Validate Json String against Model asp.net core api

Question

I need to send Model data along with Image so I am using FormData. As we can't pass model directly, I am using JSON.stringify.

How do I validate this Json string against Model (Same as we do ModelState validation)?

Why dont you send the image as blob, and add it to the model so that it gets validated during the ModelState validation? — Hozikimaru
– Hozikimaru, Commented Jan 30, 2019 at 6:29
@Hozikimaru Is it a better option than FormData for large images also? — Jeeten Parmar
– Jeeten Parmar, Commented Jan 30, 2019 at 17:25

Zavi · Accepted Answer · 2019-01-30 12:44:32Z

3

yes you need to extract the model from the form data first e.g.

var request = HttpContext.Current.Request;
var model = new yourViewModel();
model.field1 = request.Form["field1"];
model.field2 = request.Form["field2"];
model.Document = request.Files["Document"];

ModelState.Clear(); 
this.Validate(model); 
if (ModelState.IsValid) {

}

2 Comments

Jeeten Parmar Over a year ago

Thanks. It worked. I am not sure if I can use ActionFilterAttribute in this scenario.

Usama Kiyani Over a year ago

i guess you can check this [post stackoverflow.com/questions/10673649/…

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