sql-server - 在 Azure 上运行 MVC4 时出错

Question

我们有时会在 Azure 上启动 MVC4 站点时遇到错误。在我们的本地服务器上从未见过这些错误。将数据库和应用程序部署到 Azure 后，如果请求授权并且在站点上处于不活动状态一段时间后，启动主页时会出现问题(可能由超时引起的错误)。代码很简单，如下所示:

[InitializeSimpleMembership]
[Authorize(Roles = "Administrator")]
public class HomeController : Controller
{
    public ActionResult Index()
    {
        return View();
    }
}

请求主页有时会失败:

[Win32Exception (0x80004005): Access is denied]

[SqlException (0x80131904): A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)]
....
System.Data.SqlClient.SqlConnection.Open() +96
System.Web.DataAccess.SqlConnectionHolder.Open(HttpContext context, Boolean revertImpersonate) +88
System.Web.DataAccess.SqlConnectionHelper.GetConnection(String connectionString, Boolean revertImpersonation) +239
System.Web.Security.SqlRoleProvider.GetRolesForUser(String username) +762
WebMatrix.WebData.SimpleRoleProvider.GetRolesForUser(String username) +54
...

如何防止此(超时)错误？感谢您的帮助!

Answer 1

将以下行从 InitializeSimpleMembershipAttribute.cs(过滤器)移至 AuthConfig.cs:

WebSecurity.InitializeDatabaseConnection("DefaultConnection", "UserProfile", "UserId", "UserName", autoCreateTables: true);

所以代码将如下所示:

public static class AuthConfig
{
    public static void RegisterAuth()
    {
        WebSecurity.InitializeDatabaseConnection("DefaultConnection", "UserProfile", "UserId", "UserName", autoCreateTables: true);
        ...

也许您的 web.config(system.web 部分)中还需要以下内容:

<roleManager enabled="true" defaultProvider="SimpleRoleProvider">
 <providers>
  <clear/>
  <add name="SimpleRoleProvider" type="WebMatrix.WebData.SimpleRoleProvider, WebMatrix.WebData"/>
 </providers>
</roleManager>
<membership defaultProvider="SimpleMembershipProvider">
 <providers>
  <clear/>
  <add name="SimpleMembershipProvider" type="WebMatrix.WebData.SimpleMembershipProvider, WebMatrix.WebData" />
 </providers>
</membership>