How to Convert a Base64 Encoded Image String to a File in C#?

Converting Base64 Encoded Images to Files

In your scenario, you aim to convert a Base64 encoded image string into an image and save it using C# code. You've provided your current code snippet, but it's configured to handle regular image URLs like "www.mysite.com/test.jpg" rather than Base64 strings.

To address this, here's an alternative approach that allows you to decode and save Base64 images:

public Image LoadImage(string base64Image)
{
    // Convert the Base64 string to a byte array
    byte[] bytes = Convert.FromBase64String(base64Image);

    Image image;
    using (MemoryStream ms = new MemoryStream(bytes))
    {
        // Decode the image from the memory stream and store it in the Image object
        image = Image.FromStream(ms);
    }

    return image;
}

protected void SaveMyImage_Click(object sender, EventArgs e)
{
    // Retrieve the Base64 image string from your input
    string base64Image = Hidden1.Value;

    // Generate an Image object from the Base64 string
    Image image = LoadImage(base64Image);

    // Specify the desired file path and name
    string saveLocation = Server.MapPath("~/PictureUploads/my_image.png");

    // Save the decoded image
    image.Save(saveLocation);
}

Here, the LoadImage method takes a Base64 encoded image string as input, converts it to a byte array, and decodes it into an Image object. The SaveMyImage_Click event handler then calls the LoadImage method to generate the Image object and save it at the specified location.

Note that this code assumes the Base64 string represents a valid image format. If the string is malformed or invalid, an exception may be thrown.

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