在运行时更改 OwinContext dbContext

change OwinContext dbContext on runtime

我需要 运行-time 更改 Request.GetOwinContext()dbContext 以使用特定的 connectionString 但它不起作用。

我有一个 dbContex class 接受来自 Web.Config 的默认 connectionString 或像这样的指定的:

public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
    public ApplicationDbContext()
        : base("AuthEntities", throwIfV1Schema: false)
    {
        Configuration.ProxyCreationEnabled = false;
        Configuration.LazyLoadingEnabled = false;
    }

    public ApplicationDbContext(string sConnectionString)
        : base(sConnectionString, throwIfV1Schema: false)
    {
        Configuration.ProxyCreationEnabled = false;
        Configuration.LazyLoadingEnabled = false;
    }

    public static ApplicationDbContext Create()
    {
        return new ApplicationDbContext();
    }

    public static ApplicationDbContext Create(string sConnectionString)
    {
        ApplicationDbContext test = new ApplicationDbContext(sConnectionString);
        return test;
    }

}

然后,当新用户注册时,我尝试使用新的 connectionString 更改 Owin 的默认 dbContext,如下所示:

[AllowAnonymous]
[Route("create")]
public async Task<IHttpActionResult> CreateUser(CreateUserBindingModel createUserModel)
{
     (...)

     //get the specific connectionString
     var connectionString = cService.GetCompanyConnectionString(createUserModel.Company);

     //generate new dbContext
     var appDbContext = ApplicationDbContext.Create(connectionString);

     //get OwinContext
     var context = HttpContext.Current.GetOwinContext();

     //replace the DbContext inside OwinContext
     context.Set<ApplicationDbContext>("ApplicationDbContext", appDbContext);

     (...)
}

直到并包括 appDbContext 一切都按预期工作,但在调试时,设置 context.Set<ApplicationDbContext>...context 仍在使用默认值。

我也尝试过使用 var context = Request.GetOwinContext(); 并直接设置为 HttpContext.Current.GetOwinContext().Set<ApplicationDbContext>("ApplicationDbContext", appDbContext);Request.GetOwinContext().Set<ApplicationDbContext>("ApplicationDbContext", appDbContext); 但我总是得到相同的结果。

这里的问题是我在设置时尝试使用的第一个字符串,所以这一行

context.Set<ApplicationDbContext>("ApplicationDbContext", appDbContext);

必须改为

context.Set<ApplicationDbContext>(appDbContext);