var srcTbl = "20161226";
var destTbl = "20161226-bak";

方式一：

MongoClient client;
MongoServer server;
MongoDatabase db;

MongoClientSettings setting = new MongoClientSettings();
setting.MaxConnectionPoolSize = 1000;
setting.MinConnectionPoolSize = 500;

client = new MongoClient(mongodb);

server = client.GetServer();
db = server.GetDatabase(database);

db.CreateCollection(destTbl);
db.GetCollection(srcTbl).FindAll().Foreach(doc =>
{
      db.GetCollection(destTbl).Insert(doc); // start to replace
});

方式二：

Mongo目录下需文件：

libeay32.dll

mongoexport.exe

mongoimport.exe

ssleay32.dll

/// <summary>
        /// 导出数据库到文件
        /// </summary>
        /// <param name="host">数据库地址</param>
        /// <param name="username">数据库用户名</param>
        /// <param name="password">数据库密码</param>
        /// <param name="port">数据库端口号</param>
        /// <param name="database">数据库名称</param>
        /// <param name="table">数据表名</param>
        /// <param name="filename">导出的文件</param>
        void Export(string host, string username, string password, int port, string database, string table, string filename)
        {
            try
            {
                string arguments = string.Format(@"--host {0} --username {1} --password {2} --authenticationDatabase admin --port {3} --db {4} --collection {5} --out ""{6}""",
                    host, username, password, port, database, table, filename);
                string fileName = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"Mongo\mongoexport");

                Process p = new Process();
                ProcessStartInfo startInfo = new ProcessStartInfo
                {
                    FileName = fileName,
                    Arguments = arguments,
                    CreateNoWindow = true,
                    UseShellExecute = false
                };
                p.StartInfo = startInfo;
                p.Start();
                p.WaitForExit();
            }
            catch (Exception ex)
            {
                log.Error("Export error", ex, "流量数据存储服务", "Export Mongo", "", new LogMsg() { Key = "file", Value = http://www.mamicode.com/filename });
            }
        }
        /// <summary>
        /// 文件导入到数据库
        /// </summary>
        /// <param name="host">数据库地址</param>
        /// <param name="username">数据库用户名</param>
        /// <param name="password">数据库密码</param>
        /// <param name="port">数据库端口号</param>
        /// <param name="database">数据库名称</param>
        /// <param name="table">导入的数据表名</param>
        /// <param name="filename">导入的文件</param>
        void Import(string host, string username, string password, int port, string database, string table, string filename)
        {
            try
            {
                string arguments = string.Format(@"--host {0} --username {1} --password {2} --authenticationDatabase admin  --port {3} --db {4} --collection {5} --file ""{6}""",
                    host, username, password, port, database, table, filename);
                string fileName = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, @"Mongo\mongoimport");
                Process p = new Process();
                ProcessStartInfo startInfo = new ProcessStartInfo
                {
                    FileName = fileName,
                    Arguments = arguments,
                    CreateNoWindow = true,
                    UseShellExecute = false
                };
                p.StartInfo = startInfo;
                p.Start();
                p.WaitForExit();
            }
            catch (Exception ex)
            {
                log.Error("Import error", ex, "流量数据存储服务", "Import Mongo", "", new LogMsg() { Key = "table", Value = http://www.mamicode.com/table });
            }
        }

MongoDB 导出、导入表