Hi
if I have a url/query like "localhost?a&b& c=123" then I thought I could
get these parameters and values by using
NameValueCollec tion query = HttpContext.Cur rent.Request.Qu eryString;
But if I then try "query.AllK eys" I only get two keys, namely "null"
and "c".
Is this correct behaviour? Are "a" and "b" considered to be values for
a null key - and how do I get them from the collection?
Thanks,
Peter
12  14883 
Peter wrote:
Hi
if I have a url/query like "localhost?a&b& c=123" then I thought I could
get these parameters and values by using
NameValueCollec tion query = HttpContext.Cur rent.Request.Qu eryString;
But if I then try "query.AllK eys" I only get two keys, namely "null"
and "c".
Is this correct behaviour? Are "a" and "b" considered to be values for
a null key - and how do I get them from the collection?
Shouldn't the query string be: "localhost?a=&b =&c=123" ?
FB
--
------------------------------------------------------------------------
Lead developer of LLBLGen Pro, the productive O/R mapper for .NET
LLBLGen Pro website: http://www.llblgen.com
My .NET blog: http://weblogs.asp.net/fbouma
Microsoft MVP (C#)
------------------------------------------------------------------------
Frans Bouma [C# MVP] wrote:
if I have a url/query like "localhost?a&b& c=123" then I thought I
could get these parameters and values by using
NameValueCollec tion query = HttpContext.Cur rent.Request.Qu eryString;
But if I then try "query.AllK eys" I only get two keys, namely "null"
and "c".
Is this correct behaviour? Are "a" and "b" considered to be values
for a null key - and how do I get them from the collection?
Shouldn't the query string be: "localhost?a=&b =&c=123" ?
Yes, I think you're right, the query should really look like that.
I guess I should ignore any null keys I get from AllKeys (what can I
use a null key for anyway?)
Thanks,
Peter
On Apr 25, 5:35*am, "Peter" <xdz...@hotmail .comwrote:
Frans Bouma [C# MVP] wrote:
if I have a url/query like "localhost?a&b& c=123" then I thought I
could get these parameters and values by using
NameValueCollec tion query = HttpContext.Cur rent.Request.Qu eryString;
But if I then try "query.AllK eys" I only get two keys, namely "null"
and "c".
Is this correct behaviour? Are "a" and "b" considered to be values
for a null key - and how do I get them from the collection?
* *Shouldn't the query string be: "localhost?a=&b =&c=123" ?
Yes, I think you're right, the query should really look like that.
I guess I should ignore any null keys I get from AllKeys (what can I
use a null key for anyway?)
Thanks,
Peter
Who is generating that query string?
As Frans mentioned it's wrong.
You should have default values for all your parameters, and then just
update those with values in the QS.
so all you have to do at the most is adding a if (key==null) continue;
Ignacio Machin ( .NET/ C# MVP ) wrote:
On Apr 25, 5:35*am, "Peter" <xdz...@hotmail .comwrote:
Frans Bouma [C# MVP] wrote:
if I have a url/query like "localhost?a&b& c=123" then I thought
I could get these parameters and values by using
NameValueCollec tion query =
HttpContext.Cur rent.Request.Qu eryString;
But if I then try "query.AllK eys" I only get two keys, namely
"null" and "c".
Is this correct behaviour? Are "a" and "b" considered to be
values for a null key - and how do I get them from the
collection?
* *Shouldn't the query string be: "localhost?a=&b =&c=123" ?
Yes, I think you're right, the query should really look like that.
I guess I should ignore any null keys I get from AllKeys (what can I
use a null key for anyway?)
Thanks,
Peter
Who is generating that query string?
As Frans mentioned it's wrong.
You should have default values for all your parameters, and then just
update those with values in the QS.
so all you have to do at the most is adding a if (key==null) continue;
In my program I was using AllKeys, and looping over the keys doing some
processing. Unfortunately I did not take account of the fact that a key
could be null.
A user decided to edit the query string himself, and then we got an
exception.
I did just like you said, and now check if the key is null before
processing it.
I can't really see the point in AllKeys returning a null key, but there
you go...
/Peter
It is very common to see querystrings with null key values (e.g., &ua=&bg=1 )
rather than the key not being present. Just take a look at some google
searches to see examples of this.
-- Peter
To be a success, arm yourself with the tools you need and learn how to use
them.
Site: http://www.eggheadcafe.com http://petesbloggerama.blogspot.com http://ittyurl.net
"Peter" wrote:
Ignacio Machin ( .NET/ C# MVP ) wrote:
On Apr 25, 5:35 am, "Peter" <xdz...@hotmail .comwrote:
Frans Bouma [C# MVP] wrote:
>
if I have a url/query like "localhost?a&b& c=123" then I thought
I could get these parameters and values by using
NameValueCollec tion query =
HttpContext.Cur rent.Request.Qu eryString;
>
But if I then try "query.AllK eys" I only get two keys, namely
"null" and "c".
>
Is this correct behaviour? Are "a" and "b" considered to be
values for a null key - and how do I get them from the
collection?
>
Shouldn't the query string be: "localhost?a=&b =&c=123" ?
>
Yes, I think you're right, the query should really look like that.
>
I guess I should ignore any null keys I get from AllKeys (what can I
use a null key for anyway?)
>
Thanks,
Peter
Who is generating that query string?
As Frans mentioned it's wrong.
You should have default values for all your parameters, and then just
update those with values in the QS.
so all you have to do at the most is adding a if (key==null) continue;
In my program I was using AllKeys, and looping over the keys doing some
processing. Unfortunately I did not take account of the fact that a key
could be null.
A user decided to edit the query string himself, and then we got an
exception.
I did just like you said, and now check if the key is null before
processing it.
I can't really see the point in AllKeys returning a null key, but there
you go...
/Peter
Peter Bromberg [C# MVP] wrote:
It is very common to see querystrings with null key values (e.g.,
&ua=&bg=1 ) rather than the key not being present. Just take a look
at some google searches to see examples of this.
In your example there are no "null keys". You have a key called "ua"
and a key called "bg".
The value for ua is empty, and the value for bg is 1.
If your query string was "&ua&bg=1" then AllKeys would return two keys:
null and "bg".
I don't really understand the point of a null key.
/Peter
There needs to be an equals (=) sign after each key name.
-- Peter
To be a success, arm yourself with the tools you need and learn how to use
them.
Site: http://www.eggheadcafe.com http://petesbloggerama.blogspot.com http://ittyurl.net
"Peter" wrote:
Peter Bromberg [C# MVP] wrote:
It is very common to see querystrings with null key values (e.g.,
&ua=&bg=1 ) rather than the key not being present. Just take a look
at some google searches to see examples of this.
In your example there are no "null keys". You have a key called "ua"
and a key called "bg".
The value for ua is empty, and the value for bg is 1.
If your query string was "&ua&bg=1" then AllKeys would return two keys:
null and "bg".
I don't really understand the point of a null key.
/Peter
Peter Bromberg [C# MVP] wrote:
There needs to be an equals (=) sign after each key name.
Yes indeed. I found that out. But what to do if a user enters the query
string in the browser....
It seems strange to me that (1) the browser (internet explorer) sends
an "illegal" query string; and (2) the AllKeys property returns a key
which is null - using a null key to retrieve a value from the
NameValueCollec tion results in an error of course.
/Peter
I think it would be pretty rare for a web application that expects a user to
be creating their "own" querystrings. You can type whatever gobbledegook you
want after a URI in the Address Bar of your browser, and the browser will
happily attempt to retrieve the resource for you. Cheers.
-- Peter
To be a success, arm yourself with the tools you need and learn how to use
them.
Site: http://www.eggheadcafe.com http://petesbloggerama.blogspot.com http://ittyurl.net
"Peter" wrote:
Peter Bromberg [C# MVP] wrote:
There needs to be an equals (=) sign after each key name.
Yes indeed. I found that out. But what to do if a user enters the query
string in the browser....
It seems strange to me that (1) the browser (internet explorer) sends
an "illegal" query string; and (2) the AllKeys property returns a key
which is null - using a null key to retrieve a value from the
NameValueCollec tion results in an error of course.
/Peter
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