Program.cs

using NfcApi.Hubs;

var builder = WebApplication.CreateBuilder(args);
Func<IServiceProvider, IFreeSql> fsqlFactory = r =>
{
    IFreeSql fsql = new FreeSql.FreeSqlBuilder()
        .UseConnectionString(FreeSql.DataType.Sqlite, @"Data Source=musicdb.db")
        .UseMonitorCommand(cmd => Console.WriteLine($"Sql：{cmd.CommandText}"))//监听SQL语句
        .UseAutoSyncStructure(true) //自动同步实体结构到数据库，FreeSql不会扫描程序集，只有CRUD时才会生成表。
        .Build();
    return fsql;
};

// Add services to the container.
builder.Services.AddSingleton<IFreeSql>(fsqlFactory);

builder.Services.AddControllers();
// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen(); 
//添加SignalR服务
builder.Services.AddSignalR();

var app = builder.Build();

//Configure the HTTP request pipeline.
//if (app.Environment.IsDevelopment())
//{
//    app.UseSwagger();
//    app.UseSwaggerUI();
//}
app.UseSwagger();
app.UseSwaggerUI();

app.UseAuthorization();
//添加ChatHub中间件
app.MapHub<ChatHub>("/chatHub");
app.MapControllers();

app.Run();