将datagrid.ItemsSource作为通用函数中的通用列表传递

Question

I am tryting to implement paggination on datagrid, which can contain different types of lists eg Teacher, Student etc How can I call the button click event so that my Paginate function can filter that list and set the itemssource of my datagrid

    public List<T> Paginate<T>(List<T> list, int itemsPerPage, int currentPage)
    {
        // some code
    }


    private void Button1_Click(object sender, RoutedEventArgs e)
    {            
        this.Paginate(myDataGrid.ItemsSource,3,1);
    }

Answer 1

If you have no restrictions to the elements and access it only by index and don't use extra filtering by object properties then you can use non-generic types in your code:

public IList Paginate(IList list, int itemsPerPage, int currentPage)
{
    // some code
}

private void Button1_Click(object sender, RoutedEventArgs e)
{            
    this.Paginate(myDataGrid.ItemsSource as IList, 3, 1);
}

But you should do it only if you are ensure that ItemsSource contains an object that implements IList , for example, List<T> . If you are not sure you will need to use IEnumerable interface and iterate collection for each paging.

Answer 2

try this , for this solution you need to atlest provide information which datalist is binded

private void Button1_Click(object sender, RoutedEventArgs e)
{
   if(boundlist=="Employee")
   {
    List<Employee> copy = new List<Employee>
    ((myDataGrid.ItemsSource as IList).OfType<Employee>());
    this.Paginate<Employee>(copy,3,1);
   }
   else if(boundlist=="Student")
   {
    List<Student> copy = new List<Employee>
    ((myDataGrid.ItemsSource as IList).OfType<Student>());
    this.Paginate<Student>(copy,3,1);
   }
}

Answer 3

If Paginate is just for paging then just pass it as a list of objects.

private void Button1_Click(object sender, RoutedEventArgs e)
{            
    this.Paginate(myDataGrid.ItemsSource as IList<object>, 3, 1);
}