c# error - Can not convert Array to byte array

Question

I am trying cast a Json data to byte array and then save it in SQL image field, code is below

public string Post([FromBody] dynamic data)
{
        foreach (var item in data)
        {
               imgPhoto1 = (byte[])item["Photo1"];
        }
 }

But getting error Can not convert Array to byte array

 byte[] imgPhoto1 = (byte[])item["Photo1"];

Values in field item["Photo1"] is look like below

 [255,216,255,224]

any help will be appreciated

You probably shouldn't be using `dynamic`... Not that it would solve this specific problem, but still. — Zohar Peled, Jul 22 '20 at 13:25
I am not fan of dynamic so i would recommend using specified model. You can use `.Cast()` from `System.Linq` on yours `item["Photo 1"]`. — Paweł Okrasa, Jul 22 '20 at 13:27
@Rakesh the question still doesn't explain what `item["Photo1"]` contains. It could be an `int[]` or `long[]`. It's definitely not a `byte[]`, which is why you get that exception — Panagiotis Kanavos, Jul 22 '20 at 13:28
check out this https://stackoverflow.com/questions/5896680/converting-an-int-to-byte-in-c-sharp — Mohammed Sajid, Jul 22 '20 at 13:28
JSON is *text*, not binary data. You need to *deserialize* or parse that text to get the data. — Panagiotis Kanavos, Jul 22 '20 at 13:29
@Rakesh I strongly suggest you edit the question, including the actual JSON **string**, and the code that lead to the error. — Panagiotis Kanavos, Jul 22 '20 at 13:30
Also, what serializer is used? And what is data? That is, what *type* it is? — mostanes, Jul 22 '20 at 13:31

score 3 · Accepted Answer · answered Jul 22 '20 at 14:07

3

If your parameter data is JToken, then you need convert it to desired type. Try to use:

var obj = item["Photo1"].ToObject<byte[]>();

And will be better explicit declare your parameter data as JToken.

answered Jul 22 '20 at 14:07

Alex69rus

46
2

c# error - Can not convert Array to byte array

1 Answers1