Within my C# middle tier, I have a scheduled task that runs certain business logic every minute and then sends push notifications to iOS and Android devices accordingly. I use Urban Airship to facilitate the push notices which means that, in my code, I am just calling their API and then they handle the actual pushing to various devices. Here is what that code looks like:
public static void SendNotice(UaMessageModel messages)
{
var audience = new NameValueCollection
{
{"alias", string.Join(", ", messages.UserIds)}
};
var notification = new NameValueCollection
{
{"alert", messages.Message}
};
var pushNotice = new NameValueCollection
{
{"audience", new JavaScriptSerializer().Serialize(audience)},
{"notification", new JavaScriptSerializer().Serialize(notification)}
};
//ToDo: remove "validate" from URL when done testing.
Utilities.PostWebRequest("https://go.urbanairship.com/api/push/validate/", "Basic XXXXXXXXX", pushNotice, "application/vnd.urbanairship+json; version=3;");
}
public class UaMessageModel
{
public List<int> UserIds { get; set; }
public string Message { get; set; }
}
When I put a break point at Utilities.PostWebRequest
and hover over pushNotice
, I only see the keys of the pushNotice
NameValueCollection, but no values. Am I constructing this NameValueCollection incorrectly?
Whether pushNotice
is constructed correctly or not, I still don't get any response from my WebClient
post. This method works when I use just a simple, flat post object. Here is that code:
public static dynamic PostWebRequest(string url, string token, NameValueCollection obj, string accept)
{
using (var wc = new WebClient())
{
wc.Headers.Add("Authorization", token);
wc.Headers.Add("Accept", accept);
return GetObjectFromJson(Encoding.UTF8.GetString(wc.UploadValues(url, "POST", obj)));
}
}
Thanks in advance.
NameValueCollection is not a Dictionary. The JavascriptSerializer will not serialize it as you expect. To get your expected result you should convert the NameValueCollection to a Dictionary.
NameValueCollection audience = new NameValueCollection();
Data.Add("alias", "foobar");
Data.Add("alias", "foobar2");
To output the values along with the keys you need to convert the NameValueCollection to a Dictionary like below:
Dictionary<string, string> audienceDictionary = audience.AllKeys.ToDictionary(k => k, k => source[k]));
Our you can just use a Dictionary in your code instead of a NameValueCollection:
Dictionary<string, string> audience = new Dictionary<string, string>();
audience.Add("alias", string.Join(", ", messages.UserIds));
Dictionary<string, string> notification = new Dictionary<string, string>();
notification.Add("alert", messages.Message);
Dictionary<string, string> pushNotice = new Dictionary<string, string>();
pushNotice.Add("audience", new JavaScriptSerializer().Serialize(audience));
pushNotice.Add("notification", new JavaScriptSerializer().Serialize(notification));
Edit:
Also take a look at this answer: https://stackoverflow.com/a/7003815/2488939
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