C#•2y ago

❔ What is the difference between public static and public static virtual in a interface?

This is a interface for dynamic plugins loaded from a AssemblyLoadContext.

using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;

namespace JJIntegration.PluginContracts;

public interface IScheduleTask
{
    /// more code above...

    /// <summary>
    /// Name of the task that will appear to the user
    /// </summary>
    string TaskName { get; }



    /// <summary>
    /// Add the dependencies from this ScheduleTask to the IServiceCollection of the application
    /// </summary>


    // My friends, what is the difference here if I add a virtual keyword? This method is meant to be optionally overriden.
    public static IServiceCollection AddServices(IServiceCollection services, IConfiguration configuration)
    {
        return services;
    }

    /// more code below...
}

using System;
using System.Collections.Generic;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;

namespace JJIntegration.PluginContracts;

public interface IScheduleTask
{
    /// more code above...

    /// <summary>
    /// Name of the task that will appear to the user
    /// </summary>
    string TaskName { get; }



    /// <summary>
    /// Add the dependencies from this ScheduleTask to the IServiceCollection of the application
    /// </summary>


    // My friends, what is the difference here if I add a virtual keyword? This method is meant to be optionally overriden.
    public static IServiceCollection AddServices(IServiceCollection services, IConfiguration configuration)
    {
        return services;
    }

    /// more code below...
}

What is the difference between public static virtual and public static in a interface? When I use public static virtual, the method cannot be loaded by reflection.

3 Replies

gumbarrosOP•2y ago

The main application also references Microsoft.Extensions.DependencyInjection.Abstractions, is this a problem?

333fred•2y ago

Give https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/tutorials/static-virtual-interface-members a read, and let us know if you have more questions 🙂

Explore static virtual members in interfaces

This advanced tutorial demonstrates scenarios for operators and other static members in interfaces.

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ What is the difference between public static and public static virtual in a interface?