如何在.NETCore 3.1和Blazor中创建DbContextFactory

using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Design;
using Microsoft.Extensions.Configuration;
using System.IO;

public class YourDbContextFactory : IDesignTimeDbContextFactory<YourDbContext>
{
    public YourDbContext CreateDbContext(string[] args)
    {
        IConfigurationRoot configuration = new ConfigurationBuilder()
            .SetBasePath(Directory.GetCurrentDirectory())
            .AddJsonFile("appsettings.json")
            .Build();

        var optionsBuilder = new DbContextOptionsBuilder<YourDbContext>();
        optionsBuilder.UseSqlServer(configuration.GetConnectionString("YourConnectionString"));

        return new YourDbContext(optionsBuilder.Options);
    }
}

{
  "ConnectionStrings": {
    "YourConnectionString": "Server=(localdb)\\mssqllocaldb;Database=YourDatabase;Trusted_Connection=True;MultipleActiveResultSets=true"
  }
}

public class YourService
{
    private readonly YourDbContext _dbContext;

    public YourService()
    {
        var dbContextFactory = new YourDbContextFactory();
        _dbContext = dbContextFactory.CreateDbContext(null);
    }

    // 其他方法...
}