请假一个DataGridView重绘问题

黑魔呆呆 2016-12-02 11:37:50

如下图，DataGridView向右拉没事，但是向左拉列头会变成黑色，请问要怎么处理？

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threenewbee 2016-12-03

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你是怎么重绘的，重绘的代码是先于系统的重绘执行的么

黑魔呆呆 2016-12-03

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上面是重绘DataGridView的代码，请大神看看

黑魔呆呆 2016-12-03

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public partial class MultiColHeaderDgv : DataGridView { #region 字段定義 /// <summary>多維列標題的樹結構 /// /// </summary> private TreeView _ColHeaderTreeView; /// <summary>樹的最大層數 /// /// </summary> private int iNodeLevels; /// <summary>一維列標題的高度 /// /// </summary> private int iCellHeight; /// <summary>所有葉節點 /// /// </summary> private IList<TreeNode> ColLists = new List<TreeNode>(); #endregion #region 屬性定義 /// <summary>多維列標題的樹結構 /// /// </summary> [ Description("多維列標題的樹結構") ] public TreeView myColHeaderTreeView { get { return _ColHeaderTreeView; } set { _ColHeaderTreeView = value; } } #endregion #region 方法函數 /// <summary>遞歸計算樹最大層數，並保存所有葉節點 /// /// </summary> /// <param name="tnc"></param> /// <returns></returns> private int myGetNodeLevels(TreeNodeCollection tnc) { if (tnc == null) return 0; foreach (TreeNode tn in tnc) { if ((tn.Level + 1) > iNodeLevels)//tn.Level是從0開始的 { iNodeLevels = tn.Level + 1; } if (tn.Nodes.Count > 0) { myGetNodeLevels(tn.Nodes); } else { ColLists.Add(tn);//葉節點 } } return iNodeLevels; } /// <summary>調用遞歸求最大層數、列頭總高 /// /// </summary> public void myNodeLevels() { iNodeLevels = 1;//初始為1 ColLists.Clear(); int iNodeDeep = myGetNodeLevels(_ColHeaderTreeView.Nodes); iCellHeight = this.ColumnHeadersHeight; this.ColumnHeadersHeight = this.ColumnHeadersHeight * iNodeDeep;//列頭總高=一維列高*層數 } /// <summary>获得合并标题字段的宽度 /// /// </summary> /// <param name="node">字段节点</param> /// <returns>字段宽度</returns> private int GetUnitHeaderWidth(TreeNode node) { int uhWidth = 0; //获得最底层字段的宽度 if (node.Nodes == null) return this.Columns[GetColumnListNodeIndex(node)].Width; if (node.Nodes.Count == 0) return this.Columns[GetColumnListNodeIndex(node)].Width; //获得非最底层字段的宽度 for (int i = 0; i <= node.Nodes.Count - 1; i++) { uhWidth = uhWidth + GetUnitHeaderWidth(node.Nodes[i]); } return uhWidth; } /// <summary>获得底层字段索引 /// /// </summary> ///' <param name="node">底层字段节点</param> /// <returns>索引</returns> /// <remarks></remarks> private int GetColumnListNodeIndex(TreeNode node) { for (int i = 0; i <= ColLists.Count - 1; i++) { if (ColLists[i].Equals(node)) return i; } return -1; } ///<summary>绘制合并表头 /// ///</summary> ///<param name="node">合并表头节点</param> ///<param name="e">绘图参数集</param> ///<param name="level">结点深度</param> ///<remarks></remarks> public void PaintUnitHeader( TreeNode node, System.Windows.Forms.DataGridViewCellPaintingEventArgs e, int level) { //根节点时退出递归调用 if (level == 0) return; RectangleF uhRectangle; int uhWidth; SolidBrush gridBrush = new SolidBrush(this.GridColor); SolidBrush backColorBrush = new SolidBrush(e.CellStyle.BackColor); Pen gridLinePen = new Pen(gridBrush); StringFormat textFormat = new StringFormat(); textFormat.Alignment = StringAlignment.Center; uhWidth = GetUnitHeaderWidth(node); //与原贴算法有所区别在这。 if (node.Nodes.Count == 0) { uhRectangle = new Rectangle(e.CellBounds.Left, e.CellBounds.Top + node.Level * iCellHeight, uhWidth - 1, iCellHeight * (iNodeLevels - node.Level) - 1); } else { uhRectangle = new Rectangle( e.CellBounds.Left, e.CellBounds.Top + node.Level * iCellHeight, uhWidth - 1, iCellHeight - 1); } //画矩形 e.Graphics.FillRectangle(backColorBrush, uhRectangle); //划底线 e.Graphics.DrawLine(gridLinePen , uhRectangle.Left , uhRectangle.Bottom , uhRectangle.Right , uhRectangle.Bottom); //划右端线 e.Graphics.DrawLine(gridLinePen , uhRectangle.Right , uhRectangle.Top , uhRectangle.Right , uhRectangle.Bottom); e.Graphics.DrawString(node.Text, this.ColumnHeadersDefaultCellStyle.Font , Brushes.Black , uhRectangle.Left + uhRectangle.Width / 2 - e.Graphics.MeasureString(node.Text, this.ColumnHeadersDefaultCellStyle.Font).Width / 2 - 1 , uhRectangle.Top + uhRectangle.Height / 2 - e.Graphics.MeasureString(node.Text, this.ColumnHeadersDefaultCellStyle.Font).Height / 2); //递归调用() if (node.PrevNode == null) if (node.Parent != null) PaintUnitHeader(node.Parent, e, level - 1); } #endregion //重寫表頭 protected override void OnCellPainting(DataGridViewCellPaintingEventArgs e) { try { //行标题不重写 if (e.ColumnIndex < 0) { base.OnCellPainting(e); return; } if (iNodeLevels == 1) { base.OnCellPainting(e); return; } //绘制表头 if (e.RowIndex == -1) { if (_ColHeaderTreeView != null) { if (iNodeLevels == 0) { myNodeLevels(); } PaintUnitHeader((TreeNode)this.ColLists[e.ColumnIndex], e, iNodeLevels); e.Handled = true; } else { base.OnCellPainting(e); } } } catch (Exception ex) { MessageBox.Show(this, ex.Message, "Error"); } } }