c# - Post request to API is receiving NULL -


i have asp.net core api expecting post request in shape of particular object -- see code sample below.

i make sure front-end client sends data in exact shape. make sure inspecting call fiddler data being sent api.

when request hits api method though, it's null.

my first thought model binder cause of issue. meaning, somehow, data i'm sending not matching object api method expecting.

i've been staring @ code few hours , seems ok me. assuming shape of object sent front-end matches object api expecting, else causing issue?

i've been using similar code on app , working fine.

my code looks this:

[httppost("test")] public async task<iactionresult> dosomething([frombody]myobject data) {    // logic here... }

here few things i'm sure about:

  1. i'm hitting api method there no routing issues
  2. the point above confirms front-end client sending request
  3. i know front-end client sending data -- confirmed through fiddler

update:

this caused model binder. changed code myobject dynamic see happen , sure enough i'm getting data sent front-end. haven't found exact property that's causing issue yet i'm close. here's api method looks till find exact cause of issue:

[httppost("test")] public async task<iactionresult> dosomething([frombody]dynamic data) {    // logic here... }

update 2: found issue!!!!

i had guid property null valud in , model binder didn't it.

this happens when object can't deserialized json request.

the best practice make sure request properties can accept null values (make value types properties nullable). , can validate action needs provided in request , return 400 error if not.


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