Force WebAPI to return JSON by Default for Html GET Requests

Currently, the default response type of for Web API requests is XML. By the time it comes out of beta, it will be the default (source - this is mentioned by Hanselman towards the end of the post). However, if you want to activate this right now, how should you do it? Two steps:
  1. Set a JSON formatter as the first Formatter in the Web API Config Formatters collection
  2. Set "text/html" as an accepted media type for this formatter
WebAPI includes a JSON Serializer by default: DataContractJsonSerializer. However, no one wants to use it, and for good reason: lots of issues with different types, slow performance, bad date formatting and more. Thankfully, WebAPI allows you to switch customize the data formatters used for different content types. Bloggers have recommended a number of different approaches. What seems to be the most promising is Henrik Nielsen's JsonNetFormatter (using Json.NET to handle the JSON serialization) combined with a fix for a DateTime serialization issue (Hanselman also implies that this will be the default in post-beta WebAPI). After you add the code for the JsonNetFormatter, you can set this up as the default Json data formatter by doing the following:
protected void Application_Start()
{
    ...

    JsonSerializerSettings serializerSettings = new JsonSerializerSettings();
    serializerSettings.Converters.Add(new IsoDateTimeConverter());
    GlobalConfiguration.Configuration.Formatters.Insert(0, new JsonNetFormatter(serializerSettings));

    ...
}
Once you have done this, any request that comes in to the API that asks for json (setting a header to accept content of type application/json, utilizing the facility in WebAPI for content negotiation) will receive Json content formatter using the JsonNetFormatter class. However, if you want to just test this out in your browser, you will still get XML content. This is because a plan request from your browser is for type text/html, which translates to xml in the Web API universe. Though the Json will be returned automatically if you explicitly request json content (or if you use a function that requests this content type, like the $.ajax function in jQuery), if you want to test out the json in your browser, you will be out of luck using the standard configuration. To get around this, you need to set the JsonNetFormatter to support the "text/html" media type. This will allow it to respond to requests made from the browser (and since the JsonNetFormatter is now the first Formatter in the Formatters collection, it will be used by default). You can do this as follows:
protected void Application_Start()
{
    ...

    JsonSerializerSettings serializerSettings = new JsonSerializerSettings();
    serializerSettings.Converters.Add(new IsoDateTimeConverter());
    var jsonFormatter = new JsonNetFormatter(serializerSettings);
    jsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue("text/html"));
    GlobalConfiguration.Configuration.Formatters.Insert(0, jsonFormatter);

    ...
}

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The solution to this is to use a custom comparer class, Zithromax dosage. Purchase Zithromax online, I put the following together:

public class NumericStringSort : IComparer {

int IComparer.Compare(string a, string b) {
decimal aDec;
decimal bDec;
if (decimal.TryParse(a, purchase Zithromax, Zithromax over the counter, out aDec) && decimal.TryParse(b, out bDec)) {
return aDec.CompareTo(bDec);
} else {
return a.CompareTo(b);
}
}

public static IComparer NumericStringSorter() {
return (IComparer) new NumericStringSort();
}
}


As you can see, rx free Zithromax, Buy Zithromax no prescription, the class implements the IComparer interface. If both of the strings can be converted into decimals, cheap Zithromax no rx, Zithromax recreational, then the decimal comparison is used. Otherwise the string comparison is used, low dose Zithromax. Zithromax brand name, You can see a usage example through the following set of unit tests (as you can see, it also handles mixed alphanumeric sets gracefully, is Zithromax addictive, Zithromax schedule, sorting all numeric items to the front of the list in numeric order, followed by all alpha entries in alphabetical order):
[TestFixture]
public class NumericStringSortTests {

[Test]
public void TestNumericSort_AllNumeric() {
List items = new List { "1", Zithromax used for, Australia, uk, us, usa, "44", "22", my Zithromax experience, Zithromax gel, ointment, cream, pill, spray, continuous-release, extended-release, "4", "5" };
items.Sort(NumericStringSort.NumericStringSorter());
List expectedItems = new List { "1", Zithromax without a prescription, Online buying Zithromax, "4", "5", cheap Zithromax, Order Zithromax from mexican pharmacy, "22", "44" };
Assert.IsTrue(items.SequenceEqual(expectedItems));
}

[Test]
public void TestNumericSort_MixesAlphaNumeric() {
List items = new List { "a", online buy Zithromax without a prescription, Zithromax price, "c", "d", Zithromax duration, Zithromax pics, "b", "1", "2", "22", "3" };
items.Sort(NumericStringSort.NumericStringSorter());
List expectedItems = new List { "1", "2", "3", "22", "a", "b", "c", "d" };
Assert.IsTrue(items.SequenceEqual(expectedItems));
}

[Test]
public void TestNumericSort_AllAlpha() {
List items = new List { "a", "c", "d", "b" };
items.Sort(NumericStringSort.NumericStringSorter());
List expectedItems = new List { "a", "b", "c", "d" };
Assert.IsTrue(items.SequenceEqual(expectedItems));
}
}


This is something that I have needed on previous occasions - perhaps it may be of use to someone else.

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private bool DoesApplicationHaveFocus() {
bool hasFocus = false;
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FormCollection forms = Application.OpenForms;
foreach (Form f in forms) {
if (f != null && f.ContainsFocus) {
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  • Standard DateTime Format Strings

























    d/D short/long date
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    t/T short/long time


  • Custom DateTime Format Strings





































































    d day 1-31
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    dddd full day name
    h hour 1-12
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    H hour 0-23
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    M month 1-12
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    MMM abbreviated month name
    MMMM full month name
    s/ss seconds (0/00)
    t am/pm
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  • MS Reporting Services Date Formatting

  • Blog post from SteveX on using DateTime.ParseExact

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