Question

我已经创建了一个自定义datagridview列和单元格，用于禁用或隐藏其控件。

public class DataGridViewDisableTextBoxColumn : DataGridViewTextBoxColumn
{
    private bool _textBoxesEnabled = true;
    public bool TextBoxesEnabled
    {
        get
        {
            return _textBoxesEnabled;
        }
        set
        {
            _textBoxesEnabled = value;
            if (this.DataGridView == null) return;
            foreach (DataGridViewRow row in this.DataGridView.Rows)
            {
                var cell = row.Cells[this.Index] as DataGridViewDisableTextBoxCell;
                if (cell == null) continue;
                cell.Enabled = _textBoxesEnabled;
            }
        }
    }

    private bool _TextBoxesVisible = true;
    public bool TextBoxesVisible
    {
        get
        {
            return _TextBoxesVisible;
        }
        set
        {
            _TextBoxesVisible = value;
            if (this.DataGridView == null) return;
            foreach (DataGridViewRow row in this.DataGridView.Rows)
            {
                var cell = row.Cells[this.Index] as DataGridViewDisableTextBoxCell;
                if (cell == null) continue;
                cell.TextBoxVisible = _TextBoxesVisible;
            }
        }
    }

    public DataGridViewDisableTextBoxColumn()
    {
        this.CellTemplate = new DataGridViewDisableTextBoxCell();
    }
}

public class DataGridViewDisableTextBoxCell : DataGridViewTextBoxCell
{
    private bool _textBoxVisibleValue;
    public bool TextBoxVisible
    {
        get
        {
            var colEnabled = true;
            if (this.OwningColumn != null) colEnabled = ((DataGridViewDisableTextBoxColumn)this.OwningColumn).TextBoxesVisible;
            return _textBoxVisibleValue && colEnabled;
        }
        set
        {
            _textBoxVisibleValue = value;
        }
    }

    private bool enabledValue;
    public bool Enabled
    {
        get
        {
            var colVisible = true;
            if (this.OwningColumn != null) colVisible = ((DataGridViewDisableTextBoxColumn)this.OwningColumn).TextBoxesEnabled;
            return enabledValue && colVisible;
        }
        set
        {
            enabledValue = value;
        }
    }

    // Override the Clone method so that the Enabled property is copied.
    public override object Clone()
    {
        DataGridViewDisableTextBoxCell cell =
            (DataGridViewDisableTextBoxCell)base.Clone();
        cell.Enabled = this.Enabled;
        cell.TextBoxVisible = this.TextBoxVisible;
        return cell;
    }

    // By default, enable the cell.
    public DataGridViewDisableTextBoxCell()
    {
        this.enabledValue = true;
        this._textBoxVisibleValue = true;
    }

    protected override void Paint(Graphics graphics,
        Rectangle clipBounds, Rectangle cellBounds, int rowIndex,
        DataGridViewElementStates elementState, object value,
        object formattedValue, string errorText,
        DataGridViewCellStyle cellStyle,
        DataGridViewAdvancedBorderStyle advancedBorderStyle,
        DataGridViewPaintParts paintParts)
    {
        if (!this.Enabled || !this.TextBoxVisible)
        {
            // Draw the cell background, if specified.
            if ((paintParts & DataGridViewPaintParts.Background) == DataGridViewPaintParts.Background)
            {
                SolidBrush cellBackground = new SolidBrush(cellStyle.BackColor);
                graphics.FillRectangle(cellBackground, cellBounds);
                cellBackground.Dispose();
            }

            // Draw the cell borders, if specified.
            if ((paintParts & DataGridViewPaintParts.Border) == DataGridViewPaintParts.Border)
            {
                PaintBorder(graphics, clipBounds, cellBounds, cellStyle,
                    advancedBorderStyle);
            }
            if (this.TextBoxVisible && !this.Enabled)
            {
                // Draw the disabled textbox.                    
                TextBoxRenderer.DrawTextBox(graphics, cellBounds, TextBoxState.Disabled);
            }
        }
        else
        {
            // The button cell is enabled, so let the base class 
            // handle the painting.
            base.Paint(graphics, clipBounds, cellBounds, rowIndex,
                elementState, value, formattedValue, errorText,
                cellStyle, advancedBorderStyle, paintParts);
        }
    }
}

在列上使用TextBoxesEnabled属性时，此方法似乎工作正常。但是，如果我尝试这样做：

private void gridPins_CellEndEdit(object sender, DataGridViewCellEventArgs e)
{
var row = gridPins.Rows[e.RowIndex];
var view = row.DataBoundItem as ECUTemplatePin_View;
var cellFontSize = row.Cells[colFontSize.Index] as DataGridViewDisableTextBoxCell;
cellFontSize.Enabled = view.IncludeInPrint;
}

cellFontSize变量为null。看来（从调试中）colFontSize实际上是我的应用程序运行时的标准datagridview文本框单元格，而不是自定义类型，即使它初始化为自定义类型（在.Designer.cs文件中）

任何建议从哪里开始寻找我的错误都将非常感激：）

编辑：colFontSize定义如下：

private DataGridViewDisableTextBoxColumn colFontSize;
this.colFontSize = new DataGridViewDisableTextBoxColumn();
// 
// colFontSize
// 
this.colFontSize.AutoSizeMode = System.Windows.Forms.DataGridViewAutoSizeColumnMode.AllCells;
this.colFontSize.DataPropertyName = "FontSize";
this.colFontSize.HeaderText = "Skriftstørrelse";
this.colFontSize.Name = "colFontSize";
this.colFontSize.TextBoxesEnabled = true;
this.colFontSize.TextBoxesVisible = true;
this.colFontSize.Width = 95;

Answer 1

我放弃了这种方法并使用了这篇文章的解决方案：

Enabling and disabling a cell in a Datagridview

将自定义datagridview单元格转换为其类型不起作用

1 个答案: