如何从ASP.NET MVC5中的Content文件夹加载图像？

Question

I'm having a WebAPI project (MVC5) and just put an image in Content/Images. I'd like to load this image in C# and edit some stuff on runtime:

string originalFileName = "/Content/Images/Image.png";

Bitmap bitmap = new Bitmap(originalFileName);
Graphics g = Graphics.FromImage(bitmap);

This does not work unfortunatly, I'm getting an exception: System.ArgumentException - >Parameter is not valid.

My setup (code view left, solution explorer right):

Answer 1

1. Use an Application-root-relative filename (add a ~ character): ~/content/Images/Image.png .
2. Use Server.MapPath to convert the Application-root-relative filename to an absolute filename.
3. Pass this absolute filename into the Bitmap constructor.

Like so:

String fileName = "~/Content/Images/Image.png";
fileName = Server.MapPath( fileName );
if( File.Exists( fileName ) ) {
    using( Bitmap bmp = new Bitmap( fileName ) )
    using( Graphics g = Graphics.FromImage( bmp ) ) {
        // do stuff here
    }
}