如何获取存储在内容文件夹.net中的图像的路径 [英] How to get the path to image stored in content folder .net

问题描述

我正在使用以下代码从Visual Studio的Content/img文件夹中获取图像:

I'm using this code to get an image from the Content/img folder in visual studio:

Image image = Image.FromFile(@"~\Content\img\toendra.JPG");

这给了我找不到文件的错误.但是，如果我给出图像的绝对路径，它将起作用:

This gives me the error that the file is not found. However if I give the absolute path to the image, it works:

Image image = Image.FromFile(@"C:\Users\Stijn\Source\Repos\groep11DotNet\p2groep11.Net\Content\img\toendra.JPG");

我的相对路径出了什么问题?

What is wrong with my relative path?

推荐答案

System.Drawing.Image.FromFile 不知道如何处理ASP.NET应用程序的根相对路径.因此，您必须使用中间函数将其转换为它可以理解的物理文件路径.

System.Drawing.Image.FromFile doesn't know how to handle an ASP.NET application root relative path. So you have to use an intermediate function to convert it to a physical file path that it can understand.

Image image = Image.FromFile(HttpContext.Current.Server.MapPath("~/Content/img/toendra.JPG"));

注意，我将您的反斜杠转换为正斜杠(这是在URL中使用的正确符号)，从而消除了对字符串文字的需求.

Notice I converted your backslashes to forward slashes (which are the correct symbols to use in a URL) and that eliminated the need for the string literal.

如果要大量使用它，可以制作一个helper实用程序类.

If you're going to use it a lot, might make a helper utility class.

public static class ImageHelper
{
    public static Image LoadFromAspNetUrl(string url)
    {
        if(HttpContext.Current == null)
        {
            throw new ApplicationException("Can't use HttpContext.Current in non-ASP.NET context");
        }
        return Image.FromFile(HttpContext.Current.Server.MapPath(url));
    }
}

用法:

Image myImage = ImageHelper.LoadFromAspNetUrl("~/Content/img/toendra.JPG");

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