c# - 如何创建 datagridview NumericUpDown 列

Question

我想在 datagridview 中添加一个 NumericUpDown 类型的列。所以我为此创建了自定义列类型并且它工作正常但每次都可以看到此控件。我只想在输入此列(NumericUpdown 列)的特定单元格时只显示此控件。我想要如下截图所示。

任何帮助将不胜感激。

Answer 1

我修改了 Web 示例，包括 MIN/MAX 范围。

public class NumericUpDownColumn : DataGridViewColumn
{
    public NumericUpDownColumn()
        : base(new NumericUpDownCell())
    {
    }

    public override DataGridViewCell CellTemplate
    {
        get { return base.CellTemplate; }
        set
        {
            if (value != null && !value.GetType().IsAssignableFrom(typeof(NumericUpDownCell)))
            {
                throw new InvalidCastException("Must be a NumericUpDownCell");
            }
            base.CellTemplate = value;
        }
    }
}

public class NumericUpDownCell : DataGridViewTextBoxCell
{
    private readonly decimal min;
    private readonly decimal max;

    public NumericUpDownCell()
        : base()
    {
        Style.Format = "F0";
    }
    public NumericUpDownCell(decimal min, decimal max)
        : base()
    {
        this.min = min;
        this.max = max;
        Style.Format = "F0";
    }

    public override void InitializeEditingControl(int rowIndex, object initialFormattedValue, DataGridViewCellStyle dataGridViewCellStyle)
    {
        base.InitializeEditingControl(rowIndex, initialFormattedValue, dataGridViewCellStyle);
        NumericUpDownEditingControl ctl = DataGridView.EditingControl as NumericUpDownEditingControl;
        ctl.Minimum = this.min;
        ctl.Maximum = this.max;
        ctl.Value = Convert.ToDecimal(this.Value);
    }

    public override Type EditType
    {
        get { return typeof(NumericUpDownEditingControl); }
    }

    public override Type ValueType
    {
        get { return typeof(Decimal); }
    }

    public override object DefaultNewRowValue 
    {
        get { return null; } //未編集の新規行に余計な初期値が出ないようにする
    }
}

public class NumericUpDownEditingControl : NumericUpDown, IDataGridViewEditingControl
{
    private DataGridView dataGridViewControl;
    private bool valueIsChanged = false;
    private int rowIndexNum;

    public NumericUpDownEditingControl()
        : base()
    {
        this.DecimalPlaces = 0;
    }

    public DataGridView EditingControlDataGridView
    {
        get { return dataGridViewControl; }
        set { dataGridViewControl = value; }
    }

    public object EditingControlFormattedValue
    {
        get{ return this.Value.ToString("F0"); }
        set{ this.Value = Decimal.Parse(value.ToString()); }
    }
    public int EditingControlRowIndex
    {
        get { return rowIndexNum; }
        set { rowIndexNum = value; }
    }
    public bool EditingControlValueChanged
    {
        get { return valueIsChanged; }
        set { valueIsChanged = value; }
    }

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

    public bool RepositionEditingControlOnValueChange
    {
        get { return false; }
    }

    public void ApplyCellStyleToEditingControl(DataGridViewCellStyle dataGridViewCellStyle)
    {
        this.Font = dataGridViewCellStyle.Font;
        this.ForeColor = dataGridViewCellStyle.ForeColor;
        this.BackColor = dataGridViewCellStyle.BackColor;
    }

    public bool EditingControlWantsInputKey(Keys keyData, bool dataGridViewWantsInputKey)
    {
        return (keyData == Keys.Left || keyData == Keys.Right ||
            keyData == Keys.Up || keyData == Keys.Down ||
            keyData == Keys.Home || keyData == Keys.End ||
            keyData == Keys.PageDown || keyData == Keys.PageUp);
    }

    public object GetEditingControlFormattedValue(DataGridViewDataErrorContexts context)
    {
        return this.Value.ToString();
    }

    public void PrepareEditingControlForEdit(bool selectAll)
    {
    }

    protected override void OnValueChanged(EventArgs e)
    {
        valueIsChanged = true;
        this.EditingControlDataGridView.NotifyCurrentCellDirty(true);
        base.OnValueChanged(e);
    }
}