0

请考虑下表：

Tbl文档

docID,  levelID, name 
101,    201,     AAA 
102,    201,     BBB 
103,    201,     CCC 
104,    202,     DDD 
105,    202,     EEE

表页

pgID, docID, pgNo
1,    101,   1
2,    102,   1
3,    102,   2
4,    103,   1
5,    104,   1
6,    105,   1

字段名称

fieldNameID, levelID, fieldName  
1,           201,     WrittenBy  
2,           201,     VerifiedBy 
3,           201,     DocumentName

字段值

docID,  fieldNameID, fieldValue 
101,    1,           James 
101,    2,           Bond  
101,    3,           Essay on something  
102,    1,           Krister
102,    2,           Holm
102,    3,           Dame it or not!  

public class Document
{
  public int DocID {get; set;}
  public int LevelID {get; set;}
  public string Name {get; set;}

  public List<Field> Metadata
  {
     get { return (_fields); }
     set { _fields = value; }
  }       
  private List<Field> _fields = new List<Field>();
}


public class Field
    {
      public FieldNameID {get; set;}
      public FieldName {get; set;}
      public FieldValue {get; set;}
    }

现在，我正在尝试使用运行良好的 linq 从数据库中获取数据。

using (DBDataContext context = new DBDataContext())
{
  List<Document> doc  = (from d in context.TblDocuments
     join p in context.TblPages on d.docID equals p.docID into dpgrp
     from dp in dpgrp.Where(f => f.docID == d.docID).DefaultIfEmpty()
     where d.levelID == 201
     select new Document
     {
       DocumentID = d.docID,
       LevelID = d.levID
     }).ToList<Document>();
 }

有人可以帮助我如何获取列表中的字段值吗？

using (DBDataContext context = new DBDataContext())
{
  List<Document> doc  = (from d in context.TblDocuments
     join p in context.TblPages on d.docID equals p.docID into dpgrp
     from dp in dpgrp.Where(f => f.docID == d.docID).DefaultIfEmpty()
     where d.levID == 201
     select new Document
     {
       DocumentID = d.docID,
       LevelID = d.levID
       Metadata = ???????            // how to achieve this? as it is a list
     }).ToList<Document>();
 }
4

1 回答 1

0

我建议DataLoadOptions用于 L2S

options.LoadWith<Document>(d => d.Metadata);
于 2013-01-07T13:03:23.073 回答