將lambda作爲參數傳入庫法EFCore

Question

我試圖描述here

然而，沒有被列入的關係來實現倉庫的模式。

public IEnumerable<MyEntity> GetWithRelationship(params Expression<Func<MyEntity, object>>[] includeProperties) 
{ 
    var set = _context.MyEntities; 
    foreach (var includeProperty in includeProperties) 
    { 
    set.Include(includeProperty); 
    } 
    return set.ToList(); 
} 

然而，以下的工作：

return _context.MyEntities.Include(x => x.RelatedEntity).ToList(); 

Answer 1

你必須重新分配set到Include()方法的返回值。但是，爲了避免編譯錯誤，你必須把你的set爲IQueryable<MyEntity>第一：

var set = _context.MyEntities as IQueryable<MyEntity>; 

foreach (var includeProperty in includeProperties) 
{ 
    set = set.Include(includeProperty); 
} 

return set.ToList();