Add demo

Src/Asp.NetCore2/MongoDbTest/UnitTest/UnitDateOnly.cs

@@ -6,6 +6,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
+using System.ComponentModel;
 
 namespace MongoDbTest 
 {
@@ -14,7 +15,7 @@ namespace MongoDbTest
         public static void Init()
         {
             var db = DbHelper.GetNewDb();
-            db.DbMaintenance.TruncateTable<DateOnlyModel>();
+            db.DbMaintenance.TruncateTable<DateOnlyModel, DateOnlyModel2>();
             var dt = DateOnly.FromDateTime(Convert.ToDateTime("2022-01-01"));
             var dt2 = DateOnly.FromDateTime(Convert.ToDateTime("2022-11-01"));
             db.Insertable(new DateOnlyModel()
@@ -32,6 +33,9 @@ namespace MongoDbTest
             var list2 = db.Queryable<DateOnlyModel>().Where(it=>it.DateOnly==dt).ToList();
             var list3 = db.Queryable<DateOnlyModel>().Where(it => it.DateOnly == dt2).ToList();
             if (list2.Count != 1 || list3.Count !=0 || list.Count != 2) Cases.ThrowUnitError();
+
+            db.Insertable(new DateOnlyModel2() { DateOnly=dt }).ExecuteCommand();
+            var list4=db.Queryable<DateOnlyModel2>().ToList();
         }
     } 
 
@@ -39,4 +43,79 @@ namespace MongoDbTest
     {
          public DateOnly DateOnly { get; set; } 
     }
+    public class DateOnlyModel2 : MongoDbBase
+    {
+        public DateOnly DateOnly { get; set; }
+
+        [SugarColumn(IsJson = true)]
+        public WeatherDataInfo[] DataInfo { get; set; } = new WeatherDataInfo[24];
+    }
+
+    public class WeatherDataInfo
+    {
+        /// <summary>
+        /// // 时间 
+        /// </summary>
+        public string Time { get; set; }
+
+        /// <summary>
+        /// // 天气状况 
+        /// </summary>
+        [Description("天气状况")]
+        public string WeatherCondition { get; set; }
+
+        /// <summary>
+        /// // 温度 
+        /// </summary>
+        [Description("温度")]
+        public double Temperature { get; set; }
+
+        /// <summary>
+        /// // 降雨几率 
+        /// </summary>
+        [Description("降雨几率")]
+        public double Precipitation { get; set; }
+
+        /// <summary>
+        /// 风速
+        /// </summary>
+        [Description("风速")]
+        public int Wind { get; set; }
+
+        /// <summary>
+        /// 风向
+        /// </summary>
+        [Description("风向")]
+        public string WindName { get; set; }
+
+        /// <summary>
+        /// 体感温度
+        /// </summary>
+        [Description("体感温度")]
+        public int FeelsLike { get; set; }
+
+        /// <summary>
+        /// 湿度
+        /// </summary>
+        [Description("湿度")]
+        public double Humidity { get; set; }
+
+        /// <summary>
+        /// 紫外线指数
+        /// </summary>
+        [Description("紫外线指数")]
+        public int UVIndex { get; set; }
+
+        /// <summary>
+        /// 云量
+        /// </summary>
+        [Description("云量")]
+        public double CloudCover { get; set; }
+
+        /// <summary>
+        /// 降雨量
+        /// </summary>
+        [Description("降雨量")]
+        public double Rainfall { get; set; }
+    }
 }

Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbInsertBuilder.cs

@@ -171,6 +171,10 @@ namespace SqlSugar.MongoDb
                         else
                         {
                             var obj = MongoDbDataReaderHelper.ConvertBsonValue(item);
+                            if (obj is DBNull) 
+                            {
+                                obj = null;
+                            }
                             resultList.SetValue(obj, index);
                         }
                         index++;