如何在不删除数据 C# 的情况下将新数据添加到数据网格视图？

Question

hello guys need to put data on data grid view without delete this my code but this code give me only last item in list box

for (int i = 0; i < listBox1.Items.Count; i++)
        
 {
    textBox1.Text = listBox1.Items[i].ToString();               
            
    dataGridView1.DataSource = cls_all.Get_Test3(Convert.ToSingle(textBox1.Text));
 }

tried this code

 dataGridView1.Rows.Add(cls_all.Get_Test3(Convert.ToSingle(textBox1.Text)));

and get this msg System.InvalidOperationException: 'Rows cannot be programmatically added to the DataGridView's rows collection when the control is data-bound.'

need way to put data without delete data grid view any help with it

Answer 1

Use a DataTable instead of directly trying to add rows to a grid.

DataTable dt = new DataTable();
DataColumn dc = new DataColumn("MyColumn", typeof(String));
dt.Columns.Add(dc);
for (int i = 0; i < listBox1.Items.Count; i++)
{
   textBox1.Text = listBox1.Items[i].ToString(); // I do not know why you need this 
   dt.Rows.Add(new Object[] { listBox1.Items[i].ToString()});
}
dataGridView1.ItemsSource = dt.DefaultView;