write a function using generic
- by user296551
hi,guy, i want write a function using c#, and it accept any type parameter,i want use generic list to do, but i can't finish, it's wrong, how to do it? perhaps there are other ways??
thinks!
public class City
{
public int Id;
public int? ParentId;
public string CityName;
}
public class ProductCategory
{
public int Id;
public int? ParentId;
public string Category;
public int Price;
}
public class Test
{
public void ReSortList<T>(IEnumerable<T> sources, ref IEnumerable<T> returns, int parentId)
{
//how to do like this:
/*
var parents = from source in sources where source.ParentId == parentId && source.ParentId.HasValue select source;
foreach (T child in parents)
{
returns.Add(child);
ReSortList(sources, ref returns, child.Id);
}
*/
}
public void Test()
{
IList<City> city = new List<City>();
city.Add(new City() { Id = 1, ParentId = 0, CityName = "China" });
city.Add(new City() { Id = 2, ParentId = null, CityName = "America" });
city.Add(new City() { Id = 3, ParentId = 1, CityName = "Guangdong" });
IList<City> results = new List<City>();
ReSortList<City>(city, ref results, 0); //error
}
}
