logo
down
shadow

Why can't I use HashSet<string> to implement an IEnumerable<string> interface property?


Why can't I use HashSet<string> to implement an IEnumerable<string> interface property?

By : shakti
Date : November 22 2020, 10:38 AM
around this issue To implement interface member signature must be exactly the same as declared in interface. You can't implement a property that's declared to return A with another one that returns B even when B inherits/implements A.
You can implement that member expliticly and route it to your property:
code :
public class Lookups : ILookups
{
    public HashSet<string> FirstNames { get; set; }

    IEnumerable<string> ILookups.FirstNames { get { return this.FirstNames; } }
}
var lookups = (ILookups)new Lookups();
// assigning List<string> to ILookups.FirstNames, which is IEnumerable<string>
lookups.FirstNames = new List<string>();


Share : facebook icon twitter icon
Implement IEnumerable, but avoid 'MyClass' does not implement interface member 'IEnumerable.GetEnumerator()'

Implement IEnumerable, but avoid 'MyClass' does not implement interface member 'IEnumerable.GetEnumerator()'


By : bbkim83
Date : March 29 2020, 07:55 AM
it fixes the issue If you want to avoid manually implementing IEnumerable, the language supports some syntactic sugar that auto-generates most of it for you. It's not implementing IEnumerable<> on your class (if you want it, you've got to implement it, as other people have said), but it's close.
code :
public class MyClass
{
    private bool TryGetNextFloat(out float nextFloat) {/* Whatever */};
    public IEnumerable<float> AsEnumerable()
    { 
        float nextFloat = 0;
        while(this.TryGetNextFloat(out nextFloat))
        {
            yield nextFloat;
        }
    }
}

// Elsewhere
foreach (var f in myClassInstance.AsEnumerable())
{
    // Do something with f
}
How to implement IEnumerable<Animal> as IEnumerable<Monkey> in an interface implementation (covariance)

How to implement IEnumerable<Animal> as IEnumerable<Monkey> in an interface implementation (covariance)


By : Kyle Malone
Date : March 29 2020, 07:55 AM
it helps some times This is not possible, because interface implementations in C# have to match the exact signature defined in the interface.
Some information on why this is the case can be found in this post by Eric Lippert: https://stackoverflow.com/a/7996843/4961688
convert\map an existing property to `IEnumerable<KeyValuePair<String, String>>`

convert\map an existing property to `IEnumerable<KeyValuePair<String, String>>`


By : Gulshan Barkud
Date : March 29 2020, 07:55 AM
help you fix your problem There is no way to do so without reflection. Here is the ToDictionary method that we use for that:
code :
/// <summary>
///     Gets all public properties of an object and and puts them into dictionary.
/// </summary>
public static IDictionary<string, object> ToDictionary(this object instance)
{
    if (instance == null)
        throw new NullReferenceException();

    // if an object is dynamic it will convert to IDictionary<string, object>
    var result = instance as IDictionary<string, object>;
    if (result != null)
        return result;

    return instance.GetType()
        .GetProperties()
        .ToDictionary(x => x.Name, x => x.GetValue(instance));
}
Filter IEnumerable<object> based on whether string property contains any string value of another List<string>

Filter IEnumerable<object> based on whether string property contains any string value of another List<string>


By : Prageeth Acharya
Date : March 29 2020, 07:55 AM
I wish this help you Make a HashSet of excluded factions, then use this set to filter your cards:
code :
var excludedFactionSet = new HashSet<string>(excludedFactions);
cardsVM.Cards = repository.Cards
    .Where(c => !excludedFactionSet.Contains(c.Factions))
    .ToList();
LINQ: Get all objects with a matching string property from an incoming IEnumerable<string> in a performant way

LINQ: Get all objects with a matching string property from an incoming IEnumerable<string> in a performant way


By : Soxxxy
Date : March 29 2020, 07:55 AM
To fix the issue you can do I just saw this piece of code and asked myself how it can be improved to reduce the amount of queries. Tried a few LINQ statements but could not find an answer. , The problem is in your query. Try this code:
code :
var computers = db.Computers.Where(x => workStations.Any(y => y.Equals(x.Id)).ToList();

foreach (var computer in computers)
{
    if (!dict.ContainsKey(computer.Id))
    {
        dict.Add(computer.Id, computer);
    }
}
Related Posts Related Posts :
  • Accessing Settings in different ways
  • "This project is empty" error in Sonarqube
  • How to create reusable icon menu in Xamarin
  • Value Cannot be null in Ado.Net connectivity
  • Adding a custom/dynamic attribute when using XSD.exe
  • How to convert object to correct type
  • Automatically sign out from Forms Authentication in ASP.NET when browser is closed
  • Can a WCF service support both Buffered and Streamed transfer modes?
  • Verify a CA Certificate with a public key in C#
  • How to invoke a Web Service that requires the "patch" verb using the C# WebClient wrapper?
  • Proper way a implementing property based on generic type
  • Closing a form that is created in another thread
  • How Can You Bind a List<String> to a StackPanel
  • WPF Application Update Best Practices - Architectural Explanation
  • System.UnauthorizedAccessException in Server.MapPath()
  • Connecting and Using SQL Compact Edition in a WPF application
  • C#: weird ref in constructor to behave like "virtual field"
  • C# XDocument Load with multiple roots
  • How to decide what goes in the Domain or Application Project in a "DDD" solution?
  • How to get/set a property of an interface that is not always implemented
  • Read-only array field in unsafe struct
  • i got "Invalid attempt to call Read when reader is closed" when using sqldatareader how to solve it in a three
  • Why should I encapsulate objects in using if there is garbage collection
  • How to load Word document from byte array
  • Caliburn.Micro and ContextMenu for DataGrid Row
  • Linq "join" with a IList<T> getting "Error Unable to create a constant value.."
  • How to draw red wavy line under words in RichTextBox c# winform
  • HttpPostedFileBase returns Null MVC3
  • Refresh Dropdownlist in webform
  • How to convert serialized byte array back to its text form
  • How to do a loop to check all the variables at the same time for C#?
  • Facebook Sentiment Analysis API
  • Counting occurrences of specific letters in string
  • Module 'System.Data.Linq' Version=4.0.0.0, Culture=neutral, Publickeytoken=b77a5c561934e089' should be referenced
  • C# MVC Dynamically create view model
  • Get Executing Path of C# application when using nunit with Jenkins
  • GDI count stable near 100 but Handle count keep increasing
  • Problem adding string value to ViewBag from an MVC Action using TempData
  • Reading Excel file on condition
  • what is windows programming from C++, C# and Java perspective?
  • How to deal with C# object references in MongoDB?
  • How to create a list from filtering 2 lists with linq to object
  • Webclient calls to DownloadString cause my app to freeze
  • How to create a JSON WebService in c# ASP.Net with a valid JSON output and query with JQuery/Ajax
  • Submit button not working as expected
  • MvcSitemapProvider parameters sometimes works sometimes not
  • Console application doesn't obey Thread.Join
  • System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
  • Creating a scripting environment for a C# program
  • Is it reasonable to replace .Equals with a method rather than override it?
  • How I can capture multiple keys?
  • How to have all my classes default functionalities like .ToString method
  • Business Object properties: model as Objects or Enums?
  • Loading this assembly would produce a different grant set from other instances
  • How to call a method without first calling it's constructor in C#
  • Can't set a date time in one of my entity framework objects, says NullReferenceException
  • GETJob() Win32 Print spooler api 64bit The parameter is incorrect, how to fix?
  • Switch Case Causing Trouble In Going To A particular Function
  • Switch Case Calling A Function Based On The User's Choice
  • Accessing WebBrowser on different Threads
  • shadow
    Privacy Policy - Terms - Contact Us © ourworld-yourmove.org