Display binary data as image c#
This field in the database is a perfect fit for storing binary files and images. Occassionally, in an ASP. NET web application, a task may involve the user uploading a file, which is stored in the database for analysis or retrieval at a later time. One important note is that you can not save image data with a plain text SQL statement. Here is an example:. Utilizing the above method to store a picture in the database in an ASP. NET web application is a bit more tricky. We have to create a web form with a file input control, which allows the user to browse for a file to upload, and then access the stream.
In the code-behind file within your C. NET application, you would have the following when the user clicks Submit:. The only way to view the image bytes is to retrieve the display binary data as image c# stream by reading the byte array from the table. It is easy to do this simply by casting the datareader to byte as follows: In the above example, the last command calls Response.
BinaryWrite to display the picture in a web browser. This is the method display binary data as image c# in a C web application to retrieve pictures from a database display binary data as image c# display them in the web page. It is actually a bit more complicated than this because of the way web browsers work. To correctly load an image from a database and display it in a web application, you must have the web application call another page to actually retrieve the image data within an asp: You must then create the loadpicture.
This way, in the asp: The code to read from the database is shown above. While storing images in the database may be more complex than storing a relative or absolute path to the image, there are pros and cons to both methods. By storing the image as binary data, the entire database can be backed up without worrying about broken links, missing files, or even filenames.
It display binary data as image c# also easy to manipulate the image via its byte stream. On the other hand, storing images as binary data has the possibility of slowing down search queries in the database.
It may also cause the table to grow much larger than it would normally. Therefore, if you are working with a. NET web application which deals with hundreds of thousands of records, you may want to consider simply saving the image path in the database, rather than its binary content.
Working with images in a C. NET web application is a highly useful and powerful feature. This article was written by Kory Beckersoftware display binary data as image c# and architect, skilled in a range of technologies, including web application development, machine learning, artificial intelligence, and data science.
Displaying images from wellknown URLs is quite straightforward. At times, however, you need to display images that are available as raw binary data. These images won't reside on the server as physical files.
They will be generated and held in memory using System. Drawing classes or something similar. There can be multiple ways to deal with this problem. This article discusses a couple of them. The first approach that I discuss involves sending a Base64 display binary data as image c# of the image through ViewBag.
The action method under consideration generates such a Base64 version of the image often called Data URL and then pass it to the view via a ViewBag property.
Here is how this is done:. The above code shows Index action method of HomeController. For the sake of simplicity it uses a physical image file rather than dynamically generated image.
The display binary data as image c# file is read as a byte array using ReadAllBytes method. In a more realistic situation you will replace the first two lines with the image generation logic of your own. Once the image content is read as a byte array, it is converted into a Base64 string using ToBase64String method of Convert class. This Base64 string is used to form a data URL as shown. Notice how the data URL has data: This way the browser knows that the src attribute value itself contains the image data.
Make sure to change the image type. Let's see another technique to achieve the same result. This technique calls for creation of another action method. Here is how this approach works:. Here, the GetImage action method reads the image file into a byte array.
It then uses File method of the Controller base class to send the contents to the caller. The first parameter is a byte array that represents the file content and the second parameter indicates the MIME content type. Make sure to change the content type as per your needs. If you run the display binary data as image c# the result would be the same as in earlier case. Registration open for May batches of ASP. NET Core and Angular instructor-led online courses.
Conducted by Bipin Joshi on weekends. Click here for display binary data as image c# details. Display image from byte array in ASP. Here is how this is done: The Index view makes use of this ViewBag property as shown below: Here is how this approach works: To use the GetImage action method you will write this markup in the view: He also conducts online courses on ASP. He is a published author and has authored or co-authored books for Apress and Wrox press.
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