C# 使用列表填充 DataGrid <list<string> &gt;? </list<string>

Question

Let's say I have a DataGrid in WinForms (C#).

I want to populate it but my data is in this format:

List<List<string>> datas;

For simple test I add values:

List<List<string>> ds = new List<List<string>>();
List<string> row1 = new List<string>();
row1.Add("col1");
row1.Add("col2");
row1.Add("col3");
ds.Add(row1);

When I add ds as datasouce for the grid it displays something I don't understand:

grid.DataSource = ds;

I tried also with LINQ, but did not succeed, datagrid is empty. How can I solve this?

I'd do it with or without LINQ if that is faster than manually iterating and populating with for loops.

Answer 1

I modified the code found here to suit your needs;

private void Form1_Load(object sender, EventArgs e)
{

  List<List<string>> list = new List<List<string>>();
  list.Add(new List<string>()
  {
    "Row 1, Col 1",
    "Row 1, Col 2",
    "Row 1, Col 3",
  });
  list.Add(new List<string>()
  {
    "Row 2, Col 1",
    "Row 2, Col 2",
    "Row 2, Col 3",
  });
  list.Add(new List<string>()
  {
    "Row 3, Col 1",
    "Row 3, Col 2",
    "Row 3, Col 3",
  });

  DataTable table = ConvertListToDataTable(list);
  dataGridView1.DataSource = table;
}

static DataTable ConvertListToDataTable(List<List<string>> list)
{

  DataTable table = new DataTable();

  int columns = 0;
  foreach (var item in list)
  {
    if (item.Count > columns)
    {
      columns = item.Count;
    }
  }

  for (int i = 0; i < columns; i++)
  {
    table.Columns.Add();
  }

  foreach (var item in list)
  {
    DataRow new_row = table.NewRow();
    foreach(var col in item)
    {
      new_row[item.IndexOf(col)] = col;
    }
    table.Rows.Add(new_row);
  }

  return table;
}

Which returns the datagrid as per below