Update Discrimator

Src/Asp.Net/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs

@@ -387,8 +387,10 @@ namespace SqlSugar
             {
                 this.Where(whereString);
             }
+            UtilMethods.AddDiscrimator(type,this);
             return this;
         }
+
         public virtual ISugarQueryable<T> Mapper(Action<T> mapperAction)
         {
             this.MapperAction=UtilMethods.IsNullReturnNew(this.MapperAction);

Src/Asp.Net/SqlSugar/Abstract/SugarProvider/SqlSugarProvider.cs

@@ -127,6 +127,7 @@ namespace SqlSugar
 
             InitMappingInfo<T>();
             var result = this.CreateQueryable<T>();
+            UtilMethods.AddDiscrimator(typeof(T), result);
             return result;
         }
         /// <summary>

Src/Asp.Net/SqlSugar/Utilities/UtilMethods.cs

@@ -1265,5 +1265,23 @@ namespace SqlSugar
             var method = value.GetType().GetMethods().First(it => it.GetParameters().Length == 0 && it.Name == "ToShortDateString");
             return method.Invoke(value, new object[] { });
         }
+
+
+        internal static void AddDiscrimator<T>(Type type, ISugarQueryable<T> queryable)
+        {
+            var entityInfo = queryable.Context?.EntityMaintenance?.GetEntityInfoWithAttr(type);
+            if (entityInfo!=null&&entityInfo.Discrimator.HasValue())
+            {
+                Check.ExceptionEasy(!Regex.IsMatch(entityInfo.Discrimator, @"^(?:\w+:\w+)(?:,\w+:\w+)*$"), "The format should be type:cat for this type, and if there are multiple, it can be FieldName:cat,FieldName2:dog ", "格式错误应该是type:cat这种格式，如果是多个可以FieldName:cat,FieldName2:dog，不要有空格");
+                var array = entityInfo.Discrimator.Split(',');
+                foreach (var disItem in array)
+                {
+                    var name = disItem.Split(':').First();
+                    var value = disItem.Split(':').Last();
+                    queryable.Where(name, "=", value);
+                }
+            }
+        }
+
     }
 }