This is my object structure
class object
{
string projectname;
string projectid;
list<string> associated_students;
}
//The List I am binding to the grid
list<objects> objectList = getList();
dataGridView.Source =objectList;
Now I want to bind the combo box inside the datagrid with the list "associated_students"
If I understand the question, you want each row to be tied to an object within your list of objects and you want the third column to show a combobox of that object's unique list of associated students. If I am correct, a simple search leads to this similar question:
How do I set up a DataGridView ComboBoxColumn with a different DataSource in each cell?
To solve, you need to manually bind each row. I was able to duplicate your problem and came up with this solution:
Your class "object"
public class Assignment
{
public Assignment()
{
this.Associated_Students = new List<string>();
}
public string ProjectName { get; set; }
public string ProjectID { get; set; }
public List<string> Associated_Students { get; set; }
}
And in Form1:
public Form1()
{
InitializeComponent();
this.Assignments = new List<Assignment>()
{
new Assignment()
{
ProjectID = "1",
ProjectName = "First",
Associated_Students = new List<string>() { "Me", "You", "Him", "Her" }
},
new Assignment()
{
ProjectID = "2",
ProjectName = "Second",
Associated_Students = new List<string>() { "Foo", "Bar" }
}
};
this.BindDGViewToList();
}
public List<Assignment> Assignments { get; set; }
public void BindDGViewToList()
{
DataGridViewTextBoxColumn col1 = new DataGridViewTextBoxColumn();
col1.Name = "Project Name";
col1.ValueType = typeof(string);
dataGridView1.Columns.Add(col1);
DataGridViewTextBoxColumn col2 = new DataGridViewTextBoxColumn();
col2.Name = "Project ID";
col2.ValueType = typeof(string);
dataGridView1.Columns.Add(col2);
DataGridViewComboBoxColumn col3 = new DataGridViewComboBoxColumn();
col3.Name = "Associated Students";
col3.ValueType = typeof(string);
dataGridView1.Columns.Add(col3);
for (int i = 0; i < this.Assignments.Count; i++)
{
DataGridViewRow row = (DataGridViewRow)(dataGridView1.Rows[0].Clone());
DataGridViewTextBoxCell textCell = (DataGridViewTextBoxCell)(row.Cells[0]);
textCell.ValueType = typeof(string);
textCell.Value = this.Assignments[i].ProjectName;
textCell = (DataGridViewTextBoxCell)(row.Cells[1]);
textCell.ValueType = typeof(string);
textCell.Value = this.Assignments[i].ProjectID;
DataGridViewComboBoxCell comboCell = (DataGridViewComboBoxCell)(row.Cells[2]);
comboCell.ValueType = typeof(string);
comboCell.DataSource = this.Assignments[i].Associated_Students;
dataGridView1.Rows.Add(row);
}
}
Note: This will display what you are asking for but you will have to handle updating your data. I would suggest researching BindingList over List objects. There may be better solutions, but this worked quickly for me.
