我已经创建了一个接口,它具有两个派生类,如下面的代码片段所示,我想访问Linq
查询中那些派生类的成员,但我无法这样做。从Linq查询中的接口访问派生类的属性?
模型类结构:
List<IDirDetails> data = LoadData();
int totalRecords = data.Count;
if (!string.IsNullOrEmpty(search) && !string.IsNullOrWhiteSpace(search))
{
// Apply search
data = data.Where(p => p.FileName.ToString().ToLower().Contains(search.ToLower()) || //not allowing to access FileName
p.FileSize.ToLower().Contains(search.ToLower()) || //not allowing to access FileSize
p.FileModified.ToString().ToLower().Contains(search.ToLower())).ToList(); //not allowing to accessFileModified
}
下面
是我如何LoadData()
public List<IDirDetails> LoadData()
{
string userName = HttpContext.User.Identity.Name;
var user = _context.Users.FirstOrDefault(m => m.UserName == userName);
string[] appList = null;
var allDirDetails = new List<IDirDetails>(); //obj of an Interface
var allAppExist = _context.UserApplications.Any(ua => ua.AppId == 17 && ua.UserId == user.Id);
appList = (from a in _context.Applications
join ua in _context.UserApplications on a.Id equals ua.AppId
where ua.UserId == user.Id
select a.AppName).ToArray();
DirectoryDetails dirDetails = new DirectoryDetails();
dirDetails.ApplicationList = appList;
List<DirectoryItemInfo> dirItems = new List<DirectoryItemInfo>();
dirDetails.Items = dirItems;
allDirDetails.Add(dirDetails); // adding values into DirectoryDetails
string requestPath = Request.Path.Value;
string[] requestPathParts = requestPath.Split(new string[] { "/" }, StringSplitOptions.RemoveEmptyEntries);
dirDetails.PathElements = requestPathParts;
var aapId = _context.Applications.FirstOrDefault(a => a.AppName == requestPathParts[0].ToString());
string[] physicalPaths = (from ap in _context.ApplicationPathElements
join a in _context.Applications on ap.AppId equals a.Id
where a.Id == aapId.Id
select ap.AppPathElement).ToArray();
if (physicalPaths != null && physicalPaths.Length > 0)
{
foreach (string indexPath in physicalPaths)
{
DirectoryItemInfo details = GetDirectoryInfo(indexPath, indexPath + "/", DateTime.MinValue);
allDirDetails.Add(details); // adding values into DirectoryItemInfo
}
}
return allDirDetails;
}
设定值这些类:其中我试图访问这些成员
public interface IDirDetails
{
}
public class DirectoryDetails: IDirDetails
{
public string[] PathElements { get; set; }
public string[] ApplicationList { get; set; }
public List<DirectoryItemInfo> Items { get; set; }
}
public class DirectoryItemInfo: IDirDetails
{
public string FileName { get; set; }
public string FileType { get; set; }
public string FileSize { get; set; }
public string FileIcon { get; set; }
public DateTime FileModified { get; set; }
public string FilePath { get; set; }
}
代码形式
有人可以请建议我应该如何访问所需的衍生成员一个接口的ved类?对您的问题
谢谢你的回答,先生,可以请你提出正确的方式实现这些? –
@RahulNagrale我不'不要看到你的整个代码,我在答案中提出了一个建议,但这取决于你在做什么。 –
当我从LoadData()返回'List'时出现错误,错误:'CS0029 \t无法隐式地将类型'System.Collections.Generic.List 转换为'System .Collections.Generic.List ' –