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 程式師世界 >> 編程語言 >> .NET網頁編程 >> C# >> C#入門知識 >> [Winform] DataGridView(FAQ),winformdatagridview

[Winform] DataGridView(FAQ),winformdatagridview

編輯:C#入門知識

[Winform] DataGridView(FAQ),winformdatagridview


Q1.  如何使單元格不可編輯?

A:設置ReadOnly屬性,可以設置的對象包括DataGridViewRow(行)、DataGridViewColumn(列)、DataGridViewCell(單元格)以及自身DataGridView對象均可設置ReadOnly屬性來限制單元格的編輯狀態。

擴展:需要注意的是,當DataGridView通過DataSource綁定數據自動生成行列時,如果直接在Form的構造函數初始化界面InitializeComponent後直接設置ReadOnly屬性,會造成一些意想不到的效果……

  1 public MainForm()
  2 {
  3     InitializeComponent()
  4 
  5     Application.DoEvents()
  6     dataGridView.DataSource = Person.GetPersons()
  7     dataGridView[0, 0].ReadOnly = true
  8     dataGridView.Rows[2].ReadOnly = true
  9     dataGridView.Columns[1].ReadOnly = true
 10 } 

此時對DataGridViewCell、DataGridViewRow的ReadOnly設置無效,而對DataGridViewColumn的ReadOnly設置有效。

另外,ReadOnly屬性只是限制用戶在界面上對單元格內容編輯的限制,並不影響在編程代碼中對該單元格的編輯以及刪除行列操作。

當然,你也可以在CellBeginEdit事件中對單元格進行判斷,然後直接結束編輯即可,如下:

  1 dataGridView.CellBeginEdit += (sender, e) =>
  2 {
  3     if (e.RowIndex == 0 && e.ColumnIndex == 0)
  4     {
  5         e.Cancel = true
  6         // 或者
  7         // dataGridView.EndEdit();
  8     }
  9 }

Q2.  如何禁用單元格(Disable)?

A:DataGridView不支持設置單元格的不可用狀態,所以采用折中辦法,使該“禁用”單元格的選中狀態和其背景顏色相同,給人暗示性的外觀提示該單元格“禁用”。

有一種便捷的方式,就是將該“禁用”單元格的選中顏色設置成非選中顏色,即如果未選中前是白底黑字,則將該“禁用”單元格的選中狀態也改成白底黑字即可,對單元格、行和列均適用,舉例如下:

  1 dataGridView[2, 2].Style.SelectionBackColor = Color.White
  2 dataGridView[2, 2].Style.SelectionForeColor = Color.Black
  3 
  4 dataGridView.Rows[1].DefaultCellStyle.SelectionBackColor = Color.White
  5 dataGridView.Rows[1].DefaultCellStyle.SelectionForeColor = Color.Black
  6 
  7 dataGridView.Columns[0].DefaultCellStyle.SelectionBackColor = Color.White
  8 dataGridView.Columns[0].DefaultCellStyle.SelectionForeColor = Color.Black

需要注意的是,同Q1中一樣,在InitializeComponent方法後面直接操作,其中對單元格的設置無效,對行、列的設置有效!!

但是這種方法對文本內容的單元有效,對於DataGridViewButtonColumn、DataGridViewCheckBoxColumn、DataGridViewComboBoxColumn等其他特殊列就沒效果了,畢竟對於特殊列,禁用單元格就是要禁用其中的特殊控件,這時候就需要重寫其中的單元格模版了,以DataGridViewButtonColumn為例,代碼如下:

public class DataGridViewButtonColumnExt : DataGridViewButtonColum
{
    public DataGridViewButtonColumnExt()
    {
        this.CellTemplate = new DataGridViewButtonCellExt()
    }
}

public class DataGridViewButtonCellExt : DataGridViewButtonCell
{
    private bool _Enabled;// 設置該單元格是否可用

    /// <summary>
    /// 單元格是否可用
    /// </summary>
    public bool Enabled
    {
        get
        {
            return _Enabled
        }
        set
        {
            _Enabled = value
        }
    }

    public override object Clone()
    {
        DataGridViewButtonCellExt cell =(DataGridViewButtonCellExt)base.Clone()
        cell.Enabled = this.Enabled

        return cell
    }

    public DataGridViewButtonCellExt()
    {
        this._Enabled = 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)
        {
            // 繪制背景
            if ((paintParts & DataGridViewPaintParts.Background) == DataGridViewPaintParts.Background)
            {
                SolidBrush cellBackground = new SolidBrush(cellStyle.BackColor)
                graphics.FillRectangle(cellBackground, cellBounds)
                cellBackground.Dispose()
            }

            // 繪制邊框
            if ((paintParts & DataGridViewPaintParts.Border) == DataGridViewPaintParts.Border)
            {
                PaintBorder(graphics, clipBounds, cellBounds, cellStyle, advancedBorderStyle)
            }

            Rectangle buttonArea = cellBound
            Rectangle buttonAdjustment = this.BorderWidths(advancedBorderStyle)
            buttonArea.X += buttonAdjustment.X
            buttonArea.Y += buttonAdjustment.Y
            buttonArea.Height -= buttonAdjustment.Height
            buttonArea.Width -= buttonAdjustment.Width
            
            // 繪制按鈕控件
            ButtonRenderer.DrawButton(graphics, buttonArea, PushButtonState.Disabled)
            // 繪制文本內容
            if (this.FormattedValue is String)
            {
                TextRenderer.DrawText(graphics, (string)this.FormattedValue,
                    this.DataGridView.Font, buttonArea, SystemColors.GrayText)
            }
        }
        else
        {
            base.Paint(graphics, clipBounds, cellBounds, rowIndex, elementState, value, formattedValue,
                errorText, cellStyle, advancedBorderStyle, paintParts)
        }
    }
}

View Code

下面是CheckBox列的重寫例子,因為復選框有兩種禁用效果,一種選中時禁用,一種是未選中時禁用,所以加了一個IsChecked屬性:

public class DataGridViewCheckBoxColumnExt : DataGridViewCheckBoxColum
{
	public DataGridViewCheckBoxColumnExt()
	{
		this.CellTemplate = new DataGridViewCheckBoxCellExt()
	}
}

public class DataGridViewCheckBoxCellExt : DataGridViewCheckBoxCell
{
	private bool _Enable
	private bool _IsChecked
	
	/// <summary>
	/// 是否選中
	/// </summary>
	public bool IsChecked
	{
		get
		{
			return _IsChecked
		}
		set
		{
			_IsChecked = value
		}
	}

	/// <summary>
	/// 是否可用
	/// </summary>
	public bool Enable
	{
		get
		{
			return _Enable
		}
		set
		{
			_Enable = value
		}
	}

	public DataGridViewCheckBoxCellExt()
	{
		_Enable = true
		_IsChecked = false
	}

	public override object Clone()
	{
		DataGridViewCheckBoxCellExt dgvcce = (DataGridViewCheckBoxCellExt)base.Clone()
		dgvcce.Enable = this.Enable
		dgvcce.IsChecked = this.IsChecked

		return dgvcce
	}

	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 (!_Enable)
		{
			// 繪制背景
			if ((paintParts & DataGridViewPaintParts.Background) == DataGridViewPaintParts.Background)
			{
				SolidBrush cellBackground = new SolidBrush(cellStyle.BackColor)
				graphics.FillRectangle(cellBackground, cellBounds)
				cellBackground.Dispose()
			}

			// 繪制邊框
			if ((paintParts & DataGridViewPaintParts.Border) == DataGridViewPaintParts.Border)
			{
				PaintBorder(graphics, clipBounds, cellBounds, cellStyle, advancedBorderStyle)
			}

			Point pos = cellBounds.Locatio
			// 調整位置居中
			pos.X = pos.X + cellBounds.Width / 2 - 7
			pos.Y = pos.Y + cellBounds.Height / 2 - 7
			// 繪制按鈕控件
			CheckBoxRenderer.DrawCheckBox(graphics, pos,
				IsChecked ? CheckBoxState.CheckedDisabled : CheckBoxState.UncheckedDisabled)
		}
		else
		{
			base.Paint(graphics, clipBounds, cellBounds, rowIndex, elementState, value,
				formattedValue, errorText, cellStyle, advancedBorderStyle, paintParts)
		}
	}
}
View Code

Q3.  如何在單元格內同時顯示圖片和文字?

A:參考網上查到的資料,將文本列(DataGridViewTextBoxColum)中的文本向右偏移,然後在前面置入圖片;

public class TextAndImageColumn : DataGridViewTextBoxColum
{
    private Image m_ImageValue
    private Size m_ImageSize

    public TextAndImageColumn()
    {
        this.CellTemplate = new TextAndImageCell()
    }

    public override object Clone()
    {
        TextAndImageColumn c = base.Clone() as TextAndImageColum
        c.m_ImageValue = this.m_ImageValue
        c.m_ImageSize = this.m_ImageSize

        return c
    }

    public Image Image
    {
        get
        {
            return this.m_ImageValue
        }
        set
        {
            if (this.Image != value)
            {
                this.m_ImageValue = value
                this.m_ImageSize = value.Size
                if (this.InheritedStyle != null)
                {
                    Padding inheritedPadding = this.InheritedStyle.Padding
                    this.DefaultCellStyle.Padding = new Padding(m_ImageSize.Width,
                        inheritedPadding.Top, inheritedPadding.Right,
                        inheritedPadding.Bottom)
                }
            }
        }
    }

    public Size ImageSize
    {
        get
        {
            return m_ImageSize
        }
        set
        {
            m_ImageSize = value
        }
    }

    private TextAndImageCell TextAndImageCellTemplate
    {
        get
        {
            return this.CellTemplate as TextAndImageCell
        }
    }
}

public class TextAndImageCell : DataGridViewTextBoxCell
{
    private Image m_ImageValue
    private Size m_ImageSize

    public override object Clone()
    {
        TextAndImageCell c = base.Clone() as TextAndImageCell
        c.m_ImageValue = this.m_ImageValue
        c.m_ImageSize = this.m_ImageSize

        return c
    }

    public Image Image
    {
        get
        {
            if (this.OwningColumn == null || this.OwningTextAndImageColumn == null)
            {
                return m_ImageValue
            }
            else if (this.m_ImageValue != null)
            {
                return this.m_ImageValue
            }
            else
            {
                return this.OwningTextAndImageColumn.Image
            }
        }
        set
        {
            if (this.m_ImageValue != value)
            {
                this.m_ImageValue = value
                this.m_ImageSize = value.Size
                Padding inheritedPadding = this.InheritedStyle.Padding
                this.Style.Padding = new Padding(m_ImageSize.Width,
                    inheritedPadding.Top, inheritedPadding.Right,
                    inheritedPadding.Bottom)
            }
        }
    }

    protected override void Paint(Graphics graphics, Rectangle clipBounds,
        Rectangle cellBounds, int rowIndex, DataGridViewElementStates cellState,
        object value, object formattedValue, string errorText,
        DataGridViewCellStyle cellStyle,
        DataGridViewAdvancedBorderStyle advancedBorderStyle,
        DataGridViewPaintParts paintParts)
    {
        // Paint the base content
        base.Paint(graphics, clipBounds, cellBounds, rowIndex, cellState,
          value, formattedValue, errorText, cellStyle,
          advancedBorderStyle, paintParts)

        if (this.Image != null)
        {
            // Draw the image clipped to the cell.
            System.Drawing.Drawing2D.GraphicsContainer container = graphics.BeginContainer()
            graphics.SetClip(cellBounds)
            graphics.DrawImageUnscaled(this.Image, cellBounds.Location)
            graphics.EndContainer(container)
        }
    }

    private TextAndImageColumn OwningTextAndImageColum
    {
        get
        {
            return this.OwningColumn as TextAndImageColum
        }
    }
}
View Code

還有一種實現方式是在CellPainting事件中對指定單元格進行圖文繪制,參考百度文庫 

Q4.  如何讓DataGridViewComboBox可編輯?

A:見 DataGridView中DataGridViewComboBox的可編輯 。

還有一種根據參考資料1提供的方法,更簡捷,就是在CellValidating事件中將新編輯的內容添加到Items集合中,在EditingControlShowing事件中將下拉框類型DropDownStyle設置成ComboBoxStyle.DropDown,使用戶可以進入編輯狀態,代碼如下:

  1 private void dgv4_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
  2 {
  3     try
  4     {
  5         if (dgv4.CurrentCellAddress.X == 4)
  6         {
  7             ComboBox cb = e.Control as ComboBox;
  8             if (cb != null)
  9             {
 10                 cb.DropDownStyle = ComboBoxStyle.DropDown;
 11             }
 12         }
 13     }
 14     catch (Exception ex)
 15     {
 16         MessageBox.Show(ex.Message);
 17     }
 18 }
 19 
 20 private void dgv4_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
 21 {
 22     try
 23     {
 24         if (e.ColumnIndex == 4)
 25         {
 26             DataGridViewComboBoxColumn dgvcbc = (DataGridViewComboBoxColumn)dgv4.Columns[4];
 27             if (!dgvcbc.Items.Contains(e.FormattedValue))
 28             {
 29                 dgvcbc.Items.Add(e.FormattedValue);
 30             }
 31         }
 32     }
 33     catch (Exception ex)
 34     {
 35         MessageBox.Show(ex.Message);
 36     }
 37 }

Q5.  如何多列排序?

A:分綁定數據和非綁定數據兩種情況處理。

1、綁定數據

如果綁定的數據源(如DataView)支持多列排序,則DataGridView在綁定數據後會保留數據源排序後的結果,但是只有第一個進行排序的列會在DataGridView的顯示排序標記。而且,DataGridView的SortedColumn屬性也只返回第一個排序列。

如果數據源實現了IBindingListView接口,並提供了對Sort屬性的支持,那麼該數據源就可以支持多列排序。為了彌補上面提到的只標記了第一排序列的缺陷,可以手動對進行排序的列設置SortGlyphDirection屬性來標記。

  1 BindingSource bindingSource = new BindingSource();
  2 dgv4.AutoGenerateColumns = false;
  3 dgv4.DataSource = bindingSource;
  4 
  5 DataTable dt = new DataTable();
  6 dt.Columns.Add("C1", typeof(int));
  7 dt.Columns.Add("C2", typeof(string));
  8 dt.Columns.Add("C3", typeof(string));
  9 
 10 dt.Rows.Add(1, "1", "Test1");
 11 dt.Rows.Add(2, "2", "Test2");
 12 dt.Rows.Add(2, "2", "Test1");
 13 dt.Rows.Add(3, "3", "Test3");
 14 dt.Rows.Add(4, "4", "Test4");
 15 dt.Rows.Add(4, "4", "Test3");
 16 
 17 DataView view = dt.DefaultView;
 18 view.Sort = "C2 ASC,C3 DESC";
 19 bindingSource.DataSource = view;
 20 
 21 DataGridViewTextBoxColumn col0 = new DataGridViewTextBoxColumn();
 22 col0.DataPropertyName = "C1";
 23 dgv4.Columns.Add(col0);
 24 col0.SortMode = DataGridViewColumnSortMode.Programmatic;
 25 col0.HeaderCell.SortGlyphDirection = SortOrder.None;
 26 
 27 DataGridViewTextBoxColumn col1 = new DataGridViewTextBoxColumn();
 28 col1.DataPropertyName = "C2";
 29 dgv4.Columns.Add(col1);
 30 col1.SortMode = DataGridViewColumnSortMode.Programmatic;
 31 col1.HeaderCell.SortGlyphDirection = SortOrder.Ascending;
 32 
 33 DataGridViewTextBoxColumn col2 = new DataGridViewTextBoxColumn();
 34 col2.DataPropertyName = "C3";
 35 dgv4.Columns.Add(col2);
 36 col2.SortMode = DataGridViewColumnSortMode.Programmatic;
 37 col2.HeaderCell.SortGlyphDirection = SortOrder.Descending;

需要注意的是,對SortGlyphDirection屬性的設置要在DataGridView綁定DataSource後面操作,否則會不生效。

上面代碼來自資料參考2的,可以簡化成:

DataTable dt = new DataTable();
dt.Columns.Add("C1", typeof(int));
dt.Columns.Add("C2", typeof(string));
dt.Columns.Add("C3", typeof(string));

dt.Rows.Add(1, "1", "Test1");
dt.Rows.Add(2, "2", "Test2");
dt.Rows.Add(2, "2", "Test1");
dt.Rows.Add(3, "3", "Test3");
dt.Rows.Add(4, "4", "Test4");
dt.Rows.Add(4, "4", "Test3");

DataView view = dt.DefaultView;
view.Sort = "C2 ASC,C3 DESC";

dgv4.DataSource = dt;
dgv4.Columns[1].SortMode = DataGridViewColumnSortMode.Programmatic;
dgv4.Columns[1].HeaderCell.SortGlyphDirection = SortOrder.Ascending;
dgv4.Columns[2].SortMode = DataGridViewColumnSortMode.Programmatic;
dgv4.Columns[2].HeaderCell.SortGlyphDirection = SortOrder.Descending;
View Code

2、非綁定數據

為了提供對多個列排序的支持,可以通過處理SortCompare事件,或者調用重載的Sort ( IComparer ) 方法以更靈活的方式進行排序。

2.1、SortCompare事件

private void dgv4_SortCompare(object sender, DataGridViewSortCompareEventArgs e)
{
    try
    {
        e.SortResult = String.Compare(e.CellValue1.ToString(), e.CellValue2.ToString());
        if (e.SortResult == 0 && e.Column.Name != "ID")
        {
            e.SortResult = string.Compare(
                dgv4.Rows[e.RowIndex1].Cells["ID"].Value.ToString(),
                dgv4.Rows[e.RowIndex2].Cells["ID"].Value.ToString());
        }

        e.Handled = true;
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

上面的例子表示當你點擊列頭對某一列進行排序時,如果值相同時,則會按照對應ID值進行排序;所以如果要支持多列排序,在該事件裡處理即可。

2.2、IComparer 接口

樓主擴展了資料裡提供的參考例子,改成通用的多列排序接口實現,

  1 public class RowComparer : IComparer
  2 {
  3     private Dictionary<string, int> m_SortList;
  4 
  5     /// <summary>
  6     /// 排序字符串,格式:(ColName1 AES,ColName2 DESC,ColName3 AES,...)
  7     /// </summary>
  8     public string Sort
  9     {
 10         get;
 11         set;
 12     }
 13 
 14     /// <summary>
 15     /// 構造函數,初始化排序條件
 16     /// </summary>
 17     public RowComparer(string sort)
 18     {
 19         Sort = sort;
 20         try
 21         {
 22             string[] tmp = Sort.Split(',');
 23             m_SortList = new Dictionary<string, int>();
 24             for (int i = 0; i < tmp.Length; i++)
 25             {
 26                 string[] tmp2 = tmp[i].Split(new char[] { ' ' },
 27                     StringSplitOptions.RemoveEmptyEntries);
 28                 string colName = tmp2[0].ToLower();
 29                 int sortType = tmp2[1].ToLower().Equals("AES") ? 1 : -1;
 30                 if (m_SortList.ContainsKey(colName))
 31                 {
 32                     m_SortList[colName] = sortType;
 33                 }
 34                 else
 35                 {
 36                     m_SortList.Add(colName, sortType);
 37                 }
 38             }
 39         }
 40         catch (Exception ex)
 41         {
 42             throw new Exception(ex.Message);
 43         }
 44     }
 45 
 46     #region IComparer 成員
 47 
 48     public int Compare(object x, object y)
 49     {
 50         int compareResult = 0;// 比較結果
 51         int sortMode = 0;// 排序方式
 52         try
 53         {
 54             DataGridViewRow dgvr1 = (DataGridViewRow)x;
 55             DataGridViewRow dgvr2 = (DataGridViewRow)y;
 56             foreach (string colName in m_SortList.Keys)
 57             {
 58                 compareResult = string.Compare(dgvr1.Cells[colName].Value.ToString(),
 59                     dgvr2.Cells[colName].Value.ToString());
 60                 sortMode = m_SortList[colName];
 61                 if (compareResult != 0)
 62                 {
 63                     break;
 64                 }
 65             }
 66         }
 67         catch (Exception ex)
 68         {
 69             MessageBox.Show(ex.Message);
 70         }
 71 
 72         return compareResult * sortMode;
 73     }
 74 
 75     #endregion
 76 }
View Code

Sort屬性采用DataView的Sort屬性設置,然後在RowComparer構造函數對排序字符串進行處理,最後在接口方法Compare中依先後順序逐級排序;

Q6.  綁定List時,如何使DataGridView和List數據源同步修改?(3)

A:當DataGridView綁定List數據源時,對List進行操作後並不會實時更新到DataGridView上,這時候采用BindingList就可以很好的解決問題。BindingList類可以用作創建雙向數據綁定機制的基類。BindingList提供IBindingList接口的具體泛型實現,這樣就不必實現完整的IBindingList接口了。

BindingList還可以通過擴展的AddNew方法支持工廠創建的示例;通過EndNewCancelNew方法實現新項的事務性提交和回滾。

Q7.  如何在用戶刪除記錄時顯示確認對話框?

A:用戶選中一行後按Delete鍵會觸發UserDeletingRow事件(當然,前提是要設置DataGridView的AllowUserToDeleteRows屬性為True才可以),在該事件裡提示用戶是否刪除當前選中記錄即可。

private void dgv4_UserDeletingRow(object sender, DataGridViewRowCancelEventArgs e)
{
    try
    {
        if (!e.Row.IsNewRow)
        {
            if (MessageBox.Show("確定刪除當前選中數據?", "刪除",
                MessageBoxButtons.YesNo, MessageBoxIcon.Question,
                MessageBoxDefaultButton.Button2)
                == System.Windows.Forms.DialogResult.No)
            {
                e.Cancel = true;
            }
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

Q8.  如何為單元格內的控件添加事件處理函數?

A:諸如DataGridViewButtonColumn列裡的Button,DataGridViewCheckBoxColumn列裡的CheckBox等等,要給Button或CheckBox控件添加事件處理函數,則可以通過實現DataGridView的EditingControlShowing事件,該事件是在單元格進入編輯模式時觸發,可以處理執行該編輯控件的自定義初始化。它的第二個參數DataGridViewEditingControlShowingEventArgs類型,其Control屬性就是該單元格內的編輯控件了。拿DataGridViewComboBoxColumn列裡的ComboBox事件舉個例子:

private void dgv4_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
    try
    {
        ComboBox cb = e.Control as ComboBox;
        if (cb != null)
        {
            cb.SelectedIndexChanged -= new EventHandler(cb_SelectedIndexChanged);
            cb.SelectedIndexChanged += cb_SelectedIndexChanged;
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

private void cb_SelectedIndexChanged(object sender, EventArgs e)
{
    MessageBox.Show("Selected Index Changed!");
}
View Code需要注意的是,在EditingControlShowing事件裡對編輯控件進行事件綁定時,要防止其添加多個相同的事件處理函數,所以在綁定事件前可以先移除相應的事件處理函數。

Q9.  如何讓數據顯示區域(列)填充整個DataGridView大小?

A:可以設置DataGridView的AutoSizeColumnsMode屬性,設置為DataGridViewAutoSizeColumnsMode.Fill,此時列寬會自動調整到使所有列寬精確填充控件的顯示區域。當然,你可以通過設置每一列的DataGridViewColumn.FillWeight屬性來設置每一列的相對寬度。

如果只是想把最後一列填充剩下的空間,而前面那些列都是固定大小的,那可以直接設置最後一列的DataGridViewColumn.AutoSizeMode的屬性為 DataGridViewAutoSizeColumnMode.Fill 即可。

Q10.  如何使單元格內文本內容(TextBox)自動換行?

A:設置DataGridViewColumn.DefaultCellStyle.WrapMode = DataGridViewTriState.True;

Q11.  如何設置Image列中當值為NULL時不顯示圖像(默認顯示“X”圖像)?

A:設置Image列的 dataGridView.DefaultCellStyle.NullValue = null;

 

資料參考

1、http://www.cnblogs.com/xiaofengfeng/archive/2011/04/16/2018504.html (主要參考)

2、http://blogs.msdn.com/b/jfoscoding/archive/2005/11/17/494012.aspx

3、https://msdn.microsoft.com/zh-cn/library/ms132679.aspx#Mtps_DropDownFilterTextBindingList

 

 

未完待續……

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