c# - 如何同步使用 UserManager？

Question

这个问题在这里已经有了答案:





How would I run an async Task<T> method synchronously?

(25 个回答)


3个月前关闭。




在我的其中之一 IDatabaseInitializer在 Seed给我的方法 DbContext我将初始数据插入数据库。除其他外，还有一些用户需要初始化。但据我使用 Microsoft.AspNet.Identity.EntityFramework.UserStore与 Microsoft.AspNet.Identity.UserManager它只有异步方法 DbUpdateConcurrencyException如下:

private static void CreateUser(DbContext context, string[] roles, string userName, string userEmail) {

    // given context is 
    var user = new ApplicationUser { /* ... fields init */  };

    var userStoreAdapter = new ApplicationUserRepository(context);
    var manager = new UserManager<ApplicationUser>(userStoreAdapter);

    // pass the creation to manager by calling it synchronously. See UserManagerExtensions
    manager.Create(user, Domain.Constants.DefaultPassword);
    manager.AddToRoles(user.Id, roles);

    context.SaveChanges(); // throws DbUpdateConcurrencyException. See another approach below.
}

所以问题是是否有办法使用 UserManager与 DbContext没有并发问题？

我尝试了以下来自 Optimistic Concurrency Patterns 的方法但这不会创建用户:

bool isSaved = true;
do
{
    try
    {
        context.SaveChanges();
        isSaved = true;
    }
    catch (DbUpdateConcurrencyException ex)
    {
        foreach (var entry in ex.Entries)
        {
            entry.Reload();
        }
        isSaved = false;
    }
} while (!isSaved);

Answer 1

var result = Task.Run(() => {
   /*whatever you want here*/
}).Result;

// Do whatever u want with the result after