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.


Comments

Post a Comment

Popular posts from this blog

angular - Ionic slides - dynamically add slides before and after -

hi i'm using ngfor create set of 3 slides while starting in middle i'm guaranteed able slide left or right on start. when slide right can simple listen reachedend , push slide array i'm looping. but have problem adding slide beginning. if same above , use e.g. array.unshift() or spread add item beginning, view think it's on position 0 , snaps view new slide. the code below work animates slide change index 1. slide = [0,1,2] //example loop slidechanged(event) { if(this.slides.isbeginning()){ this.slide = [this.slide[0]-1, ...this.slide]; this.slides.update(); this.slides.slideto(1) } } <ion-slides [initialslide]="1" (ionslidedidchange)="slidechanged($event)"> <ion-slide *ngfor="let item of slide"> <h1>slide {{item}}</h1> </ion-slide> </ion-slides> any appreciated! you can using ionslidenextend , ionslideprevend events slides . please...
Read more

Add a dynamic header in angular 2 http provider -

i have http interceptor built via tutorial https://scotch.io/@kashyapmukkamala/using-http-interceptor-with-angular2 the problem need have dynamic header changes automatically once changes 'mode' in app. service able tell interceptor change header, or have interceptor pull header (which string)from service each request. able throwing away patch method, call http.patch('new header string') set header string. call in service controls 'mode' setting. wondering if there way interceptor pull recent value service each request or if can add method http provider via interceptor? i've tried call service in interceptor each request returns undefined. because creating new instance of service or copying value before service fired , loaded/changed data. i don't want pass header string every http provider call because defeats purpose of having interceptor, id able set once changes or have provider fetch service before makes request. tl;dr : need add autom...
Read more

minify - Minimizing css files -

i want know how css files can minimized. currently, using external sites css minifier compress css files. however, after removing whitespaces, comments, etc, file sizes reduced 10-15%. how frameworks bootstrap manage make minimized versions kilobytes. as example, css is: body { background-color: #ff0; } the reduction goes 28 bytes 22 bytes other css files have lot more characters still smaller this. actually minifying code means it's remove thing code white space characters new line characters comments block delimiters it reduces amount of code has transferred on web , speed site load fastly.but unreadable format.
Read more