I feel a bit absurd asking this but I can't find a way to get parameters for a get request at
/api/foo?sort=name for instance.
In the ApiController class, I gave a public string Get(). Putting Get(string sort) makes /api/foo a bad request. Request instance in the ApiController is of type System.Net.Http.HttpRequestMessage. It doesn't have a QueryString or Parameters property or anything.
The ApiController is designed to work without the HttpContext object (making it portable, and allowing it to be hosted outside of IIS).
You can still access the query string parameters, but it is done through the following property:
Request.GetQueryNameValuePairs()
Here's an example loop through all the values:
foreach (var parameter in Request.GetQueryNameValuePairs())
{
var key = parameter.Key;
var value = parameter.Value;
}
You could just use
HttpContext.Current.Request.QueryString
Here's an example that gets the querystring q from the request and uses it to query accounts:
var q = Request.GetQueryNameValuePairs().Where(nv => nv.Key =="q").Select(nv => nv.Value).FirstOrDefault();
if (q != null && q != string.Empty)
{
var result = accounts.Where(a=>a.Name.ToLower().StartsWith(q.ToLower()));
return result;
}
else
{
throw new Exception("Please specify a search query");
}
This can be called then like this:
url/api/Accounts?q=p
Get all querystring name/value pairs into a variable:
IEnumerable<KeyValuePair<string, string>> queryString = request.GetQueryNameValuePairs();
Then extract a specified querystring parameter
string value = queryString.Where(nv => nv.Key == "parameterNameGoesHere").Select(nv => nv.Value).FirstOrDefault();
You can also use the following
var value = request.GetQueryNameValuePairs().Where(m => m.Key == "paramName").SingleOrDefault().Value;
if we have a proper model for that request
for example
public class JustModel
{
public int Id {get;set;}
public int Age {gets;set;}
}
and query like this
/api/foo?Id=1&Age=10
You could just use [FromUri] attribute
For example
public IHttpActionResult GetAge([FromUri] JustModel model){}
Adding a default value does the job:
public string Get(string sort="")
You're trying to build an OData webservice? If so, just return an IQueryable, and the Web API will do the rest.
