带有自定义任务的C#任务重写函数
我有一个函数声明如下:带有自定义任务的C#任务重写函数,c#,async-await,task,C#,Async Await,Task,我有一个函数声明如下: public Task<PossibleUser> FindByNameAsync(string userName) { Task<PossibleUser> task = context.TabelaStudenti.Where( apu => apu.NrMatricol == userName) .FirstOrDefaultAsync(); return task; } Possib
public Task<PossibleUser> FindByNameAsync(string userName)
{
Task<PossibleUser> task = context.TabelaStudenti.Where(
apu => apu.NrMatricol == userName)
.FirstOrDefaultAsync();
return task;
}
PossibleUser user = await userManager.FindAsync(context.UserName, context.Password);
public Task<PossibleUser> FindByNameAsync(string userName)
{
return context.TabelaStudenti
.FirstOrDefaultAsync(st => st.NrMatricol == userName)
.ContinueWith(task =>
{
var studentUser = task.Result;
if (studentUser != null)
{
return new PossibleUser
{
Password = studentUser.Parola,
UserName = studentUser.UserName
};
}
//just return something else
return new PossibleUser();
});
}
它是ASP.NET Web API Owin身份验证的一部分,其中UserManager是
UserManagerFactory = () => new UserManager<PossibleUser>(new StudentStore()) { PasswordHasher = new MyPasswordHasher() };
UserManagerFactory=()=>newusermanager(newstudentstore()){PasswordHasher=newmypasswordhasher()};
您只是忘记启动新创建的任务:
public Task<PossibleUser> FindByNameAsync(string userName)
{
Student studentUser = context.TabelaStudenti.Where(st => st.NrMatricol == userName).FirstOrDefault();
Task<PossibleUser> someTask= new Task<PossibleUser>(() =>
{
if (studentUser == null)
{
return new PossibleUser()
{
Password = studentUser.Parola,
UserName = studentUser.UserName
};
}
else
{
//just return something else
return new PossibleUser();
}
});
// start your task
someTask.Start();
return someTask;
}
您可以使用以下内容:
public Task<PossibleUser> FindByNameAsync(string userName)
{
Task<PossibleUser> task = context.TabelaStudenti.Where(
apu => apu.NrMatricol == userName)
.FirstOrDefaultAsync();
return task;
}
PossibleUser user = await userManager.FindAsync(context.UserName, context.Password);
public Task<PossibleUser> FindByNameAsync(string userName)
{
return context.TabelaStudenti
.FirstOrDefaultAsync(st => st.NrMatricol == userName)
.ContinueWith(task =>
{
var studentUser = task.Result;
if (studentUser != null)
{
return new PossibleUser
{
Password = studentUser.Parola,
UserName = studentUser.UserName
};
}
//just return something else
return new PossibleUser();
});
}
公共任务FindByNameAsync(字符串用户名)
{
return context.TabelaStudenti
.FirstOrDefaultAsync(st=>st.NrMatricol==用户名)
.ContinueWith(任务=>
{
var studentUser=task.Result;
if(studentUser!=null)
{
返回新的可能用户
{
Password=studentUser.Parola,
UserName=studentUser.UserName
};
}
//还点别的吧
返回新的PossibleUser();
});
}
永远不要使用任务构造函数。只需使用
async
/wait
:
public async Task<PossibleUser> FindByNameAsync(string userName)
{
Student studentUser = await context.TabelaStudenti.FirstOrDefaultAsync(st => st.NrMatricol == userName);
if (studentUser != null)
{
return new PossibleUser()
{
Password = studentUser.Parola,
UserName = studentUser.UserName
};
}
else
{
//just return something else
return new PossibleUser();
}
}
公共异步任务FindByNameAsync(字符串用户名)
{
Student studentUser=wait context.TabelaStudenti.FirstOrDefaultAsync(st=>st.NrMatricol==userName);
if(studentUser!=null)
{
返回新的PossibleUser()
{
Password=studentUser.Parola,
UserName=studentUser.UserName
};
}
其他的
{
//还点别的吧
返回新的PossibleUser();
}
}