Tatsuro Shibamura 7e54196967
[csharp-netcore] Remove use of dynamic type and optimize reference (#5206)
* Change unnecessary `dynamic` to `object`

* Optimize package reference

* Fixed JsonSubTypes reference

* Update sample project

* Remove redundant method calls

* Update sample project

* Update README template
2020-02-05 10:51:48 +08:00
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