方法''没有支持转换为SQL

我想在linq的sql查询where子句中检查public int。我得到这个错误：方法'Int32 isInDept（System.String）'没有支持到SQL的转换。方法''没有支持转换为SQL

依稀相关的类（从公共静态类称为广告）：

//get AD property 
    public static string GetProperty(this Principal principal, String property) { 
     DirectoryEntry directoryEntry = principal.GetUnderlyingObject() as DirectoryEntry; 
     if (directoryEntry.Properties.Contains(property)) 
      return directoryEntry.Properties[property].Value.ToString(); 
     else 
      return String.Empty; 
    } 

    public static string GetDepartment(this Principal principal) { 
     return principal.GetProperty("department"); 
    }

中的类问题（从不同的类）：

public int isInDept(string department) { 
     PrincipalContext domain = new PrincipalContext(ContextType.Domain); 
     UserPrincipal userPrincipal = UserPrincipal.FindByIdentity(domain, GetUserId()); 

     if (department == userPrincipal.GetDepartment()) { 
      return 3; 
     } 
     else { return 2; } 
    } 

    public intranetGS.viewArticle viewArticle(int id) { 
     string user = GetUserId(); 

     var result = (from a in n.articles 
         join s in n.sections on a.section equals s.section_id 
         join p in n.privacies on a.privacy equals p.privacy_id 
         let iid = isInDept(s.name) 
         where (a.active == true && a.article_id == id && a.privacy < iid) || 
         (a.active == true && a.article_id == id && a.privacy == 3 && a.author == user) 
         select new intranetGS.viewArticle { 
          articleId = a.article_id, 
          title = a.title, 
          author = a.author, 
          html = a.html, 
          section = s.name, 
          privacy = p.name, 
          dateCreated = a.date_created, 
          dateModified = a.date_modified, 
          userCreated = a.user_created, 
          userModified = a.user_modified 
         }).First(); 

     var nv = (from v in n.navs 
          join s in n.sections on v.section equals s.section_id 
          let iid = isInDept(s.name) 
          where (v.active == true && s.name == result.section && v.privacy < 3) || 
          (v.active == true && s.name == result.section && v.privacy == iid && v.user_created == user) 
          select v.html); 

     StringBuilder sb = new StringBuilder(); 

     foreach (var r in nv) { 
      sb.Append(nv); 
     } 

     result.articleNav = sb.ToString(); 

     return result; 
    }

我在做什么错？如果我不能这样做，它是如何被建议完成的？

来源

2013-10-15 shubniggurath

那么您希望将该方法转换为什么SQL？ – Servy

我想要确定isInDept（）。最终的问题是，隐私级别可能是3（如果用户不在给定部门）或2（如果用户在给定部门）。我想我不完全理解这个问题。 – shubniggurath

写出希望将查询翻译成的SQL。就这么简单。我看不到任何可能的方式来处理那些代码。很明显，linq到sql查询提供者都不是。 – Servy

将函数转换为SQL是不可能的，一种解决方法是使用linq将大部分查询转化为sql，然后将Linq用于其他对象。它应该是这样的：

var query = (from a in n.articles 
         join s in n.sections on a.section equals s.section_id 
         join p in n.privacies on a.privacy equals p.privacy_id 
         where (a.active == true && a.article_id == id) 
         select new intranetGS.viewArticle { 
          articleId = a.article_id, 
          title = a.title, 
          author = a.author, 
          html = a.html, 
          section = s.name, 
          privacy = p.name, 
          privacyId = a.privacy, 
          dateCreated = a.date_created, 
          dateModified = a.date_modified, 
          userCreated = a.user_created, 
          userModified = a.user_modified 
         }).ToList();

然后过滤列表：

var result = query.Where(a => (a.privacyId < isInDept(a.section)) || 
         (a.privacyId == 3 && a.author == user)).First();

然后你可以在第二个查询这样做。

来源

2013-10-15 21:09:51

方法''没有支持转换为SQL

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