Path.Combine很方便,但是.NET框架中是否有类似的URL函数?
我正在寻找这样的语法:
Url.Combine("http://MyUrl.com/", "/Images/Image.jpg")
这将返回:
"http://MyUrl.com/Images/Image.jpg"
Path.Combine很方便,但是.NET框架中是否有类似的URL函数?
我正在寻找这样的语法:
Url.Combine("http://MyUrl.com/", "/Images/Image.jpg")
这将返回:
"http://MyUrl.com/Images/Image.jpg"
当前回答
我只是拼凑了一个小的扩展方法:
public static string UriCombine (this string val, string append)
{
if (String.IsNullOrEmpty(val)) return append;
if (String.IsNullOrEmpty(append)) return val;
return val.TrimEnd('/') + "/" + append.TrimStart('/');
}
它可以这样使用:
"www.example.com/".UriCombine("/images").UriCombine("first.jpeg");
其他回答
如果您不想拥有像Flurl这样的依赖项,可以使用它的源代码:
/// <summary>
/// Basically a Path.Combine for URLs. Ensures exactly one '/' separates each segment,
/// and exactly on '&' separates each query parameter.
/// URL-encodes illegal characters but not reserved characters.
/// </summary>
/// <param name="parts">URL parts to combine.</param>
public static string Combine(params string[] parts) {
if (parts == null)
throw new ArgumentNullException(nameof(parts));
string result = "";
bool inQuery = false, inFragment = false;
string CombineEnsureSingleSeparator(string a, string b, char separator) {
if (string.IsNullOrEmpty(a)) return b;
if (string.IsNullOrEmpty(b)) return a;
return a.TrimEnd(separator) + separator + b.TrimStart(separator);
}
foreach (var part in parts) {
if (string.IsNullOrEmpty(part))
continue;
if (result.EndsWith("?") || part.StartsWith("?"))
result = CombineEnsureSingleSeparator(result, part, '?');
else if (result.EndsWith("#") || part.StartsWith("#"))
result = CombineEnsureSingleSeparator(result, part, '#');
else if (inFragment)
result += part;
else if (inQuery)
result = CombineEnsureSingleSeparator(result, part, '&');
else
result = CombineEnsureSingleSeparator(result, part, '/');
if (part.Contains("#")) {
inQuery = false;
inFragment = true;
}
else if (!inFragment && part.Contains("?")) {
inQuery = true;
}
}
return EncodeIllegalCharacters(result);
}
/// <summary>
/// URL-encodes characters in a string that are neither reserved nor unreserved. Avoids encoding reserved characters such as '/' and '?'. Avoids encoding '%' if it begins a %-hex-hex sequence (i.e. avoids double-encoding).
/// </summary>
/// <param name="s">The string to encode.</param>
/// <param name="encodeSpaceAsPlus">If true, spaces will be encoded as + signs. Otherwise, they'll be encoded as %20.</param>
/// <returns>The encoded URL.</returns>
public static string EncodeIllegalCharacters(string s, bool encodeSpaceAsPlus = false) {
if (string.IsNullOrEmpty(s))
return s;
if (encodeSpaceAsPlus)
s = s.Replace(" ", "+");
// Uri.EscapeUriString mostly does what we want - encodes illegal characters only - but it has a quirk
// in that % isn't illegal if it's the start of a %-encoded sequence https://stackoverflow.com/a/47636037/62600
// no % characters, so avoid the regex overhead
if (!s.Contains("%"))
return Uri.EscapeUriString(s);
// pick out all %-hex-hex matches and avoid double-encoding
return Regex.Replace(s, "(.*?)((%[0-9A-Fa-f]{2})|$)", c => {
var a = c.Groups[1].Value; // group 1 is a sequence with no %-encoding - encode illegal characters
var b = c.Groups[2].Value; // group 2 is a valid 3-character %-encoded sequence - leave it alone!
return Uri.EscapeUriString(a) + b;
});
}
一个简单的单线:
public static string Combine(this string uri1, string uri2) => $"{uri1.TrimEnd('/')}/{uri2.TrimStart('/')}";
灵感来自@Matt Sharpe的回答。
使用此项:
public static class WebPath
{
public static string Combine(params string[] args)
{
var prefixAdjusted = args.Select(x => x.StartsWith("/") && !x.StartsWith("http") ? x.Substring(1) : x);
return string.Join("/", prefixAdjusted);
}
}
如果任何人正在寻找一个单行,并且只想在不创建新方法或引用新库的情况下连接路径的一部分,或者构造URI值并将其转换为字符串,那么。。。
string urlToImage = String.Join("/", "websiteUrl", "folder1", "folder2", "folder3", "item");
这很基本,但我看不出你还需要什么。如果你害怕“/”加倍,那么你可以简单地在后面做一个替换(“//”,“/”)。如果您害怕替换“https://”中的双引号“//”,那么请执行一次连接,替换双引号“/”,然后加入网站url(但是我很确定大多数浏览器会自动将前面带有“https://的内容转换为正确格式)。这看起来像:
string urlToImage = String.Join("/","websiteUrl", String.Join("/", "folder1", "folder2", "folder3", "item").Replace("//","/"));
这里有很多答案可以解决以上所有问题,但在我的情况下,我只需要在一个地方使用一次,不需要过度依赖它。此外,很容易看到这里发生了什么。
参见:https://learn.microsoft.com/en-us/dotnet/api/system.string.join?view=netframework-4.8
根据您提供的示例URL,我将假设您希望组合与站点相关的URL。
基于这一假设,我将提出这个解决方案,作为对您的问题的最恰当的回答:“Path.Combine很方便,在URL框架中有类似的功能吗?”
由于URL框架中有一个类似的函数,我建议正确的方法是:“VirtualPathUtility.Compine”方法。下面是MSDN参考链接:VirtualPathUtility.Combine方法
有一个警告:我认为这只适用于与您的网站相关的url(即,您不能使用它来生成指向另一个网站的链接。例如,var url=VirtualPathUtility.Combine(“www.google.com”,“accounts/widgets”);)。