ModelContext模型上下文

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

 

namespace TeamService.Data

{

    public class ModelContextStatus

    {

        public const int DISABLED = 0x0000;

        public const int NORMAL = 0x0001;

        public const int DELETED = 0x0004;

    }

    /// <summary>

    /// EntityContext class provides unified access to EF entities

    /// </summary>

    public class ModelContext

    {

        public const int STATUS_DISABLED = ModelContextStatus.DISABLED;

        public const int STATUS_NORMAL = ModelContextStatus.NORMAL;

        public const int STATUS_DELETED = ModelContextStatus.DELETED;

        public const int REMOTE_SERVER = 0;

        public const int LOCAL_SERVER = 1;

 

        private static ModelContainer modelContext = null;

 

 

        /// <summary>

        /// Return current entity framework context, if the connection has not open

        /// yet, it will create the connection to database.

        /// </summary>

        public static ModelContainer Container

        {

            get

            {

                if (modelContext == null)

                {

                    modelContext = new ModelContainer();

                  

                    if (modelContext.Connection.State != System.Data.ConnectionState.Open)

                    {

                        modelContext.Connection.Open();

                    }

                }

                return modelContext;

            }

        }

    }

}