Develop Reference

Json.Net convert complex querystring to JsonString

I am implementing a utility method to convert queryString to JsonString.
My code is as follows:
public static string GetJsonStringFromQueryString(string queryString)
{
var nvs = HttpUtility.ParseQueryString(queryString);
var dict = nvs.AllKeys.ToDictionary(k => k, k => nvs[k]);
return JsonConvert.SerializeObject(dict, new KeyValuePairConverter());
}
when I test with the following code:
var postString = "product[description]=GreatStuff" +
"&product[extra_info]=Extra";
string json = JsonHelper<Product>.GetJsonStringFromQueryString(postString);
I got
{
"product[description]":"GreatStuff",
"product[extra_info]":"Extra",
...
}
what I would like to get is
{
"product":{
"description": "GreatStuff",
"extra_info" : "Extra",
...
}
}
How can I achieve this without using System.Web.Script Assembly? (I am on Xamarin and have no access to that library)

You need to remove the product[key] (excepting the product property name or key...) part to get what you want...
That is, you should pre-process your query string before parsing it this way:
string queryString = "product[description]=GreatStuff" +
"&product[extra_info]=Extra";
var queryStringCollection = HttpUtility.ParseQueryString(queryString);
var cleanQueryStringDictionary = queryStringCollection.AllKeys
.ToDictionary
(
key => key.Replace("product[", string.Empty).Replace("]", string.Empty),
key => queryStringCollection[key]
);
var holder = new { product = cleanQueryStringDictionary };
string jsonText = JsonConvert.SerializeObject(holder);

Compare Dictionary Key of type string to another string in C#

I'm actually trying to check if a string is equal to any of the key's in my Dictionary object.
Here is what I have done so far:
using (var oStreamReader = new StreamReader(path))
{
Dictionary<String, String> typeNames = new Dictionary<string, string>();
typeNames.Add("Kind","nvarchar(1000)");
typeNames.Add("Name","nvarchar(1000)");
DataTable oDataTable = new DataTable();
var headLine = oStreamReader.ReadLine().Trim().Replace("\"", "");
var columnNames = headLine.Split(new[] { ';' });
String[] oStreamDataValues;
/*
*create DataTable header with specific datatypes and names
*/
int countCol = 0;
foreach (string readColumn in columnNames)
{
if ((readColumn.ToString().Replace("\"", "").CompareTo(typeNames) == true))
{
// this comparison doesn't work
}
}
}

I am not quite sure what exactly you are trying to achieve. If you have a C# dictonary you can use linq to check for values that match the required value, e.g.
string valueToCompare = "Value to match";
Dictionary<string, string> dict = new Dictionary<string, string>
{
{"Key 1", "A value"},
{"Key 2", "Another value"}
};
bool found= dict.Values
.Any(value
=>
value.Equals(valueToCompare,
StringComparison.CurrentCultureIgnoreCase)
);

Since you want check if exist an entry in your Dictionary that as the same key of one of the values in your columnNames object I suggest you to use ContainsKey method

Dictionary<string, string> d = new Dictionary<string, string>();
string keyvalue;
if (d.ContainsKey("value to find"))
{
if (d.TryGetValue("value to find", out keyvalue))
{
//// here keyvalue variable has the value
}
else
{
///value is null or throws exception
}
}
else
{
////key no exists
}

I have solved this (by inspiration of Paul Houlston and Thomas Lielacher)
string headLine = oStreamReader.ReadLine().Trim().Replace("\"", "");
string columnNames = headLine.Split(new[] { ';' });
foreach (string readColumn in columnNames)
{
if (typeNames.Keys.Contains(readColumn, StringComparer.CurrentCultureIgnoreCase) == true)
{
DataColumn oDataColumn = new DataColumn(readColumn,typeof(System.String));
oDataTable.Columns.Add(oDataColumn);
}
}

Validate if URL exist in List using linq

I Have a object List and I need to validate to check if a given url exist in the list. Think LINQ will be a good approach, but I'm not quite sure how to go about it.
var url1 = new WhiteListItem() {Url = "*.aaaaa.com/*"};
var url2 = new WhiteListItem() { Url = "www.bbbbb.com/*" };
var url3 = new WhiteListItem() { Url = "www.ccccc.com" };
var url4 = new WhiteListItem() { Url = "www.ddddd.com/ddddddd" };
var validUrls = new List<WhiteListItem> {url1, url2, url3, url4};
Just to clarify, I'm trying to get the following results for given url:
True - www.aaaaa.com/something?aaa=something/something
True - mobi.aaaaa.com/Something
False - aaaaa.com (Because no sub-domain present)
True - www.bbbbb.com/something/something
True - www.bbbbb.com
False - mobi.bbbbb.com (Because only www sub-domain allowed)
I Think you get the picture. Please help or just point me in a correct direction. Code examples will be highly appreciated.
#stovroz, thanx for coming back to me. I thought I should do something like that, here is my function: Please let me know if you see any loopholes. Not sure if the use of a stringbuilder was an overkill?
And Then 1 last question how can I say that "/" can be present at the end but not permitted to pass.
private static Regex CreateRegularExpression(string urlString)
{
var sb = new StringBuilder(urlString.Trim());
sb.Replace(".", #"\.");
if (sb.ToString().EndsWith(#"/"))
{
sb.Append("?");
}
if (sb.ToString().EndsWith(#"/*"))
{
sb.Insert(sb.Length - 1, '.');
}
if (sb.ToString().IndexOf("https://", StringComparison.Ordinal) >= 0)
{
sb.Replace("https://", #"\bhttps://");
}
else if (sb.ToString().IndexOf("http://", StringComparison.Ordinal) >= 0)
{
sb.Replace("http://", #"\bhttp://");
}
else
{
sb = new StringBuilder(Config.AllowedProtocolRegExp + sb.ToString());
}
sb.Replace(#"://*\.", #"://[\x2DA-Za-z0-9]*\.");
return new Regex(sb.ToString());
}

I think it would be better if you could express your whitelist rules as regular expressions, either as a single composite regular expression, or as a list of separate expressions and checking if any match, something like:
var whitelist = new [] {#".*\.aaaaa\.com/*.", #"www.bbbbb.com/.*"};
var list = new [] { "mobi.aaaaa.com/Something", "mobi.bbbbb.com/" };
var matches = list.Where(x => whitelist.Any(y => Regex.IsMatch(x, y)));
Update:
As you've got a large number of patters to match on which are already in wildcard syntax, you can convert those to Regex syntax first by using the following function:
public string WildcardToRegex(string pattern)
{
return "^" + Regex.Escape(pattern).
Replace("\\*", ".*").
Replace("\\?", ".") + "$";
}
(from http://www.codeproject.com/Articles/11556/Converting-Wildcards-to-Regexes)
so:
var wildcardWhitelist = new [] { "*.aaaaa.com/*", "www.bbbbb.com/*" };
var regexWhitelist = wildcardWhitelist.Select(x => WildcardToRegex(x));
var list = new [] { "mobi.aaaaa.com/Something", "mobi.bbbbb.com/" };
var matches = list.Where(x => regexWhitelist.Any(y => Regex.IsMatch(x, y)));

var urls = new List<WhiteListItem>
{
new WhiteListItem() {Url = "*.aaaaa.com/*"},
new WhiteListItem() { Url = "www.bbbbb.com/*" },
new WhiteListItem() { Url = "www.ccccc.com" },
new WhiteListItem() { Url = "www.ddddd.com/ddddddd" };
};
var validatedUrls = urls.Select(u => new
{
// here you can use Regular Expression pattern to validate your Urls
//or you can use your custom method
IsPassed = Regex.IsMatch("",u.Url),
Url = u.Url,
}).ToList();
var goodUrls = validatedUrls.Where(u=> u.IsPassed).Select(u=>u.Url);
var badUrls = validatedUrls.Where(u=> !u.IsPassed).Select(u=>u.Url);

How to Sort NameValue Collection and Store it in a string

Here I am storing two set of querystring parameters into two different namevalue collection. The querystring parameter order may vary so I just want to sort the order and then I need to store namevalue collection to a string.
Updated Code :
string url1 = #"http://www.somewebsitesampletest.com/dcs7o?data=142248494&dcp=smre&nparam=4567P&email=xxx.com";
string url2 = #"http://www.somewebsitesampletest.com/dcs7o?dcp=smre&data=142248494&email=xxx.com&nparam=4567P";
var NameValueCollection1 = HttpUtility.ParseQueryString(url1);
var NameValueCollection2 = HttpUtility.ParseQueryString(url2);
ExpectedResult:
After Sorting and converting to string the result should look like the below one
string query1 = "data=142248494&dcp=smre&email=xxx.com&nparam=4567P";
string query2 = "data=142248494&dcp=smre&email=xxx.com&nparam=4567P";

Here's a solution using Linq.
Basically it changes the NameValueCollection to an IEnumerable of the keys using Cast<T>, then the rest is fairly self explanatory.
public string GetSortedQueryString(string url)
{
var queryString = HttpUtility.ParseQueryString(url);
// Ignore null keys (caused by your ?& at the start of the query string
var orderedKeys = queryString.Cast<string>().Where(k => k != null).OrderBy(k => k);
return string.Join("&", orderedKeys.Select(k => string.Format("{0}={1}", k, queryString[k])));
}
Results for your URLs would be:
data=142248494&dcp=smre&email=xxx.com&nparam=4567P
data=142248494&dcp=smre&email=xxx.com&nparam=4567P
Email comes before nparam, unlike your expected solution (I'm assuming that was a mistake).

use LINQ with a Dictionary and a list of KeyValuePair :
string url1 = #"http://www.somewebsitesampletest.com/dcs7o?&data=142248494&dcp=smre&nparam=4567P&email=xxx.com";
string query1 ="";
Dictionary<String, String> paramDict = new Dictionary<string, string>();
var query = from match in urlString.Split('?').Where(m => m.Contains('='))
.SelectMany(pr => pr.Split('&'))
where match.Contains('=')
select new KeyValuePair<string, String>(
match.Split('=')[0],
match.Split('=')[1]);
query.ToList().ForEach(kvp => paramDict.Add(kvp.Key, kvp.Value));
var List<KeyValuePair<string, string>> paramList = paramDict.ToList();
paramList.Sort();
foreach (KeyValuePair<string, int> pair in list)
{
query1+=pair.Key+"="+pair.Value+"&";
}
query1=query1.TrimEnd('&');

I made this fiddle because I needed to sort querystring values in order to properly compare URIs: (H/T to Jacob's answer)
https://dotnetfiddle.net/eEhkNk
This preserves duplicate keys:
public static string[] QueryStringOmissions = new string[] { "b" };
public static NameValueCollection SortAndRemove(NameValueCollection collection)
{
var orderedKeys = collection.Cast<string>().Where(k => k != null).OrderBy(k => k);
var newCollection = HttpUtility.ParseQueryString(String.Empty);
foreach(var key in orderedKeys)
{
if (!QueryStringOmissions.Contains(key))
{
foreach(var val in collection.GetValues(key).Select(x => x).OrderBy(x => x).ToArray())
{
newCollection.Add(key, val);
}
}
}
return newCollection;
}

filtering a tuple based on item 3 in the tuple

I need to print a list of countries that use dollars as a currency from a web service.
the data comes form a class called country services which contains this tuple:
public static IEnumerable<Tuple<string, string, string, string>> GetCountryData()
{
var countryService = new CountryServiceProxy.country();
var xmlStringResult = countryService.GetCurrencies();
var result = new List<Tuple<string, string, string, string>>();
var xPathDoc = new XPathDocument(new XmlTextReader(new StringReader(xmlStringResult)));
var navigator = xPathDoc.CreateNavigator();
var nodes = navigator.Select("//Table");
var nodeNames = new[] {"Name", "CountryCode", "Currency", "CurrencyCode"};
while (nodes.MoveNext())
{
var nodeValues = new[] {string.Empty, string.Empty, string.Empty, string.Empty};
for (var i = 0; i < nodeNames.Length; i++)
{
var node = nodes.Current.SelectSingleNode(nodeNames[i]);
if (node != null)
{
nodeValues[i] = node.Value;
}
}
result.Add(new Tuple<string, string, string, string>(nodeValues[0], nodeValues[1], nodeValues[2], nodeValues[3]));
}
return result;
}
I need to call that method and use it to print out a list with countries that use dollars:
private static IEnumerable<Country> Excercise4()
{
// var data = CountryService.GetCountryData().Where(x => x.Item3.Contains("Dollar"));
// ////var data = CountryService.GetCountryData().Where(x => x.Item3 == "Dollar");
// //Console.WriteLine(data);
return new List<Country>
{
new Country("da", "C1", "$", "Dollar"),
new Country("Country2", "C3", "$", "Dollar")
};
}
so far my method looks like this. i cant seem to figure out how to print out the tuple , havent used tuple before.
my write method is as follows:
ConsoleHelper.PrintCountryResults(Excercise4(), "Return a list of Country objects who's currency is Dollar");
ConsoleHelper.Pause(PauseMessage);
and the console helper class looks like this :
public static void PrintCountryResults(IEnumerable<Country> results, string title)
{
PrintHeader(title);
foreach (var result in results)
{
Console.WriteLine("{0, -30}{1, -5}{2, -15}{3, -5}", result.CountryName, result.CountryCode, result.CurrencyName, result.CurrencyCode);
}
}
any help would be appreciated as i said havent used tuple before first try at them ..
Thanx

You can filter the properties of the tuple by referencing the ItemX property with X being the 1-based index of the property that you're interested in. in you case if the currency is the third item, filtering the tuples would look like
var countriesUsingDollarAsACurrency = GetCountryData().Where(tuple => tuple.Item3 == "Dollar");