Add AsNavQueryable

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

@@ -45,7 +45,10 @@ namespace SqlSugar
             if (this.QueryBuilder.Includes == null) this.QueryBuilder.Includes = new List<object>();
             this.QueryBuilder.Includes.Add(navigat);
         }
-
+        public NavISugarQueryable<T> AsNavQueryable() 
+        {
+            return GetNavSugarQueryable();
+        }
         private  NavISugarQueryable<T> GetNavSugarQueryable()
         {
             var result= new NavQueryableProvider<T>();

Src/Asp.Net/SqlSugar/Interface/IIncludes.cs

@@ -13,6 +13,7 @@ namespace SqlSugar
     /// <typeparam name="T"></typeparam>
     public partial interface ISugarQueryable<T>
     {
+        NavISugarQueryable<T> AsNavQueryable();
         ISugarQueryable<T> Includes<TReturn1>(Expression<Func<T, List<TReturn1>>> include1);
         ISugarQueryable<T> Includes<TReturn1>(Expression<Func<T, TReturn1>> include1);
         ISugarQueryable<T> Includes<TReturn1, TReturn2>(Expression<Func<T, List<TReturn1>>> include1, Expression<Func<TReturn1, List<TReturn2>>> include2);