如何让我的自己的DataGridView列

Question

我试图做的是使

• 显示在每个单元的 下拉列表不同的项目的DataGridViewDropdownColumn。
• DataGridViewHybridColumn 显示每个单元格的TextBox或ComboBox。

我读了this toturial并创建了我自己的DataGridViewBarColumn，但我没有丝毫的线索我应该如何实现这样的东西。

即使在DataGridView中可能有超过100K行，性能并不重要，我稍后会考虑优化。

我觉得他们就完成了同样的方式，所以我问他们一个问题

Answer 1

我可以给你一个起点上实现它：

首先，准备好你的约束力，创建你的DataGridViewComboBoxColumn。

private List<string> list = new List<string>(); 

public Form1() 
{ 
     InitializeComponent(); 

     // Data source for you dropdown list 
     list.Add("First Option"); 
     list.Add("Second Option"); 
     list.Add("Third Option"); 

     dataGridView1.AutoGenerateColumns = false; 
     dataGridView1.MultiSelect = false; 
     dataGridView1.EditMode = DataGridViewEditMode.EditOnEnter; 
     dataGridView1.AutoSizeColumnsMode = System.Windows.Forms.DataGridViewAutoSizeColumnsMode.Fill; 
     dataGridView1.CellValidating += new DataGridViewCellValidatingEventHandler(dataGridView1_CellValidating); 
     dataGridView1.EditingControlShowing += new DataGridViewEditingControlShowingEventHandler(dataGridView1_EditingControlShowing); 
     dataGridView1.DataError += dataGridView1_DataError; 

     // Formatting your ComboBox 
     DataGridViewComboBoxColumn comboColumn = new DataGridViewComboBoxColumn(); 
     comboColumn.FlatStyle = FlatStyle.Flat; 
     comboColumn.HeaderText = "Hybrid Data Grid Column"; 
     comboColumn.DataPropertyName = "Tag"; 
     //comboColumn.DataSource = list;   

     dataGridView1.Columns.Add(comboColumn); 
     dataGridView1.DataSource = list; 

} 

其次，附加的事件进行编辑，一旦你键入：

private void dataGridView1_CellValidating(object sender, DataGridViewCellValidatingEventArgs e) 
    { 
     var combo = ((DataGridView)sender).CurrentCell as DataGridViewComboBoxCell; 
     if (combo == null) 
     { 
      return; 
     } 
     if (!combo.Items.Contains(e.FormattedValue)) 
     { 
      // Add the text you type into you bound list and refresh binding 
      list.Add(e.FormattedValue.ToString()); 
      DataGridViewComboBoxColumn col = ((DataGridView)sender).CurrentCell.OwningColumn as DataGridViewComboBoxColumn; 
      col.Items.Clear(); 
      col.Items.AddRange(list); 
     } 

     // Display what you type 
     ((DataGridView)sender).CurrentCell.Value = e.FormattedValue; 
    } 

    private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e) 
    { 
     ComboBox comboControl = e.Control as ComboBox; 
     if (comboControl != null) 
     { 
      if (comboControl.DropDownStyle != ComboBoxStyle.DropDown) 
      { 
       comboControl.DropDownStyle = ComboBoxStyle.DropDown; 
      } 
      //Update Items if list has changed (assumes items can't be deleted) 
      if (comboControl.Items.Count != list.Count) 
      { 
       DataGridViewComboBoxColumn col = ((DataGridView)sender).CurrentCell.OwningColumn as DataGridViewComboBoxColumn; 
       col.Items.Clear(); 
       col.Items.AddRange(list.ToArray()); 
       //Note: current cell's items don't appear to be refreshed by the lines above 
       comboControl.Items.Clear(); 
       comboControl.Items.AddRange(list.ToArray()); 
      } 
     } 
    } 

样本输出：

注：由于我们是在我们的绑定添加文本输入列出它可能会发生，一旦你点击下拉选项，你会看到额外的输入。所以，我会把它交给你来打磨它。