Add demo

Src/Asp.NetCore2/MongoDbTest/MongoDbTest.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net7.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
   </PropertyGroup>

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

@@ -39,6 +39,7 @@ namespace MongoDbTest
             Enum.Init();
             Enum2.Init();
             UnitDateTimeFunc.Init();
+            UnitDateOnly.Init();
             //主键不是ObjectId类型用例 
             //The primary key is not an ObjectId type use case
             LongPrimaryKey.Init();

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

@@ -0,0 +1,42 @@
+using MongoDB.Bson;
+using SqlSugar.MongoDb;
+using SqlSugar;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace MongoDbTest 
+{
+    internal class UnitDateOnly
+    {
+        public static void Init()
+        {
+            var db = DbHelper.GetNewDb();
+            db.DbMaintenance.TruncateTable<DateOnlyModel>();
+            var dt = DateOnly.FromDateTime(Convert.ToDateTime("2022-01-01"));
+            var dt2 = DateOnly.FromDateTime(Convert.ToDateTime("2022-11-01"));
+            db.Insertable(new DateOnlyModel()
+            {
+                DateOnly=dt
+
+            }).ExecuteCommand();
+            db.Insertable(new DateOnlyModel()
+            {
+                DateOnly = DateOnly.FromDateTime(Convert.ToDateTime("2022-12-01"))
+
+            }).ExecuteCommand();
+            var list = db.Queryable<DateOnlyModel>().ToList();
+
+            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();
+        }
+    } 
+
+    public class DateOnlyModel : MongoDbBase 
+    {
+         public DateOnly DateOnly { get; set; } 
+    }
+}

Src/Asp.NetCore2/SqlSugar.MongoDbCore/Tools/UtilMethods.cs

@@ -147,6 +147,12 @@ namespace SqlSugar.MongoDb
                 return arrayObj;
             }
         }
+        internal static object DateOnlyToDateTime(object value)
+        {
+            if (value == null) return null;
+            var method = value.GetType().GetMethods().First(it => it.GetParameters().Length == 0 && it.Name == "ToShortDateString");
+            return method.Invoke(value, new object[] { });
+        }
         public static BsonValue MyCreate(object value)
         {
             if (value is DateTime dt)
@@ -162,6 +168,10 @@ namespace SqlSugar.MongoDb
             {
                 value = ObjectId.Parse(s);
             }
+            else if (value!=null&&value?.GetType()?.Name=="DateOnly")
+            {
+                value = Convert.ToDateTime(DateOnlyToDateTime(value)).ToString("yyyy-MM-dd");
+            }
             return BsonValue.Create(value);
         }
         internal static MongoDB.Bson.IO.JsonWriterSettings GetJsonWriterSettings()