Program to convert Entity Frameworks ObjectResult to Generic List

Posted by Niladri.Biswas under C# category on | Points: 40 | Views : 11138
I have a requirement where I need to convert a ObjectResult of Entity Framework to Generic list . Here is my attempt

public class Utility
/// <summary>
/// Function: ToList
/// Converts ObjectResult to Generic List
/// </summary>
/// <typeparam name="T1"></typeparam>
/// <typeparam name="T2"></typeparam>
/// <param name="Source"></param>
/// <param name="Destination"></param>
public static void ToList<T1, T2>(ObjectResult<T1> Source, List<T2> Destination) where T2 : new()
Destination.AddRange(Source.Select(CreateMapping<T1, T2>()));

/// <summary>
/// CreateMapping
/// Creates the mapping
/// </summary>
/// <typeparam name="T1"></typeparam>
/// <typeparam name="T2"></typeparam>
/// <returns></returns>
private static Func<T1, T2> CreateMapping<T1, T2>() where T2 : new()
var typeOfSource = typeof(T1);
var typeOfDestination = typeof(T2);

// use reflection to get a list of the properties on the source and destination types
var sourceProperties = typeOfSource.GetProperties();
var destinationProperties = typeOfDestination.GetProperties();

// join the source properties with the destination properties based on name
var properties = from sourceProperty in sourceProperties
join destinationProperty in destinationProperties
on sourceProperty.Name.ToUpper() equals destinationProperty.Name.ToUpper()
select new { SourceProperty = sourceProperty, DestinationProperty = destinationProperty };

return (x) =>
var y = new T2();

foreach (var property in properties)
var value = property.SourceProperty.GetValue(x, null);
property.DestinationProperty.SetValue(y, value, null);

return y;


First create an entity say (Employee)

public class Employee
public int EmpId { get; set; }
public string EmpName { get; set; }
public string EmpAddress { get; set; }
public string EmpPhoneNumber { get; set; }


Then invoke the function as under

var lstEmployee= new List<Employee>();

//Obtain the data from EntityFramework. This will give the data as ObjectResult format
var lstEmployeeDataFromEntitiFramework = context.GetEmployeeRecords();

//Do the transformation
Utility.ToList(lstEmployeeDataFromEntitiFramework, lstEmployee);

Hope this will be helpful.

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