从 IHttpHandler（通用处理程序）中的文件路径获取 URL

发布于 2024-11-04 04:29:04 字数 776 浏览 2 评论 0原文

在我的 IHttpHandler 类（对于 .ashx 页面）中，我想在目录中搜索某些文件，并返回相对 url。我可以获取文件，没问题：

string dirPath = context.Server.MapPath("~/mydirectory");
string[] files = Directory.GetFiles(dirPath, "*foo*.txt");
IEnumerable<string> relativeUrls = files.Select(f => WHAT GOES HERE? );

What is theiest way to conversion file paths torelative urls?如果我在 aspx 页面中，我可以说 this.ResolveUrl()。我知道我可以进行一些字符串解析和字符串替换来获取相对 URL，但是是否有一些内置方法可以为我处理所有这些问题？

编辑：为了澄清，在不进行自己的字符串解析的情况下，我如何从 this:

"E:\Webs\WebApp1\WebRoot\mydirectory\foo.txt"

转到 this:

"/mydirectory/foo.txt"

我正在寻找一个现有的方法，例如：

public string GetRelativeUrl(string filePath) { }

原文

In my IHttpHandler class (for an .ashx page), I want to search a directory for certain files, and return relative urls. I can get the files, no problem:

string dirPath = context.Server.MapPath("~/mydirectory");
string[] files = Directory.GetFiles(dirPath, "*foo*.txt");
IEnumerable<string> relativeUrls = files.Select(f => WHAT GOES HERE? );

What is the easiest way to convert file paths to relative urls? If I were in an aspx page, I could say this.ResolveUrl(). I know I could do some string parsing and string replacement to get the relative url, but is there some built-in method that will take care of all of that for me?

Edit: To clarify, without doing my own string parsing, how do I go from this:

"E:\Webs\WebApp1\WebRoot\mydirectory\foo.txt"

to this:

"/mydirectory/foo.txt"

I'm looking for an existing method like:

public string GetRelativeUrl(string filePath) { }

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白馒头 2024-11-11 04:29:05

尝试 System.Web.Hosting.HostingEnvironment.MapPath 方法，它是静态的，可以在 Web 应用程序中的任何位置访问。

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笨笨の傻瓜 2024-11-11 04:29:04

我可以想象很多人都有这个问题...我的解决方案是：

public static string ResolveRelative(string url)
{
    var requestUrl = context.Request.Url;
    string baseUrl = string.Format("{0}://{1}{2}{3}", 
        requestUrl.Scheme, requestUrl.Host, 
        (requestUrl.IsDefaultPort ? "" : ":" + requestUrl.Port), 
        context.Request.ApplicationPath);

    if (toresolve.StartsWith("~"))
    {
        return baseUrl + toresolve.Substring(1);
    }
    else
    {
        return new Uri(new Uri(baseUrl), toresolve).ToString();
    }
}

更新

或从文件名到虚拟路径（尚未测试过；您可能还需要一些类似于上面 ResoveRelative 的代码。 ..让我知道它是否有效）：

public static string GetUrl(string filename)
{
    if (filename.StartsWith(context.Request.PhysicalApplicationPath))
    {
        return context.Request.ApplicationPath +     
            filename.Substring(context.Request.PhysicalApplicationPath.Length);
    }
    else 
    {
        throw new ArgumentException("Incorrect physical path");
    }
}

I can imagine a lot of people having this question... My solution is:

public static string ResolveRelative(string url)
{
    var requestUrl = context.Request.Url;
    string baseUrl = string.Format("{0}://{1}{2}{3}", 
        requestUrl.Scheme, requestUrl.Host, 
        (requestUrl.IsDefaultPort ? "" : ":" + requestUrl.Port), 
        context.Request.ApplicationPath);

    if (toresolve.StartsWith("~"))
    {
        return baseUrl + toresolve.Substring(1);
    }
    else
    {
        return new Uri(new Uri(baseUrl), toresolve).ToString();
    }
}

update

Or from filename to virtual path (haven't tested it; you might need some code similar to ResoveRelative above as well... let me know if it works):

public static string GetUrl(string filename)
{
    if (filename.StartsWith(context.Request.PhysicalApplicationPath))
    {
        return context.Request.ApplicationPath +     
            filename.Substring(context.Request.PhysicalApplicationPath.Length);
    }
    else 
    {
        throw new ArgumentException("Incorrect physical path");
    }
}

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