How to apply a dynamic filter on ienumerable?

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Hi Guys,

How can i apply a filter on "IEnumerable"? "GetTaskAllocatedOnFilter" property list any value can be null basis on that i need a data

Please help, also let know if you guys want any other information to proved me solution on this

What I have tried:

public class GetTaskAllocatedOnFilter
{
public Guid? Project_ID { get; set; }
public Guid? Emp_ID { get; set; }
public Guid? Task_ID { get; set; }
}
public IEnumerable<task_allocationmodel> GetTaskAllocatedList(GetTaskAllocatedOnFilter getOnFilter)
{
_DALTaskAllocation = new DALTaskAllocation();
DataTable taskAllocatedList = _DALTaskAllocation.GetTaskAllocatedList(getOnFilter);
IEnumerable<task_allocationmodel> IEtaskAllocationList = taskAllocatedList.AsEnumerable().Select(row => new Task_AllocationModel() {
Emp_ID = new Guid(row["Emp_ID"].ToString()),
Emp_Name = row["Emp_Name"].ToString(),
Hrs = Convert.ToInt16(row["Hrs"]),
Location = row["Location"].ToString(),
Location_ID = Convert.ToInt16(row["Location_ID"]),
Month = Convert.ToInt16(row["Month"].ToString()),
Project_ID = new Guid(row["Project_ID"].ToString()),
Project_Name = row["Project_Name"].ToString(),
Reporting_Manager = row["Reporting_Manager"].ToString(),
Task_ID = new Guid(row["Task_ID"].ToString()),
Total = Convert.ToInt16(row["Total"].ToString()),
Type_ID = Convert.ToInt16(row["Type_ID"].ToString()),
Year = Convert.ToInt16(row["Year"].ToString()),
Createddate = Convert.ToDateTime(row["Createddate"].ToString()),
CreatedBy = row["CreatedBy"].ToString()
});
if ((Guid.Empty == getOnFilter.Emp_ID && Guid.Empty == getOnFilter.Project_ID) && Guid.Empty != getOnFilter.Task_ID)

if ((Guid.Empty == getOnFilter.Emp_ID && Guid.Empty == getOnFilter.Task_ID) && Guid.Empty != getOnFilter.Project_ID)

if ((Guid.Empty == getOnFilter.Project_ID && Guid.Empty == getOnFilter.Task_ID) && Guid.Empty != getOnFilter.Emp_ID)

if ((Guid.Empty == getOnFilter.Project_ID && Guid.Empty == getOnFilter.Task_ID) && Guid.Empty != getOnFilter.Emp_ID)

return IEtaskAllocationList;
}

Posted 4-Feb-17 5:31am

nik varma

Updated 4-Feb-17 5:35am

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Thomas Daniels · Answer 1 · 2017-02-04T05:35:00

You can use the .Where extension method: Enumerable.Where(TSource) Method (IEnumerable(TSource), Func(TSource, Boolean)) (System.Linq)[^]:

C#

using System.Linq;

// Example: 
IEnumerable<int> old = new int[] { 0, 1, 2, 3 };
IEnumerable<int> _new = old.Where(x => x != 0);

In the above example, _new will contain all elements from old except 0: the predicate for x is x != 0. You can adapt this filtering example to your codebase.