1     class Program
 2     {
 3         static void Main(string[] args)
 4         {
 5             GenerateBom1();
 6             GenerateBom2();      
 7         }
 8         /// <summary>
 9         /// 方式一，利用UTF8Encoding构造函数来添加EF,BB,BF开头字节流
10         /// </summary>
11         static void GenerateBom1()
12         {
13             var encoding = new UTF8Encoding(true);
14             var filePath = Directory.GetCurrentDirectory() + "/bom1.txt";
15             if (File.Exists(filePath))
16             {
17                 File.Delete(filePath);
18             }
19             using (var reader = new StreamWriter(filePath, false, encoding))
20             {
21                //写入的内容
22                 reader.WriteLine("bom1");
23                 reader.Close();
24             }
25         }
26         /// <summary>
27         /// 方式二，手动方式添加EF,BB,BF开头字节流
28         /// </summary>
29         static void GenerateBom2()
30         {
31 //写入的内容
32             var list = new List<byte>(Encoding.UTF8.GetBytes("bom2"));
33             list.InsertRange(0, new byte[] { 239, 187, 191 });// EF=239 BB=187 BF=191
34             var filePath = Directory.GetCurrentDirectory() + "/bom2.txt";
35             if (File.Exists(filePath))
36             {
37                 File.Delete(filePath);
38             }
39             using (var stream = new FileStream(filePath, FileMode.CreateNew))
40             {
41                 stream.Write(list.ToArray(), 0, list.Count);
42                 stream.Close();
43             }
44         }
45     }

 1 static void JapaneseTest()
 2 {
 3     var dt = DateTime.Now;
 4     Console.WriteLine(dt);
 5     //日本日历
 6     var jpci = new System.Globalization.CultureInfo("ja-JP");
 7     var jpcal = new System.Globalization.JapaneseCalendar();
 8     jpci.DateTimeFormat.Calendar = jpcal;
 9     Console.WriteLine(dt.ToString("ggyy/MM/dd", jpci)); //令和01/10/07
10 }

 1    class Program
 2     {
 3         private const string Hankana =
 4        "ｧｱｨｲｩｳｪｴｫｵｶｶﾞｷｷﾞｸｸﾞｹｹﾞｺｺﾞｻｻﾞｼｼﾞｽｽﾞｾｾﾞｿｿﾞﾀﾀﾞﾁﾁﾞｯﾂﾂﾞﾃﾃﾞﾄﾄﾞﾅﾆﾇﾈﾉﾊﾊﾞﾊﾟﾋﾋﾞﾋﾟﾌﾌﾞﾌﾟﾍﾍﾞﾍﾟﾎﾎﾞﾎﾟﾏﾐﾑﾒﾓｬﾔｭﾕｮﾖﾗﾘﾙﾚﾛﾜｦﾝｳﾞﾜﾞｦﾞﾞﾟｰ｡｢｣､･";
 5 
 6         private const string Katakana =
 7             "ァアィイゥウェエォオカガキギクグケゲコゴサザシジスズセゼソゾタダチヂッツヅテデトドナニヌネノハバパヒビピフブプヘベペホボポマミムメモャヤュユョヨラリルレロワヲンヴ\u30F7\u30FA゛゜ー。「」、・";
 8 
 9         private const string Hiragana =
10             "ぁあぃいぅうぇえぉおかがきぎくぐけげこごさざしじすずせぜそぞただちぢっつづてでとどなにぬねのはばぱひびぴふぶぷへべぺほぼぽまみむめもゃやゅゆょよらりるれろわをん\u3094\u30F7\u30FA" +
11             "゛゜ー。「」、・";
12 
13         private const string KatakanaOdoriji = "ヽヾ";
14 
15         private const string HiraganaOdoriji = "ゝゞ";
16 
17         static void Main(string[] args)
18         {
19             Console.OutputEncoding = Encoding.UTF8;
20             // Katakana-Hankana
21             Console.WriteLine($"========================KatakanaToHankana======================");
22             Console.WriteLine($"old Katakana:{Katakana}");
23             Console.WriteLine($"converted Hankana:{KanaConverter.Convert(Katakana, KanaOption.KatakanaToHankana)}");
24             Console.WriteLine();
25 
26             //Hankana-Katakana
27             Console.WriteLine($"========================HankanaToKatakana=======================");
28             Console.WriteLine($"old Hankana:{Hankana}");
29             Console.WriteLine($"converted Katakana:{KanaConverter.Convert(Hankana, KanaOption.HankanaToKatakana)}");
30             Console.WriteLine();
31 
32             // Hiragana-Hankana   
33             Console.WriteLine($"========================HiraganaToHankana=======================");
34             Console.WriteLine($"old Hiragana:{Hiragana}");
35             Console.WriteLine($"converted Hankana:{KanaConverter.Convert(Hiragana, KanaOption.HiraganaToHankana)}");
36             Console.WriteLine();
37 
38             //Hankana--Hiragana 
39             Console.WriteLine($"========================HankanaToHiragana=======================");
40             Console.WriteLine($"old Hankana:{Hankana}");
41             Console.WriteLine($"converted Hiragana:{KanaConverter.Convert(Hankana, KanaOption.HankanaToHiragana)}");
42             Console.WriteLine();
43 
44             //Katakana-Hiragana      
45             Console.WriteLine($"========================KatakanaToHiragana=======================");
46             Console.WriteLine($"old Katakana:{Katakana}");
47             Console.WriteLine($"converted Hiragana:{KanaConverter.Convert(Katakana, KanaOption.KatakanaToHiragana)}");
48             Console.WriteLine();
49 
50             //Hiragana-Katakana         
51             Console.WriteLine($"========================HiraganaToKatakana=======================");
52             Console.WriteLine($"old Hiragana:{Hiragana}");
53             Console.WriteLine($"converted Katakana:{KanaConverter.Convert(Hiragana, KanaOption.HiraganaToKatakana)}");
54             Console.WriteLine();
55 
56             //Katakana-Hiragana
57             Console.WriteLine($"========================KatakanaToHiragana=======================");
58             Console.WriteLine($"old KatakanaOdoriji:{KatakanaOdoriji}");
59             Console.WriteLine($"converted HiraganaOdoriji:{KanaConverter.Convert(KatakanaOdoriji, KanaOption.KatakanaToHiragana)}");
60             Console.WriteLine();
61 
62             //Hiragana-Katakana  
63             Console.WriteLine($"========================HiraganaToKatakana=======================");
64             Console.WriteLine($"old HiraganaOdoriji:{HiraganaOdoriji}");
65             Console.WriteLine($"converted KatakanaOdoriji:{KanaConverter.Convert(HiraganaOdoriji, KanaOption.HiraganaToKatakana)}");
66             Console.WriteLine();
67             Console.ReadLine();
68 
69 
70         }
71     }

1         static void Main(string[] args)
2         {
3             Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);        
4             var jis = Encoding.GetEncoding("shift_jis");       
5             File.WriteAllText(Directory.GetCurrentDirectory() + "/a.txt", "こんにちは", jis);  
6         }