使用asp.net MVC 2显示图像的问题 [英] Problem with displaying image from DB using asp.net MVC 2

问题描述

我在从db显示图片时遇到问题。我认为保存图像的方法是工作，因为我在DB中看到varbinary字段有一些值，并且该图像类型是正确的。还有图像的大小。但是，当我想显示产品的图像我没有得到任何东西。只是空格..这是我的代码...

I'm having trouble with displaying image from db. I think that method for saving image is working, because I see in DB that varbinary fields have some value, and that image type is correct. Also the size of image. But when I want to display image for product i don't get anything. Just blank space.. here is my code...

public byte[] GetImage(int productID)
    {
        Product product = products.GetByID(productID);

        byte[] imageData = product.ImageData.ToArray();

        return imageData;
    }

代码在我的控制器中。第二个代码来自视图：

That code is in my controller. Second is code from view :

<% if (product.ImageData != null) { %>
    <img src='/product/getimage/<%= Html.Encode(product.ID) %>' alt=""/>
    <% } %>

我尝试了一些在堆栈溢出的解决方案，每个人都这样做，他们。我不知道为什么图像不显示。当我看看调试页面的源代码有：

I tried some solutions found here on stack overflow, and everyone do it like this, but it's working for them. I dont have any idea why images aren't displayed. When i look at source code of page at debugging i have :

<img src='/product/getimage/18' alt=""/>

我使用.net 4.0，MVC 2，VS 2010 ...感谢提前

I'm using .net 4.0, MVC 2, VS 2010... Thanks in advance

推荐答案

我的猜测是你有路由问题。如果url / product / getimage / 18 适用于你的操作，你需要一个看起来像这样的路由：

My guess is that you have a routing issue. If the url /product/getimage/18 should work for your action you need to have a route that looks something like this:

routes.MapRoute("ProductImage",
    "product/getimage/{productID}",
    new { controller = "Product", action = "GetImage", productID = "" }
);

要确认，您应该使用 firebug ，并检查网络标签（或在您的操作中设置断点，看看是否在加载网页时被点击）。

To confirm this you should use firebug and check the "net" tab (or set a breakpoint in your action and see if it gets hit when you load the page).

我也建议使用build在helpers生成你的urls（然后这种问题永远不会发生）。除了 src ='/ product / getimage /<％= Html.Encode（product.ID）％>'，您可以写 src = '<％= Url.Action（GetImage，Product，new {productID = product.ID}）％>'

I would also recommend using the build in helpers to generate your urls (then this kind of problem will never happen). Instead of src='/product/getimage/<%= Html.Encode(product.ID) %>' you can write src='<%=Url.Action("GetImage", "Product", new { productID = product.ID })%>'

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