Question

我在ASP MVC中创建了一个actionresult，它应该显示与我的Linq查询匹配的记录。它正常工作，直到我添加：

records.State == '0' &&

此查询（在t-sql中）在SQL管理工作室中返回正确的结果，但不与Linq一起返回：

   public ActionResult Index(string q)
    { 
               viewModel.Records = from records in db.records
                                   where records.State == '0' &&
                                   records.Title.Contains(q)
                                   || records.Title.Contains(q)
                                   ||records.Project.Contains(q)
                                   || records.Owner.Contains(q)
                                   || records.Number.Contains(q)
                                   select events;
    }

Answer 1

小心你的逻辑。如果你想要的是

records.State == '0' && [whatever previous logic you have]

您应该将所有先前的逻辑放在括号中：

viewModel.Records = from records in db.records
                   where records.State == '0' &&
                   (records.Title.Contains(q)
                   || records.Project.Contains(q)
                   || records.Owner.Contains(q)
                   || records.Number.Contains(q))
                   select events;

另请注意，您有重复的条件records.Title.Contains(q)，我会在解决方案中将其删除。

此外，如果您的records.State是数字类型（例如int，而不是char/string），那么您不应该使用撇号，但应该直接使用该数字：

viewModel.Records = from records in db.records
                   where records.State == 0 &&
                   (records.Title.Contains(q)
                   || records.Project.Contains(q)
                   || records.Owner.Contains(q)
                   || records.Number.Contains(q))
                   select events;

Answer 2

请尝试以下

public ActionResult Index(string q)
{ 
           viewModel.Records = from records in db.records
                               where records.State == 0 &&
                              ( records.Title.Contains(q)
                               || records.Title.Contains(q)
                               ||records.Project.Contains(q)
                               || records.Owner.Contains(q)
                               || records.Number.Contains(q))
                               select events;
}

Answer 3

如果State属性属于char类型，您的代码将 ，因为'0'是char

如果State的类型为int / tinyint（字节），则应执行此操作

where records.State == 0 && records.Title.Contains(q)

Answer 4

您的Contains()来电看起来是正确的（尽管您有两次Title.Contains()），但您提到您的State属性是tinyint，因此您需要将其比较为这样的（而不是你以前的字符串）：

public ActionResult Index(string q)
{ 
           viewModel.Records = from records in db.records
                               where records.State == 0 && (records.Title.Contains(q)
                               ||records.Project.Contains(q)
                               || records.Owner.Contains(q)
                               || records.Number.Contains(q))
                               select events;
}

像运算符给出零结果

4 个答案: