CODEWITHSUNDEEP
c#winformsdatagridviewcombobox
krajol
krajol

Reputation: 848

Setting DataSource to DataGridViewComboBoxColumn

I'm trying to set DataSource to DataGridViewComboBoxColumn of my DataGridView. First I'm trying to bind a data source to my DataGridView, where bindingList is a List of my custom class Plugin with properties Name (string), Id (string) and Dependencies (List):

var bindingList = PluginsHandler.GetPlugins();
var source = new BindingSource(bindingList, null);


pluginsDataGridView.AutoGenerateColumns = false;
pluginsDataGridView.DataSource = source;

pluginsDataGridView.Columns["pluginName"].DataPropertyName = "Name";
pluginsDataGridView.Columns["pluginID"].DataPropertyName = "Id";

So I can set my first two columns, but now I want to bind data to a third column of type DataGridViewComboBoxColumn. I try to do it on DataBindingComplete event:

private void pluginsDataGridView_DataBindingComplete(object sender, DataGridViewBindingCompleteEventArgs e)
{
    for (int i = 0; i < pluginsDataGridView.Rows.Count; i++)
    {
        var comboCell = (DataGridViewComboBoxCell) pluginsDataGridView.Rows[i].Cells["pluginDependencies"];
        var entry = pluginsDataGridView.Rows[i].DataBoundItem as IPlugin;
        comboCell.DataSource = entry.Dependencies;    
    }

}

Sadly comboBox is empty. Funny thing happens when I incorrectly put these lines after the first block of code I posted:

  var dependenciesColumn = (DataGridViewComboBoxColumn) pluginsDataGridView.Columns["pluginDependencies"];
  dependenciesColumn.DataPropertyName = "Dependencies";

Then binding seem to start to work, as I can see that there are some entries in comboboxes, but when I try to hover mouse on combobox, I am getting an error that says DataGridViewComboBoxCell value is not valid).

How can I make it work?

Upvotes: 0

Views: 2409

Answers (1)

Junaith
Junaith

Reputation: 3388

Instead of assigning each ComboCell a data Source, set the DataSource of the column. I assume the Dependencies property of PlugIn class is a List<string>.

pluginsDataGridView.Columns["pluginDependencies"].DataSource = //list of dependencies

You have to set the DataPropertyName of the Dependencies ComboBoxColumn to get the initial values. If you don't set it you won't see any value in the column when the application is loaded.

pluginsDataGridView.Columns["pluginDependencies"].DataPropertyName = "Dependencies"

Edit:

You have a list of dependencies for a plug-in. i.e, more than one value. Usually, to select one value from list of values, you associate list with ComboBoxColumn. Achieving your requirement of multiple values from a list using standard ComboBoxColumn is difficult. Write a custom CheckedComboBoxColumn where you can display and select multiple values.

Upvotes: 0

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