How to Display Byte Array Images in ASP.NET MVC Without Database Access?

Efficiently Displaying Byte Array Images in ASP.NET MVC without Database Access

Many ASP.NET MVC applications store images as byte arrays within their models. However, repeatedly accessing the database to retrieve these images impacts performance. This article presents a solution to display byte array images directly from the model, bypassing the database for improved efficiency.

The key is to leverage .NET's built-in capabilities to convert the byte array into a Base64 string. This string then becomes the source for an HTML <img src="/static/imghwm/default1.png" data-src="@imgSrc" class="lazy" alt="How to Display Byte Array Images in ASP.NET MVC Without Database Access?" > tag, directly rendering the image on the webpage.

Here's the process:

1. Base64 Conversion: Use Convert.ToBase64String() to transform the byte array into a Base64 encoded string.
2. Data URI Formatting: Construct a data URI string using the Base64 string and the image's MIME type (e.g., "data:image/jpeg;base64,").
3. HTML Image Element: Embed the formatted data URI as the src attribute of an <img src="/static/imghwm/default1.png" data-src="@imgSrc" class="lazy" alt="How to Display Byte Array Images in ASP.NET MVC Without Database Access?" > tag.

This code snippet illustrates the implementation:

@{
    var base64 = Convert.ToBase64String(Model.ByteArray);
    var imgSrc = $"data:image/{Model.ImageType};base64,{base64}"; //Improved using string interpolation and dynamic image type
}

<img src="/static/imghwm/default1.png"  data-src="@imgSrc"  class="lazy" alt="Image from byte array" />

This optimized approach avoids repeated database calls, resulting in faster image loading and improved overall application performance. Note the addition of alt attribute for accessibility. The example also uses string interpolation for cleaner code and assumes your model includes an ImageType property (e.g., "jpeg", "png", "gif") to dynamically determine the MIME type.

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