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
我结合了前面的所有答案:
public static string UrlPathCombine(string path1, string path2)
{
path1 = path1.TrimEnd('/') + "/";
path2 = path2.TrimStart('/');
return Path.Combine(path1, path2)
.Replace(Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar);
}
[TestMethod]
public void TestUrl()
{
const string P1 = "http://msdn.microsoft.com/slash/library//";
Assert.AreEqual("http://msdn.microsoft.com/slash/library/site.aspx", UrlPathCombine(P1, "//site.aspx"));
var path = UrlPathCombine("Http://MyUrl.com/", "Images/Image.jpg");
Assert.AreEqual(
"Http://MyUrl.com/Images/Image.jpg",
path);
}
其他回答
所以我有另一种方法,类似于使用UriBuilder的每个人。
我不想拆分我的BaseUrl(它可以包含路径的一部分,例如。http://mybaseurl.com/dev/)正如javajavajavajava所做的那样。
下面的代码片段显示了代码+测试。
注意:此解决方案降低了主机并附加了一个端口。如果不需要这样做,可以通过例如利用UriBuilder的Uri属性来编写字符串表示。
public class Tests
{
public static string CombineUrl (string baseUrl, string path)
{
var uriBuilder = new UriBuilder (baseUrl);
uriBuilder.Path = Path.Combine (uriBuilder.Path, path);
return uriBuilder.ToString();
}
[TestCase("http://MyUrl.com/", "/Images/Image.jpg", "http://myurl.com:80/Images/Image.jpg")]
[TestCase("http://MyUrl.com/basePath", "/Images/Image.jpg", "http://myurl.com:80/Images/Image.jpg")]
[TestCase("http://MyUrl.com/basePath", "Images/Image.jpg", "http://myurl.com:80/basePath/Images/Image.jpg")]
[TestCase("http://MyUrl.com/basePath/", "Images/Image.jpg", "http://myurl.com:80/basePath/Images/Image.jpg")]
public void Test1 (string baseUrl, string path, string expected)
{
var result = CombineUrl (baseUrl, path);
Assert.That (result, Is.EqualTo (expected));
}
}
在Windows 10上使用.NET Core 2.1进行测试。
为什么这样做?
尽管Path.Combine将返回反斜杠(至少在Windows上),但UriBuilder在路径设置器中处理这种情况。
摘自https://github.com/dotnet/corefx/blob/master/src/System.Private.Uri/src/System/UriBuilder.cs(注意调用字符串。替换)
[AllowNull]
public string Path
{
get
{
return _path;
}
set
{
if ((value == null) || (value.Length == 0))
{
value = "/";
}
_path = Uri.InternalEscapeString(value.Replace('\\', '/'));
_changed = true;
}
}
这是最好的方法吗?
当然,这个解决方案非常自我描述(至少在我看来)。但是,您依赖的是.NETAPI中的未记录(至少我在快速谷歌搜索中没有发现任何内容)“功能”。这可能会随着将来的版本而改变,因此请将方法与测试结合起来。
中有测试https://github.com/dotnet/corefx/blob/master/src/System.Private.Uri/tests/FunctionalTests/UriBuilderTests.cs(Path_Get_Set),用于检查\是否正确转换。
附带说明:如果Uri将用于System.Uri构造函数,则也可以直接使用UriBuilder.Uri属性。
我发现以下功能很有用,并且具有以下功能:
抛出空或空白对多个Url段采用多个params参数在null或空时引发
班
public static class UrlPath
{
private static string InternalCombine(string source, string dest)
{
if (string.IsNullOrWhiteSpace(source))
throw new ArgumentException("Cannot be null or white space", nameof(source));
if (string.IsNullOrWhiteSpace(dest))
throw new ArgumentException("Cannot be null or white space", nameof(dest));
return $"{source.TrimEnd('/', '\\')}/{dest.TrimStart('/', '\\')}";
}
public static string Combine(string source, params string[] args)
=> args.Aggregate(source, InternalCombine);
}
测验
UrlPath.Combine("test1", "test2");
UrlPath.Combine("test1//", "test2");
UrlPath.Combine("test1", "/test2");
// Result = test1/test2
UrlPath.Combine(@"test1\/\/\/", @"\/\/\\\\\//test2", @"\/\/\\\\\//test3\") ;
// Result = test1/test2/test3
UrlPath.Combine("/test1/", "/test2/", null);
UrlPath.Combine("", "/test2/");
UrlPath.Combine("/test1/", null);
// Throws an ArgumentException
我使用此代码来解决问题:
string[] brokenBaseUrl = Context.Url.TrimEnd('/').Split('/');
string[] brokenRootFolderPath = RootFolderPath.Split('/');
for (int x = 0; x < brokenRootFolderPath.Length; x++)
{
//if url doesn't already contain member, append it to the end of the string with / in front
if (!brokenBaseUrl.Contains(brokenRootFolderPath[x]))
{
if (x == 0)
{
RootLocationUrl = Context.Url.TrimEnd('/');
}
else
{
RootLocationUrl += String.Format("/{0}", brokenRootFolderPath[x]);
}
}
}
组合它们并确保始终正确的一种简单方法是:
string.Format("{0}/{1}", Url1.Trim('/'), Url2);
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;
});
}