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
– Zohar Peled, Commented Jul 22, 2020 at 13:25
@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
– Panagiotis Kanavos, Commented Jul 22, 2020 at 13:28
JSON is text, not binary data. You need to deserialize or parse that text to get the data. — Panagiotis Kanavos
– Panagiotis Kanavos, Commented Jul 22, 2020 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
– Panagiotis Kanavos, Commented Jul 22, 2020 at 13:30

Alex69rus · Accepted Answer · 2020-07-22 14:07:57Z

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, 2020 at 14:07

Alex69rus

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