该
StreamReader.CurrentEncoding属性很少为我返回正确的文本文件编码。通过分析文件的字节序标记（BOM），我在确定文件的字节序方面取得了更大的成功。如果文件没有BOM，则无法确定文件的编码。
*已更新4/08/2020，包括UTF-32LE检测并返回UTF-32BE的正确编码
/// <summary>/// Determines a text file's encoding by analyzing its byte order mark (BOM)./// Defaults to ASCII when detection of the text file's endianness fails./// </summary>/// <param name="filename">The text file to analyze.</param>/// <returns>The detected encoding.</returns>public static Encoding GetEncoding(string filename){ // Read the BOM var bom = new byte[4]; using (var file = new FileStream(filename, FileMode.Open, FileAccess.Read)) { file.Read(bom, 0, 4); } // Analyze the BOM if (bom[0] == 0x2b && bom[1] == 0x2f && bom[2] == 0x76) return Encoding.UTF7; if (bom[0] == 0xef && bom[1] == 0xbb && bom[2] == 0xbf) return Encoding.UTF8; if (bom[0] == 0xff && bom[1] == 0xfe && bom[2] == 0 && bom[3] == 0) return Encoding.UTF32; //UTF-32LE if (bom[0] == 0xff && bom[1] == 0xfe) return Encoding.Unipre; //UTF-16LE if (bom[0] == 0xfe && bom[1] == 0xff) return Encoding.BigEndianUnipre; //UTF-16BE if (bom[0] == 0 && bom[1] == 0 && bom[2] == 0xfe && bom[3] == 0xff) return new UTF32Encoding(true, true); //UTF-32BE // We actually have no idea what the encoding is if we reach this point, so // you may wish to return null instead of defaulting to ASCII return Encoding.ASCII;}
