MVC(Stack Exchange Beta站点)中的动态图像

是的,有一种使用ASP.NET MVC动态生成和提供图像的方法。举个例子:

public class HomeController : Controller
{
    public ActionResult MyImage()
    {
        // Load an existing image
        using (var img = Image.FromFile(Server.MapPath("~/test.png")))
        using (var g = Graphics.FromImage(img))
        {
            // Use the Graphics object to modify it
            g.DrawLine(new Pen(Color.Red), new Point(0, 0), new Point(50, 50));
            g.DrawString("Hello World", 
                new Font(FontFamily.GenericSerif, 20), 
                new Pen(Color.Red, 2).Brush, 
                new PointF(10, 10)
            );

            // Write the resulting image to the response stream
            using (var stream = new MemoryStream())
            {
                img.Save(stream, ImageFormat.Png);
                return File(stream.ToArray(), "image/png");
            }
        }
    }
}

然后只需在视图中包含此图像:

<img src="<%= Url.Action("myimage", "home") %>" alt="my image" />

using System.Web.Helpers;
public class HomeController : Controller
{
    public FileContentResult ImageOutput()
    {

         WebImage img = new WebImage("C:\\temp\\blank.jpg"));

         //Do whatever you want with the image using the WebImage class

         return new FileContentResult(img.GetBytes(), string.Format("image/{0}",img.ImageFormat));
    }
}

<img src="<%= Url.Action("ImageOutput", "home") %>" alt="my image" />