How to Encode Strings to Base64 URL-Safe in C#?

Base64 URL security encoding in the c# detailed explanation

Base64 URL security encoding is a commonly used URL encoding technology, which avoids the need for the character's %-encoding. This article will explore how to implement this encoding in C#.

JavaScript method comparison

Java can easily implement URL security coding using the CODEC library. C# can also adopt a similar method.

Base64 conversion

The following code demonstration how to convert the string to base64:

However, this method will add a double -class number to the end of the coding result (=).

<code class="language-csharp">byte[] toEncodeAsBytes = System.Text.ASCIIEncoding.ASCII.GetBytes("StringToEncode");
string returnValue = System.Convert.ToBase64String(toEncodeAsBytes);</code>

Implement URL security coding

In order to achieve URL security coding, we need to perform the following steps:

Replace the character:

replace the '' to '-', and replace '/' to '_'.

Remove filling:
1. Delete any filling character '='.
The following code has been implemented:
2. Please note that is defined as an array containing '=' characters.

Decoding process

<code class="language-csharp">char[] padding = { '=' };
string returnValue = System.Convert.ToBase64String(toEncodeAsBytes)
        .TrimEnd(padding).Replace('+', '-').Replace('/', '_');</code>

The decoding process is as follows:

padding

Compared with the Java Codec library

You need to further verify whether this method is consistent with Java's "Common Codec Library" method. This will be an interesting test direction.

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