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Follow this StackOverflow answer:
https://stackoverflow.com/a/39349008/9191495
Summary
Override method Init of global.asax.cs
Add a handler for AcquireRequestState event.
Write a handler for AcquireRequestState event to get the route data of the request from route table.
Set a breakpoint to peak into the route data when debugging.
Model properties are all null after retrieving from POST request.
Check if they are properties instead of attributes.
Example: instead of
public String property;
Use
public String property { get; set; }
Simple, Web Api 1 doesn’t support multiple parameters.
Also, make sure the route config are correct so that the controller and action can be reached.
To bind Json parameter, use Content-Type: application/json in the request header, make sure the json object is the root object and the model to load from the server user properties instead of fields.