合并linq结果

Question

我得到了这2个linq查询。有没有简单的方法来合并这两个查询。所以，当我使用我的下拉列表，我可以得到一个结果，如果两者都返回true？

public void CategorySort() 
{ 
    var categoryId = int.Parse(ddlCat.SelectedValue); 

    var data = new MyModelContext(); 

    var cat = from c in data.tblDocuments 
       join sc in data.tblSubCategories on c.DocId equals sc.DocId 
       where sc.CategoryId == categoryId 
       select c; 

    rptResult.DataSource = cat.ToList(); 
    rptResult.DataBind(); 
} 

public void SortPerson() 
{ 
    var personId = int.Parse(ddlPerson.SelectedValue); 
    var data = new MyModelContext(); 


    var documents = from d in data.tblDocuments 
        join sp in data.tblSubPersons on d.DocId equals sp.DocId 
        where sp.PersonId == personId 
        select d; 

    rptResult.DataSource = documents.ToList(); 
    rptResult.DataBind(); 

} 

Answer 1

这是一个简单的例子，说明如何找到一个文件，它可以被类别或者子类匹配。

var cat = from c in data.tblDocuments 
      join sc in data.tblSubCategories on c.DocId equals sc.DocId 
      join sp in data.tblSubPersons on c.DocId equals sp.DocId 
      where sc.CategoryId == categoryId || sp.PersonId == personId 
      select c; //This needs to change to be what you want to select 

Answer 2

加入到两者中并使用&&运算符来检查两个子记录。

var cat = from c in data.tblDocuments 
      join sc in data.tblSubCategories on c.DocId equals sc.DocId 
      join sp in data.tblSubPersons on d.DocId equals sp.DocId 
      where sc.CategoryId == categoryId && sp.PersonId == personId 
      select c;