I need to select a specific column based on a list of checkboxes

Question

I have a list of checkboxes in which the user can select or clear the checkbox.

Based on the selected flag, I used to store this value, separated by commas. Now the problem is based on the selected checkbox. I need to get this particular column. in "select" **

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(); 

if I select ActualTime, Subject from the checkbox, it should be like

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

if I select Subject, FileName, AssignedTo from the checkbox, it should look like

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

the selection will be dynamic depending on the selected list of flags.

Answer 1

add DynamicLibrary.cs to your project. You can get this from the link . This is a zip file containing a dynamic link source. This is not a dll. Originally posted on ScottGu's blog here . for reference see this stack overflow link .

  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<EnumTasks>().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); } }