我发现Uri构造函数将“\”转换为“/”。因此，您也可以将Path.Combine与Uri构造函数一起使用。

 Uri baseUri = new Uri("http://MyUrl.com");
 string path = Path.Combine("Images", "Image.jpg");
 Uri myUri = new Uri(baseUri, path);

为什么不使用以下选项。

System.IO.Path.Combine(rootUrl, subPath).Replace(@"\", "/")

这两种方法都有效：

  Uri final = new Uri(Regex.Replace(baseUrl + "/" + relativePath, "(?<!http:)/{2,}", "/"));

Or

  Uri final =new Uri(string.Format("{0}/{1}", baseUrl.ToString().TrimEnd('/'), relativePath.ToString().TrimStart('/')));

即，如果

baseUrl = "http://tesrurl.test.com/Int18"

and

relativePath = "To_Folder"

output = http://tesrurl.test.com/Int18/To_Folder

以下代码将出现一些错误：

 // If you use the below code, some issues will be there in the final URI
 Uri final = new Uri(baseUrl, relativePath);

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 '&amp;' 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;
        });
    }

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

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]);
        }
    }
}