如何在asp.net mvc中渲染图像？

Question

I have a sample I'm building, that's using the Northwind database. I have a view in which I show all the products for a specifc category and use a ul to generate items with an image and the products name and price.

I have used the code here, http://blogs.msdn.com/b/miah/archive/2008/11/13/extending-mvc-returning-an-image-from-a-controller-action.aspx .

And have gotten to the point that if I right-click an image on my page I get the follow for the image url.

This is the action method I provided, which just takes the Categores ID. /image/show/1

My action method in my ImageController is as follows:

    //
    // GET: /Image/Show
    public ActionResult Show(int id)
    {
        var category = northwind.AllCategories().Single(c => c.CategoryID == id);
        byte[] imageByte = category.Picture;
        string contentType = "image/jpeg";

        return this.Image(imageByte, contentType);
    }

Note: Picture is a byte[]

I then call it in my view like this. (product is the Model for my view)

But I still can't get the image to be displayed.

Answer 1

Change action

public FileContentResult Show(int id)
{
    var category = northwind.AllCategories().Single(c => c.CategoryID == id);
    byte[] imageByte = category.Picture;
    string contentType = "image/jpeg";

    return File(imageByte, contentType);
}

and send a product instance to view and try this in View

<img src="<%: Url.Action("Show","Image",new { id = Model.Category.CategoryID  }) %>" />

Answer 2

Try to use this method instead:

public FileContentResult Show(int id)
{
  var category = northwind.AllCategories().Single(c => c.CategoryID == id);  
  byte[] imageByte = category.Picture;  
  string contentType = "image/jpeg";
  return File(imageByte, contentType);
}

This should be basic approach if you don't use that extension. If this works the error is in extension if this doesn't work the error is somewhere else - probably in routing. Also check Gustav's answer!

Answer 3

我不确定这是否是您的问题，但我总是将操作和控制器名称大写：

<%= Url.Action( "Show", "Image", new { id = product.Category.CategoryID } ) %> 

Answer 4

Turns out I had to use an anoynomus type ' so that the route was /Image/Show/1, instead of /Image/Show?CategoryID=1. That and of course needed to update the images in Northwind from bitmap to Jpeg.