Add entry into databound DataGridView

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C#

DataGridView

forms

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Hi folks,

user shall be able to edit a list of these cute little demo objects:

C#

class Foo
{
    public int FirstCol { get; set; }
    public int SecondCol { get; set; }
    public Foo(int first, int second)
    {
        FirstCol = first;
        SecondCol = second;
    }
}


public void WindowsFormsMethod()
{
    BindingList<Foo> list = new BindingList<Foo>();
    list.Add(new Foo(1, 2));
    list.Add(new Foo(2, 3));
    list.Add(new Foo(42, 32));

    dgvEditor.DataSource = bla;
    // dgvEditor.AllowUserToAddRows is already true
}

And by "edit", I mean he can change values, which works, _and_ add new rows, which doesn't. How can I enable user to add rows?

Posted 1-Dec-14 22:22pm

lukeer

Updated 2-Dec-14 19:45pm

v2

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Member 10889447 2-Dec-14 21:45pm

Hope this link can help you.
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.datagrid.itemdatabound%28v=vs.110%29.aspx

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Anisuzzaman Sumon · Answer 1 · 2014-12-13T18:05:00

As a result of googling a lot I've come to a decision that actually there is no way to add new row to a datagridview which has a binding source.However I am not sure at all.But According to your need I am giving you a solution I think it works for you fine.Please check it.Thanks

C#

public Form1()
  {
      InitializeComponent();
      BindingList<foo> list = new BindingList<foo>();
      list.Add(new Foo(1, 2));
      list.Add(new Foo(2, 3));
      list.Add(new Foo(42, 32));
      list.Add(new Foo(0, 0));
      dgvEditor.Columns.Add("FirstCol", "First Column");
      dgvEditor.Columns.Add("SecondCol", "Second Column");
      int count=0;
      foreach (Foo f in list)
      {
          dgvEditor.Rows.Add();
          dgvEditor[0, count].Value = f.FirstCol;
          dgvEditor[1, count].Value = f.FirstCol;
          count++;

      }
 }

lukeer · Answer 2 · 2014-12-14T19:52:00

The solution is to add a parameterless Foo constructor.

C#

class Foo
{
    public int FirstCol { get; set; }
    public int SecondCol { get; set; }

    // This c'tor is needed for the user
    //   to add entries from within
    //   a databound DataGridView.
    public Foo()
    { }

    public Foo(int first, int second)
    {
        FirstCol = first;
        SecondCol = second;
    }
}


public void WindowsFormsMethod()
{
    BindingList<Foo> list = new BindingList<Foo>();
    list.Add(new Foo(1, 2));
    list.Add(new Foo(2, 3));
    list.Add(new Foo(42, 32));

    dgvEditor.DataSource = list;
    // dgvEditor.AllowUserToAddRows is already true
}

Which I tried to avoid because the parameterized c'tor did some checking of the values it got as parameters. Will have to perform those in another way.

Add entry into databound DataGridView

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