我为datagridview创建了一个自定义列,该自定义列是从DataGridViewColumn,DataGridViewTextBoxCell派生并实现IDataGridViewEditingControl的。

我创建了一个包含简单TextBox的用户控件,并将该控件用作该列的编辑控件。

现在,在这种情况下我遇到了一个奇怪的问题。当我按字符'q'时,DataGridView的自定义列中的单元格不显示它,什么也没有发生,但是当我按任何其他键时,它会正确显示在该单元格中。

这里可能是什么问题?我尝试通过对每个事件进行调试来尝试各种方式,但徒劳地找不到任何东西。

我在下面提供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DataGridView中的列之一,并且DataGridView与任何DataSource不相关。

有人可以指出我在这段代码中的问题吗?

最佳答案

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!
      }
    }

关于c# - DataGridView自定义DataGridViewColumn单元格的奇怪字符“q”问题,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/4783571/

10-17 01:18