Develop Reference

How to use lambda expression to access correct data type?

I am using lambda expression to access values with data type, but the problem I have data type for Time as Time(7) on my local database and using Entity Framework. On my model this data type is define as DateTime.
How do I now access this data type to be time?
This is my code:
public List GetIncident_Details()
{
Entities incident = new Entities();
List result = new List();
var c_incident = incident.Incident_Template.Select(c => c).ToList();
if (c_incident != null && c_incident.Count() > 0)
{
foreach (var cData in c_incident)
{
Incident_DropDown model = new Incident_DropDown();
model.Title = cData.Title;
model.Description = cData.Description;
model.Date_Occurred = cData.Date_Occurred;
// How do I change this to have access?
// It's complaining about the data type object being set to a string?
model.Time = cData.Time;
model.Assignment_Group = cData.Assignment_Group;
model.Reported_CI = cData.Reported_CI;
result.Add(model);
}
}
return result;
}
public class Incident_DropDown
{
public string Title { get; set; }
public string Description { get; set; }
public string Date_Occurred { get; set; }
public DateTime Time { get; set; } // Time
public string Assignment_Group { get; set; }
public string Reported_CI { get; set; }
}

Took some advice from #alexey-rumyantsev, then had to test my code by interrogating model data type for Time it was Date Time, then change to Timespan. While testing this data type compare to my local database record and it was passing correct vales when debugging.
// Model name
public class Incident_DropDown
{
public string Title { get; set; }
public string Description { get; set; }
public string Date_Occured { get; set; }
public TimeSpan Time { get; set; } // had to change to work
public string Assignment_Group { get; set; }
public string Reported_CI { get; set; }
}
// Controller
public List<Incident_DropDown> GetIncident_Details()
{
Entities incident = new Entities();
List<Incident_DropDown> result = new List<Incident_DropDown>();
var c_incident = incident.Incident_Template.Select(c => c).ToList();
if (c_incident != null && c_incident.Count() > 0)
{
foreach (var cData in c_incident)
{
Incident_DropDown model = new Incident_DropDown();
model.Title = cData.Title;
model.Description = cData.Description;
model.Date_Occured = cData.Date_Occured;
model.Time = cData.Time; // This here enable to pass correct time as per database record
model.Assignment_Group = cData.Assignment_Group;
model.Reported_CI = cData.Reported_CI;
result.Add(model);
}
}
return result;
}

Why am I getting the last element of the list?

Here is the GET REQUEST
var destname = textBox1.Text;
var client1 = new RestClient("https://skyscanner-skyscanner-flight-search-v1.p.rapidapi.com/apiservices/autosuggest/v1.0/UK/GBP/en-GB/?query=" + destname);
var request1 = new RestRequest(Method.GET);
request1.AddHeader("x-rapidapi-key", "");
request1.AddHeader("x-rapidapi-host", "skyscanner-skyscanner-flight-search-v1.p.rapidapi.com");
IRestResponse response1 = client1.Execute(request1);
var results = JsonConvert.DeserializeObject<DestinationName>(response1.Content);
And here is the classes
public partial class Place1
{
public string PlaceId { get; set; }
public string PlaceName { get; set; }
public string CountryId { get; set; }
public string RegionId { get; set; }
public string CityId { get; set; }
public string CountryName { get; set; }
}
public partial class DestinationName
{
public List<Place1> Places { get; set; }
}
When I do what is below I should be getting ES-sky which is the first element of the list but for some reason it gives me the last element of the list.
foreach (var a in results.Places)
{
label1.Text = a.PlaceId;
}
Here is the list
ES-sky
BCN-sky
ALC-sky
AGP-sky
MAD-sky
PMI-sky
IBZ-sky
TENE-sky
TFS-sky
TFN-sky
How would I adapt the code so that my output is ES-sky and not TFN-sky.

You are looping through the list, every time its writing value to "label1.Text". Use SingleOrDefault()/FirstOrDefault(). Dont use foreach loop.
Example:
var firstValue=results.Places.FirstOrDefault();
label1.Text = firstValue.PlaceId;

Instead of iterating through the loop here:
foreach (var a in results.Places)
{
label1.Text = a.PlaceId;
}
Just get the first value with appropriate validation:
if(results.Places != null && results.Places.Any())
{
var result = results.Places.First();
label1.Text = a.PlaceId;
}

You can bind only first place data in list from server side and get it on client side OR
bind FirstorDefault method to get first place data from list in client side.

C# populating class array from xml linq results in FormatException

I'm getting a FormatException error "Input string was not in a correct format." error...
Employee class is all strings except the Status(int), Type(int) and Displayed(bool)
public partial class Version2 : System.Web.UI.Page {
private Employee[] Employees;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
XDocument xdoc = XDocument.Load(Server.MapPath("~/")+ "V2Employees.xml");
IEnumerable<XElement> emps = xdoc.Root.Descendants();
Employees = emps.Select(x => new Employee()
{
Employee_ID = x.Attribute("id").Value,
First_Name = x.Element("First_Name").Value,
Last_Name = x.Element("Last_Name").Value,
Classification_Group = x.Element("Classification_Group").Value,
Classification_Level = x.Element("Classification_Level").Value,
Postion_Number = x.Element("Postion_Number").Value,
English_Title = x.Element("English_Title").Value,
French_Title = x.Element("French_Title").Value,
Location = x.Element("Location").Value,
Language = x.Element("Language").Value,
Department_ID = x.Element("Department_ID").Value,
Status = int.Parse(x.Element("Status").ToString()),
Type = int.Parse(x.Element("Type").ToString()),
Displayed = false}).ToArray();
}
Example XML going in:
<?xml version="1.0" encoding="utf-8" ?>
<employees>
<employee id="1">
<First_Name>Jane</First_Name>
<Last_Name>Doe</Last_Name>
<Classification_Group>AA</Classification_Group>
<Classification_Level>02</Classification_Level>
<Postion_Number>12345</Postion_Number>
<English_Title>Bob</English_Title>
<French_Title></French_Title>
<Location>Null Island</Location>
<Language>English</Language>
<Department_ID>000001</Department_ID>
<Status>1</Status>
<Type>4</Type>
</employee>
</employees>

By calling ToString on an XElement, you're ending up with the whole element as a string, e.g.
<Status>4</Status>
... and trying to parse that as an int. I would strongly suggest:
Just using the Value property or a cast to string when you want the value of an element as a string (no need for a ToString call afterwards)
Using a cast to int when you want to convert an XElement's value to an integer
I would write your Select as:
// Property names adjusted to .NET naming conventions, type of
// PositionNumber changed to an int.
Employees = emps.Select(x => new Employee
{
EmployeeId = (string) x.Attribute("id"),
FirstName = (string) x.Element("First_Name"),
LastName = (string) x.Element("Last_Name"),
ClassificationGroup = (string) x.Element("Classification_Group"),
ClassificationLevel = (string) x.Element("Classification_Level"),
PositionNumber = (int) x.Element("Postion_Number"),
EnglishTitle = (string) x.Element("English_Title"),
FrenchTitle = (string) x.Element("French_Title"),
Location = (string) x.Element("Location"),
Language = (string) x.Element("Language"),
DepartmentId = (string) x.Element("Department_ID"),
Status = (int) x.Element("Status"),
Type = (int) x.Element("Type"),
Displayed = false
}
You might want to use .Value instead of the cast to string, which will mean you get a NullReferenceException if the element is missing the appropriate sub-element. You may want to use the above form instead, then have a Validate method to check that it has all the required information - that would probably allow you to report errors more clearly:
You could say which property is missing rather than just getting an exception
You could report multiple missing properties in a single error message

See code below. The fix was : xdoc.Root.Descendants("employee"); I also made other improvements
public class Employee
{
static Employee[] Employees = null;
const string FILENAME = #"c:\temp\test.xml";
public static Boolean IsPostBack = false;
string Employee_ID { get; set; }
string First_Name { get; set; }
string Last_Name { get; set; }
string Classification_Group { get; set; }
string Classification_Level { get; set; }
string Postion_Number { get; set; }
string English_Title { get; set; }
string French_Title { get; set; }
string Location { get; set; }
string Language { get; set; }
string Department_ID { get; set; }
int Status { get; set; }
int Type { get; set; }
Boolean Displayed { get; set; }
//protected void Page_Load(object sender, EventArgs e)
public void Page_Load()
{
if (!IsPostBack)
{
XDocument xdoc = XDocument.Load(FILENAME);
IEnumerable<XElement> emps = xdoc.Root.Descendants("employee");
Employees = emps.Select(x => new Employee()
{
Employee_ID = (string)x.Attribute("id"),
First_Name = (string)x.Element("First_Name"),
Last_Name = (string)x.Element("Last_Name"),
Classification_Group = (string)x.Element("Classification_Group"),
Classification_Level = (string)x.Element("Classification_Level"),
Postion_Number = (string)x.Element("Postion_Number"),
English_Title = (string)x.Element("English_Title"),
French_Title = (string)x.Element("French_Title"),
Location = (string)x.Element("Location"),
Language = (string)x.Element("Language"),
Department_ID = (string)x.Element("Department_ID"),
Status = (int)x.Element("Status"),
Type = (int)x.Element("Type"),
Displayed = false
}).ToArray();
}
}
}

RESTful - WCF - Object reference not set to an instance of an object

I created a simple RESTful application in WCF(c#). When I'm populating using (GET) I've received this error
"Object reference not set to an instance of an object".
I received the error in the part of target.DocumentLines[0].itemCode = "";.
Here's my code:
public PRRequestData[] getAllPR()
{
List<PRRequestData> list = new List<PRRequestData>();
try
{
string sqlSelect = "SELECT DocEntry, Comments, ReqDate FROM OPRQ";
APP.strCommand = sqlSelect;
DataTable dt = new DataTable();
dt = APP.Ds.Tables[0];
foreach (DataRow row in dt.Rows)
{
// Person target = Activator.CreateInstance();
PRRequestData target = new PRRequestData();
target.requiredDate = row["ReqDate"].ToString();
target.remarks = row["Comments"].ToString();
target.docEntry = row["DocEntry"].ToString();
// DataColumnAttribute.Bind(row,target);
sqlSelect = "SELECT ItemCode, Quantity, Price, VendorNum, TaxCode FROM PRQ1 WHERE DocEntry = '" + row["DocEntry"].ToString() + "' ";
APP.strCommand = sqlSelect;
for (var i = 0; i < APP.Ds.Tables[0].Rows.Count; i++)
{
target.DocumentLines[0].itemCode = "";
}
list.Add(target);
}
return list.ToArray();
}
catch (Exception e)
{
e.ToString();
}
return list.ToArray();
Here's my DataContract source code also:
[DataContract(Namespace = "")]
public class PRRequestData
{
[DataMember]
public string docEntry { get; set; }
[DataMember]
public string remarks { get; set; }
[DataMember]
public string requiredDate { get; set; }
//[DataMember]
//public int rowcount { get; set; }
[DataMember]
public RequestDataDetails[] DocumentLines;
}
[DataContract]
public class RequestDataDetails
{
[DataMember]
public string itemCode { get; set; }
[DataMember]
public decimal quantity { get; set; }
[DataMember]
public decimal price { get; set; }
[DataMember]
public string supplier { get; set; }
[DataMember]
public string taxcode { get; set; }
}

Looks like you're not initialising this property
[DataMember]
public RequestDataDetails[] DocumentLines;
I recommend you to use List instead of RequestDataDetails[], as anyway you'll have to use an internal list.
Initialise the List of RequestDataDetails to fill it from the query, before the for loop.
List<RequestDataDetails> requestDetails = new List<RequestDataDetails>
Then change the for loop to add to that list instead of setting an array, im using the assignment you were doing, not sure if it'll do what you expect, just tell me if it suits your needs.
requestDetails.add(new RequestDataDetails { itemCode = "" });
instead of
target.DocumentLines[0].itemCode = "";
Then after the for loop convert the list to an array and assign it to target
target.DocumentLines = requestDetails.ToArray();
Hope it works!

XML Parsing to c# objects

I am trying to do a XML parser which will extract data from a website using REST service, the protocol for communication is HTTP, the data I get is in XML format, and I get to the data I need after several requests to different addresses on the server. I need to parse this data to c# objects so I can operate with them lately.
The information on the server is on 5 levels( I am willing to make work only 4 of them for know)
1-List of vendors
2-List of groups
3-List of subgroups
4-List of products
5-List of full information about products
After I get to 4th level I need to check if the product is in my database or if it has different details so I can add or update it.
With "GET" request to a server I get XML with this structure:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<vendors>
<vendor>
<id>someID</id>
<name>someName</name>
</vendor>
<vendor>
<id>someId1</id>
<name>somename1</name>
</vendor>
</vendors>
XML structure for groups is the same :
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<groups vendor_id="43153185318">
<group>
<id>someID</id>
<name>someName</name>
</group>
<group>
<id>someId1</id>
<name>somename1</name>
</group>
The XML structure is analogical for subgroups and products, except that for products I have more elements like catalog_num, price etc.
I made the classes as follows :
public class VendorList
{
public List<Vendor> vendor_list { get; set; }
public VendorList()
{
vendor_list = new List<Vendor>();
}
}
public class Vendor
{
public string id { get; set; }
public string name { get; set; }
public List<Group> groups_list { get; set; }
public Vendor()
{
id = "N/A";
name = "N/A";
groups_list = new List<Group>();
}
}
public class Group
{
public string id { get; set; }
public string name { get; set; }
public List<SubGroup> subgroup_list { get; set; }
public Group()
{
id = "N/A";
name = "N/A";
subgroup_list = new List<SubGroup>();
}
}
public class SubGroup
{
public string id { get; set; }
public string name { get; set; }
public List<Product> product_list { get; set; }
public SubGroup()
{
id = "N/A";
name = "N/A";
product_list = new List<Product>();
}
}
public class Product
{
public string available { get; set; }
public string catalog_num { get; set; }
public string code { get; set; }
public string currency { get; set; }
public string description { get; set; }
public string haracteristics { get; set; }
public string product_id { get; set; }
public string model { get; set; }
public string name { get; set; }
public string price { get; set; }
public string price_dds { get; set; }
public string picture_url { get; set; }
public Product()
{
available = "N/A";
catalog_num = "N/A";
code = "N/A";
currency = "N/A";
description = "N/A";
haracteristics = "N/A";
product_id = "N/A";
model = "N/A";
name = "N/A";
price = "N/A";
price_dds = "N/A";
picture_url = "N/A";
}
}
and the Parser method like this :
public static void FillVendor(string url)
{
string result = GetXMLstream(url);
var vendors = new VendorList();
XmlDocument doc = new XmlDocument();
doc.Load(new StringReader(result));
doc.Save(#"D:/proba/proba.xml");
XDocument d = XDocument.Load(#"D:/proba/proba.xml");
vendors.vendor_list = (from c in d.Descendants("vendor")
select new Vendor()
{
id = c.Element("id").Value,
name = c.Element("name").Value
}).ToList<Vendor>();
foreach (Vendor v in vendors.vendor_list)
{
FillGroups(v.id);
}
}
public static void FillGroups(string vendorID)
{
string url = "main address" + vendorID;
string result = GetXMLstream(url);
var group = new Vendor();
XmlDocument doc = new XmlDocument();
doc.Load(new StringReader(result));
doc.Save(#"D:/proba/proba1.xml");
XDocument d = XDocument.Load(#"D:/proba/proba1.xml");
group.groups_list = (from g in d.Descendants("group")
select new Group()
{
id = g.Element("id").Value,
name = g.Element("name").Value
}).ToList<Group>();
foreach (Group g in group.groups_list)
{
FillSubGroup(vendorID, g.id);
}
}
public static void FillSubGroup(string vendorID, string groupID)
{
string url = "main address" + vendorID+"/"+groupID;
string result = GetXMLstream(url);
var subgroup = new Group();
XmlDocument doc = new XmlDocument();
doc.Load(new StringReader(result));
doc.Save(#"D:/proba/proba2.xml");
XDocument d = XDocument.Load(#"D:/proba/proba2.xml");
subgroup.subgroup_list = (from g in d.Descendants("subgroup")
select new SubGroup()
{
id = g.Element("id").Value,
name = g.Element("name").Value
}).ToList<SubGroup>();
foreach (SubGroup sb in subgroup.subgroup_list)
{
FillProduct(vendorID, groupID, sb.id);
}
}
public static void FillProduct(string vendorID,string groupID,string subgroupID)
{
string url = "main address" + vendorID + "/" + groupID+"/"+subgroupID;
string result = GetXMLstream(url);
var product = new SubGroup();
XmlDocument doc = new XmlDocument();
doc.Load(new StringReader(result));
doc.Save(#"D:/proba/proba2.xml");
XDocument d = XDocument.Load(#"D:/proba/proba2.xml");
product.product_list = (from g in d.Descendants("subgroup")
select new Product()
{
available = g.Element("available").Value,
catalog_num = g.Element("catalog_num").Value,
code = g.Element("code").Value,
currency = g.Element("currency").Value,
description = g.Element("description").Value,
haracteristics = g.Element("haracteristics").Value,
product_id = g.Element("id").Value,
model = g.Element("model").Value,
name = g.Element("name").Value,
price = g.Element("price").Value,
price_dds = g.Element("price_dds").Value,
picture_url = g.Element("small_picture").Value,
}).ToList<Product>();
}
But after finishing parsing I try to check if my Lists are populated with objects, but I get an error which says that they are null "NullReferenceException"
So my question is did I make classes properly and is my parsing method right ( you can suggest how to parse the xml without creating a file on my computer) and if I didn't where is my mistake and how should I make it work properly?
Thanks in advance!

modify this line add 's'( vendor -> vendors)
-> vendors.vendor_list = (from c in d.Descendants("vendor")
and the same case for group -> groups

Instead of making the classes yourself.
Create a properly formatted XML Schema either manually or with Visual Studio and then from that XSD File you've created generate your C# Classes.