diff --git a/Src/Asp.NetCore2/MongoDbTest/UnitTest/QuerySelect.cs b/Src/Asp.NetCore2/MongoDbTest/UnitTest/QuerySelect.cs
index a1be45340..1bbd33aff 100644
--- a/Src/Asp.NetCore2/MongoDbTest/UnitTest/QuerySelect.cs
+++ b/Src/Asp.NetCore2/MongoDbTest/UnitTest/QuerySelect.cs
@@ -18,7 +18,7 @@ namespace MongoDbTest
             db.CodeFirst.InitTables<Student>();
             db.DbMaintenance.TruncateTable<Student>();
             var dt = DateTime.Now;
-            var studentId = db.Insertable(new Student() { CreateDateTime=dt, Name="a", SchoolId="aa" })
+            var studentId = db.Insertable(new Student() { CreateDateTime=dt,Age=11, Name="a", SchoolId="aa" })
                .ExecuteCommand(); 
             var list=db.Queryable<Student>().Select(it => new
             {
@@ -42,6 +42,10 @@ namespace MongoDbTest
                 date = it.CreateDateTime.ToString("yyyy-MM-dd")
             }).ToList();
             if(list2.First().date!=dt.ToString("yyyy-MM-dd")) Cases.ThrowUnitError();
+            var list3 = db.Queryable<Student>().Select(it => new
+            {
+                date = it.Age.ToString()
+            }).ToList();
         }
         [SqlSugar.SugarTable("UnitStudent1231sds3z1")]
         public class Student : MongoDbBase
@@ -50,6 +54,8 @@ namespace MongoDbTest
 
             public string SchoolId { get; set; }
 
+            public int Age { get; set; }
+
             public DateTime CreateDateTime { get; set; }
         } 
     }
diff --git a/Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbExpressionContext.cs b/Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbExpressionContext.cs
index 1da86e449..484049dc5 100644
--- a/Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbExpressionContext.cs
+++ b/Src/Asp.NetCore2/SqlSugar.MongoDbCore/MongoDb/SqlBuilder/MongoDbExpressionContext.cs
@@ -158,6 +158,63 @@ namespace SqlSugar.MongoDb
     public class MongoDbMethod : DefaultDbMethod, IDbMethods
     {
         public MongoNestedTranslatorContext  context { get; set; }
+        public override string ToInt32(MethodCallExpressionModel model)
+        {
+            var item = model.DataObject as Expression;
+            BsonValue memberName = new ExpressionVisitor(context).Visit(item as Expression);
+            var toIntDoc = new BsonDocument("$toInt", $"${memberName}");
+            return toIntDoc.ToJson(UtilMethods.GetJsonWriterSettings());
+        }
+
+        public override string ToInt64(MethodCallExpressionModel model)
+        {
+            var item = model.DataObject as Expression;
+            BsonValue memberName = new ExpressionVisitor(context).Visit(item as Expression);
+            var toLongDoc = new BsonDocument("$toLong", $"${memberName}");
+            return toLongDoc.ToJson(UtilMethods.GetJsonWriterSettings());
+        }
+
+        public override string ToGuid(MethodCallExpressionModel model)
+        {
+            var item = model.DataObject as Expression;
+            BsonValue memberName = new ExpressionVisitor(context).Visit(item as Expression);
+            // MongoDB 没有直接的 Guid 类型，通常以字符串存储
+            var toStringDoc = new BsonDocument("$toString", $"${memberName}");
+            return toStringDoc.ToJson(UtilMethods.GetJsonWriterSettings());
+        }
+
+        public override string ToDouble(MethodCallExpressionModel model)
+        {
+            var item = model.DataObject as Expression;
+            BsonValue memberName = new ExpressionVisitor(context).Visit(item as Expression);
+            var toDoubleDoc = new BsonDocument("$toDouble", $"${memberName}");
+            return toDoubleDoc.ToJson(UtilMethods.GetJsonWriterSettings());
+        }
+
+        public override string ToBool(MethodCallExpressionModel model)
+        {
+            var item = model.DataObject as Expression;
+            BsonValue memberName = new ExpressionVisitor(context).Visit(item as Expression);
+            var toBoolDoc = new BsonDocument("$toBool", $"${memberName}");
+            return toBoolDoc.ToJson(UtilMethods.GetJsonWriterSettings());
+        }
+
+        public override string ToDate(MethodCallExpressionModel model)
+        {
+            var item = model.DataObject as Expression;
+            BsonValue memberName = new ExpressionVisitor(context).Visit(item as Expression);
+            var toDateDoc = new BsonDocument("$toDate", $"${memberName}");
+            return toDateDoc.ToJson(UtilMethods.GetJsonWriterSettings());
+        }
+
+        public override string ToTime(MethodCallExpressionModel model)
+        {
+            var item = model.DataObject as Expression;
+            BsonValue memberName = new ExpressionVisitor(context).Visit(item as Expression);
+            // MongoDB 没有单独的 Time 类型，通常用字符串或日期处理
+            var toStringDoc = new BsonDocument("$toString", $"${memberName}");
+            return toStringDoc.ToJson(UtilMethods.GetJsonWriterSettings());
+        }
         public override string AggregateCount(MethodCallExpressionModel model)
         {
             var index = context.queryBuilder.LambdaExpressions.Index;