结合相对基本URI使用相对路径 [英] Combine relative baseUri with relative path
问题描述
我在找一个干净的方式相对基准URI与另一个相对路径结合起来。我试过以下,但乌里(乌里,字符串)
和 UriBuilder(URI)
需要绝对URI(投掷InvalidOperationException异常:此操作不支持相对URI)
I'm looking for a clean way to combine a relative base Uri with another relative path. I've tried the following, but Uri(Uri, string)
and UriBuilder(Uri)
require absolute Uris (throwing InvalidOperationException: This operation is not supported for a relative URI).
// where Settings.Default.ImagesPath is "~/path/to/images"
// attempt 1
_imagePath = new Uri(Settings.Default.ImagesPath, image);
// attempt 2
UriBuilder uriBuilder = new UriBuilder(Settings.Default.ImagesPath);
uriBuilder.Path += image;
_imagePath = uriBuilder.Uri;
我不想做任何丑陋的字符串操作,以确保基本路径以斜线等结束。
I don't want to do any ugly string manipulation to make sure the base path ends with a trailing slash, etc.
推荐答案
这仍然是一个有点混乱,比我想的,但它的工作原理。
This is still a bit messier than I'd like, but it works.
public static class UriExtensions
{
public static Uri Combine(this Uri relativeBaseUri, Uri relativeUri)
{
if (relativeBaseUri == null)
{
throw new ArgumentNullException("relativeBaseUri");
}
if (relativeUri == null)
{
throw new ArgumentNullException("relativeUri");
}
string baseUrl = VirtualPathUtility.AppendTrailingSlash(relativeBaseUri.ToString());
string combinedUrl = VirtualPathUtility.Combine(baseUrl, relativeUri.ToString());
return new Uri(combinedUrl, UriKind.Relative);
}
}
下面是一个例子用法:
Uri imageUrl = new Uri("profile.jpg", UriKind.Relative);
Uri baseImageUrl = new Uri("~/path/to/images", UriKind.Relative);
Uri combinedImageUrl = baseImageUrl.Combine(image);
该combinedImageUrl是
〜/路径/到/图像/ profile.jpg
The combinedImageUrl is ~/path/to/images/profile.jpg
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