Develop Reference

System.ArgumentNullException: Value cannot be null Parameter name: value - How to fix this error?

Please help! I am getting error in the line :
details.NominalVoltage = String.Join(",", paneldetails?.NominalVoltage?.ToArray());
I have below code in my builder.
foreach (var panel in panelAddresses.Take(2))
{
var paneldetails = new SM_NFPA72ReportPage1();
details.batteryDetails = new List<Battery>();
var AssociatedPrimaryPowers = new Repository(new BuildConnection()).GetPanelPrimarypowerDevcies(reportInput.UseroId, panel, reportInput.BuildingId, reportInput.TestSessionId[0]).Result;
AssociatedPrimaryPowers.ForEach(x => paneldetails?.batteryDetails?.Add(new Battery
{
NominalVoltage = deviceDetailsList?.CustomProperty?.Where(y => y.fieldName == "nominalVoltage")?.FirstOrDefault()?.Value,
NominalAmps = deviceDetailsList?.CustomProperty?.Where(y => y.fieldName == "nominalAmps")?.FirstOrDefault()?.Value,
NominalLocation = deviceDetailsList?.CustomProperty?.Where(y => y.fieldName == "disconnectLocation")?.FirstOrDefault()?.Value,
Protection = deviceDetailsList?.CustomProperty?.Where(y => y.fieldName == "overCurrentType")?.FirstOrDefault()?.Value,
ProtectionAmps = deviceDetailsList?.CustomProperty?.Where(y => y.fieldName == "overCurrentAmps")?.FirstOrDefault()?.Value,
ProtectionLocation = deviceDetailsList?.CustomProperty?.Where(y => y.fieldName == "powerLocation")?.FirstOrDefault()?.Value,
}));
details.NominalVoltage = String.Join(",", paneldetails?.NominalVoltage?.ToArray());
details.NominalAmps = String.Join(",", paneldetails?.NominalAmps?.ToArray());
details.NominalLocation = String.Join(",", paneldetails?.NominalLocation?.ToArray());
details.Protection = String.Join(",", paneldetails?.Protection?.ToArray());
details.ProtectionAmps = String.Join(",", paneldetails?.ProtectionAmps?.ToArray());
details.ProtectionLocation = String.Join(",", paneldetails?.ProtectionLocation?.ToArray());
}
Below attached is my model for above builder:
public class SM_NFPA72ReportPage1 : IReportModel
{
public string NominalVoltage { get; set; }
public string NominalAmps { get; set; }
public string NominalLocation { get; set; }
public string Protection { get; set; }
public string ProtectionAmps { get; set; }
public string ProtectionLocation { get; set; }
public List<Battery> batteryDetails { get; set; }
public List<PanelDetailsInfo> panelInfo { get; set; }
}
I am reusing the Battery model to fetch the values from repository
public class Battery
{
public string NominalVoltage { get; set; }
public string NominalAmps { get; set; }
public string NominalLocation { get; set; }
public string Protection { get; set; }
public string ProtectionAmps { get; set; }
public string ProtectionLocation { get; set; }
}

The exception tells you that the parameter value is null, that should mean that:
paneldetails?.NominalVoltage?.ToArray()
...gives you a null result, and that the string.Join method does not accept it.
You need to make sure that you do not provide a null value to the method.
This can be achieved in multiple ways, for example by checking for null value before calling the method:
if (panelDetails?.NominalVoltage != null)
{
details.NominalVoltage = String.Join(",", paneldetails.NominalVoltage.ToArray());
}
or by returning a empty array by default if it is null:
details.NominalVoltage = String.Join(",", paneldetails?.NominalVoltage?.ToArray() ?? Array.Empty<string>());

Unable to fetch data from Azure Cosmos DB

I am having the below model class CallbackResponse.cs :
public class CallbackResponse
{
public Callback Data { get; set; }
}
public class Callback
{
public IEnumerable<ReviewInProgressActivityFeed> ActivitiesFeed { get; set; }
}
public class ReviewInProgressActivityFeed
{
public ReviewInProgressStatus ReviewerSession { get; set; }
}
public class ReviewInProgressStatus
{
public Guid ReviewActivityId { get; set; }
public string ReviewerName { get; set; }
public string ReviewComments { get; set; }
public DateTime ActivityDateTime { get; set; }
}
Sample Payload:
{
"data":
{
"activitiesFeed": [
{
"reviewerSession":
{
"reviewActivityId": "dd9937c3-7c01-4a4a-bc8d-05ef37b07ee5",
"ReviewerName": "Verification Team",
"reviewComments": "upload business verification document for further verification.",
"activityDateTime": "2021-03-31T18:34:26.5978962Z"
},
},
{
"reviewerSession":
{
"reviewActivityId": "dd9937c3-7c01-4a4a-bc8d-05ef37b07ee5",
"ReviewerName": "Other Team",
"reviewComments": "other documents required for verification.",
"activityDateTime": "2021-03-31T19:34:26.5978962Z"
},
}
]
}
}
I am trying to get the data from DB via the CallbackResponse model class. Please find the code for below.
public async Task<CallbackResponse> CallbackActivityFeedAsync(Guid Id)
{
CallbackResponse containerItems = new CallbackResponse();
IQueryable<HumanReviewRequest> query = cosmosReviewRequestContainer.GetItemLinqQueryable<HumanReviewRequest>(true);
query = query.Where(x => x.id == Id);
FeedIterator<HumanReviewRequest> feedIterator = query.ToFeedIterator();
while (feedIterator.HasMoreResults)
{
FeedResponse<HumanReviewRequest> r = await feedIterator.ReadNextAsync().ConfigureAwait(false);
foreach (HumanReviewRequest requestModel in r)
{
containerItems = new CallbackResponse
{
Data = new Callback
{
ActivitiesFeed = new List<ReviewInProgressActivityFeed>
{
new ReviewInProgressActivityFeed
{
ReviewerSession = new ReviewInProgressStatus
{
ReviewActivityId = requestModel.ReviewActivities.Select(x => x.ReviewerSession.ReviewActivityId).LastOrDefault(),
ActivityDateTime = requestModel.ReviewActivities.Select(x => x.ReviewerSession.ActivityDateTime).LastOrDefault(),
ReviewComments = requestModel.ReviewActivities.Select(x => x.ReviewerSession.ReviewerComments).LastOrDefault(),
ReviewerName = requestModel.ReviewActivities.Select(x => x.ReviewerSession.ReviewerName).LastOrDefault()
}
}
}
}
};
}
}
return containerItems;
}
The Problem here is I could not able to fetch all the records present in activitiesFeed array in DB. Instead I could only able to fetch the last record in that array(I am using Azure Cosmos DB). Please help me in this.
HumanReviewRequest.cs (which is DB Class)for reference:
public class HumanReviewRequest
{
public Guid Id { get; set; }
public IEnumerable<ReviewActivity> ReviewActivities { get; set; }
public class ReviewActivity
{
public ReviewerSession ReviewerSession { get; set; }
public string UserComments { get; set; }
}
public class ReviewerSession
{
public Guid ReviewActivityId { get; set; }
public Guid ReviewerUserId { get; set; }
public DateTime ActivityDateTime { get; set; }
public string ReviewerComments { get; set; }
}

This is because you are creating a new List<ReviewInProgressActivityFeed>, a new ReviewInProgressActivityFeed and reading only the last element in activitiesFeed for each iteration:
ReviewerSession = new ReviewInProgressStatus
{
ReviewActivityId = requestModel.ReviewActivities.Select(x => x.ReviewerSession.ReviewActivityId).LastOrDefault(),
ActivityDateTime = requestModel.ReviewActivities.Select(x => x.ReviewerSession.ActivityDateTime).LastOrDefault(),
ReviewComments = requestModel.ReviewActivities.Select(x => x.ReviewerSession.ReviewerComments).LastOrDefault(),
ReviewerName = requestModel.ReviewActivities.Select(x => x.ReviewerSession.ReviewerName).LastOrDefault()
}
Try below code instead of the above code:
public async Task<CallbackResponse> CallbackActivityFeedAsync(Guid Id)
{
CallbackResponse containerItems = new CallbackResponse();
containerItems.Data = new Callback();
containerItems.Data.ActivitiesFeed = new List<ReviewInProgressActivityFeed>();
IQueryable<HumanReviewRequest> query = cosmosReviewRequestContainer.GetItemLinqQueryable<HumanReviewRequest>(true);
query = query.Where(x => x.id == Id);
FeedIterator<HumanReviewRequest> feedIterator = query.ToFeedIterator();
while (feedIterator.HasMoreResults)
{
FeedResponse<HumanReviewRequest> r = await feedIterator.ReadNextAsync().ConfigureAwait(false);
if (r != null || r.ReviewActivities != null)
{
foreach (HumanReviewRequest requestModel in r.ReviewActivities)
{
containerItems.Data.ActivitiesFeed.Add(
new ReviewInProgressActivityFeed
{
ReviewerSession = new ReviewInProgressStatus
{
ReviewActivityId = requestModel.ReviewerSession.ReviewActivityId,
ActivityDateTime = requestModel.ReviewerSession.ActivityDateTime,
ReviewComments = requestModel.ReviewerSession.ReviewerComments,
ReviewerName = requestModel.ReviewerSession.ReviewerName
}
});
}
}
}
};
}
}
return containerItems;
}

Firebase database timestamp is not serializing, getting error {"Unexpected character encountered while parsing value: {. Path 'date',

i want to retrieve timestamp data of firestore collection, but im getting error - {"Unexpected character encountered while parsing value: {. Path 'date',
date field data screenshot
data screenshot
sample data set
{"Tyres":"12","sr_no":"","TruckNumber":"TS 12345","image_url":"https://firebasestorage.googleapis.com/v0/b/truck-41c31.appsp.jpg?alt=media&token=2dc86208-7f71-4e3c-876c-70a80d4822bf","date":{}}
code
Query truckQuery = fireStoreDb.Collection("users/QRRsqyWUas/orders");
QuerySnapshot truckQuerySnapshot = await truckQuery.GetSnapshotAsync();
List<Truck> lstTruck = new List<Truck>();
foreach (DocumentSnapshot documentSnapshot in truckQuerySnapshot.Documents)
{
if (documentSnapshot.Exists)
{
Dictionary<string, object> city = documentSnapshot.ToDictionary();
string json = JsonConvert.SerializeObject(city);
Truck newtruck = JsonConvert.DeserializeObject<Truck>(json);
newtruck.TruckNumber = documentSnapshot.Id;
newtruck.date = documentSnapshot.CreateTime.Value.ToDateTime();
lstTruck.Add(newtruck);
}
}
model
public class Truck
{
[FirestoreProperty]
[Required]
public string TruckNumber { get; set; }
[FirestoreProperty]
[Required]
public string Tyres { get; set; }
public DateTime date { get; set; }
[FirestoreProperty]
[Required]
public string image_url { get; set; }
[FirestoreProperty]
[Required]
public string sr_no { get; set; }
}
firestore date field data - 29 June 2020 at 22:23:44 UTC+5:30

foreach (DocumentSnapshot documentSnapshot in truckQuerySnapshot.Documents)
{
if (documentSnapshot.Exists)
{
Dictionary<string, object> city = documentSnapshot.ToDictionary();
city["date"] = DateTime.Now.ToString();//modified here for resolve
string json = JsonConvert.SerializeObject(city);
Truck newtruck = JsonConvert.DeserializeObject<Truck>(json);
newtruck.Docid = documentSnapshot.Id;
newtruck.date = documentSnapshot.CreateTime.Value.ToDateTime();
lstTruck.Add(newtruck);
}
}
i have assigned datetime now before the serializeObject(city), and my error gone.

I face the same Error in .netcore 5 with firebase Database
Solution :
Change in property : DateTime To DateTimeOffset
ex... "**public DateTimeOffset date { get; set; }**"
And in databse insert Date always in utc
ex... **object.date = DateTime.UtcNow;**
I Hope this helps everyone....

I face this problem and I solve it
I don't know if this consider a solution but I will share it here
Also, I use this method to convert returned Dictionary to Observablecollection Model
using Google.Cloud.Firestore;
FirestoreDb fdb;
private ObservableCollection<Items_Model> _result = new ObservableCollection<Items_Model>();
public ObservableCollection<Items_Model> result
{
get { return _result; }
}
public Page_Items()
{
InitializeComponent();
MyListView.ItemsSource = result;
GetAllItems();
}
Items_Model
using System;
using System.ComponentModel;
using System.Text.Json.Serialization;
namespace WPFApp1.Models
{
public class Items_Model : INotifyPropertyChanged
{
private string _Name { get; set; }
public Guid id { get; set; }
public string Name
{
get { return _Name; }
set { _Name = value; NotifyPropertyChanged("Name"); }
}
public string iid { get; set; }
public string Barcode { get; set; }
public string ImageUrl { get; set; }
public string Section { get; set; }
public string Notes { get; set; }
[JsonIgnore]
public DateTime AddDate { get; set; }
[JsonIgnore]
public DateTime UpdateDate { get; set; }
public string AddBy { get; set; }
public string UpdateBy { get; set; }
[JsonIgnore]
public string Key { get; set; }
public event PropertyChangedEventHandler PropertyChanged;
private void NotifyPropertyChanged(string propertyName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
}
}
Here is my solution
public async void GetAllItems()
{
try
{
CollectionReference customersRef = fdb.Collection("Items");
FirestoreChangeListener listener = customersRef.Listen(snapshot =>
{
foreach (var change in snapshot.Changes)
{
var dic = change.Document.ToDictionary();
//Here I Convert to DateTime
string AddD = dic["AddDate"].ToString();
string stringAddDate = AddD.Split(new string[] { "Timestamp: " }, StringSplitOptions.None).Last();
DateTime AddDate = Convert.ToDateTime(stringAddDate);
string UpD = dic["UpdateDate"].ToString();
string stringUpdateDate = UpD.Split(new string[] { "Timestamp: " }, StringSplitOptions.None).Last();
DateTime UpdateDate = Convert.ToDateTime(stringUpdateDate);
var obj = new Items_Model();
obj.id = Guid.Parse(dic["id"].ToString());
obj.iid = (dic["iid"] == null ? "" : dic["iid"].ToString());
obj.Name = (dic["Name"] == null ? "" : dic["Name"].ToString()) ;
obj.Barcode = (dic["Barcode"] == null ? "" : dic["Barcode"].ToString()) ;
obj.ImageUrl = (dic["ImageUrl"] == null ? "" : dic["ImageUrl"].ToString());
obj.Section = (dic["Section"] == null ? "" : dic["Section"].ToString());
obj.Notes = (dic["Notes"] == null ? "" : dic["Notes"].ToString());
obj.AddDate = AddDate;
obj.UpdateDate = UpdateDate;
obj.AddBy = (dic["AddBy"] == null ? "" : dic["AddBy"].ToString());
obj.UpdateBy = (dic["UpdateBy"] == null ? "" : dic["UpdateBy"].ToString());
if (change.ChangeType.ToString() == "Added")
{
App.Current.Dispatcher.Invoke((Action)delegate
{
result.Add(obj);
});
}
else if (change.ChangeType.ToString() == "Modified")
{
if (result.Where(c => c.id == obj.id).Any())
{
var item = result.Where(c => c.id == obj.id).FirstOrDefault();
//item = obj;
App.Current.Dispatcher.Invoke((Action)delegate
{
result.Insert(result.IndexOf(item), obj);
result.Remove(item);
});
}
}
else if (change.ChangeType.ToString() == "Removed")
{
if (result.Where(c => c.id == obj.id).Any())
{
var item = result.Where(c => c.id == obj.id).FirstOrDefault();
App.Current.Dispatcher.Invoke((Action)delegate
{
result.Remove(item);
});
}
}
}
});
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error");
}
}

How to select object and its properties base on its properties which is list with linq?

I have an object which has a property which is list. Based on that list I want to filter property of it along with other properties of an object.
I have following object
{
Adult: 1,
Child: 0,
Infant: 0,
Origin: 'ABC',
Destination: 'XYZ',
DomesticFlightInfos: [{
FlightID: flightId1,
FareID: fareId1,
IsInbound: true
},
{
FlightID: flightId2,
FareID: fareId2,
IsInbound: false
}
]
};
I want following two objects
{
Adult: 1,
Child: 0,
Infant: 0,
Origin: 'ABC',
Destination: 'XYZ',
DomesticFlightInfos: [{
FlightID: flightId1,
FareID: fareId1,
IsInbound: true
}]
};
Adult: 1,
Child: 0,
Infant: 0,
Origin: 'ABC',
Destination: 'XYZ',
DomesticFlightInfos: [{
FlightID: flightId2,
FareID: fareId2,
IsInbound: false
}]
I was trying to do reservation.DomesticFlightInfos.Where(x => !x.IsInbound); which was wrong and got casting issue. What could be the best solution for it?
C# Object
using System;
using System.Collections.Generic;
public class Program
{
public static void Main()
{
new DomesticFlightReservation()
{
Adult = 1,
Child = 0,
Infant = 0,
Origin = "ABC",
Destination = "XYZ",
DomesticFlightInfos = new List<DomesticFlightInfo>(){
new DomesticFlightInfo{
FlightID= "flightId1",
FareID= "fareId1",
IsInbound= true
},
new DomesticFlightInfo {
FlightID= "flightId2",
FareID= "fareId2",
IsInbound= false
}
}
};
}
}
public class DomesticFlightReservation
{
public int Adult { get; set; } = 0;
public int Child { get; set; } = 0;
public int Infant { get; set; } = 0;
public string Origin { get; set; }
public string Destination { get; set; }
public List<DomesticFlightInfo> DomesticFlightInfos { get; set; }
}
public class DomesticFlightInfo
{
public string FlightID { get; set; }
public string FareID { get; set; }
// True for inbound, false for outbound
public bool IsInbound { get; set; }
}

Since you haven't provided C# object, assuming your C# objects to be defined as
public class DomesticFlightInfo
{
public string FlightID { get; set; }
public string FareID { get; set; }
public bool IsInbound { get; set; }
}
public class RootObject
{
public int Adult { get; set; }
public int Child { get; set; }
public int Infant { get; set; }
public string Origin { get; set; }
public string Destination { get; set; }
public List<DomesticFlightInfo> DomesticFlightInfos { get; set; }
}
If your intention is to separate the Inbounds and Outbound flights to separate groups, you could
var reservation = JsonConvert.DeserializeObject<RootObject>(str);
var flattenedReservation = new[]{reservation}.SelectMany(x=>x.DomesticFlightInfos
.GroupBy(v=>v.IsInbound)
.Select(c =>
{
x.DomesticFlightInfos = c.ToList();
return x;
}));
var jsonCollection = flattenedReservation.Select(x=> JsonConvert.SerializeObject(x,settings));
If your intention is to separate out each flight info into separate jsons, you could
var flattenedReservation = new[]{reservation}.SelectMany(x=>x.DomesticFlightInfos
.Select(c =>
{
x.DomesticFlightInfos = new List<DomesticFlightInfo>{c};
return x;
}));
var jsonCollection = flattenedReservation.Select(x=> JsonConvert.SerializeObject(x));
Output

If you have a list as a collection, you can use SelectMany
So, if you have a list
List<RootObject> rootObjects
then you can do this like flatten the list to get individual items:
rootObjects.SelectMany(x=> x.DomesticFlightInfos).Where(y => !y.IsInbound);

Automapper 8 Ignore Attribute doesn't work on child descendant

I use AutoMapper 8.1.0 in a asp.net core project. I have an Automapper mapping that doesn't work as I expected. I reproduced the configuration so you can test it by yourself. So I have an ExpenseReport with a collection of ExpenseReportItem and this one with another collection. I have to keep the data of eTaxCollection after the mapping, but they are lost in the process.
So the question is why values of eTaxCollections are lost after calling _mapper.Map(vmodel, model) and how can I keep them?
The ignore attribute don't work. I also tried UseDestinationValue(). I lost 2 days trying to figure it out and I'm exhausted.
public void WeatherForecasts()
{
int[] excludeTaxes = new int[] { 2 };
var vmodel = new ExpenseReportCreateEditModel();
vmodel.Expenses.Add(new ExpenseReportItemModel()
{
ExcludeTaxIds = excludeTaxes,
Total = 12,
Id = 1
});
// fetch from bd
var model = new ExpenseReport();
// values will be lost after _mapper.Map...
var eTaxCollections = new HashSet<ExcludeExpenseReportItemTax>();
eTaxCollections.Add(new ExcludeExpenseReportItemTax()
{
TaxId = 1,
ExpenseReportItemId = 1
});
model.Items.Add(new ExpenseReportItem()
{
ExcludeTaxes = eTaxCollections,
ExpenseReportId = 1,
Id = 9
});
_mapper.Map(vmodel, model);
}
public class ExpenseReportCreateEditModelProfile : Profile
{
public ExpenseReportCreateEditModelProfile()
{
CreateMap<ExpenseReportCreateEditModel, ExpenseReport>()
.ForMember(d => d.Items, s => s.MapFrom(m => m.Expenses));
}
}
public class ExpenseReportItemModelProfile : Profile
{
public ExpenseReportItemModelProfile()
{
CreateMap<ExpenseReportItemModel, ExpenseReportItem>()
.ForMember(d => d.ExcludeTaxes, s => s.Ignore()); // <<<==== data are lost
}
}
public class ExpenseReportCreateEditModel
{
public int Id { get; set; }
public ICollection<ExpenseReportItemModel> Expenses { get; set; }
public ExpenseReportCreateEditModel()
{
Expenses = new HashSet<ExpenseReportItemModel>();
}
}
public class ExpenseReportItemModel
{
public int Id { get; set; }
public ICollection<int> ExcludeTaxIds { get; set; }
public decimal Total { get; set; }
public ExpenseReportItemModel()
{
ExcludeTaxIds = new HashSet<int>();
}
}
public class ExpenseReport
{
public int Id { get; set; }
public virtual ICollection<ExpenseReportItem> Items { get; set; }
public ExpenseReport()
{
Items = new HashSet<ExpenseReportItem>();
}
}
public class ExpenseReportItem
{
public int Id { get; set; }
public int ExpenseReportId { get; set; }
public virtual ICollection<ExcludeExpenseReportItemTax> ExcludeTaxes { get; set; }
public ExpenseReportItem()
{
ExcludeTaxes = new HashSet<ExcludeExpenseReportItemTax>();
}
}
public class ExcludeExpenseReportItemTax
{
public int ExpenseReportItemId { get; set; }
public virtual ExpenseReportItem ExpenseReportItem { get; set; }
public int TaxId { get; set; }
}
Thank you for any help
Edit
I execute the execution plan and perhaps this is the problem:
$typeMapDestination = ($dest ?? .New WebApplication1.Controllers.SampleDataController+ExpenseReportItem());
This is only way I can lost the values.
I have to find a solution now
Here the complete execution plan :
.If ($src == null) {
.Default(WebApplication1.Controllers.SampleDataController+ExpenseReportItem)
} .Else {
.Block() {
$typeMapDestination = ($dest ?? .New WebApplication1.Controllers.SampleDataController+ExpenseReportItem());
.Try {
.Block(System.Int32 $resolvedValue) {
.Block() {
$resolvedValue = .If (
$src == null || False
) {
.Default(System.Int32)
} .Else {
$src.Id
};
$typeMapDestination.Id = $resolvedValue
}
}
} .Catch (System.Exception $ex) {
.Block() {
.Throw .New AutoMapper.AutoMapperMappingException(
"Error mapping types.",
$ex,
.Constant<AutoMapper.TypePair>(AutoMapper.TypePair),
.Constant<AutoMapper.TypeMap>(AutoMapper.TypeMap),
.Constant<AutoMapper.PropertyMap>(AutoMapper.PropertyMap));
.Default(System.Int32)
}
};
$typeMapDestination
}
}