目前来说比较.net下最好的bdb操作封装（附单元测试）

<!--<br /> <br /> Code highlighting produced by Actipro CodeHighlighter (freeware)<br /> http://www.CodeHighlighter.com/<br /> <br /> -->  1using System;
  2using System.Collections.Generic;
  3using System.IO;
  4using System.Linq;
  5using System.Runtime.Serialization.Formatters.Binary;
  6using System.Text;
  7using BerkeleyDb;
  8using Component;
  9
 10namespace ToolManager
 11{
 12    public class BDBRecord
 13    {
 14        public object Key { get; set; }
 15        public string Value { get; set; }
 16    }    /**//// <summary>
 17    /// BDB数据库操作类库
 18    /// </summary>
 19    public class BDBHelper
 20    {
 21
 22        private string DBFilePath { get; set; }
 23        private DBStoreType DBType { get; set; }
 24        public enum DBStoreType : byte
 25        {
 26            Auto=1,
 27            Queue,
 28            Hash
 29        }
 30        [Obsolete("该构造函数已废弃 ，请使用BDBHelper(string dbfilePath)")]
 31        public BDBHelper()
 32        {
 33        }
 34
 35        public BDBHelper(string dbfilePath)
 36        {
 37            this.DBFilePath = dbfilePath;
 38        }
 39        [Obsolete("该构造函数已废弃 ，请使用BDBHelper(string dbfilePath)")]
 40        public BDBHelper(string dbfilePath, DBStoreType type)
 41        {
 42            this.DBFilePath = dbfilePath;
 43            this.DBType = type;
 44        }
 45        public BDBRecord FindOne()
 46        {
 47            return this.FindOne(null);
 48        }
 49        public BDBRecord FindOne(Func<object, string, bool> predicate)
 50        {
 51            //Dictionary<string, object> dict = new Dictionary<string, object>();
 52            try
 53            {
 54                Queue格式#region Queue格式
 55                //if (this.DBType == DBStoreType.Queue)
 56                //{
 57                using (Db db = new Db(DbCreateFlags.None))
 58                {
 59                    db.RecLen = 5000;
 60                    db.RecPad = '.';
 61                    DbQueue file = (DbQueue)db.Open(null, this.DBFilePath, null, DbType.Queue, Db.OpenFlags.Create, 0);
 62                    using (DbQueueCursor cursor = file.OpenCursor(null, DbFileCursor.CreateFlags.None))
 63                    {
 64                        foreach (KeyDataPair kvp in cursor)
 65                        {
 66                            BinaryFormatter bf = new BinaryFormatter();
 67                            MemoryStream stream = new MemoryStream();
 68                            stream.Write(kvp.Data.Buffer, 0, kvp.Data.Size);
 69                            stream.Seek(0, SeekOrigin.Begin);
 70                            string k = BitConverter.ToInt32(kvp.Key.Buffer, 0).ToString();
 71                            object v = bf.Deserialize(stream);
 72                            if (predicate == null)
 73                            {
 74                                return new BDBRecord() { Key = v, Value = k };
 75                            }
 76                            else if (predicate(v, k))
 77                            {
 78                                return new BDBRecord() { Key = v, Value = k };
 79                            }
 80                        }
 81                    }
 82                }
 83                //}
 84                #endregion
 85            }
 86            catch (Exception ex)
 87            {
 88                Hash格式#region Hash格式
 89                //else if(this.DBType==DBStoreType.Hash)
 90                //{
 91                //遍历数据
 92                using (Db db = new Db(DbCreateFlags.None))
 93                {
 94                    //这里如果应用Db.OpenFlags.Create则在启动后会覆盖同名文件，并新建同名文件
 95                    //Db.OpenFlags.Truncate会清空数据库
 96                    DbHash dbf = (DbHash)db.Open(null, this.DBFilePath, null, DbType.Hash,
 97        Db.OpenFlags.ThreadSafe, 0);
 98
 99                    using (DbHashCursor cursor = dbf.OpenCursor(null, DbFileCursor.CreateFlags.None))
100                    {
101                        foreach (KeyDataPair kvp in cursor)
102                        {
103                            BinaryFormatter bf = new BinaryFormatter();
104                            MemoryStream stream = new MemoryStream();
105                            stream.Write(kvp.Data.Buffer, 0, kvp.Data.Size);
106                            stream.Seek(0, SeekOrigin.Begin);
107                            string k = Encoding.UTF8.GetString(kvp.Key.Buffer, 0, kvp.Key.Size);
108                            object v = bf.Deserialize(stream);
109                            if (predicate == null)
110                            {
111                                return new BDBRecord() { Key = v, Value = k };
112                            }
113                            else if (predicate(v, k))
114                            {
115                                return new BDBRecord() { Key = v, Value = k };
116                            }
117                        }
118                    }
119                }
120                #endregion
121                //}
122            }
123            //return dict;
124            return null;
125        }
126        public Dictionary<object, string> FindAll(Func<object, string, bool> predicate)
127        {
128
129            Dictionary<object, string> dict = new Dictionary<object, string>();
130            try
131            {
132                Queue格式#region Queue格式
133                //if (this.DBType == DBStoreType.Queue)
134                //{
135                using (Db db = new Db(DbCreateFlags.None))
136                {
137                    db.RecLen = 5000;
138                    db.RecPad = '.';
139                    DbQueue file = (DbQueue)db.Open(null, this.DBFilePath, null, DbType.Queue, Db.OpenFlags.Create, 0);
140