C# ToBase64String (Data URI Image)

Use ToBase64String to take an image and converts it to a base 64 string. Encode an image in a data URI.

ToBase64String. Any kind of binary data (like a JPG image) can be stored in a Base 64 representation. This encoding is within the range of ASCII text.

In C# programs we can use the Convert type that is found in the System namespace. We directly invoke the ToBase64String method. We can pass in a byte array.Using System Byte Array

An example. Consider this short program. We have a path to an image on the local disk (the image is named "coin.jpg" but you can change the file name and the path).

ToBase64String: This method is where the work happens. We pass in a byte array (the image data itself) and it returns a Base 64 string.

Tip: The Base 64 image data can be used in a Data Uri inside an HTML web page, or in any other text document.

C# program that converts byte array to Base64 string using System; using System.IO; class Program { static void Main() { // The path of the image. string image = @"C:\programs\coin.jpg"; // ... Read in bytes of image. byte[] data = File.ReadAllBytes(image); // ... Convert byte array to Base64 string. string result = Convert.ToBase64String(data); // ... Write Base64 string. Console.WriteLine("ENCODED: " + result); } } Output ENCODED: /9j/2wBDAAQDAwQDAwQEAwQFBAQFBgoHBgYGBg0JCggKDw0QE [Truncated]

Data URI. We can place the image directly in an HTML file with the data URI syntax. This eliminates a HTTP request when a user views the page with the image.

Here: We encode an image to base 64, and then put that encoded data into an HTML file. To body element has a background image.

Steps: Modify the file name to point to an image on your disk. Adjust the output file name. Then open the HTML file in a browser.

C# program that creates data URI image in HTML using System; using System.IO; class Program { static void Main() { // Update this path. string image = @"C:\Codex\i\2d-adventurers-map-background.jpg"; byte[] data = File.ReadAllBytes(image); // Get html string containing image. string result = @"<html><body style=""background:url(data:image/jpeg;base64," + Convert.ToBase64String(data) + @"""></body></html>"; // Write the string. File.WriteAllText(@"C:\programs\image.html", result); Console.WriteLine("[DONE]"); } } Output [DONE]

Notes, ReadAllBytes. In C# programs the easiest way to get binary data for an image (or other similar file) is to use the ReadAllBytes method. It receives a path, and returns a byte array.File.ReadAllBytes Path

A summary. The Convert.ToBase64String method is used in the creation of this website. It returns the same results as a similar method for the Go language.

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C# ToBase64String (Data URI Image)

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