提交.Net6版本

Yi.Framework.Net5/Yi.Framework.Model/ModelFactory/DbContextExtend.cs

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+using Microsoft.EntityFrameworkCore;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Yi.Framework.Model.ModelFactory
+{
+    public static class DbContextExtend
+    { 
+        public static DbContext ToWriteOrRead(this DbContext dbContext, string conn)
+        {
+            if (dbContext is DataContext)
+            {
+
+                var context= (DataContext)dbContext; // context 是 EFCoreContext 实例；
+
+                return context.ToWriteOrRead(conn);
+            }
+            else
+                throw new Exception();
+        }
+    }
+}

Yi.Framework.Net5/Yi.Framework.Model/ModelFactory/DbContextFactory.cs

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+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Options;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Yi.Framework.Common.Enum;
+using Yi.Framework.Common.IOCOptions;
+
+namespace Yi.Framework.Model.ModelFactory
+{
+    public class DbContextFactory : IDbContextFactory
+    {
+
+        private DbContext _Context = null;
+
+        private DbConnOptions _readAndWrite = null;
+
+        public static bool MutiDB_Enabled = false;
+        //private static int _iSeed = 0;//应该long
+
+        /// <summary>
+        ///能把链接信息也注入进来
+        ///需要IOptionsMonitor
+        /// </summary>
+        /// <param name="context"></param>
+        public DbContextFactory(DbContext context, IOptionsMonitor<DbConnOptions> options)
+        {
+            _readAndWrite = options.CurrentValue;
+            this._Context = context;
+        }
+        public DbContext ConnWriteOrRead(WriteAndReadEnum writeAndRead)
+        {
+            //判断枚举，不同的枚举可以创建不同的Context 或者更换Context链接；
+            if (MutiDB_Enabled)
+            {
+                switch (writeAndRead)
+                {
+                    case WriteAndReadEnum.Write:
+                        ToWrite();
+                        break;  //选择链接//更换_Context链接   //选择链接
+                    case WriteAndReadEnum.Read:
+                        ToRead();
+                        break;  //选择链接//更换_Context链接
+                    default:
+                        break;
+                }
+            }
+            else
+            {
+                ToWrite();
+            }
+
+            return _Context;
+        }
+
+        /// <summary>
+        /// 更换成主库连接
+        /// </summary>
+        /// <returns></returns>
+        private void ToWrite()
+        {
+            string conn = _readAndWrite.WriteUrl;
+            //_Context.Database.GetDbConnection().;
+            _Context.ToWriteOrRead(conn);
+        }
+
+
+        private static int _iSeed = 0;
+
+        /// <summary>
+        /// 更换成主库连接
+        /// 
+        /// ///策略---数据库查询的负载均衡
+        /// </summary>
+        /// <returns></returns>
+        private void ToRead()
+        {
+            string conn = string.Empty;
+            {
+                // //随机
+                //int Count=  _readAndWrite.ReadConnectionList.Count;
+                //int index=  new Random().Next(0, Count);
+                //conn = _readAndWrite.ReadConnectionList[index];
+            }
+            {
+                //来一个轮询
+                conn = this._readAndWrite.ReadUrl[_iSeed++ % this._readAndWrite.ReadUrl.Count];//轮询;  
+            }
+            {
+                ///是不是可以直接配置到配置文件里面
+            }
+            _Context.ToWriteOrRead(conn);
+        }
+
+        //public DbContext CreateContext()
+        //{ 
+
+        //}
+    }
+}

Yi.Framework.Net5/Yi.Framework.Model/ModelFactory/IDbContextFactory.cs

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+using Microsoft.EntityFrameworkCore;
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Yi.Framework.Common.Enum;
+
+namespace Yi.Framework.Model.ModelFactory
+{
+    public  interface IDbContextFactory
+    {
+        public DbContext ConnWriteOrRead(WriteAndReadEnum writeAndRead);
+    }
+}