How to enable DataGridView sorting when user clicks on the column header?

Question

I have a datagridview on my form and I populate it with this:

dataGridView1.DataSource = students.Select(s => new { ID = s.StudentId, RUDE = s.RUDE, Nombr         


        

Answer 1

1. Create a class which contains all properties you need, and populate them in the constructor

   class Student
   {
       int _StudentId;
       public int StudentId {get;}
       string _Name;
       public string Name {get;}
       ...
   
       public Student(int studentId, string name ...)
       { _StudentId = studentId; _Name = name; ... }
   }
   

2. Create an IComparer < Student > class, to be able to sort

   class StudentSorter : IComparer
   {
       public enum SField {StudentId, Name ... }
       SField _sField; SortOrder _sortOrder;
   
       public StudentSorder(SField field, SortOrder order)
       { _sField = field; _sortOrder = order;}
   
       public int Compare(Student x, Student y)
       {
           if (_SortOrder == SortOrder.Descending)
           {
               Student tmp = x;
               x = y;
               y = tmp;
           }
   
           if (x == null || y == null)
               return 0;
   
           int result = 0;
           switch (_sField)
           {
               case SField.StudentId:
                   result = x.StudentId.CompareTo(y.StudentId);
                   break;
               case SField.Name:
                   result = x.Name.CompareTo(y.Name);
                   break;
                   ...
           }
   
           return result;
       }
   }
   

3. Within the form containing the datagrid add

   ListDictionary sortOrderLD = new ListDictionary(); //if less than 10 columns
   private SortOrder SetOrderDirection(string column)
   {
       if (sortOrderLD.Contains(column))
       {
           sortOrderLD[column] = (SortOrder)sortOrderLD[column] == SortOrder.Ascending ? SortOrder.Descending : SortOrder.Ascending;
       }
       else
       {
           sortOrderLD.Add(column, SortOrder.Ascending);
       }
   
       return (SortOrder)sortOrderLD[column];
   }
   

4. Within datagridview_ColumnHeaderMouseClick event handler do something like this

   private void dgv_ColumnHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e)
   {
       StudentSorter sorter = null;
       string column = dGV.Columns[e.ColumnIndex].DataPropertyName; //Use column name if you set it
       if (column == "StudentId")
       {
           sorter = new StudentSorter(StudentSorter.SField.StudentId, SetOrderDirection(column));
       }
       else if (column == "Name")
       {
           sorter = new StudentSorter(StudentSorter.SField.Name, SetOrderDirection(column));
       }
   
       ...
   
       List lstFD = datagridview.DataSource as List;
       lstFD.Sort(sorter);
       datagridview.DataSource = lstFD;
       datagridview.Refresh();
   }
   

Hope this helps