How to avoid that UriBuilder creates Uri with unencoded + sign in its query string?

问题

I have some trouble with the UriBuilder and Uri classes in .Net. I want to build my Uri with a UriBuilder, and then use the resulting Uri. However, I cant get it to correctly encode the plus sign in its query string?

Here is a small code example:

var ub = new UriBuilder();
ub.Query = "t=a%2bc";
Console.WriteLine(ub.Uri.ToString());

This example gives me http://localhost/?t=a+c, but I would expect that the plus sign was encoded to %2b like this http://localhost/?t=a%2bc otherwise I cant use the url.

I could of course build a string instead, but I would prefer to use the strongly typed Uri if possible.

回答1:

Interestingly, this seems to be "fixed" in .NET 4.5.

This is the result of my testing in .NET 4.0: (from the immediate window)

? ub.Uri.ToString()
"http://localhost/?t=a+c"

But in .NET 4.5:

? ub.Uri.ToString()
"http://localhost/?t=a%2bc"

Which is what you are looking for.

Can you upgrade to 4.5? This would fix your problem.

If you cannot upgrade, let me know and I'll attempt to find a work around.

回答2:

I ended up with a custom Uri class wrapping the Uri for now until we have the chance to update to VS2012/.Net4.5. Most Uris in the system Im working on are not created by newing Uris but instead with a Querybuilder method which means it was "easy" to swap that part to return a Uri2 instead of a Uri.

public class Uri2 : Uri
{
    public Uri2(Uri uri)
        : base(uri.ToString())
    {

    }

    public override string ToString()
    {
        var s = base.ToString();
        s = s.Replace("+", "%2b");
        return s;
    }
}

回答3:

Use AbsoluteUri instead of ToString():

var ub = new UriBuilder();
ub.Query = "t=a%2bc";
Console.WriteLine(ub.Uri.AbsoluteUri);

this gives the correct result:

http://localhost/?t=a%2bc

来源：https://stackoverflow.com/questions/15118269/how-to-avoid-that-uribuilder-creates-uri-with-unencoded-sign-in-its-query-stri

标签

ASP.NET

urlencode