In this article, we will learn how to Save a base64 string as an image into a folder on the server using C# and Web API.I’m working on Mobile App and I got a requirement to upload images by Andriod App So that I decided to take the image as Base64 from the API and Save it to the server folder. After completing it my task, I decided to share code.

Now Let’s Start

• Create an Empty WebApi
• Create an API controller.
• Create a folder where we need to save the Images.

Now Copy Paste The Below

using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web;
using System.Web.Http;
using System.Web.Http.Results;

namespace DemoWebApi.Controllers
{
    public class ImageModel
    {
        public string base64Image { get; set; }
        public string imagename { get; set; }
    }
    public class FileUploadController : ApiController
    {
        // POST: api/FileUpload
        public JsonResult<object> Post([FromBody]ImageModel Image)
        {
            try
            {
                string ImgName = Image.imagename;
                if (!string.IsNullOrEmpty(Image.base64Image))
                {
                    //Image image = Base64ToImage(Image.base64Image);
                    String path = HttpContext.Current.Server.MapPath("~/Filestorage"); //Path
                    //Check if directory exist
                    if (!System.IO.Directory.Exists(path))
                    {
                        System.IO.Directory.CreateDirectory(path);
                        //If directory doesn't exist then Create it 
                    }
                    string imageName = ImgName + ".jpg";
                    //set the image path
                    string imgPath = Path.Combine(path, imageName);
                    if (Image.base64Image.Contains("data:image"))
                    {
                        //Need To remove some header information at the beginning if image data contains
                        //ImageDataUrl = "data:image/jpeg;base64,/9j/4AAQSkZJRgABAQAAAQABAAD....";
                        //Otherwise, this will give an error.
                        //Remove everything in front of the DataUrl and including the first comma.
                        //ImageDataUrl = "9j/4AAQSkZJRgABAQAAAQABAAD...
                        Image.base64Image = Image.base64Image.Substring(Image.base64Image.LastIndexOf(',') + 1);
                        // removing extra header information 
                    }
                    byte[] imageBytes = Convert.FromBase64String(Image.base64Image);
                    MemoryStream ms = new MemoryStream(imageBytes, 0, imageBytes.Length);
                    ms.Write(imageBytes, 0, imageBytes.Length);
                    System.Drawing.Image image = System.Drawing.Image.FromStream(ms, true);
                    image.Save(imgPath, System.Drawing.Imaging.ImageFormat.Jpeg);
                    return Json((object)new
                    {
                        status = "Success",
                    });
                }
                return Json((object)new
                {
                    status = "Content not found",
                });
            }
            catch(Exception ex)
            {
                return Json((object)new
                {
                    Status = false,
                    Message = "Something went wrong with wrong.Please try after some time",
                });
            }
           
        }
    }
}

Now Let’s do testing above code is working or not. Open Postman and Hit the API.

Let’s Check server folder,you will able to see your image