[英]Increment Dictionary Value in MongoDB C# Driver
I have the following object: 我有以下对象:
[BsonId]
public ObjectId Id { get; set; }
public string Area { get; set; }
public DateTime Date { get; set; }
public int MethodCalls { get; set; }
public Dictionary<string, ActionStats> Actions { get; set; }
The ActionStats object looks like this: ActionStats对象如下所示:
public string Action { get; set; }
public int Count { get; set; }
public long TotalDuration { get; set; }
public Dictionary<int, int> Hourly { get; set; }
I want to be able to update the values in the using a FindAndModify like this: 我希望能够使用FindAndModify更新这样的值,如下所示:
Update<Statistic>.Inc(x => x.MethodCalls, 1).Inc(x => x.Actions[action.ToLower()].Count, 1);
However this fails on the second increment statement with the following stack trace: 但是,在具有以下堆栈跟踪的第二个增量语句中,这会失败:
Stack Trace -- at System.Number.StringToNumber(String str, NumberStyles options, NumberBuffer& number, NumberFormatInfo info, Boolean parseDecimal) at System.Number.ParseInt32(String s, NumberStyles style, NumberFormatInfo info) at MongoDB.Driver.Linq.Utils.BsonSerializationInfoFinder.VisitGetItem(MethodCallExpression node) at MongoDB.Driver.Linq.ExpressionVisitor
1.Visit(Expression node) at MongoDB.Driver.Linq.Utils.BsonSerializationInfoFinder.Visit(Expression node) at MongoDB.Driver.Linq.Utils.BsonSerializationInfoFinder.VisitMember(MemberExpression node) at MongoDB.Driver.Linq.ExpressionVisitor
1.Visit(Expression node) at MongoDB.Driver.Linq.Utils.BsonSerializationInfoFinder.Visit(Expression node) at MongoDB.Driver.Linq.Utils.BsonSerializationInfoFinder.VisitLambda(LambdaExpression node) at MongoDB.Driver.Linq.ExpressionVisitor1.Visit(Expression node) at MongoDB.Driver.Linq.Utils.BsonSerializationInfoFinder.Visit(Expression node) at MongoDB.Driver.Linq.Utils.BsonSerializationInfoFinder.GetSerializationInfo(Expression node, Dictionary
堆栈跟踪 - 在MongoDB.Driver.Linq.Utils的System.Number.ParseInt32(String s,NumberStyles样式,NumberFormatInfo信息)处的System.Number.StringToNumber(String str,NumberStyles options,NumberBuffer&number,NumberFormatInfo info,Boolean parseDecimal) MongoDB.Driver.Linq.ExpressionVisitor上的.BsonSerializationInfoFinder.VisitGetItem(MethodCallExpression节点)1.在MongoDB.Driver.Linq.Uins.BsonSerializationInfoFinder中的
1.Visit(Expression node) at MongoDB.Driver.Linq.Utils.BsonSerializationInfoFinder.Visit(Expression node) at MongoDB.Driver.Linq.Utils.BsonSerializationInfoFinder.VisitMember(MemberExpression node) at MongoDB.Driver.Linq.ExpressionVisitor
(表达式节点)的MongoDB.Driver.Linq.Utils.BsonSerializationInfoFinder.VisitLambda(LambdaExpression)访问(表达式节点) MongoDB.Driver.Linq.ExpressionVisitor的1.Visit(Expression node) at MongoDB.Driver.Linq.Utils.BsonSerializationInfoFinder.Visit(Expression node) at MongoDB.Driver.Linq.Utils.BsonSerializationInfoFinder.GetSerializationInfo(Expression node, Dictionary
在MongoDB.Driver.Linq.Linq.Uins.BsonSerializationInfoFi的1.Visit(Expression node) at MongoDB.Driver.Linq.Utils.BsonSerializationInfoFinder.Visit(Expression node) at MongoDB.Driver.Linq.Utils.BsonSerializationInfoFinder.GetSerializationInfo(Expression node, Dictionary
1.Visit(Expression node) at MongoDB.Driver.Linq.Utils.BsonSerializationInfoFinder.Visit(Expression node) at MongoDB.Driver.Linq.Utils.BsonSerializationInfoFinder.GetSerializationInfo(Expression node, Dictionary
2 serializationInfoCache) at MongoDB.Driver.Builders.UpdateBuilder1.Inc(Expression
1 memberExpression, Int32 value)1.Visit(Expression node) at MongoDB.Driver.Linq.Utils.BsonSerializationInfoFinder.Visit(Expression node) at MongoDB.Driver.Linq.Utils.BsonSerializationInfoFinder.GetSerializationInfo(Expression node, Dictionary
2 serializationInfoCache)1.Inc(Expression
1 memberExpression,Int32 value)
How do I go about update the dictionary values of a subdocuments? 如何更新子文档的字典值?
I doubt if the behavior is implemented because of the MongoDB Official JIRA issue CSHARP-917 . 我怀疑是否因为MongoDB官方JIRA问题CSHARP-917而实施了该行为。 However, you can always do it another way:
但是,您可以始终以另一种方式执行此操作:
Update.Inc(string.Format("Actions.{0}.Count", action.ToLower()), 1);
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