c# - DataGridView 自定义 DataGridViewColumn 单元格的奇怪字符 'q' 问题

Question

我为从 DataGridViewColumn、DataGridViewTextBoxCell 派生的 datagridview 创建了一个自定义列，并实现了 IDataGridViewEditingControl。

我创建了一个包含简单文本框的用户控件，我将此控件用作该列的编辑控件。

现在我在这种情况下遇到了一个奇怪的问题。当我按下字符“q”时，DataGridView 自定义列中的单元格不显示它并且什么也没有发生，但是当我按下任何其他键时它会正确显示在单元格中。

这可能是什么问题？我通过为每个事件调试它来尝试各种方法，但徒劳无功，我还找不到任何东西。

我在下面给出了我创建的自定义列的代码。

  public class CustomControlColumn : DataGridViewColumn
  {
    public CustomControlColumn() : base(new CustomTextCell()) { }

    public override DataGridViewCell CellTemplate
    {
      get
      {
        return base.CellTemplate;
      }
      set
      {
        // Ensure that the cell used for the template is a CustomComboCell.
        if (value != null && !value.GetType().IsAssignableFrom(typeof(CustomTextCell)))
        {
          throw new InvalidCastException("Must be a CustomTextCell");
        }

        base.CellTemplate = value;
      }
    }
  }

  public class CustomTextCell : DataGridViewTextBoxCell
  {
    public override void InitializeEditingControl(int rowIndex, object initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle)
    {
      // Set the value of the editing control to the current cell value.
      base.InitializeEditingControl(rowIndex, initialFormattedValue, dataGridViewCellStyle);
      var control = DataGridView.EditingControl as CustomTextBoxControl;

      if (OwningColumn == null)
        return;

      // Use the default row value when Value property is null.
      if (Value == null)
      {
        control.Text = string.Empty;
      }
      else
      {
        control.Text = Value.ToString();
      }
    }

    public override Type EditType
    {
      get
      {
        // Return the type of the editing contol that CustomComboCell uses.
        return typeof(CustomControlEditingControl);
      }
    }

    public override Type ValueType
    {
      get
      {
        // Return the type of the value that CustomTextCell contains.
        return typeof(String);
      }
    }

    public override object DefaultNewRowValue
    {
      get
      {
        // Use the empty string as the default value.
        return string.Empty;
      }
    }
  }

  class CustomControlEditingControl : CustomTextBoxControl, IDataGridViewEditingControl
  {
    public void ApplyCellStyleToEditingControl(DataGridViewCellStyle dataGridViewCellStyle)
    {
      // Nothing to do
    }

    public bool EditingControlWantsInputKey(Keys keyData, bool dataGridViewWantsInputKey)
    {
      // Let the control handle the keys listed.
      switch (keyData & Keys.KeyCode)
      {
        case Keys.Left:
        case Keys.Up:
        case Keys.Down:
        case Keys.Right:
        case Keys.Home:
        case Keys.End:
        case Keys.PageDown:
        case Keys.PageUp:
          return true;
        default:
          return false;
      }
    }

    public object GetEditingControlFormattedValue(DataGridViewDataErrorContexts context)
    {
      return EditingControlFormattedValue;
    }

    public DataGridView EditingControlDataGridView { get; set; }

    public object EditingControlFormattedValue
    {
      get { return Text; }
      set { Text = value.ToString(); }
    }

    public int EditingControlRowIndex { get; set;}

    public bool EditingControlValueChanged { get; set; }

    public Cursor EditingPanelCursor
    {
      get { return base.Cursor; }
    }

    public bool RepositionEditingControlOnValueChange
    {
      get { return false; }
    }
  }

我已通过设计器将其添加为我的 DataGridView 中的列之一，并且 DataGridView 未与任何数据源相关联。

谁能指出我这段代码中的问题？

Answer 1

进行以下更改，看看是否有帮助:

public bool EditingControlWantsInputKey(Keys keyData, bool dataGridViewWantsInputKey)
    {
      // Let the control handle the keys listed.
      switch (keyData & Keys.KeyCode)
      {
        case Keys.Left:
        case Keys.Up:
        case Keys.Down:
        case Keys.Right:
        case Keys.Home:
        case Keys.End:
        case Keys.PageDown:
        case Keys.PageUp:
          return true;
        default:
         // return false; <--not this
         return !dataGridViewWantsInputKey; //try this!
      }
    }