public OrderParameters ParseQuery(NameValueCollection queryStrings)
{
if (queryStrings == null || queryStrings.Count == 0)
{
return(null);
}
var orderParams = new OrderParameters();
orderParams.CustomerId = queryStrings["CustomerId"];
if (DateTime.TryParse(queryStrings["dateFrom"], out var fromDateTime))
{
orderParams.DateFrom = (DateTime?)fromDateTime;
}
else
{
orderParams.DateFrom = null;
}
if (DateTime.TryParse(queryStrings["dateTo"], out var toDateTime))
{
orderParams.DateFrom = (DateTime?)toDateTime;
}
else
{
orderParams.DateFrom = null;
}
if (int.TryParse(queryStrings["skip"], out var skipRes))
{
orderParams.Skip = skipRes;
}
else
{
orderParams.Skip = null;
}
if (int.TryParse(queryStrings["take"], out var takeRes))
{
orderParams.Skip = takeRes;
}
else
{
orderParams.Skip = null;
}
return(orderParams);
}
public OrderParameters ParseBody(Stream inputStream)
{
using (var reader = new StreamReader(inputStream))
{
var data = reader.ReadToEnd().Split('&');
var orderParams = new OrderParameters
{
CustomerId = GetStringParameter("customerId", data),
DateFrom = GetDateTimeParameter("dateFrom", data),
DateTo = GetDateTimeParameter("dateTo", data),
Skip = GetIntParameter("skip", data),
Take = GetIntParameter("take", data)
};
return(orderParams);
}
}
public void Listen()
{
var listener = new HttpListener();
listener.Prefixes.Add("http://+:55177/");
listener.IgnoreWriteExceptions = true;
listener.Start();
do
{
var context = listener.GetContext();
var request = context.Request;
var response = context.Response;
string acceptType;
var orderParams = new OrderParameters();
if (request.HttpMethod == "POST" && request.InputStream != null)
{
orderParams = _parser.ParseBody(request.InputStream);
}
else
{
var dataFromQuery = HttpUtility.ParseQueryString(request.Url.Query);
orderParams = _parser.ParseQuery(dataFromQuery);
}
if ((request.AcceptTypes == null) || (!request.AcceptTypes.Any()))
{
acceptType = "unknown";
}
else
{
acceptType = request.AcceptTypes.FirstOrDefault();
}
var data = GetData(orderParams);
SendResponse(acceptType, data, response);
} while (true);
}
private List <OrderFields> GetData(OrderParameters orderParams)
{
DateTime dateFrom, dateTo;
var db = new Northwind();
dateFrom = orderParams.DateFrom == null ? DateTime.MinValue : orderParams.DateFrom.Value;
dateTo = orderParams.DateTo == null? DateTime.MaxValue: orderParams.DateTo.Value;
var orderInfo = new List <OrderFields>();
if (orderParams.Take != null && orderParams.Skip != null)
{
var query = db.Orders.Include(o => o.Customer)
.Skip(orderParams.Skip.Value)
.Take(orderParams.Take.Value)
.Where(o => o.OrderDate > dateFrom && o.OrderDate < dateTo)
.OrderBy(o => o.OrderID)
.Select(o => new OrderFields
{
Customer = o.Customer.CompanyName,
OrderDate = o.OrderDate,
Freight = o.Freight,
ShipCountry = o.ShipCountry,
ShipName = o.ShipName
});
orderInfo = query.ToList();
}
else
{
if (orderParams.Take == null && orderParams.Skip.HasValue)
{
var query = db.Orders.Include(o => o.Customer)
.Skip(orderParams.Skip.Value)
.Where(o => o.OrderDate > dateFrom && o.OrderDate < dateTo)
.OrderBy(o => o.OrderID)
.Select(o => new OrderFields
{
Customer = o.Customer.CompanyName,
OrderDate = o.OrderDate,
Freight = o.Freight,
ShipCountry = o.ShipCountry,
ShipName = o.ShipName
});
orderInfo = query.ToList();
}
else
{
if (orderParams.Skip == null && orderParams.Take.HasValue)
{
var query = db.Orders.Include(o => o.Customer)
.Take(orderParams.Take.Value)
.Where(o => o.OrderDate > dateFrom && o.OrderDate < dateTo)
.OrderBy(o => o.OrderID)
.Select(o => new OrderFields
{
Customer = o.Customer.CompanyName,
OrderDate = o.OrderDate,
Freight = o.Freight,
ShipCountry = o.ShipCountry,
ShipName = o.ShipName
});
orderInfo = query.ToList();
}
else
{
var query = db.Orders.Include(o => o.Customer)
.Where(o => o.OrderDate > dateFrom && o.OrderDate < dateTo)
.OrderBy(o => o.OrderID)
.Select(o => new OrderFields
{
Customer = o.Customer.CompanyName,
OrderDate = o.OrderDate,
Freight = o.Freight,
ShipCountry = o.ShipCountry,
ShipName = o.ShipName
});
orderInfo = query.ToList();
}
}
}
return(orderInfo);
}
