![]() When the image is a File object or Blob we can use the FileReader API please see this article on converting a file to base64 string or dataURL. const getBase64StringFromDataURL = ( dataURL ) =>ĭataURL. We’ll be converting images to DataURLs, we can use the function below to convert a DataURL to a Base64 string. In all examples below we assume we already have a, , File, or Blob object available. We look at converting a File object or Blob, a canvas element, and an image tag. We also shown alternative approaches for UWP using async.In this short tutorial we explore 3 different JavaScript methods to convert an image into a Base64 string. We have shown how to decode a Base64 image and display it in a Xamarin.Forms app. Source code for this article is available on my GitHub. Using (MemoryStream stream = new MemoryStream(byteArray))Īwait bitmap.SetSourceAsync(stream.AsRandomAccessStream()) īoth solutions work equally well, but utilize async/await and SetSourceAsync which is the recommended approach in UWP. Public async Task Base64StringToBitmapSimplerAsync(string source) Var dataWriter = new DataWriter(inMemoryStream) īitmapImage.SetSourceAsync(inMemoryStream) Var byteArray = Convert.FromBase64String(source) Var inMemoryStream = new InMemoryRandomAccessStream() If you are building a UWP app, you have two alternative options for creating a BitmapImage from Base64 string: public async Task Base64StringToBitmapLongerAsync(string source) Var imageSource = ImageSource.FromStream(()=>stream) Īnd that’s it! The image should now display and it works across all platforms. Stream stream = new MemoryStream(byteArray) We can create it from a Stream and as we have the byte array in memory, a MemoryStream is the natural best fit. To be able to display an image, we need an instance of. var byteArray = Convert.FromBase64String(source) Displaying the image We will use the FromBase64String method which you supply a Base64 encoded string and you will get a byte array in return. There are four methods dealing with Base64: When it comes to converting “anything to anything”, the System.Convert class is usually the best start. If you want to get its Base64 version, you can download it as part of the sample source code on GitHub. Sample imageĪs a sample image I have used a PNG version of the Xamarin logo. NET so in this article we will try to decode a image and display it in a Xamarin.Forms app. Base64 encoding is quite often used to store binary data as strings, including images on the web. ![]()
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