Question

我有一个Mongo C＃实现，它将日期时间存储为UTC。

MongoDB.Bson.Serialization.Options.DateTimeSerializationOptions options = 
    MongoDB.Bson.Serialization.Options.DateTimeSerializationOptions.UtcInstance;

var serializer = 
    new MongoDB.Bson.Serialization.Serializers.DateTimeSerializer(options);

MongoDB.Bson.Serialization.BsonSerializer.RegisterSerializer(
    typeof(DateTime),
    serializer);

我还需要将用户本地时区与UTC一起存储。为了解释，我有两个属性，如

DateTime WorkItemToCompleteBy{get; set;}
[BsonDateTimeOptions(Kind = DateTimeKind.Unspecified)]
DateTime WorkItemToCompleteByLocal{get; set;}

我想将澳大利亚/美国/印度/其他时间存储在本地属性中，并将相应的UTC值存储在另一个属性中。由于处理了几十个时区，我有代码将UTC转换为所需的时区并将其存储在WorkItemToCompleteByLocal属性中。我希望Mongo将这个值“按原样”存储并将其返回给我。问题是Mongo总是将它存储为ISODate并将值转换为Utc版本。解释。如果UTC是0730小时，我将布里斯班时间计算为1730小时并将其设置为WorkitemToCompleteByLocal，他们被保存为

"WorkItemToCompleteBy" : ISODate("2013-06-05T07:30:00Z"),
"WorkItemToCompleteByLocal" : ISODate("2013-06-05T12:00:00Z"),

Mongo将提供的时间解释为本地，服务器位于印度并将其转换为1200小时的等效UTC。虽然它将值恢复为1730（IST虽然）但是它违背了我的目的并阻止我在Mongo上运行任何基于本地时间的查询。没有想法。感谢任何帮助以帮助存储WorkItemToCompleteByLocal日期'原样'而不进行修改

Answer 1

这是我强制MongoDB存储原始值的方法，并忽略DateTime对象中的DateTimeKind属性。

这可能不适用于您的业务逻辑，但出于特殊原因对我们有意义。

BsonSerializer.RegisterSerializer(typeof(DateTime), new MyMongoDBDateTimeSerializer());


public class MyMongoDBDateTimeSerializer : DateTimeSerializer
{
    //  MongoDB returns datetime as DateTimeKind.Utc, which cann't be used in our timezone conversion logic
    //  We overwrite it to be DateTimeKind.Unspecified
    public override object Deserialize(MongoDB.Bson.IO.BsonReader bsonReader, System.Type nominalType, MongoDB.Bson.Serialization.IBsonSerializationOptions options)
    {
        var obj = base.Deserialize(bsonReader, nominalType, options);
        var dt = (DateTime) obj;
        return new DateTime(dt.Ticks, DateTimeKind.Unspecified);
    }

    //  MongoDB returns datetime as DateTimeKind.Utc, which cann't be used in our timezone conversion logic
    //  We overwrite it to be DateTimeKind.Unspecified
    public override object Deserialize(MongoDB.Bson.IO.BsonReader bsonReader, Type nominalType, Type actualType, MongoDB.Bson.Serialization.IBsonSerializationOptions options)
    {
        var obj = base.Deserialize(bsonReader, nominalType, actualType, options);
        var dt = (DateTime)obj;
        return new DateTime(dt.Ticks, DateTimeKind.Unspecified);
    }

    //  MongoDB stores all datetime as Utc, any datetime value DateTimeKind is not DateTimeKind.Utc, will be converted to Utc first
    //  We overwrite it to be DateTimeKind.Utc, becasue we want to preserve the raw value
    public override void Serialize(MongoDB.Bson.IO.BsonWriter bsonWriter, System.Type nominalType, object value, MongoDB.Bson.Serialization.IBsonSerializationOptions options)
    {
        var dt = (DateTime) value;
        var utcValue = new DateTime(dt.Ticks, DateTimeKind.Utc);
        base.Serialize(bsonWriter, nominalType, utcValue, options);
    }
}

Answer 2

新版C＃driver =＆gt;

    public class MyMongoDBDateTimeSerializer : DateTimeSerializer
{
    //  MongoDB returns datetime as DateTimeKind.Utc, which cann't be used in our timezone conversion logic
    //  We overwrite it to be DateTimeKind.Unspecified
    public override DateTime Deserialize(BsonDeserializationContext context, BsonDeserializationArgs args)
    {
        var obj = base.Deserialize(context, args);
        return new DateTime(obj.Ticks, DateTimeKind.Unspecified);
    }

    //  MongoDB stores all datetime as Utc, any datetime value DateTimeKind is not DateTimeKind.Utc, will be converted to Utc first
    //  We overwrite it to be DateTimeKind.Utc, becasue we want to preserve the raw value
    public override void Serialize(BsonSerializationContext context, BsonSerializationArgs args, DateTime value)
    {
        var utcValue = new DateTime(value.Ticks, DateTimeKind.Utc);
        base.Serialize(context, args, utcValue);
    }
}

Answer 3

在.net驱动程序版本2.4中，使用：

using MongoDB.Bson.Serialization;
using MongoDB.Bson.Serialization.Serializers;

BsonSerializer.RegisterSerializer(DateTimeSerializer.LocalInstance);

这样，datetime值将以db中的kind = utc存储，但以本地方式反序列化。

在Mongo中存储Utc和本地日期时间

3 个答案: