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How to have multiple Firebase AddSnapshotListener(s) inside a single class?

I have a class in android which has a listener setup to get visitorlist updates.
var visitorDetailsCollection = FirebaseFirestore.Instance.Collection("visitorDetails");
var visitorDetailsquery = visitorDetailsCollection.WhereEqualTo("UserID", Firebase.Auth.FirebaseAuth.Instance.CurrentUser.Uid);
visitorlistner = visitorDetailsquery.AddSnapshotListener(this);
and when the firestore db is updated the following method runs and gets the updates
public void OnEvent(Java.Lang.Object obj, FirebaseFirestoreException error)
{
try
{
var docs = (QuerySnapshot)obj;
visitorDetails.Clear();
foreach (var doc in docs.Documents)
{
var visitordetails = new VisitorDetails
{
Name = doc.Get("VisitorName").ToString(),
ContactNumber = doc.Get("VisitorContact").ToString(),
VehicleNumber = doc.Get("VisitorVehicleNo").ToString(),
IsApproved = doc.Get("VisitorIsApproved").ToString(),
IsActive = doc.Get("VisitorIsActive").ToString(),
Purpose = doc.Get("PurposeOfVisit").ToString(),
Email = doc.Get("VisitorEmail").ToString(),
FromDate = toDatetime(doc.GetDate("FromDate") as Date),
ToDate = toDatetime(doc.GetDate("ToDate") as Date),
docID = doc.Id
};
visitorDetails.Add(visitordetails);
}
Now I want to add another listener to get residentdetails like this
residentlistner = residentDetailsquery.AddSnapshotListener(this);
How do I tell this listener to run a different function like
public void OnEvent2(Java.Lang.Object obj, FirebaseFirestoreException error)
{}
when the firestore db is updated?

Load Windows form after complete combobox data load in c#

I have a form for employees called frmEmployees where I need to load couple of combo box with data like country, category, nationality, such others.
Now when user click on to open frmEmployees, window is stuck for bit and then open. I assume that this is because of data loading and initializing the combo box.
Now! what I want is, just after click on button to open frmEmployees run a progress bar till data loading complete and then open form.
public frmEmployee()
{
InitializeComponent();
con = new Connection();
LoadComboboxDS();
}
I have tried also
private void FrmEmployee_Load(object sender, EventArgs e)
{
LoadComboboxDS();
}
private void LoadComboboxDS()
{
//company
var _companies = con.Companies.Where(x => x.IsDeleted == false).ToList();
_companies.Insert(0,new data.Models.CompanyModels.Company { Address = new data.Models.Address(), Code = null, Name = "--Select--", BaseCurrency = new data.Models.Currency() });
cbCompany.DataSource = _companies;
cbCompany.DisplayMember = "Name";
cbCompany.ValueMember = "ID";
//gender
cbGender.DataSource = Enum.GetValues(typeof(Gender));
//merital status
cbMeritalStatus.DataSource = Enum.GetValues(typeof(MaritalStatus));
//citizenship
var _citizenships = con.Countries.Select(x => x.Citizenship).Distinct().ToList();
_citizenships.Insert(0, "--Select--");
cbCitizenship.DataSource = _citizenships;
cbCitizenship.DisplayMember = "Citizenship";
//nationality
var _nations = con.Countries.Select(x => x.Name).Distinct().ToList();
_nations.Insert(0, "--Select--");
cbNationality.DataSource = _nations;
cbNationality.DisplayMember = "Name";
//domicile
var _domiciles = con.Countries.Select(x => x.Name).Distinct().ToList();
_domiciles.Insert(0, "--Select--");
cbDomicile.DataSource = _domiciles;
cbDomicile.DisplayMember = "Name";
//cast category
var _casts = con.CastCategories.Select(x => new {x.ShortText, x.Description}).Distinct().ToList();
_casts.Insert(0, new { ShortText = "", Description = "--Select--" });
cbCategory.DataSource = _casts;
cbCategory.DisplayMember = "Description";
cbCategory.ValueMember = "ShortText";
//religion
cbReligion.DataSource = Enum.GetValues(typeof(Religion));
}

You can use Async extension methods of Entity Framework 6 to make your code asynchronous.
Separate your data access and presentation layer, at first:
public static class MyRepository // consider not static, just an example
{
public static async Task<List<Company>> GetCompanies()
{
using (var connection = new Connection()) // consider factory
{
return await con.Companies.Where(x => x.IsDeleted == false).ToListAsync();
}
}
public async Task<List<Citizenship>> GetCitizenships()
{
using (var connection = new Connection()) // factory?
{
return await con.Countries.Select(x => x.Citizenship).Distinct().ToList();
}
}
}
Then, you can run all these tasks at once and wait for them to complete:
// Wherever you are going to open frmEmployee
public async Task openFrmEmployee_OnClick(object sender, EventArgs e)
{
var getCompaniesTask = MyRepository.GetCompanies();
var getCitizenshipsTask = MyRepository.GetCitizenships();
await Task.WhenAll(getCompaniesTask, getCitizenshipsTask); // UI thread is not blocked
var form = new FrmEmployee(getCompaniesTask.Result, getCitizenshipsTask.Result); // form is created with data
}
Now, you only need to make your form accept complete data in constructor instead of making your form load this data which breaks abstraction:
public class FrmEmployees
{
public FrmEmployees(List<Company> companies, List<Citizenship> citizenships)
{
companies.Insert(0,new data.Models.CompanyModels.Company { Address = new data.Models.Address(), Code = null, Name = "--Select--", BaseCurrency = new data.Models.Currency() });
cbCompany.DataSource = companies;
cbCompany.DisplayMember = "Name";
cbCompany.ValueMember = "ID";
citizenships.Insert(0, "--Select--");
cbCitizenship.DataSource = _citizenships;
cbCitizenship.DisplayMember = "Citizenship";
// etc.
}
}
One important thing: you can get many tasks and many data passed to a form constructor. If all this data is going to be used often togetther, then you would probably want to encapsulate this "get all these things" logic into a single place to remove possible code duplication.

See what I have done... if anyone can review my code it would be appreciable.
public class EmployeeFormDataRepesenter
{
public List<Company> Companies { get; set; }
public List<Country> Countries { get; set; }
public List<CastCategory> CastCategories { get; set; }
}
public void LoadData(EmployeeFormDataRepesenter representer)
{
//gender
cbGender.DataSource = Enum.GetValues(typeof(Gender));
//merital status
cbMeritalStatus.DataSource = Enum.GetValues(typeof(MaritalStatus));
//religion
cbReligion.DataSource = Enum.GetValues(typeof(Religion));
//company
var _companies = representer.Companies;
_companies.Insert(0, new data.Models.CompanyModels.Company { Address = new data.Models.Address(), Code = null, Name = "--Select--", BaseCurrency = new data.Models.Currency() });
cbCompany.DataSource = _companies;
cbCompany.DisplayMember = "Name";
cbCompany.ValueMember = "ID";
//citizenship
var _citizenships = representer.Countries.Select(x => x.Citizenship).ToList();
_citizenships.Insert(0, "--Select--");
cbCitizenship.DataSource = _citizenships;
cbCitizenship.DisplayMember = "Citizenship";
//nationality
var _nations = representer.Countries.Select(x => x.Name).ToList();
_nations.Insert(0, "--Select--");
cbNationality.DataSource = _nations;
cbNationality.DisplayMember = "Name";
//domicile
var _domiciles = representer.Countries.Select(x => x.Name).ToList();
_domiciles.Insert(0, "--Select--");
cbDomicile.DataSource = _domiciles;
cbDomicile.DisplayMember = "Name";
//cast category
var _casts = representer.CastCategories.Select(x => new { x.ShortText, x.Description }).Distinct().ToList();
_casts.Insert(0, new { ShortText = "", Description = "--Select--" });
cbCategory.DataSource = _casts;
cbCategory.DisplayMember = "Description";
cbCategory.ValueMember = "ShortText";
}
private async void btnEmplyee_Click(object sender, EventArgs e)
{
con = new Connection();
Action showProgress = () => frmStatrup._progressBar.Visible = true;
Action hideProgress = () => frmStatrup._progressBar.Visible = false;
EmployeeFormDataRepesenter representer;
Task<List<Company>> _taskCompany = new Task<List<Company>>(() =>
{
BeginInvoke(showProgress);
var list = con.Companies.ToListAsync();
BeginInvoke(hideProgress);
if (list != null)
return list.Result;
return null;
});
Task<List<Country>> _taskCountry = new Task<List<Country>>(() =>
{
BeginInvoke(showProgress);
var list = con.Countries.ToListAsync();
BeginInvoke(hideProgress);
if (list != null)
return list.Result;
return null;
});
Task<List<CastCategory>> _taskCasts = new Task<List<CastCategory>>(() =>
{
BeginInvoke(showProgress);
var list = con.CastCategories.ToListAsync();
BeginInvoke(hideProgress);
if (list != null)
return list.Result;
return null;
});
_taskCompany.Start();
var _companies = await _taskCompany;
_taskCountry.Start();
var _countries = await _taskCountry;
_taskCasts.Start();
var _casts = await _taskCasts;
if (_companies.Count != 0)
{
representer = new EmployeeFormDataRepesenter();
representer.Companies = _companies;
representer.Countries = _countries;
representer.CastCategories = _casts;
}
else
{
representer = null;
}
if (representer != null)
{
frmEmployee _emp = new frmEmployee();
_emp.LoadData(representer);
Functions.OpenForm(_emp, this.ParentForm);
}
}

Bing API Query Callback to Observable Collection

Created a Windows Store App using some info found on this post: How do I use the Bing Search API in Windows Phone?
Goal
Textbox - Type any term
Search Button - Searches that term and populates a GridView of pictures retrieved with the Bing API
Problem
I get the pictures, and they are received via my "OnQueryComplete" callback, but I can't figure out what the correct way to populate the collection would be. Since I can't figure out how to await this call, I (just to see if I could get it working, which it does) added a while loop (which you can probably see the issues with). What would be the correct way to do this? How do you handle callbacks for populating the GridView and having it wait until it's finished?
Current ViewModel Code
public bool itemsFinished = false;
private ObservableCollection<SearchResult> _ImageResults;
public ObservableCollection<SearchResult> ImageResults {
get {
if (_ImageResults == null) {
while (!itemsFinished) {
int i = 0;
i++;
}
}
return _ImageResults;
}
set {
_ImageResults = value;
}
}
public SearchResultViewModel() {
GetPictures("dogs");
}
public void GetPictures(string searchTerm) {
// This is the query - or you could get it from args.
string query = searchTerm;
// Create a Bing container.
string rootUri = "https://api.datamarket.azure.com/Bing/Search";
var bingContainer = new Bing.BingSearchContainer(new Uri(rootUri));
// Replace this value with your account key.
var accountKey = "myaccountkey";
// Configure bingContainer to use your credentials.
bingContainer.Credentials = new NetworkCredential(accountKey, accountKey);
// Build the query.
var imageQuery = bingContainer.Image(query, null, null, null, null, null, null);
imageQuery.BeginExecute(OnQueryComplete, imageQuery);
// var imageResults = imageQuery.Execute();
}
private void OnQueryComplete(IAsyncResult result) {
// ImageResults.Clear();
_ImageResults = new ObservableCollection<SearchResult>();
var query = (DataServiceQuery<ImageResult>)result.AsyncState;
var enumerableResults = query.EndExecute(result);
int i = 0;
foreach (var item in enumerableResults) {
SearchResult myResult = new SearchResult();
myResult.Title = item.Title;
myResult.ImageUri = new Uri(item.MediaUrl);
ImageResults.Add(myResult);
i++;
if (i >= 14) {
break;
}
}
itemsFinished = true;
}

Please excuse any syntax errors, I'm without a Visual Studio instance right now.
The problem I see is that you reset your ObservableCollection when you receive content.
Try it as follows:
private ObservableCollection<SearchResult> _ImageResults;
public ObservableCollection<SearchResult> ImageResults {
get
{
return _ImageResults;
}
set {
_ImageResults = value;
}
}
public SearchResultViewModel() {
_ImageResults = new ObservableCollection<SearchResult>(); // Just create it once.
GetPictures("dogs");
}
private void OnQueryComplete(IAsyncResult result) {
_ImageResults.Clear(); // Clear isn't bad, that way you keep your reference to your original collection!
//_ImageResults = new ObservableCollection<SearchResult>(); // We already have one. ObservableCollection works best if you keep on working with the collection you have.
var query = (DataServiceQuery<ImageResult>)result.AsyncState;
var enumerableResults = query.EndExecute(result);
int i = 0;
foreach (var item in enumerableResults) {
SearchResult myResult = new SearchResult();
myResult.Title = item.Title;
myResult.ImageUri = new Uri(item.MediaUrl);
ImageResults.Add(myResult);
i++;
if (i >= 14) {
break;
}
}
}
As far as I see (can't test sadly) this should work, provided you have bound your ObservableCollection the right way in your xaml.

How can I pass a function with one parameter to an ICommand?

Here's my ICommand:
public ICommand ConfirmLotSavedCommand {
get
{
return new RelayCommand(ConfirmLotSaved);
}
}
The problem is I have deserialized data that I want to store into database after a user clicks confirm button. If the user does not click on confirm or the lot number already exists, then I don't want to save the deserialized string in db.
I had trouble calling a function with one parameter inside my ConfirmLotSaved() method because of scope.
So I created a set the deserialized lot as a field and put the code to save to db inside of ConfirmLotSaved(). However, the field is null for some strange reason... I'm not sure why.
Here's my attempt:
private LotInformation lot; //field that is supposed to contain all the deserialized info
private void ConfirmLotSaved()
{
using (var db = new DDataContext())
{
bool lotNumDbExists = db.LotInformation.Any(r => r.lot_number == DeserialLotNumber);
if (lotNumDbExists == false)
{
successWindow.Message = "Successfully Saved Lot";
dialogService.ShowDialog(successWindow.Message, successWindow);
LotInformation newLot = new LotInformation();
if (newLot != null)
{
newLot.Id = lot.Id;
newLot.lot_number = lot.lot_number;
newLot.exp_date = lot.exp_date;
LotNumber = Lot.lot_number;
ExpirationDate = Lot.exp_date.ToString();
foreach (Components comp in lot.Components)
{
newLot.Components.Add(comp);
}
ComponentsList = newLot.Components;
foreach (Families fam in lot.Families)
{
newLot.Families.Add(fam);
}
FamiliesList = newLot.Families;
try
{
db.LotInformation.Add(newLot);
db.SaveChanges();
//Grabs the lot_number column from db that is distinct
var lotNum = db.LotInformation.GroupBy(i => i.lot_number).Select(group => group.FirstOrDefault());
//Loops through the lot numbers column in db and converts to list
foreach (var item in lotNum)
{
Console.WriteLine(item.lot_number);
}
LotNumList = lotNum.ToList();
Console.WriteLine("successfully");
}
catch
{
//TODO: Add a Dialog Here
}
}
else if (lotNumDbExists == true)
{
// Inform user that the lot_number already exists
errorWindow.Message = LanguageResources.Resource.Lot_Exists_Already;
dialogService.ShowDialog(LanguageResources.Resource.Error, errorWindow);
logger.writeErrLog(LanguageResources.Resource.Lot_Exists_Already);
return;
}
}
}
}
Deserialization function to see where lot is grabbing data:
public void DeserializedStream(string filePath)
{
XmlRootAttribute xRoot = new XmlRootAttribute();
xRoot.ElementName = "lot_information";
xRoot.IsNullable = false;
// Create an instance of lotinformation class.
LotInformation lot = new LotInformation();
// Create an instance of stream writer.
TextReader txtReader = new StreamReader(filePath);
// Create and instance of XmlSerializer class.
XmlSerializer xmlSerializer = new XmlSerializer(typeof(LotInformation), xRoot);
// DeSerialize from the StreamReader
lot = (LotInformation)xmlSerializer.Deserialize(txtReader);
// Close the stream reader
txtReader.Close();
LotInformation newList = new LotInformation();
using (var db = new DDataContext())
{
bool isDuplicate = db.LotInformation.Any(r => r.lot_number == lot.lot_number);
if (newList != null && isDuplicate == false)
{
newList.Id = lot.Id;
newList.lot_number = lot.lot_number;
newList.exp_date = lot.exp_date;
DeserialLotNumber = newList.lot_number;
DeserialExpirationDate = newList.exp_date.ToString();
foreach (Component comp in lot.Components)
{
newList.Components.Add(comp);
}
DeserialComponentsList = newList.Components;
foreach (Families fam in lot.Families)
{
newList.Families.Add(fam);
}
DeserialFamiliesList = newList.Families;
}
else if (isDuplicate == true)
{
DeserialAnalytesList = null;
DeserialFamiliesList = null;
// Inform user that the lot_number already exists
errorWindow.Message = LanguageResources.Resource.Lot_Exists_Already;
dialogService.ShowDialog(LanguageResources.Resource.Error, errorWindow);
logger.writeErrLog(LanguageResources.Resource.Lot_Exists_Already);
return;
}
}
}

I figured out what was wrong:
After setting private LotInformation lot; field before constructor, I redeclared locally my mistake:
LotInformation lot = new LotInformation();
Changed it to:
lot = new LotInformation();
and it works.

I suggest you to use RelayCommand's generic edition http://www.kellydun.com/wpf-relaycommand-with-parameter/
It will allow you to pass lot to your command from view, all you need to store lot in current DataContext.

How can I specify Product/Service for an Invoice Line Item for QBO IPP .NET SDK V3?

I'm trying to specify a Product/Service list item for invoice line items of invoices that I am importing to QuickBooks Online (QBO) company file and I am getting an error.
Error I receive is:
Intuit.Ipp.Exception.IdsException: InternalServerError ---> Intuit.Ipp.Exception.EndpointNotFoundException: Ids service endpoint was not found.
The exception doesn't give any further breakdown as to if what I'm doing is valid or not.
My unit test method:
[TestMethod()]
public void CreateTest()
{
Entities.Invoice invoice = new Entities.Invoice();
invoice.ReferenceId = Guid.NewGuid().ToString("N").Substring(0, 10);
invoice.CreatedDate = DateTime.Now;
invoice.CustomerId = 1;
invoice.LineItems.Add(new InvoiceLine() { ItemName = "Initial Funding", Description = "Initial Funding", Amount = 5500 });
invoice.LineItems.Add(new InvoiceLine() { ItemName = "Lien Fee", Description = "Lien Fee", Amount = 100 });
IPPRestProfile restProfile = new IPPRestProfile(realmId, accessToken, accessTokenSecret, Intuit.Ipp.Core.IntuitServicesType.QBO, consumerKey, consumerSecret);
IPP.Invoices target = new IPP.Invoices(restProfile);
Intuit.Ipp.Data.Invoice actual = target.Create(invoice);
if (actual != null)
{
Console.WriteLine("QB Invoice ID: {0}", actual.Id);
Console.WriteLine("QB Sync Token: {0}", actual.SyncToken);
Console.WriteLine("================================================");
ObjectDumper.Write(actual, 4);
}
}
The method that the unit test calls:
public Intuit.Ipp.Data.Invoice Create(Entities.Invoice invoice)
{
// Check pre-conditions
if (invoice == null) { throw new ArgumentException("Invoice object is required.", "invoice"); }
var qboInvoice = new Intuit.Ipp.Data.Invoice();
BuildInvoiceEntity(qboInvoice, invoice);
return _Service.Add(qboInvoice) as Intuit.Ipp.Data.Invoice;
}
And finally the build invoice method:
private void BuildInvoiceEntity(Intuit.Ipp.Data.Invoice qboInvoice, Entities.Invoice invoice)
{
if (qboInvoice != null && invoice != null)
{
IQuickBooksHeader header = invoice as IQuickBooksHeader;
if (String.IsNullOrEmpty(header.Id))
{
qboInvoice.DocNumber = invoice.ReferenceId;
qboInvoice.TxnDate = invoice.CreatedDate;
qboInvoice.TxnDateSpecified = true;
// Customer
qboInvoice.CustomerRef = new ReferenceType()
{
type = objectNameEnumType.Customer.ToString(),
Value = invoice.CustomerId.ToString()
};
// AR Account
qboInvoice.ARAccountRef = new ReferenceType()
{
type = objectNameEnumType.Account.ToString(),
name = "Accounts Receivable"
};
}
if (invoice.LineItems.Count > 0)
{
Intuit.Ipp.Data.Line[] invoiceLineCollection = new Intuit.Ipp.Data.Line[invoice.LineItems.Count];
for (int i = 0; i < invoice.LineItems.Count; i++)
{
var line = invoice.LineItems[i];
var qboInvoiceLine = new Intuit.Ipp.Data.Line()
{
Amount = line.Amount,
AmountSpecified = true,
Description = line.Description,
DetailType = LineDetailTypeEnum.SalesItemLineDetail,
DetailTypeSpecified = true,
AnyIntuitObject = new SalesItemLineDetail()
{
ItemRef = new ReferenceType()
{
name = line.ItemName,
},
ItemElementName = ItemChoiceType.UnitPrice,
AnyIntuitObject = line.Amount
}
};
invoiceLineCollection[i] = qboInvoiceLine;
}
qboInvoice.Line = invoiceLineCollection;
}
}
}
If I remove this piece of code from my build method:
ItemRef = new ReferenceType()
{
name = line.ItemName,
},
the invoice is successfully added with the default "Services" list item for the Product/Service of the invoice line items.
The online documentation for the IPP .NET SDK V3 is vague on what to specify for ReferenceType. What is wrong about just specifying the name of the list item? If I'm wrong about how I'm trying to specify a Product/Service list item for invoice line items, what is the correct way?

After days of researching, I never did find an answer as to why I can't just use the name like I wanted to, even though it works that way when specifying an AccountRef. But I digress, here is my solution:
// Hold a collection of QBO items
private ReadOnlyCollection<Item> _Items;
// I set the collection in the constructor only once
public Invoices(Entities.IPPRestProfile restProfile)
{
if (restProfile == null)
throw new ArgumentException("IPPRestProfile object is required.", "restProfile");
OAuthRequestValidator oAuthValidator = new OAuthRequestValidator(restProfile.OAuthAccessToken, restProfile.OAuthAccessTokenSecret,
restProfile.ConsumerKey, restProfile.ConsumerSecret);
ServiceContext context = new ServiceContext(restProfile.RealmId, restProfile.DataSource, oAuthValidator);
_Service = new DataService(context);
_Items = (new QueryService<Item>(context)).ExecuteIdsQuery("SELECT * FROM Item", QueryOperationType.query);
}
Whenever I build my invoice I query the collection for the Id of the item by name:
private void BuildInvoiceEntity(Intuit.Ipp.Data.Invoice qboInvoice, Entities.Invoice invoice)
{
...
// Get the Id value of the item by name
string itemTypeId = _Items.Where(o => o.Name == line.ItemName).FirstOrDefault().Id;
// Specify the Id value in the item reference of the SalesItemLineDetail
var qboInvoiceLine = new Intuit.Ipp.Data.Line()
{
Amount = (decimal)amount,
AmountSpecified = true,
Description = line.Description,
DetailType = LineDetailTypeEnum.SalesItemLineDetail,
DetailTypeSpecified = true,
AnyIntuitObject = new SalesItemLineDetail()
{
ItemRef = new ReferenceType() { Value = itemTypeId },
AnyIntuitObject = (decimal)line.Rate,
ItemElementName = ItemChoiceType.UnitPrice
}
};
...
}
Hopefully this helps point someone in the right direction to a possible better solution.