C# - Delete the slash at the end of URI-CodePudding

I would like to remove the slash at the end of the URI, while keeping the query parameter.

For example:

I get an object of type URI as input with the value: https://stackoverflow.com/questions/ask/

I would like to remove the last "/" to get: https://stackoverflow.com/questions/ask

In some cases I may have parameters: https://stackoverflow.com/questions/ask/?test=test1

I would like to get: https://stackoverflow.com/questions/ask?test=test1

Thanks in advance.

CodePudding user response：

string url1 = "https://stackoverflow.com/questions/ask/";
string url2 = "https://stackoverflow.com/questions/ask/?test=test1";

//remove slash at end
Console.WriteLine(url1.TrimEnd('/'));

//remove slash preceding query parameters
int last = url2.LastIndexOf('?');
url2 = url2.Remove(last - 1, 1);
Console.WriteLine(url2);

There probably is a way to search and replace the last slash using Regex as well, since there is Regex.Replace()

CodePudding user response：

You can first check if the URL has any query parameters by checking latest index of ? character. If there is ?, take before that, remove last character (which is / that you don't want) and combine it again. If it doesn't have any query parameters, just remove the last character! You can create an extension method like this;

public static string RemoveSlash(this string url)
{
    var queryIndex = url.LastIndexOf('?');
    if (queryIndex >= 0)
    {
        var urlWithoutQueryParameters = url[..queryIndex];
        if (urlWithoutQueryParameters.EndsWith("/"))
        {
            urlWithoutQueryParameters = urlWithoutQueryParameters[..^1];
        }
        var queryParemeters = url[queryIndex..];

        return urlWithoutQueryParameters   queryParemeters;
    }
    else if (url.EndsWith("/"))
    {
        return url[..^1];
    }
    
    return url;
}

Then you can use it like this;

var url1 = "https://stackoverflow.com/questions/ask";
var url2 = "https://stackoverflow.com/questions/ask/";
Console.WriteLine(url1.RemoveSlash()); // https://stackoverflow.com/questions/ask
Console.WriteLine(url2.RemoveSlash()); // https://stackoverflow.com/questions/ask

var url3 = "https://stackoverflow.com/questions/ask/?test=test1";
var url4 = "https://stackoverflow.com/questions/ask?test=test1";
Console.WriteLine(url3.RemoveSlash()); // https://stackoverflow.com/questions/ask?test=test1
Console.WriteLine(url4.RemoveSlash()); // https://stackoverflow.com/questions/ask?test=test1