Autofac MVC5 webapi 并发

最新推荐文章于 2024-11-15 18:20:16 发布

原创最新推荐文章于 2024-11-15 18:20:16 发布 · 689 阅读

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本文探讨了在异步场景下使用Autofac时遇到的并发问题，详细介绍了如何通过添加作用域来避免Connectionmustbevalidandopen及MySqlException错误的发生。

参考：https://stackoverflow.com/questions/10027330/how-to-resolve-autofac-instanceperhttprequest

后台是异步处理，前端使用axios同时发送了两个请求上来，结果报错

Connection must be valid and open.

MySqlException: There is already an open DataReader associated with this Connection which must be closed first.

其实错误的问题在于，异步场景下，自己Resolver的，需要加一个scope

private async Task<ClaimsPrincipal> GetIdentityByToken(HttpActionContext context, long userId)
{
	UserIdentity result = null;
	// 注意此处要加scope,不能直接用(ILoginService)config.DependencyResolver.GetService(typeof(ILoginService));
	// 否则并发时会有错误发生
	var config = context.ControllerContext.Configuration;
	using (var scope = config.DependencyResolver.BeginScope())
	{
		var loginService = (ILoginService)scope.GetService(typeof(ILoginService));
		result = await loginService.GetUserClaimsIdentity(userId, AppCode);
	}  

    //using (var httpRequestScope = IocConfig.IOCContainer.BeginLifetimeScope("httpRequest"))
    //{
    //    var loginService = httpRequestScope.Resolve<ILoginService>();
    //    result = await loginService.GetUserClaimsIdentity(userId, AppCode);
    //}              

	if (result != null)
	{
		var principal = new MyPrincipal(result);
		context.ControllerContext.RequestContext.Principal = principal;
		return principal;
	}
	else
	{
		return null;
	}	
}