单击后如何使 DataGridViewCell 中的 ComboBox 下拉？

Question

我有一个 DataGridView，它的第一列样式设置为 ComboBox 而不是默认的 TextBox。由于 DataGridView 中的行数在启动时不固定，因此在添加新行时我无法将数据加载到每行的 ComboBoxes 中。所以我尝试加载用户向 DataGridView 添加行的事件：

public void myDataGridView_UserAddedRow(object sender, DataGridViewRowEventArgs e)
{
    // Identifiers used are:
    var myTableAdapter = new databaseTableAdapters.myTableTableAdapter();
    var myDataTable = myTableAdapter.GetData();
    int rowIndex = myDataGridView.CurrentcellAddress.Y;
    var comboBoxCell = (DataGridViewComboBoxCell)myDataGridView.Rows[rowIndex].Cells[0];
    string itemToAdd;

    // Load in the data from the data table
    foreach (System.Data.DataRow row in myDataTable.Rows) 
    {
        // Get the current item to be added
        itemToAdd = row[0].ToString();
        // Make sure there are no duplicates
        if (!comboBoxCell.Items.Contains(itemToAdd)) 
        {
            comboBoxCell.Items.Add(itemToAdd)
        }
    }
}

但这只会让用户在点击秒之后看到下拉选项。我希望能够让用户只单击一次组合框并查看选项，而不是不太直观的双击。如何做到这一点？

Answer 1

单元格必须获得焦点才能出现下拉菜单，因此双击实际上是单击一次以获得对该单元格的焦点和第二次点击是导致下拉发生的原因。所以在this link之后看看如何改变焦点。我能够用一行代码修改代码

public void myDataGridView_UserAddedRow(object sender, DataGridViewRowEventArgs e)
{
    // Identifiers used are:
    var myTableAdapter = new databaseTableAdapters.myTableTableAdapter();
    var myDataTable = myTableAdapter.GetData();
    int rowIndex = myDataGridView.CurrentcellAddress.Y;
    var comboBoxCell = (DataGridViewComboBoxCell)myDataGridView.Rows[rowIndex].Cells[0];
    string itemToAdd;

    // Load in the data from the data table
    foreach (System.Data.DataRow row in myDataTable.Rows) 
    {
        // Get the current item to be added
        itemToAdd = row[0].ToString();
        // Make sure there are no duplicates
        if (!comboBoxCell.Items.Contains(itemToAdd)) 
        {
            comboBoxCell.Items.Add(itemToAdd)
        }
    }
    // Send the focus to the next combo box (removes need for a double click)
    myDataGridView.CurrentCell = myDataGridView.Rows[rowIndex + 1].Cells[0]; // <--- HERE
}

单击后如何使 DataGridViewCell 中的 ComboBox 下拉？

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