && array[1] == EncodingDetector._utf8Header[1] &&
array[2] == EncodingDetector._utf8Header[2])
{
encoding = new Utf8EncodingIdentifier(true);
}
if (array[0] == EncodingDetector._unicodeHeader[0] && array[1] == EncodingDetector._unicodeHeader[1])
{
encoding = Encoding.Unicode;
}
if (array[0] == EncodingDetector._unicodeBigHeader[0] &&
array[1] == EncodingDetector._unicodeBigHeader[1])
{
encoding = Encoding.BigEndianUnicode;
}
if (array[0] == EncodingDetector._ansiHeader[0] &&
array[1] == EncodingDetector._ansiHeader[1] &&
array[2] == EncodingDetector._ansiHeader[2])
{
//无BOM的UTF8可能也会被解析成GB2312
encoding = Encoding.GetEncoding("GB2312");
}
}
if (encoding != null)
{
return(encoding);
}
sr.BaseStream.Seek(0L, SeekOrigin.Begin);
string charset = EncodingDetector.DetectStream(sr.BaseStream);
if (charset == "nomatch")
{
charset = Encoding.Default.BodyName;
}
try
{
encoding = Encoding.GetEncoding(charset);
}
catch (Exception)
{
encoding = Encoding.Default;
}
}
return(encoding);
}
public static Encoding GetEncoding(string path)
{
Encoding encoding;
using (StreamReader streamReader = new StreamReader(path, true))
{
encoding = EncodingDetector.GetEncoding(streamReader);
}
return(encoding);
}