How to Fix Image Not Displaying with Base64 Encoding in Blazor

Learn how to properly display images using `Base64` encoding in your Blazor applications, solving common issues related to image rendering.
---

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Displaying image using base64 string not showing up Image

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Fix Image Not Displaying with Base64 Encoding in Blazor

When working with image files in web applications, you might sometimes encounter issues when rendering images directly from Base64 strings. This can be especially problematic in Blazor applications where users want to show images uploaded or processed on the server. If you’ve tried to display an image using Base64 encoding and faced errors, you are not alone. In this guide, we will explore the problem and provide a simple solution to ensure your images display correctly in Blazor applications.

The Problem

Consider the following scenario: you are converting a memory stream to a byte array and encoding it to a Base64 string. You may have attempted to send this string to the client and render it as an image using HTML. However, instead of seeing the desired image, you encounter an error message that reads, "Failed to load resource: net::ERR_INVALID_URL".

Sample Code Snippet

Here’s a brief look at how the code might be structured in such a case:

[[See Video to Reveal this Text or Code Snippet]]

On the client side, you might try something like this to display the image:

[[See Video to Reveal this Text or Code Snippet]]

As we can see, although you successfully get a response, the image does not show up.

The Solution

The issue lies in how you're attempting to retrieve and utilize the content of your response. Instead of using response.Content.ToString(), which does not give you the correct Base64 string, you want to read the content as a string directly and then format it correctly. Here’s how you can do it effectively:

Step by Step Instructions

Use ReadAsStringAsync() Method: This method reads the response content as a string in an asynchronous manner, ensuring that you get the correct string representation of your image data.

Update Your Code: Modify your code to include this method. Here’s the updated version of your client-side code:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Changes

Async Read: ReadAsStringAsync() fetches the Base64 string directly from the content, giving you access to the actual image data you need.

Image Source Formatting: The formatting remains standard, allowing the image to be rendered directly in the src attribute of your <img> tag.

Render the Image

To render the image on your page, ensure you’re doing it correctly like so:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

Displaying images via Base64 in Blazor should be straightforward if approached correctly. By reading your response content as a string using ReadAsStringAsync(), you can eliminate the common pitfalls that lead to errors like "Failed to load resource: net::ERR_INVALID_URL." Following the steps outlined in this post will help you to successfully display your images without issues.

Now, you can enhance your Blazor applications with correctly displayed images, leading to a better user experience. Happy coding!