我可以从您那里找到有用的答案。我有WPF应用程序从API提取数据，我在执行以下代码时遇到线程死锁
private List<Clinic> _clinics;
public List<Clinic> Clinics {
get { return _clinics; }
set { _clinics = value; OnPropertyChanged(); }
}
private Clinic _selectedClinic;
public Clinic SelectedClinic {
get { return _selectedClinic; }
set {
_selectedClinic = value; OnPropertyChanged();
if (value != null)
OnSelectClinic(value).Wait();
}
}
private async Task OnSelectClinic(Clinic clinic) {
try {
using (var request = await Client.GetAsync("URL OF API")) {
if (request.IsSuccessStatusCode){
StaffList = await request.Content.ReadAsAsync<Staff>();
}
var error = await request.Content.ReadAsStringAsync();
throw new Exception(error);
}
} catch (Exception e) {
Debug.WriteLine(e);
}
}
这是视图模型，并且Clinics，selectedClinic和Staff都绑定到View.XAML
这里是API方法
[HttpGet("FindAllByClinic/{clinicId}")]
public async Task<IActionResult> FindAllByClinic(int clinicId) {
try {
return Ok(_mapper.Map<List<Staff>>(await _staffRepository
.FindAllBy(clinicId)));
} catch (Exception e) {
return BadRequest(e.Message);
}
}
这里是StaffRepository方法：
public async Task<ICollection<Staff>> FindAllBy(int clinicId, int medicalPointId) {
var persons = await Context.Persons.FromSql("EXEC HR.GetPersonsByClinicId @ClinicId = 0," +
$"@EncryptPassword = '{DecryptPassword}'").ToListAsync();
var staffs = await Context.Staff
.Include(e => e.StaffClinics)
.ThenInclude(e => e.Clinic)
.ThenInclude(e => e.ClinicMedicalPoints)
.Where(e => e.StaffClinics.Any(c => c.ClinicId == clinicId
&& c.Clinic.ClinicMedicalPoints.Any(m => m.MedicalPointId
== medicalPointId)))
.ToListAsync();
foreach (var staff in staffs) {
staff.Person = persons.FirstOrDefault(e => e.Id == staff.PersonId);
}
return staffs;
}
问题是，当我从组合框选择诊所时，整个应用程序冻结如果我有任何错误，谁能给我建议或更正我的代码]
public Clinic SelectedClinic {
get { return _selectedClinic; }
set {
_selectedClinic = value; OnPropertyChanged();
if (value != null)
OnSelectClinic(value).Wait();
}
}
此设置程序非常糟糕，因为：
它引发一个带有OnPropertyChanged的事件-没关系-但随后它将继续在二传手身上执行昂贵的操作。您已经在发起一个事件，也许有些人应该订阅该事件并执行OnSelectClinic？
You're blocking on async code, which is a sin that causes deadlocks。通常，解决方案是用async代替阻塞等待，但是在这种情况下，您需要重新设计，以使属性设置器不负责触发和等待此操作。