Plz Explain me this ASP.Net code !!!

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Dear Friends,

I'm learning Open Authentication & is unable to understand this code.
Someone Plz Explain me this code:

C#

string discoveryUri = "https://www.google.com/accounts/o8/id";
OpenIdRelyingParty openid = new OpenIdRelyingParty();
var b = new UriBuilder(Request.Url) { Query = "" };
var req = openid.CreateRequest(discoveryUri, b.Uri, b.Uri);
req.RedirectToProvider();

Especially I'm not getting the 3rd line of this code.
Someone Plz Help me here.

Thanks in Advance.
Gittu

Posted 19-Oct-12 2:55am

P_Dash

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[no name] 19-Oct-12 8:58am

Is MSDN broken again? Have you notified Microsoft?

P_Dash 19-Oct-12 9:14am

Sorry I'm not getting if there is any link of this with MSDN !!!

I.explore.code 19-Oct-12 9:21am

apparently that will help you understand how to create an instance with inline initialisation of properties? if not then perhaps you need to ask specific question than "I'm not getting the 3rd line of this code".

P_Dash 19-Oct-12 10:23am

Bro Particularly in 3rd Line what is the use of "{ Query = "" }", this statement ???

[no name] 19-Oct-12 9:30am

You are joking right? www.msdn.microsoft.com

P_Dash 19-Oct-12 10:22am

Ha Ha.
No no Bro...As a .Net Developer how is it possible dat I don't know MSDN.
Actually I wanted to say is dere any link of this question with the Answer U post ??

[no name] 19-Oct-12 10:26am

Since you did not ask a question and all you want is for someone to teach you how to program, MSDN is what you need. Did you bother searching MSDN for whatever it is that you cannot figure out?

P_Dash 21-Oct-12 2:13am

Actually I've Searched in MSDN before Posting my question here.
But didn't find any Particular Solution to my doubt, so asked here.

S@53K^S 19-Oct-12 11:50am

Initialization of property Query with empty string.Read more about that here http://www.codeproject.com/Articles/22311/C-3-0-Features.

Object Initializer is the sub heading.

and please try do your homework before posting question

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Keith Barrow · Accepted Answer · 2012-10-19T06:30:00

Solution 2

var b = new UriBuilder(Request.Url) { Query = "" };

Just employs some of syntactic sugar, it can be re-written.

UriBuilder b = new UriBuilder(Request.Url);
b.Query = "";

The var keyword replaces the type name in the declaration, it is worked out by the compiler at compile time.

{ Query = "" } sets the b.Query property to "".

[Edit]
In response to the OP's comment

Wow I misread the earlier part of your code. The answer is keeping the query string will very probably cause problems. The second parameter in openid.CreateRequest(discoveryUri, b.Uri, b.Uri); needs to be "the shortest url that describes your wesites address[^]". This can't possibly contain the query string. Also, it is possible that the string you are passing is not short enough as the Open Auth object expects www.foo.com, not www.foo.com/bar for example. It is doubtful that the third parameter should have the query string either, but this depends on what the page you land on in your site after successful authentication expects:- you'd need to check this.

Posted 19-Oct-12 6:30am

Keith Barrow

Updated 26-Oct-12 3:48am

v4

Comments

P_Dash 21-Oct-12 2:11am

Thank U Very Much Sir.

Well could u plz Tell Me if I remove the line { Query = "" } or b.Query = ""; from the code, then will it Hamper my Code in any Means ??

Keith Barrow 21-Oct-12 5:17am

Without seeing the rest of your code, it is hard to say. My guess is that whoever wrote this code wants to copy all the information from the request url, but needs to strip the query part out for some reason. This was probably done for a reason, so my guess is that the assignment is needed. The best thing to do is for you to trace through the code yourself and see what effect removing the assignment has

P_Dash 26-Oct-12 9:10am

Sir, basically I'm using this for Open Authentication using GMail Authentication.
So now can u plz tell me if removing Query part will hamper my Result or Not ?

Keith Barrow 26-Oct-12 9:45am

Hi, I've updated my answer. You need to remove the query string for the open ID request, see my answer for the reasons.

P_Dash 26-Oct-12 10:05am

Well Sir, I'm getting perfect result without removing the Query String, means the code I've mentioned on the 1st thread is working perfectly fine.

So I think this is not a problem what u mentioned in ur Edited post.

I just want to know What's the Purpose of mentioning Query String, also if I mention Query String=<some value=""> then what will happen ??

Keith Barrow 26-Oct-12 10:16am

By clearing the query string I mean this in your code { Query = "" };

The Query string taken from the incoming URL, it follows a ? at the end of the address of the page in the URL, See http://en.wikipedia.org/wiki/Query_string

P_Dash 26-Oct-12 11:53am

Sir I know abt Query String.
I just want to know do we mention Query String value here to take an Input or Just to mention that nothing is Passed??

Keith Barrow 26-Oct-12 12:00pm

The query string comes in via the URL, it is stored in the Request.Url
Request.Url is used to copy the URL of the current page into the Uri.Builder object, this includes the query string part.
Because the Open ID wants the shortest form of the web's URL, the query string needs to be stripped, line 3 of your code sample does this.

The rest you'll have to work out for yourself.

P_Dash 26-Oct-12 12:11pm

Thank U Very Much Sir.
I think Now I got the Whole idea Why that b.Query is mentioned.

Sir Can U Plz Go Through this Thread:

http://www.codeproject.com/Questions/484599/PlzplusCheckplusthisplusWCF-RESTplusProjectplus-26

I'm Facing a Problem here & I hope U can Provide me the Solution.

Thanks

AspDotNetDev · Accepted Answer · 2012-10-19T06:11:00

I'll explain a few terms relating to the third line so that you can know what to Google to do further research.

First of all, you have the "var" keyword, which is used to create a variable that has its type inferred by the compiler. It is still strongly typed, but you don't have to explicitly write the type.

Next, you are using the "new" keyword to create an instance of a variable, in this case a new UriBuilder.

To the right of the UriBuilder, you see some parens with a parameter in between them. That is called a constructor. With this constructor, you are passing in a URL to use as the basis for creating your UriBuilder. The URL passed in this case is the URL of the current request.

Finally, you have an object initializer, which will set properties on the variable after the constructor is run. The property that is set in this case is the query string.

Plz Explain me this ASP.Net code !!!

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Plz Explain me this ASP.Net code !!!

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