從SQL到LINQ有很多聯接

Question

我正在努力將SQL查詢轉換為LINQ。

這是SQL：

SELECT dbo.ORGANIZATION.ORGANIZATION_ID, 
       dbo.ORGANIZATION.ORGANIZATION_NAME, 
             dbo.PWR_ORGANIZATION_DIRECTORY.DIRECTORY_IDENTIFIER, 
             dbo.DETAIL_REQUIREMENT.DETAIL_ID, 
       dbo.DETAIL_REQUIREMENT.DETAIL_IDENTIFIER, 
             dbo.PWR_ORGANIZATION_DIRECTORY_MAPPING.DIRECTORY_ATTRIBUTE, 
             dbo.PWR_ORGANIZATION_DIRECTORY_MAPPING.ATTRIBUTE_VALIDATION, 
       dbo.PWR_ORGANIZATION_DIRECTORY_MAPPING.ATTRIBUTE_TRANSFORMATION, 
             dbo.PWR_ORGANIZATION_DIRECTORY_MAPPING.DETAIL_ACCESS

FROM  dbo.ORGANIZATION INNER JOIN
      dbo.DETAIL_REQUIREMENT ON dbo.ORGANIZATION.ORGANIZATION_ID = dbo.DETAIL_REQUIREMENT.ORGANIZATION_ID INNER JOIN
      dbo.PWR_ORGANIZATION_DIRECTORY INNER JOIN
      dbo.PWR_ORGANIZATION_DIRECTORY_MAPPING ON dbo.PWR_ORGANIZATION_DIRECTORY.ORGANIZATION_ID = dbo.PWR_ORGANIZATION_DIRECTORY_MAPPING.ORGANIZATION_ID AND 
      dbo.PWR_ORGANIZATION_DIRECTORY.DIRECTORY_TYPE_ID = dbo.PWR_ORGANIZATION_DIRECTORY_MAPPING.DIRECTORY_TYPE_ID AND 
      dbo.PWR_ORGANIZATION_DIRECTORY.DIRECTORY_ID = dbo.PWR_ORGANIZATION_DIRECTORY_MAPPING.DIRECTORY_ID ON 
      dbo.DETAIL_REQUIREMENT.DETAIL_ID = dbo.PWR_ORGANIZATION_DIRECTORY_MAPPING.DETAIL_ID AND 
      dbo.ORGANIZATION.ORGANIZATION_ID = dbo.PWR_ORGANIZATION_DIRECTORY_MAPPING.ORGANIZATION_ID

WHERE dbo.ORGANIZATION.ORGANIZATION_ID = 0 AND 
      dbo.PWR_ORGANIZATION_DIRECTORY.DIRECTORY_ID = 1 AND 
            dbo.PWR_ORGANIZATION_DIRECTORY.DIRECTORY_TYPE_ID = 1

這就是我的開始方式，但是當表之間有兩個和三個聯接時，我感到困惑：

var megaFetch = from org in context.Organizations
            join detReq in context.DetailRequirements on org.OrganizationId equals detReq.OrganizationId
            join detMap in context.OrganizationDirectoryMappings on org.OrganizationId equals detMap.OrganizationId &&

有人可以在這里引導我嗎？

謝謝。

Answer 1

如果您需要在一個以上的列中連接一個表，請創建匿名類型，並且雙方具有相同數量的字段。 它應該像;

new {col1 = x.col1, col2 = x.col2, ...} equals new { col1 = y.col1, col2 = y.col2, ...}