4.12Adding Base64 string file content

Created on Aug 17, 2026~1 min read

Add file content from a Base64 string to multipart form content.

cs
HttpRequestBuilder.Post("https://furion.net")    .SetMultipartContent(multipart =>    {        multipart.AddFileFromBase64String("77u/5rWL6K+V5paH5Lu25YaF5a65", "file", "test.txt");        multipart.AddFileFromBase64String("77u/5rWL6K+V5paH5Lu25YaF5a65", "file", "test.txt", "text/plain");    // Custom media type; if Content-Type is not passed, it will be resolved automatically based on the file extension    });

Note: When adding a file from a Base64 string, the file size is limited to 100MB.