Displaying image using base64 string not showing up Image

Question

I'm converting a Memory steam to a byte array and encoding it ToBase64String

   return Ok(Convert.ToBase64String(memoryStream.ToArray()));

On the client side i'm doing the following to display the image

    var response = await client.GetAsync(Navigator.BaseUri+ "upload/process");
    if (response.IsSuccessStatusCode)
    {
    imagesrc = string.Format("data:image/jpeg;base64,{0}", response.Content.ToString());
    StateHasChanged();
    }

But the image is not getting displayed, it gives the following error

Failed to load resource: net::ERR_INVALID_URL

Update: This how the image is set

<img src="@imagesrc" width="300px" height="300px" style="border: 1px solid #4f4f50; border-radius: 1px" />

You don't show what you do with imagesrc

Ralf
– Ralf

2022-11-08 11:29:10 +00:00
Commented Nov 8, 2022 at 11:29 — Ralf
– Ralf, Commented Nov 8, 2022 at 11:29

Ibrahim Timimi · Accepted Answer · 2022-11-08 13:00:52Z

2

You can use ReadAsStringAsync() which serializes the HTTP content to a string as an asynchronous operation.

var response = await client.GetAsync(Navigator.BaseUri+ "upload/process");
if (response.IsSuccessStatusCode)
{
    var base64 = await response.Content.ReadAsStringAsync();
    imagesrc = string.Format("data:image/jpeg;base64,{0}", base64);
    StateHasChanged();
}

answered Nov 8, 2022 at 13:00

Ibrahim Timimi

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4 Comments

Ibrahim Timimi Over a year ago

@HenkHolterman Yes peaking the base64 string with debugger will be enlightening indeed.

techno Over a year ago

@IbrahimTimimi I have tried response.Content.ReadAsStringAsync() but it wont work either, the same issue

techno Over a year ago

It has started to work after i replaced the client side async code imagesrc = string.Format("data:image/jpeg;base64,{0}", response.Content.ReadAsStringAsync().Result); Seems it was getting some thread input , not the data

Ibrahim Timimi Over a year ago

@techno I assumed if you use await then you will get the content instead of the task. Did you try await response.Content.ReadAsStringAsync()?

Henk Holterman · Accepted Answer · 2022-11-08 13:05:19Z

2

net::ERR_INVALID_URL means that your base64 (from response.Content.ToString()) is not valid base64.

So the error is in the code you left out. Post the full Controller and Client code. Include parameters and [Attributes].

answered Nov 8, 2022 at 13:05

Henk Holterman

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2 Comments

techno Over a year ago

The controller is doing a lot of stuff from backend.Like pulling data from azure blob container,that is why stripped that code. I can provide you with the content of the base 64 string in the client side justpaste.it/715jt

techno Over a year ago

It has started to work after i replaced the client side async code imagesrc = string.Format("data:image/jpeg;base64,{0}", response.Content.ReadAsStringAsync().Result); Seems it was getting some thread input , not the data

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