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Type:
Bug
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Resolution: Gone away
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Priority:
Unknown
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None
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Affects Version/s: 2.19.0
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Component/s: Serialization
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Labels:None
Prerequisite
I have the following document:
{
"State": {
"Date": null,
"Time": null,
"Filters": {
"_t": "System.Collections.Generic.List`1[[JobManager.Common.TimeFilter, JobManager.Common]]",
"_v": [
{
"Type": 2,
"Values": [
6
],
"Mode": 1
}
]
}
}
}
*irrelevant parts omitted
Mapped to the following c# Type
public class ObjectDescriptor { public string? Id { get; set; } public string? TypeName { get; set; } public ObjectState? State { get; set; } }
where ObjectState
public class ObjectState : Dictionary<string, object?>
The actual instance of the dictionary contains a key called Filters ,
with a value of type List<TimeFilter>
The class TimeFilter
public class TimeFilter { public TimeFilterType Type { get; set; } //Enum public IList<int>? Values { get; set; } public TimeFilterMode Mode { get; set; } //Enum }
Problem
The method GetActualType in class TypeNameDiscriminator calls {{TryParseGenericTypeName }}passing the following typeName:
System.Collections.Generic.List`1[[JobManager.Common.TimeFilter, JobManager.Common]]
At first call, returns as typeArgumentNames the following string:
[JobManager.Common.TimeFilter, JobManager.Common]
The subsequential recursive call to GetActualType with that argument as typeName,
results in a wrong match in TryParseGenericTypeName (wrongly parsed as generic),
returning an empty string ("") in typeArgumentNames
The empty string causes an exception when is called:
Type.GetType(typeName);
The exception is:
String cannot have zero length
Framework: .NET 7.0.200-preview.22628.1
MongoDB.Driver: 2.19.0