ASP.NET Web API 搜索多个表格

Question

我有一个搜索功能，可以在两个相关的 table 和一个不相关的 table 中搜索特定的词。 Owner table 和 Registration table 是相关的，而 Vehicle table 与其他两个 table 没有关系。我尝试了多种方法来解决这个问题，但没有一种有效。下面是有问题的代码。

到目前为止我尝试的是将三个 table 放在一个 ViewModel 中并在我的控制器搜索方法中调用它。

Owner Table
public int OwnerId {get;set;}
public string FirstName {get;set;}
public string LastName {get;set;}

Registration Table
public int RegistrationId {get; set;}
public DateTime RegisteredDate {get; set;}
public string RegistrationLocation {get;set;}
public int OwnerId {get;set;}

Vehicle Table
public int VehicleId {get;set;}
public string VehicleName {get;set;}
public DateTime VehicleYear {get;set;}
public string Model {get;set;}

SearchViewModel

public IEnumerable<Owner> Owners {get;set;}
public IEnumerable<Registration> Registrations {get;set;}
public IEnumerable<Vehicle> Vehicles {get;set;}

Controller

[HttpGet]
 public SearchViewModel Search(string searchString)
{ 
   SearchViewModel searchVM = new SearchViewModel();
   searchVM.Owner = searchVM.Owner.Where(o => o.FirstName.Contains(searchString));
   searchVM.Registration = searchVM.Registration.Where(r => r.RegistrationLocation.Contains(searchString));
   searchVM.Vehicle = searchVM.Vehicle.Where(v => 
   v.Model.Contains(searchString));

   return searchVM;
}

我试过的另一种方法是：

[HttpGet]
 public IActionResult Search(string searchString)
{ 

 var owner = from owners in _context.Owner select owners; 
 var registration = from registrations in _context.Registration select 
 registrations; 
 var vehicle = from vehicles in _context.Vehicle select vehicles; 


   owner = owner.Where(o => o.FirstName.Contains(searchString));
   registration = registration.Where(r => 
   r.RegistrationLocation.Contains(searchString));
   vehicle = vehicle.Where(v => 
   v.Model.Contains(searchString));

   return Ok(); //I'm not sure how to return the three.
}

Answer 1

结合你的两次尝试。在第一次尝试中，您正在构建视图模型，但不查询数据库。在第二次尝试中，您正在查询数据库，但没有构建视图模型。两者都做。

例如：

var searchVM = new SearchViewModel();

searchVM.Owners = _context.Owner.Where(o => o.FirstName.Contains(searchString));
searchVM.Registrations = _context.Registration.Where(r =>  r.RegistrationLocation.Contains(searchString));
searchVM.Vehicles = _context.Vehicle.Where(v => v.Model.Contains(searchString));

return searchVM;

ASP.NET Web API 搜索多个表格

ASP.NET Web API searching multiple tables

c#

linq-to-entities

full-text-search

asp.net-web-api