.net 汉字转拼音首字母

短命女 2021-07-04 21:40 456阅读 0赞

## Program.cs ##

using amazingdemo.common;
    using System;
    using System.Collections;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    
    namespace amazingdemo
    { 
        class Program
        { 
            static void Main(string[] args)
            { 
                SortHelper alphaGroupHelper = new SortHelper();
                Console.WriteLine("======================");
                ArrayList list = new ArrayList();
                list.Add("adisen");
                list.Add("bulsi");
                list.Add("Kobe");
                list.Add("布丁");
                list.Add("杜甫");
                list.Add("元方");
                IDictionary map = alphaGroupHelper.sort(list);
                Console.WriteLine("-------分组后的输出-----------");
    
                Console.WriteLine("A分组:");
                list = (ArrayList)map["A"];
                for (int i = 0; i < list.Count; i++)
                { 
                    Console.WriteLine(list[i]);
                }
                Console.WriteLine("B分组:");
                list = (ArrayList)map["B"];
                for (int i = 0; i < list.Count; i++)
                { 
                    Console.WriteLine(list[i]);
                }
    
                Console.WriteLine("C分组:");
                list = (ArrayList)map["C"];
                for (int i = 0; i < list.Count; i++)
                { 
                    Console.WriteLine(list[i]);
                }
    
                Console.WriteLine("D分组:");
                list = (ArrayList)map["D"];
                for (int i = 0; i < list.Count; i++)
                { 
                    Console.WriteLine(list[i]);
                }
    
                Console.WriteLine("Y分组:");
                list = (ArrayList)map["Y"];
                for (int i = 0; i < list.Count; i++)
                { 
                    Console.WriteLine(list[i]);
                }
    
                Console.ReadKey();
            }
        }
    }

## SortHelper.cs ##

using System;
    using System.Collections;
    using System.Collections.Generic;
    using System.Linq;
    using System.Security.Policy;
    using System.Text;
    using System.Text.RegularExpressions;
    using System.Threading.Tasks;
    
    namespace amazingdemo.common
    { 
        public class SortHelper
        { 
            //字母Z使用了两个标签，这里有27个值
            //i, u, v都不做声母, 跟随前面的字母
            private readonly char[] chartable =
            { 
                '啊', '芭', '擦', '搭', '蛾', '发', '噶', '哈', '哈',
                '击', '喀', '垃', '妈', '拿', '哦', '啪', '期', '然',
                '撒', '塌', '塌', '塌', '挖', '昔', '压', '匝', '座'
            };
    
            private readonly char[] alphatableb =
            { 
                'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I',
                'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'
            };
    
            private readonly char[] alphatables =
            { 
                'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i',
                'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'
            };
    
            private readonly int[] table = new int[27]; //初始化
    
            public SortHelper()
            { 
                for (int i = 0; i < 27; ++i)
                { 
                    table[i] = gbValue(chartable[i]);
                }
            }
    
            //转字母
            protected virtual char Char2Alpha(char ch, string type)
            { 
                if (ch >= 'a' && ch <= 'z')
                { 
                    return (char) (ch - 'a' + 'A'); //为了按字母排序先返回大写字母
                }
    
                if (ch >= 'A' && ch <= 'Z')
                { 
                    return ch;
                }
    
                int gb = gbValue(ch);
                if (gb < table[0])
                { 
                    return '0';
                }
    
                int i;
                for (i = 0; i < 26; ++i)
                { 
                    if (match(i, gb))
                    { 
                        break;
                    }
                }
    
                if (i >= 26)
                { 
                    return '0';
                }
                else
                { 
                    if ("b".Equals(type))
                    { 
                        //大写
                        return alphatableb[i];
                    }
                    else
                    { 
                        //小写
                        return alphatables[i];
                    }
                }
            }
    
            //根据一个包含汉字的字符串返回一个汉字拼音首字母的字符串
            public virtual string String2Alpha(string SourceStr, string type)
            { 
                string Result = "";
                int StrLength = SourceStr.Length;
                int i;
                try
                { 
                    for (i = 0; i < StrLength; i++)
                    { 
                        Result += Char2Alpha(SourceStr[i], type);
                    }
                }
                catch (Exception)
                { 
                    Result = "";
                }
    
                return Result;
            }
    
            //根据一个包含汉字的字符串返回第一个汉字拼音首字母的字符串
            protected virtual string String2AlphaFirst(string SourceStr, string type)
            { 
                string Result = "";
                try
                { 
                    Result += Char2Alpha(SourceStr[0], type);
                }
                catch (Exception)
                { 
                    Result = "";
                }
    
                return Result;
            }
    
            private bool match(int i, int gb)
            { 
                if (gb < table[i])
                { 
                    return false;
                }
    
                int j = i + 1;
    
                //字母Z使用了两个标签
                while (j < 26 && (table[j] == table[i]))
                { 
                    ++j;
                }
    
                if (j == 26)
                { 
                    return gb <= table[j];
                }
                else
                { 
                    return gb < table[j];
                }
            }
    
            //取出汉字的编码
            private int gbValue(char ch)
            { 
                #region 方法一
                //byte[] gb2312 = Encoding.GetEncoding("GB2312").GetBytes(new char[] { ch }); //获得编码字节序列
                //int n = (int)gb2312[0] << 8; //第一个字节序列左移8位
                //n += (int)gb2312[1];
                //return n;
                #endregion
    
                #region 方法二，也可用
                string str = "";
                str += ch;
                try
                { 
                    sbyte[] bytes = str.GetBytes("GBK");
                    if (bytes.Length < 2)
                    { 
                        return 0;
                    }
                    return (bytes[0] << 8 & 0xff00) + (bytes[1] & 0xff);
                }
                catch (Exception e)
                { 
                    Console.Write(e.ToString());
                    return 0;
                }
                #endregion
            }
    
            public virtual IDictionary sort(IList list)
            { 
                IDictionary map = new Hashtable();
                ArrayList arraylist = new ArrayList();
                string[] alphatableb = new string[]
                { 
                    "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U",
                    "V", "W", "X", "Y", "Z"
                };
                foreach (string a in alphatableb)
                { 
                    for (int i = 0; i < list.Count; i++)
                    { 
                        //方法一
                        //为了排序都返回大写字母
                        if (a.Equals(String2AlphaFirst(list[i].ToString(), "b")))
                        { 
                            arraylist.Add(list[i].ToString());
                        }
    
                        //方法二
                        //if (a.Equals(GetOneByName(list[i].ToString()).ToUpper()))
                        //{ 
                        // arraylist.Add(list[i].ToString());
                        //}
                    }
    
                    map[a] = arraylist;
                    arraylist = new ArrayList();
                }
    
                return map;
            }
    
            /*------------------------------方法二---------------------------------*/
            /// <summary>
            /// 通过汉字区位码得到其首字母(小写)
            /// </summary>
            /// <param name="nCode">汉字编码</param>
            /// <returns></returns>
            private string FirstLetter(int nCode)
            { 
                if (nCode >= 1601 && nCode < 1637) return "a";
                if (nCode >= 1637 && nCode < 1833) return "b";
                if (nCode >= 1833 && nCode < 2078) return "c";
                if (nCode >= 2078 && nCode < 2274) return "d";
                if (nCode >= 2274 && nCode < 2302) return "e";
                if (nCode >= 2302 && nCode < 2433) return "f";
                if (nCode >= 2433 && nCode < 2594) return "g";
                if (nCode >= 2594 && nCode < 2787) return "h";
                if (nCode >= 2787 && nCode < 3106) return "j";
                if (nCode >= 3106 && nCode < 3212) return "k";
                if (nCode >= 3212 && nCode < 3472) return "l";
                if (nCode >= 3472 && nCode < 3635) return "m";
                if (nCode >= 3635 && nCode < 3722) return "n";
                if (nCode >= 3722 && nCode < 3730) return "o";
                if (nCode >= 3730 && nCode < 3858) return "p";
                if (nCode >= 3858 && nCode < 4027) return "q";
                if (nCode >= 4027 && nCode < 4086) return "r";
                if (nCode >= 4086 && nCode < 4390) return "s";
                if (nCode >= 4390 && nCode < 4558) return "t";
                if (nCode >= 4558 && nCode < 4684) return "w";
                if (nCode >= 4684 && nCode < 4925) return "x";
                if (nCode >= 4925 && nCode < 5249) return "y";
                if (nCode >= 5249 && nCode < 5590) return "z";
                return "";
            }
    
            /// <summary> 
            /// 判断是否为汉字 
            /// </summary> 
            /// <param name="chrStr">待检测字符串</param> 
            /// <returns>是汉字返回true</returns> 
            private bool IsChineseCharacters(string chrStr)
            { 
                Regex CheckStr = new Regex("[\u4e00-\u9fa5]");
                return CheckStr.IsMatch(chrStr);
            }
    
            /// <summary>
            /// 得到每个汉字的字首拼音码字母(小写)
            /// </summary>
            /// <param name="chrStr">输入字符串</param>
            /// <returns>返回结果</returns>
            private string ChangeByName(string chrStr)
            { 
                string strHeadString = string.Empty;
                Encoding gb = System.Text.Encoding.GetEncoding("gb2312");
    
                for (int i = 0; i < chrStr.Length; i++)
                { 
                    //检测该字符是否为汉字
                    if (!IsChineseCharacters(chrStr.Substring(i, 1)))
                    { 
                        strHeadString += chrStr.Substring(i, 1);
                        continue;
                    }    
    
                    byte[] bytes = gb.GetBytes(chrStr.Substring(i, 1));
                    string lowCode = Convert.ToString(bytes[0] - 0xA0, 16);
                    string hightCode = Convert.ToString(bytes[1] - 0xA0, 16);
                    int nCode = Convert.ToUInt16(lowCode, 16) * 100 + Convert.ToUInt16(hightCode, 16); //得到区位码
                    strHeadString += FirstLetter(nCode);
                }
    
                return strHeadString;
            }
    
            /// <summary>
            /// 得到第一个的字首拼音码字母(小写)
            /// </summary>
            /// <param name="chrStr">输入字符串</param>
            /// <returns>返回结果</returns>
            private string GetOneByName(string chrStr)
            { 
                String FirstText=chrStr.Substring(0, 1);
                string strHeadString = string.Empty;
                Encoding gb = System.Text.Encoding.GetEncoding("gb2312");
    
                //检测该字符是否为汉字
                if (!IsChineseCharacters(FirstText))
                { 
                    strHeadString += FirstText;
                }
                else
                { 
                    byte[] bytes = gb.GetBytes(FirstText);
                    string lowCode = Convert.ToString(bytes[0] - 0xA0, 16);
                    string hightCode = Convert.ToString(bytes[1] - 0xA0, 16);
                    int nCode = Convert.ToUInt16(lowCode, 16) * 100 + Convert.ToUInt16(hightCode, 16); //得到区位码
                    strHeadString += FirstLetter(nCode);
                }
                return strHeadString;
            }
            /*------------------------------方法二END---------------------------------*/
        }
    
        static class StringHelperClass
        { 
            static string SubstringSpecial(this string self, int start, int end)
            { 
                return self.Substring(start, end - start);
            }
    
            static bool StartsWith(this string self, string prefix, int toffset)
            { 
                return self.IndexOf(prefix, toffset, System.StringComparison.Ordinal) == toffset;
            }
    
            static string[] Split(this string self, string regexDelimiter, bool trimTrailingEmptyStrings)
            { 
                string[] splitArray = System.Text.RegularExpressions.Regex.Split(self, regexDelimiter);
    
                if (trimTrailingEmptyStrings)
                { 
                    if (splitArray.Length > 1)
                    { 
                        for (int i = splitArray.Length; i > 0; i--)
                        { 
                            if (splitArray[i - 1].Length > 0)
                            { 
                                if (i < splitArray.Length)
                                    System.Array.Resize(ref splitArray, i);
    
                                break;
                            }
                        }
                    }
                }
    
                return splitArray;
            }
    
            static string NewString(sbyte[] bytes)
            { 
                return NewString(bytes, 0, bytes.Length);
            }
    
            static string NewString(sbyte[] bytes, int index, int count)
            { 
                return System.Text.Encoding.UTF8.GetString((byte[]) (object) bytes, index, count);
            }
    
            static string NewString(sbyte[] bytes, string encoding)
            { 
                return NewString(bytes, 0, bytes.Length, encoding);
            }
    
            static string NewString(sbyte[] bytes, int index, int count, string encoding)
            { 
                return System.Text.Encoding.GetEncoding(encoding).GetString((byte[]) (object) bytes, index, count);
            }
    
            internal  static sbyte[] GetBytes(this string self)
            { 
                return GetSBytesForEncoding(System.Text.Encoding.UTF8, self);
            }
    
            internal static sbyte[] GetBytes(this string self, System.Text.Encoding encoding)
            { 
                return GetSBytesForEncoding(encoding, self);
            }
    
            internal static sbyte[] GetBytes(this string self, string encoding)
            { 
                return GetSBytesForEncoding(System.Text.Encoding.GetEncoding(encoding), self);
            }
    
            private static sbyte[] GetSBytesForEncoding(System.Text.Encoding encoding, string s)
            { 
                sbyte[] sbytes = new sbyte[encoding.GetByteCount(s)];
                encoding.GetBytes(s, 0, s.Length, (byte[]) (object) sbytes, 0);
                return sbytes;
            }
        }
    }

> 如果不是`.NET framework`，而是使用`.NET Core` 中使用GB2312编码报错的问题  
> `System.Text.Encoding.GetEncodings();`发现获得的编码中没有`GB2312`或者`GBK`。  
> 需要nuget安装包：`System.Text.Encoding.CodePages`

## 如图 ##

![在这里插入图片描述][20200427104859875.png]

[20200427104859875.png]: /images/20210704/97c3cd1d21c842739e12c8b798666faa.png