WinForms在datagridview中显示datagridview对象

Question

I have several datagridview objects saved in a global dictionary. I want to find a specific datagridview object and display it in a datagridview. Everything seems to work exept for the actual display. Here is the code that is suppost to display

if (seznamPodatkov.ContainsKey(tn.Text))
            {
                dataGridView1.DataSource = seznamPodatkov[tn.Text];

            }

Maybe I'm supposed to use the databind, but I don't know how to use it with many datagrid object, from which I get the right one.

Edit: This code below saves datagridview objects, which should be later restored and displayed. The datagridview changes depending on a treeview, if a node with childs is clicked, then first is checked if a gridview from this parent node already exists. If it does, it should display that datagrid from dictionary, if not, it makes a new one and saves it to dictionary.

private Dictionary<string, DataGridView> seznamPodatkov;  

  if (tree1.SelectedNode == null) return;
            if(tree1.SelectedNode.GetNodeCount(false) > 0)
            {
                if (seznamPodatkov.ContainsKey(tree1.SelectedNode.Text))                              
                {
                    seznamPodatkov[tree1.SelectedNode.Text] = dataGridView1;
                }
                else seznamPodatkov.Add(tree1.SelectedNode.Text, dataGridView1);
            }

private void tree1_AfterSelect(object sender, TreeViewEventArgs e)                  
        {
            TreeNode tn = tree1.SelectedNode;
            if (tn == null) return;
            if (tn.GetNodeCount(false) > 0)
            {
                dataGridView1.Columns.Clear();

                if (seznamPodatkov.ContainsKey(tn.Text))
                {
                    dataGridView1.DataSource = seznamPodatkov[tn.Text];

                }
                else
                {
                    dataFill(tn);


                }
                dataGridView1.Show();

            }
            else dataGridView1.Hide();
        }     

Edit:

I made some slight progress. I tried it like this:

      DataGridView dgv = new DataGridView();
        dgv.Columns.Add("something", "something");
        dgv.Columns.Add("something", "something");
        dgv.Columns.Add("something", "something");

        dataGridView1 = dgv;

datagridView1 seems to get the dvg columns, as I checked it with debugger. I have no idea if this is even correct or not, because the dataGridView1 still doesn't display the table in forms.

Answer 1

I handle things differently when I have such a need. I use a custom TabControl that supports hiding the tabs, and couple that with a TreeView whose selection event controls which tab page is displayed.

This provides the illusion of one view that switches with the tree selection, while in reality you would have multiple, separate controls on the form. This would allow you to do away with the Dictionary and simply bind each DataGridView directly to its data source.

Answer 2

I figured it out. First I thought that it's that simple: dgv = dgv1 but it's not.

Here is a test code that worked perferctly:

 Dictionary<string, DataGridView> dic;
    public Form1()
    {
        InitializeComponent();

        dataGridView2.Columns.Add("nekaj", "nekaj");
        dataGridView2.Columns.Add("nekaj", "nekaj");
        dataGridView2.Columns.Add("nekaj", "nekaj");
        dataGridView2.Rows.Add("1", "2", "3");
        dataGridView2.Rows.Add("1", "2", "3");
        dataGridView2.Rows.Add("1", "2", "3");
        dic = new Dictionary<string, DataGridView>();
        dic.Add("test", dataGridView2);

    }


    private void button1_Click(object sender, EventArgs e)
    {

        foreach(DataGridViewColumn columns in dic["test"].Columns)
        {
            dataGridView1.Columns.Add(columns.Name, columns.HeaderText);
        }

        foreach(DataGridViewRow rows in dic["test"].Rows)
        {
            ArrayList list = new ArrayList();


          foreach(DataGridViewCell cell in rows.Cells)
            {
                list.Add(cell.Value);
            }

            dataGridView1.Rows.Add(list.ToArray());

        }