c# - 连接字符串中的 MultipleActiveResultSets 是什么意思？

Question

我想了解 Multiple Active Result Sets 我已经阅读了 Microsoft 文档，但是如果您可以添加一些有关 MultipleActiveResultSets 的示例，我不是很了解。

When MARS is enabled for use with SQL Server, each command object usedadds a session to the connection. I didn't understand it.

一般来说，什么时候应该在连接字符串中使用“MultipleActiveResultSets”？

例如，我已将这段代码用于迁移数据库，但出现了一些错误。

Keyword not supported: "MultipleActiveResultSets"

  public static void Main(string[] args)
        {
            var host = CreateHostBuilder(args).Build();
            using(var scope = host.Services.CreateScope())
            {
                var services = scope.ServiceProvider;
                try
                {
                    var context = services.GetRequiredService<DataContext>();
                    context.Database.Migrate();
                }
                catch (Exception ex)
                {
                    var logger = services.GetRequiredService<ILogger<Program>>();
                    logger.LogError(ex, "An error occured during migration.");
                    
                }
            }
            host.Run();
        }

---

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  "AllowedHosts": "*",
  "ConnectionStrings":{
      "DBConnection": "server=.;database=ReactivityDB;MultipleActiveResultSet=true;Trusted_Connection=True"
  }
    

Answer 1

根据您的错误信息:

Keyword not supported: 'multipleactiveresultset'

和你的连接字符串:

...database=ReactivityDB;MultipleActiveResultSet=true...

该关键字应为复数形式:

...database=ReactivityDB;MultipleActiveResultSets=true...