how can i modified the querystring?
I have capture the query string like this
qs = Request.QueryString["flag"].ToString();
and then rebuilt the query string with modified values
and response.redirect(url & qs) to it
While I'm not sure I'd suggest using this approach liberally, if you wanted to reconstruct the path and query string with a few changes... you could convert the query string to an editable collection, modify it, then rebuild it from your new collection.
Goofy example...
// create dictionary (editable collection) of querystring
var qs = Request.QueryString.AllKeys
.ToDictionary(k => k, k => Request.QueryString[k]);
// modify querystring
qs["flag"] = "2";
// rebuild querystring
var redir = string.Format("{0}{1}", Request.Path,
qs.Aggregate(new StringBuilder(),
(sb, arg) => sb.AppendFormat("{0}{1}={2}",
sb.Length > 0 ? "&" : "?", arg.Key, arg.Value)));
// do something with it
Response.Redirect(redir);
While I definitely wouldn't recommend the below for production code, for testing purposes you can use reflection to make the querystring collection editable.
// Get the protected "IsReadOnly" property of the collection
System.Reflection.PropertyInfo prop = Request.QueryString.GetType()
.GetProperty("IsReadOnly", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
// Set the property false (writable)
prop.SetValue(Request.QueryString, false, null);
// Have your way with it.
Request.QueryString.Add("flag", "2");
To combine the required destination URL based on the Request’s properties, use something like this:
string destUrl = string.Format("{0}://{1}{2}/", Request.Url.Scheme, Request.Url.Authority, Request.Url.AbsolutePath);
if (destUrl.EndsWith("/"))
destUrl = destUrl.TrimEnd(new char[] { '/' });
if (!string.IsNullOrEmpty(Request.QueryString["paramName"])) {
destUrl = string.Format("{0}?paramName={1}", destUrl, "paramValueHere");
Response.Redirect(destUrl);
}
i am not sure if I understand your question. You can just alter the string qs and use.
qs = qs + "modification"
Response.Redirect("this.aspx?flag=" + qs )
The stuff in the Request class deals with the request that got you to the page. You can't edit it because the client constructed it, not the server.
Related
I have a query string that looks something like this:
"somename1=123&QueryString=PlaceHolder%3dNothing%26anotherid%3dsomevalue&somename=somevalue"
but I want the query string to be something like the query string below and replace the whole query string with the updated one is there any way to do that without redirection?
"somename1=somevalue1&PlaceHolder=Nothing&somename2=somevalue2&somename3=somevalue3"
basically need to remove:
"QueryString=" with empty string
"%3d" with "&"
"%26" with "="
So far I've done is:
string strQueryString = Request.QueryString.ToString();
if (strQueryString.Contains("QueryString="))
{
strQueryString = strQueryString.Replace("QueryString=", "");
if (strQueryString.Contains("%26")) strQueryString = strQueryString.Replace("%26", "&");
if (strQueryString.Contains("%3d")) strQueryString = strQueryString.Replace("%3d", "=");
string x = strQueryString;
}
and:
// reflect to readonly property
PropertyInfo isreadonly = typeof(System.Collections.Specialized.NameValueCollection).GetProperty("IsReadOnly", BindingFlags.Instance | BindingFlags.NonPublic);
// make collection editable
isreadonly.SetValue(this.Request.QueryString, false, null);
if (this.Request.QueryString.ToString().Contains("QueryString="))
{
this.Request.QueryString.ToString().Replace("QueryString=", "");
if (this.Request.QueryString.ToString().Contains("%26")) this.Request.QueryString.ToString().Replace("%26", "&");
if (this.Request.QueryString.ToString().Contains("%3d")) this.Request.QueryString.ToString().Replace("%3d", "=");
string x = this.Request.QueryString.ToString();
}
// make collection readonly again
isreadonly.SetValue(this.Request.QueryString, true, null);
The second part of the code is not replacing the characters and I don't know how after removing all character or replacing them change the query string to new query string.
Any help is greatly appreciated.
Changing the query string of the current request is not supported. Using private Reflection to edit some in-memory state will most likely break ASP.NET because it assumes that the query string is immutable. The only way to change the query string is to issue a new request, either by doing a redirect, or by doing a sort of sub-request, such as by making a new HTTP request to the same page but with a different query string.
May I suggest a not very well known built in key/value dictionary, Context.Items.
With this you very like get a better performance than toggle the readonly QueryString object, and it also last throughout a request so you can share it between module, handlers, etc.
Create
string strQueryString = Request.QueryString.ToString();
if (strQueryString.Contains("QueryString="))
{
HttpContext.Current.Items("qs") = strQueryString.Replace("QueryString=", "").Replace("%26", "&").Replace("%3d", "=");
}
Use
string x = HttpContext.Current.Items("qs_d").ToString();
Side note: I shortened you code some, as there is no need to first check if anything contains and if so, replace, just run replace, it will be faster
I think regular expressions might be able to accomplish this, if not then string manipulation is also a viable solution.
I need to turn the following inputs:
"http://open.thumbshots.org/image.pxf?url=www.party.com"
"http://www.xclicks.net/sc/ct.php?s=9971&l=http%3A//www.google.com/imgres%3F"
"http://whos.amung.us/pingjs/?k=yvybju40twbs&t=Mudswimmer%3A%20Spam%20%26%20Crap%3A%20Http%3AUniversity.com%3A%20No%20Animals%20Allowed..&c=c&y=htt"
into the following outputs:
"party.com"
"google.com"
"University.com"
I am not trying to get the host name of the URL, I want the the second domain, the one in the query string.
With everything that involves regular expressions there is a degree of uncertainty, for me at least, but giving your three inputs the following code works:
string[] urls = new string[]
{
"http://open.thumbshots.org/image.pxf?url=www.party.com",
"http://www.xclicks.net/sc/ct.php?s=9971&l=http%3A//www.google.com/imgres%3F",
"http://whos.amung.us/pingjs/?k=yvybju40twbs&t=Mudswimmer%3A%20Spam%20%26%20Crap%3A%20Http%3AUniversity.com%3A%20No%20Animals%20Allowed..&c=c&y=htt"
};
foreach (var url in urls)
{
var result = HttpUtility.ParseQueryString(new Uri(url, UriKind.Absolute).Query);
foreach (string item in result)
{
string value = result.GetValues(item).Single();
const string DomainNamePattern = "(?:www\\.|\\b)(?<domain>([a-z0-9]([-a-z0-9]*[a-z0-9])?\\.)+((a[cdefgilmnoqrstuwxz]|aero|arpa)|(b[abdefghijmnorstvwyz]|biz)|(cat|com|coop|c[acdfghiklmnorsuvxyz])|d[ejkmoz]|(e[ceghrstu]|edu)|f[ijkmor]|(g[abdefghilmnpqrstuwy]|gov)|h[kmnrtu]|(i[delmnoqrst]|info|int)|(j[emop]|jobs)|k[eghimnprwyz]|l[abcikrstuvy]|(m[acdghklmnopqrstuvwxyz]|mil|mobi|museum)|(n[acefgilopruz]|name|net)|(om|org)|(p[aefghklmnrstwy]|pro)|qa|r[eouw]|s[abcdeghijklmnortvyz]|(t[cdfghjklmnoprtvwz]|travel)|u[agkmsyz]|v[aceginu]|w[fs]|y[etu]|z[amw]))";
var match = Regex.Match(
value,
DomainNamePattern,
RegexOptions.IgnoreCase);
if (match.Success)
{
string domain = match.Groups["domain"].Value;
Console.WriteLine(domain);
}
}
}
The regular expression used was adapted from here.
If you run this you get the following output:
// party.com
// google.com
// University.com
If your link always contain the url querystring key then you can simple get this by
String url = Request.QueryString["url"].ToString();
This will retrun the value of url.
If I call
var nvc = HttpUtility.ParseQueryString("?foo=bar&baz=robots")
I get back a NameValueCollection where if I call ToString on it, I get back a query string.
var str = nvc.ToString(); //foo=bar&baz=robots....
If I create a new NameValueCollection, add stuff to it, and call ToString() on it, I don't get back a query string.
var nvc= new NameValueCollection();
nvc["foo"] = "bar";
var str = nvc.ToString(); //default for Object.ToString()
Also there doesn't seem to be a way to construct a NameValueCollection that acts as a query string editor. Is there one? If not, why? Being able to edit query strings is a pretty useful thing, but this functionality is totally hidden away in an obscure mode of some object most people don't even know exists.
This is done by the internal HttpValueCollection class, which inherits NameValueCollection and overrides ToString().
ParseQueryString() is the only public way to construct this class.
In the end, query strings are meant to be very simple. So, you can just do something like this:
Dictionary<string, string> dict = new Dictionary<string, string>();
dict.Add("somekey", "someval");
var querystring = string.Join("&", dict.Select(kv => HttpUtility.UrlEncode(kv.Key) + "=" + HttpUtility.UrlEncode(kv.Value)));
Completely untested of course. But yeah, a query string is name=value separated by ampersands. Is there something else you need to do?
I have an ASP.NET page which takes a number of parameters in the query string:
search.aspx?q=123&source=WebSearch
This would display the first page of search results. Now within the rendering of that page, I want to display a set of links that allow the user to jump to different pages within the search results. I can do this simply by append &page=1 or &page=2 etc.
Where it gets complicated is that I want to preserve the input query string from the original page for every parameter except the one that I'm trying to change. There may be other parameters in the url used by other components and the value I'm trying to replace may or may not already be defined:
search.aspx?q=123&source=WebSearch&page=1&Theme=Blue
In this case to generate a link to the next page of results, I want to change page=1 to page=2 while leaving the rest of the query string unchanged.
Is there a builtin way to do this, or do I need to do all of the string parsing/recombining manually?
You can't modify the QueryString directly as it is readonly. You will need to get the values, modify them, then put them back together. Try this:
var nameValues = HttpUtility.ParseQueryString(Request.QueryString.ToString());
nameValues.Set("page", "2");
string url = Request.Url.AbsolutePath;
string updatedQueryString = "?" + nameValues.ToString();
Response.Redirect(url + updatedQueryString);
The ParseQueryString method returns a NameValueCollection (actually it really returns a HttpValueCollection which encodes the results, as I mention in an answer to another question). You can then use the Set method to update a value. You can also use the Add method to add a new one, or Remove to remove a value. Finally, calling ToString() on the name NameValueCollection returns the name value pairs in a name1=value1&name2=value2 querystring ready format. Once you have that append it to the URL and redirect.
Alternately, you can add a new key, or modify an existing one, using the indexer:
nameValues["temp"] = "hello!"; // add "temp" if it didn't exist
nameValues["temp"] = "hello, world!"; // overwrite "temp"
nameValues.Remove("temp"); // can't remove via indexer
You may need to add a using System.Collections.Specialized; to make use of the NameValueCollection class.
You can do this without all the overhead of redirection (which is not inconsiderable). My personal preference is to work with a NameValueCollection which a querystring really is, but using reflection:
// reflect to readonly property
PropertyInfo isReadOnly = typeof(System.Collections.Specialized.NameValueCollection).GetProperty("IsReadOnly", BindingFlags.Instance | BindingFlags.NonPublic);
// make collection editable
isReadOnly.SetValue(this.Request.QueryString, false, null);
// remove
this.Request.QueryString.Remove("foo");
// modify
this.Request.QueryString.Set("bar", "123");
// make collection readonly again
isReadOnly.SetValue(this.Request.QueryString, true, null);
Using this QueryStringBuilder helper class, you can grab the current QueryString and call the Add method to change an existing key/value pair...
//before: "?id=123&page=1&sessionId=ABC"
string newQueryString = QueryString.Current.Add("page", "2");
//after: "?id=123&page=2&sessionId=ABC"
Use the URIBuilder Specifically the link textQuery property
I believe that does what you need.
This is pretty arbitrary, in .NET Core at least. And it all boils down to asp-all-route-data
Consider the following trivial example (taken from the "paginator" view model I use in virtually every project):
public class SomeViewModel
{
public Dictionary<string, string> NextPageLink(IQueryCollection query)
{
/*
* NOTE: how you derive the "2" is fully up to you
*/
return ParseQueryCollection(query, "page", "2");
}
Dictionary<string, string> ParseQueryCollection(IQueryCollection query, string replacementKey, string replacementValue)
{
var dict = new Dictionary<string, string>()
{
{ replacementKey, replacementValue }
};
foreach (var q in query)
{
if (!string.Equals(q.Key, replacementKey, StringComparison.OrdinalIgnoreCase))
{
dict.Add(q.Key, q.Value);
}
}
return dict;
}
}
Then to use in your view, simply pass the method the current request query collection from Context.Request:
<a asp-all-route-data="#Model.NextPageLink(Context.Request.Query)">Next</a>
Ruby on Rails controllers will automatically convert parameters to an array if they have a specific format, like so:
http://foo.com?x[]=1&x[]=5&x[]=bar
This would get converted into the following array:
['1','5','bar']
Is there any way I can do this with an ActionScript 3 HTTPService object, by using the request parameter? For example, It would be nice to do something like the following:
var s:HTTPService = new HTTPService();
s.request['x[]'] = 1;
s.request['x[]'] = 5;
s.request['x[]'] = 'bar';
However, that will simply overwrite each value, resulting in only the last value being sent. Anyone have a better idea? I know I could just append stuff to the query string, but I'd like to do it in the POST body.
I was working on this same problem as well. Fortunatly, Flex supports this out of the box.
Just use an Array for the field value:
var service:HTTPService = new HTTPService();
service.useProxy = true;
service.destination = "myservicet";
service.resultFormat = HTTPService.RESULT_FORMAT_XML;
var fields:Array = ["categories", "organisation"];
var params:Object = new Object();
params.q = "stackoverflow";
params.rows = 0;
params.facet = "true";
params["facet.field"] = fields;
service.send(params);
The HTTPService will convert this t0 the url parameters:
facet=true&q=stackoverflow&facet%2Efield=categories&facet%2Efield=organisation&rows=0
Hope this helps!
Added for more clarity. When there is only 1 argument in the array, do not pass the fields as an array. For some reason, flex will not send this to the http service
I usually do something like this...
var s:HTTPService = new HTTPService();
s.url = "http://foo.com";
s.method = "post";
// add listeners...
s.addEventListenser(ResultEvent.RESULT,function(event:ResultEvent){
mx.controls.Alert.show(event.result.toString());
});
// send the data...
s.send({
a: 1,
b: 5,
c: "bar"
});
which would result in the HTTP Get / POST of:
http://foo.com?a=1&b=5&c=bar
You could also just create an associative array and pass it to the HTTPService send method, that would be something like:
var postdata:Object = {};
postdata["a"] = 1;
postdata["b"] = 5;
postdata["c"] = "bar";
// s is the HTTPService from above...
s.send(postdata);
You mentioned that All POST parameters must have the same name.
Elements that have the same name will overwrite each other in an associative array.
However, I have dealt with calendar cells before, and all 31 cells belong to the Date category.
What I did was:
var params:Object = new Object;
for (var i:uint=0; i<31; i++){
params["Date"+(jj.toString())] = date[i];
}
HTTPService....etc.
HTTPService.send(params);
So, on the POST receiving side, it would be interpreted as Date0...Date31.
Don't know if this was what you wanted, and the post was so long ago.
Come to think about it.
Why don't you do an array push of all of the elements under the same index name?
However, this means you are sending an array to the receiving side.
If you are POST-ing this, how will this be URL-referenced?