Deserialize JSON, sometimes value is an array, sometimes “” (blank string)

问题

I am trying to deserialize a field:

"presenters":[{...},{...}]

but some of the rows come back with only:

"presenters":""

When the serializer gets to the row with that empty string I get:

Error converting value "" to type 'System.Collections.Generic.List`1[DataPrototype.Model.Presenter]'.

Am I right in thinking that I need a JsonConverter that will change the empty string into an empty List?

回答1:

Yes.

Inside the JsonConverter test the token type from the JsonReader.

If it is a string then return null.

If it is the start of an array then use the JsonReader and JsonSerializer passed to the converter method to deserialize the array.

来源：https://stackoverflow.com/questions/4572732/deserialize-json-sometimes-value-is-an-array-sometimes-blank-string