我需要根据复选框列表选择特定列

我有一个复选框列表，用户可以选中或取消选中复选框。

根据选中的复选框，我用以逗号分隔的方式存储该值。 现在问题是基于我需要单独获取该特定列的选中复选框。 在“选择”**

db.Tasks.OrderBy(t => t.CreatedDate).ToList() .Select(t => new { Id = t.Id, PriorityId = t.ProjectId, Priority = t.Priority, StatusId = t.StatusId, Status = t.Status, EstimatedTime = t.EstimatedTime, ActualTime = t.ActualTime, Subject = t.Subject, FileName = t.FileName, AssignedTo = t.AssignedTo, Project = t.Project }).ToList(); 

如果我选中复选框列表ActualTime，Subject，它应该是

 db.Tasks.OrderBy(t => t.CreatedDate).ToList() .Select(t => new { Id = t.Id, ActualTime = t.ActualTime, Subject = t.Subject }).ToList(); 

如果我选中复选框列表主题，FileName，AssignedTo，它应该是

 db.Tasks.OrderBy(t => t.CreatedDate).ToList() .Select(t => new { Id = t.Id, Subject = t.Subject, FileName = t.FileName, AssignedTo = t.AssignedTo }).ToList(); 

选择将基于选中的复选框列表动态。

Answer 1

将DynamicLibrary.cs添加到您的项目中。 你可以从这个链接获得它。 它是一个包含动态链接源的zip文件。 这不是一个dll。 最初发布在ScottGu的博客上。 供参考，请参阅此堆栈溢出链接 。

  using System.Linq.Dynamic; public class DynamicColumns : BaseEntity { public string User { get; set; } public string TaskId { get; set; } public string Project { get; set; } public string Priority { get; set; } public string TaskType { get; set; } public string Version { get; set; } public string Module { get; set; } public string Subject { get; set; } public string Details { get; set; } public string FileName { get; set; } public string Status { get; set; } public string AssignedBy { get; set; } public string AssignedTo { get; set; } public int ActualTime { get; set; } public int LogWork { get; set; } public DateTime CreatedDate { get; set; } public DateTime AssignedDate { get; set; } public DateTime ResolveDate { get; set; } public int EstimatedTime { get; set; } } public enum EnumTasks { User = 1, Project = 2, Priority = 3, TaskType = 4, Version = 5, Module = 6, Subject = 7, Details = 8, Status = 9, Assigned_By = 10, Assigned_To = 11, Created_Date = 12, Assigned_Date = 13, Resolve_Date = 14, Estimated_Time = 15, Actual_Time = 16, LogWork = 17 } public IQueryable DynamicSelectionColumns() { using (var db = new TrackerDataContext()) { string fieldIds = "," + "4,5,3,2,6,17,11,12" + ","; var taskColum = Enum.GetValues(typeof(EnumTasks)).Cast().Where(e => fieldIds.Contains("," + ((int)e).ToString() + ",")).Select(e => e.ToString().Replace("_", "")); string select = "new ( TaskId, " + (taskColum.Count() > 0 ? string.Join(", ", taskColum) + ", " : "") + "Id )"; return db.Task.ToList().Select(t => new DynamicColumns() { Id = t.Id, TaskId = Project != null ? Project.Alias + "-" + t.Id : t.Id.ToString(), ActualTime = t.ActualTime, AssignedBy = t.AssignedBy.ToString(), AssignedDate = t.AssignedDate, AssignedTo = t.AssignedTo.ToString(), CreatedDate = t.CreatedDate, Details = t.Details, EstimatedTime = t.EstimatedTime, FileName = t.FileName, LogWork = t.LogWork, Module = t.Module != null ? t.Module.Name : "", Priority = t.Priority != null ? t.Priority.Name : "", Project = t.Project != null ? t.Project.Name : "", ResolveDate = t.ResolveDate, Status = t.Status != null ? t.Status.Name : "", Subject = t.Subject, TaskType = t.TaskType != null ? t.TaskType.Type : "", Version = t.Version != null ? t.Version.Name : "" }).ToList().AsQueryable().Select(select); } }