ModelContext support inheritance

Src/Asp.Net/SqlServerTest/Demos/6_ComplexModel.cs

@@ -12,6 +12,7 @@ namespace OrmTest.Demo
         public static void Init()
         {
             var db = GetInstance();
+            db.Insertable(new CMStudent() { SchoolId = 1, Name = "xx1" }).ExecuteCommand();
             var students = db.Queryable<CMStudent>().ToList();
             if (students != null)
             {

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

@@ -1180,7 +1180,7 @@ namespace SqlSugar
         {
             if (result.HasValue())
             {
-                if (entityType.GetTypeInfo().BaseType.HasValue() && entityType.GetTypeInfo().BaseType == UtilConstants.ModelType)
+                if (UtilMethods.GetRootBaseType(entityType).HasValue() &&UtilMethods.GetRootBaseType(entityType) == UtilConstants.ModelType)
                 {
                     foreach (var item in result)
                     {

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

@@ -17,6 +17,17 @@ namespace SqlSugar
             return type==null ? oldType : type;
         }
 
+        internal static Type GetRootBaseType(Type entityType)
+        {
+            var baseType = entityType.BaseType;
+            while (baseType != null && baseType.BaseType != UtilConstants.ObjType)
+            {
+                baseType = baseType.BaseType;
+            }
+            return baseType;
+        }
+
+
         internal static Type GetUnderType(PropertyInfo propertyInfo, ref bool isNullable)
         {
             Type unType = Nullable.GetUnderlyingType(propertyInfo.PropertyType);