使用LINQ獲取基於字符串中多個字段的字段使用LINQ

Question

我有兩個表：表1：角色表和表2：特權表。

在RolesTable樣本數據

Name |Description   |ModulePrivIds|FunctionPrivIds|Active 
================================================================= 
Role1|This is a Test Role |1,2   |3,4   |1 
Role2|This is another Role |2,3   |1,3   |0 

注：ModulePrivId和FunctionPrivIds對應IDS在PrivilegeTable

樣本數據中PrivilegeTable

ID | Name |Description 
======================== 
1 |Priv1 |This is Priv1 
2 |Priv2 |This is Priv2 
3 |Priv3 |This is Priv3 
4 |Priv4 |This is Priv4 

現在我想在所有角色的網格中顯示數據。因此，我想使用特權表來顯示特權名稱，而不是ModulePrivId和FunctionPrivIds。

這是我正在嘗試，但無法達到預期的效果。

var answer = (from r in database.RolesRepository.Get() 
      join p in database.PrivilegesRepository.Get() 
      on r.ModulePrivilegeIds equals p.Id.ToString() into ModuleWisePrivileges 
      from p1 in ModuleWisePrivileges.DefaultIfEmpty() 

      from r1 in database.RolesRepository.Get() 
      join p01 in database.PrivilegesRepository.Get() 
      on r1.FunctionPrivilegeIds equals p01.Id.ToString() into FunctionWisePrivileges 
      from p2 in FunctionWisePrivileges.DefaultIfEmpty() 

      select new 
      { 
       Name = r.Name, 
       Description = r.Description, 
       ModuleWisePrivileges = ModuleWisePrivileges, 
       FunctionWisePrivileges = FunctionWisePrivileges, 
       Active = r.Active 

      }).ToArray(); 

return answer; 

我也試過以下，但沒有成功。

var answer = (from r in database.RolesRepository.Get() 
      join p in database.PrivilegesRepository.Get() 
      on p.Id.ToList().Where(p => Id.Contains(r.ModulePrivilegeIds.ToString()) into ModuleWisePrivileges) 
      from p1 in ModuleWisePrivileges.DefaultIfEmpty() 

      from r1 in database.RolesRepository.Get() 
      join p01 in database.PrivilegesRepository.Get() 
      on r1.FunctionPrivilegeIds equals p01.Id.ToString() into FunctionWisePrivileges 
      from p2 in FunctionWisePrivileges.DefaultIfEmpty() 

      select new 
      { 
       Name = r.Name, 
       Description = r.Description, 
       ModuleWisePrivileges = ModuleWisePrivileges, 
       FunctionWisePrivileges = FunctionWisePrivileges, 
       Active = r.Active 

      }).ToArray(); 

Answer 1

如果您不能修復數據庫，如果只剩下一個多步驟的過程：

1. 從RolesTable
2. 拆分選擇行ID字段
3. 從選擇的特權數據庫

類似這樣的：

var roles = database.RolesRepository.Get().ToArray(); 
var answers = roles.Select(r => new { 
       Name = r.Name, 
       Description = r.Description, 
       ModuleWisePrivileges = r.ModulePrivilegeIds.Split(',') 
             .Select(x => database.PrivilegesRepository.Get(x)) 
             .ToArray(), 
       FunctionWisePrivileges = r.FunctionPrivilegeIds.Split(',') 
              .Select(x => database.PrivilegesRepository 
                   .Get(x)) 
              .ToArray(), 
       Active = r.Active 
      } 

如果您的存儲庫允許您一次獲取多個項目，根據ID列表，可以提高性能。
如果特權的列表很小，倒不如讓他們都到內存第一：

var roles = database.RolesRepository.Get().ToArray(); 
var privileges = database.PrivilegesRepository.Get().ToDictionary(x => x.Id, x => x); 
var answers = roles.Select(r => new { 
       Name = r.Name, 
       Description = r.Description, 
       ModuleWisePrivileges = r.ModulePrivilegeIds.Split(',') 
             .Select(x => privileges[x]) 
             .ToArray(), 
       FunctionWisePrivileges = r.FunctionPrivilegeIds.Split(',') 
              .Select(x => privileges[x]) 
              .ToArray(), 
       Active = r.Active 
      } 

Answer 2

入住這一次，更新了上面的代碼用逗號分隔值

var roles = database.RolesRepository.Get().ToArray(); 
var answers = roles.Select(r => new { 
      Name = r.Name, 
      Description = r.Description, 
      ModuleWisePrivileges = string.Join(", ", (r.ModulePrivilegeIds.Split(',') 
            .Select(x => database.PrivilegesRepository.Get(x).FirstOrDefault()) 
            .ToArray()), 
      FunctionWisePrivileges = string.Join(", ", (r.FunctionPrivilegeIds.Split(',') 
             .Select(x => database.PrivilegesRepository.Get(x).FirstOrDefault()) 
             .ToArray()), 
      Active = r.Active 
     } 

更新根據你的意見查詢

var roles = database.RolesRepository.Get().ToArray(); 
var answers = roles.Where(a => a.isDeleted == false).Select(r => new { 
     Name = r.Name, 
     Description = r.Description, 
     ModuleWisePrivileges = string.Join(", ", (r.ModulePrivilegeIds.Split(',') 
           .Select(x => database.PrivilegesRepository.Get(x).FirstOrDefault()) 
           .ToArray()), 
     FunctionWisePrivileges = string.Join(", ", (r.FunctionPrivilegeIds.Split(',') 
            .Select(x => database.PrivilegesRepository.Get(x).FirstOrDefault()) 
            .ToArray()), 
     Active = r.Active 
    }