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
这里已经有了一些很好的答案。根据mdsharpe的建议,这里有一个扩展方法,当您想处理Uri实例时可以轻松使用:
using System;
using System.Linq;
public static class UriExtensions
{
public static Uri Append(this Uri uri, params string[] paths)
{
return new Uri(paths.Aggregate(uri.AbsoluteUri, (current, path) => string.Format("{0}/{1}", current.TrimEnd('/'), path.TrimStart('/'))));
}
}
使用示例:
var url = new Uri("http://example.com/subpath/").Append("/part1/", "part2").AbsoluteUri;
这将产生http://example.com/subpath/part1/part2
如果您希望使用字符串而不是Uris,那么以下操作也会产生相同的结果,只需根据您的需要进行调整即可:
public string JoinUriSegments(string uri, params string[] segments)
{
if (string.IsNullOrWhiteSpace(uri))
return null;
if (segments == null || segments.Length == 0)
return uri;
return segments.Aggregate(uri, (current, segment) => $"{current.TrimEnd('/')}/{segment.TrimStart('/')}");
}
var uri = JoinUriSegements("http://example.com/subpath/", "/part1/", "part2");
其他回答
您使用Uri.TryCreate(…):
Uri result = null;
if (Uri.TryCreate(new Uri("http://msdn.microsoft.com/en-us/library/"), "/en-us/library/system.uri.trycreate.aspx", out result))
{
Console.WriteLine(result);
}
将返回:
http://msdn.microsoft.com/en-us/library/system.uri.trycreate.aspx
我们使用以下简单的助手方法将任意数量的URL部分连接在一起:
public static string JoinUrlParts(params string[] urlParts)
{
return string.Join("/", urlParts.Where(up => !string.IsNullOrEmpty(up)).ToList().Select(up => up.Trim('/')).ToArray());
}
注意,它不支持'..//something/page.htm'样式的相对URL!
我创建了这个功能,可以让您的生活更轻松:
/// <summary>
/// The ultimate Path combiner of all time
/// </summary>
/// <param name="IsURL">
/// true - if the paths are Internet URLs, false - if the paths are local URLs, this is very important as this will be used to decide which separator will be used.
/// </param>
/// <param name="IsRelative">Just adds the separator at the beginning</param>
/// <param name="IsFixInternal">Fix the paths from within (by removing duplicate separators and correcting the separators)</param>
/// <param name="parts">The paths to combine</param>
/// <returns>the combined path</returns>
public static string PathCombine(bool IsURL , bool IsRelative , bool IsFixInternal , params string[] parts)
{
if (parts == null || parts.Length == 0) return string.Empty;
char separator = IsURL ? '/' : '\\';
if (parts.Length == 1 && IsFixInternal)
{
string validsingle;
if (IsURL)
{
validsingle = parts[0].Replace('\\' , '/');
}
else
{
validsingle = parts[0].Replace('/' , '\\');
}
validsingle = validsingle.Trim(separator);
return (IsRelative ? separator.ToString() : string.Empty) + validsingle;
}
string final = parts
.Aggregate
(
(string first , string second) =>
{
string validfirst;
string validsecond;
if (IsURL)
{
validfirst = first.Replace('\\' , '/');
validsecond = second.Replace('\\' , '/');
}
else
{
validfirst = first.Replace('/' , '\\');
validsecond = second.Replace('/' , '\\');
}
var prefix = string.Empty;
if (IsFixInternal)
{
if (IsURL)
{
if (validfirst.Contains("://"))
{
var tofix = validfirst.Substring(validfirst.IndexOf("://") + 3);
prefix = validfirst.Replace(tofix , string.Empty).TrimStart(separator);
var tofixlist = tofix.Split(new[] { separator } , StringSplitOptions.RemoveEmptyEntries);
validfirst = separator + string.Join(separator.ToString() , tofixlist);
}
else
{
var firstlist = validfirst.Split(new[] { separator } , StringSplitOptions.RemoveEmptyEntries);
validfirst = string.Join(separator.ToString() , firstlist);
}
var secondlist = validsecond.Split(new[] { separator } , StringSplitOptions.RemoveEmptyEntries);
validsecond = string.Join(separator.ToString() , secondlist);
}
else
{
var firstlist = validfirst.Split(new[] { separator } , StringSplitOptions.RemoveEmptyEntries);
var secondlist = validsecond.Split(new[] { separator } , StringSplitOptions.RemoveEmptyEntries);
validfirst = string.Join(separator.ToString() , firstlist);
validsecond = string.Join(separator.ToString() , secondlist);
}
}
return prefix + validfirst.Trim(separator) + separator + validsecond.Trim(separator);
}
);
return (IsRelative ? separator.ToString() : string.Empty) + final;
}
它适用于URL和普通路径。
用法:
// Fixes internal paths
Console.WriteLine(PathCombine(true , true , true , @"\/\/folder 1\/\/\/\\/\folder2\///folder3\\/" , @"/\somefile.ext\/\//\"));
// Result: /folder 1/folder2/folder3/somefile.ext
// Doesn't fix internal paths
Console.WriteLine(PathCombine(true , true , false , @"\/\/folder 1\/\/\/\\/\folder2\///folder3\\/" , @"/\somefile.ext\/\//\"));
//result : /folder 1//////////folder2////folder3/somefile.ext
// Don't worry about URL prefixes when fixing internal paths
Console.WriteLine(PathCombine(true , false , true , @"/\/\/https:/\/\/\lul.com\/\/\/\\/\folder2\///folder3\\/" , @"/\somefile.ext\/\//\"));
// Result: https://lul.com/folder2/folder3/somefile.ext
Console.WriteLine(PathCombine(false , true , true , @"../../../\\..\...\./../somepath" , @"anotherpath"));
// Result: \..\..\..\..\...\.\..\somepath\anotherpath
这是我的方法,我也会自己使用:
public static string UrlCombine(string part1, string part2)
{
string newPart1 = string.Empty;
string newPart2 = string.Empty;
string seperator = "/";
// If either part1 or part 2 is empty,
// we don't need to combine with seperator
if (string.IsNullOrEmpty(part1) || string.IsNullOrEmpty(part2))
{
seperator = string.Empty;
}
// If part1 is not empty,
// remove '/' at last
if (!string.IsNullOrEmpty(part1))
{
newPart1 = part1.TrimEnd('/');
}
// If part2 is not empty,
// remove '/' at first
if (!string.IsNullOrEmpty(part2))
{
newPart2 = part2.TrimStart('/');
}
// Now finally combine
return string.Format("{0}{1}{2}", newPart1, seperator, newPart2);
}
这是Microsoft的(OfficeDev PnP)方法UrlUtility。组合:
const char PATH_DELIMITER = '/';
/// <summary>
/// Combines a path and a relative path.
/// </summary>
/// <param name="path"></param>
/// <param name="relative"></param>
/// <returns></returns>
public static string Combine(string path, string relative)
{
if(relative == null)
relative = String.Empty;
if(path == null)
path = String.Empty;
if(relative.Length == 0 && path.Length == 0)
return String.Empty;
if(relative.Length == 0)
return path;
if(path.Length == 0)
return relative;
path = path.Replace('\\', PATH_DELIMITER);
relative = relative.Replace('\\', PATH_DELIMITER);
return path.TrimEnd(PATH_DELIMITER) + PATH_DELIMITER + relative.TrimStart(PATH_DELIMITER);
}
来源:GitHub