泛型C＃如何通过参数传递泛型对象的属性

Question

I have created this method but it has a problem that I couldn't sort it out.

How can I pass by parameter the predicate? Because "x.IsActive" and "source.Id" and "x.Id" vary, normally all the objects I will pass by parameter have IsActive and Id properties.

 public static Differences<T> CheckChanges<T>(List<T> sourceTable, List<T> destinationTable)
    {
        var differences = new Differences<T>();

        foreach (var sourceItem in sourceTable.Where(x => x.IsActive))
        {
            var destinationItem = destinationTable.FirstOrDefault(x => x.Id == sourceItem.Id);
        }

        return differences;
    }

Answer 1

If you can make all your objects inherit from a common interface, this could be much easier:

public interface IAccount
{
    int Id { get; set; }
    bool IsActive { get; set; }
}

Your method signature would look more like this then:

public static Differences<IAccount> CheckChanges(List<IAccount> sourceTable, List<IAccount> destinationTable)

Answer 2

public static Differences<T> CheckChanges<T>(List<T> sourceTable, 
                                             List<T> destinationTable, 
                                             Func<T, bool> predicate,
                                             Func<T, T, bool> pred2)
{
    var differences = new Differences<Account>();

    foreach (var sourceItem in sourceTable.Where(predicate))
    {
        var destinationItem = destinationTable.FirstOrDefault(x => pred2(x, sourceItem));
    }

    return differences;
}