C#自定义组件实现表格的多层表头功能
作者：数据的世界01
这篇文章主要为大家详细介绍了如何使用C#自定义组件实现表格的多层表头功能,文中的示例代码讲解详细,感兴趣的小伙伴可以跟随小编一起学习一下
在 WinForms 中，想要实现多层表头功能时，DataGridView 本身并不支持该功能，而且又不希望使用第三方控件，因此选择通过自定义组件来实现这一需求。
首先，展示一下程序实现的效果：
接下来，创建一个继承自 DataGridView 的自定义组件。代码如下：
using System;
using System.ComponentModel;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;
using System.Windows.Forms;
using System.Collections;
using System.Drawing;
namespace CellPaintingDataGridView
{
public partial class TreeHeadDataGridView : DataGridView
{
private TreeView treeView1=new TreeView();
public TreeHeadDataGridView()
{
InitializeComponent();
}
public TreeHeadDataGridView(IContainer container)
{
container.Add(this);
InitializeComponent();
}
[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
public TreeNodeCollection HeadSource
{
get { return this.treeView1.Nodes; }
}
private int _cellHeight = 17;
private int _columnDeep = 1;
[Description("设置或获得合并表头树的深度")]
public int ColumnDeep
{
get
{
if (this.Columns.Count == 0)
_columnDeep = 1;
this.ColumnHeadersHeight = _cellHeight * _columnDeep;
return _columnDeep;
}
set
{
if (value < 1)
_columnDeep = 1;
else
_columnDeep = value;
this.ColumnHeadersHeight = _cellHeight * _columnDeep;
}
}
///<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, 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);
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 * _cellHeight,
uhWidth - 1,
_cellHeight * (_columnDeep - node.Level) - 1);
}
else
{
uhRectangle = new Rectangle(
e.CellBounds.Left,
e.CellBounds.Top + node.Level * _cellHeight,
uhWidth - 1,
_cellHeight - 1);
}
Color backColor = e.CellStyle.BackColor;
if (node.BackColor != Color.Empty)
{
backColor = node.BackColor;
}
SolidBrush backColorBrush = new SolidBrush(backColor);
//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);
写字段文本
Color foreColor = Color.Black;
if (node.ForeColor != Color.Empty)
{
foreColor = node.ForeColor;
}
e.Graphics.DrawString(node.Text, this.Font
, new SolidBrush(foreColor)
, uhRectangle.Left + uhRectangle.Width / 2 -
e.Graphics.MeasureString(node.Text, this.Font).Width / 2 - 1
, uhRectangle.Top +
uhRectangle.Height / 2 - e.Graphics.MeasureString(node.Text, this.Font).Height / 2);
递归调用()
if (node.PrevNode == null)
if (node.Parent != null)
PaintUnitHeader(node.Parent, e, level - 1);
}
/// <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>
/// <remarks></remarks>
private int GetUnitHeaderWidth(TreeNode node)
{
//获得非最底层字段的宽度
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;
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 <= _columnList.Count - 1; i++)
{
if (((TreeNode)_columnList[i]).Equals(node))
return i;
}
return -1;
}
private List<TreeNode> _columnList = new List<TreeNode>();
[Description("最底層結點集合")]
public List<TreeNode> NadirColumnList
{
get
{
if (this.treeView1 == null)
return null;
if (this.treeView1.Nodes == null)
return null;
if (this.treeView1.Nodes.Count == 0)
return null;
_columnList.Clear();
foreach (TreeNode node in this.treeView1.Nodes)
{
//GetNadirColumnNodes(_columnList, node, false);
GetNadirColumnNodes(_columnList, node);
}
return _columnList;
}
}
private void GetNadirColumnNodes(List<TreeNode> alList, TreeNode node)
{
if (node.FirstNode == null)
{
alList.Add(node);
}
foreach (TreeNode n in node.Nodes)
{
GetNadirColumnNodes(alList, n);
}
}
/// <summary>
/// 获得底层字段集合
/// </summary>
/// <param name="alList">底层字段集合</param>
/// <param name="node">字段节点</param>
/// <param name="checked">向上搜索与否</param>
/// <remarks></remarks>
private void GetNadirColumnNodes(List<TreeNode> alList, TreeNode node, Boolean isChecked)
{
if (isChecked == false)
{
if (node.FirstNode == null)
{
alList.Add(node);
if (node.NextNode != null)
{
GetNadirColumnNodes(alList, node.NextNode, false);
return;
}
if (node.Parent != null)
{
GetNadirColumnNodes(alList, node.Parent, true);
return;
}
}
else
{
if (node.FirstNode != null)
{
GetNadirColumnNodes(alList, node.FirstNode, false);
return;
}
}
}
else
{
if (node.FirstNode == null)
{
return;
}
else
{
if (node.NextNode != null)
{
GetNadirColumnNodes(alList, node.NextNode, false);
return;
}
if (node.Parent != null)
{
GetNadirColumnNodes(alList, node.Parent, true);
return;
}
}
}
}
/// <summary>
/// 单元格绘制(重写)
/// </summary>
/// <param name="e"></param>
/// <remarks></remarks>
protected override void OnCellPainting(DataGridViewCellPaintingEventArgs e)
{
//行标题不重写
if (e.ColumnIndex < 0)
{
base.OnCellPainting(e);
return;
}
if (_columnDeep == 1)
{
base.OnCellPainting(e);
return;
}
//绘制表头
if (e.RowIndex == -1)
{
PaintUnitHeader((TreeNode)NadirColumnList[e.ColumnIndex], e, _columnDeep);
e.Handled = true;
}
}
}
}完成组件开发后，可以将该控件从工具箱拖入界面，表头的节点设置通过 Designer.cs 中的 "Windows 窗体设计器生成的代码" 实现。我们使用 System.Windows.Forms.TreeNode 来实现父子节点的绑定。示例代码如下：
namespace CellPaintingDataGridView
{
partial class Form1
{
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
/// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要
/// 使用代码编辑器修改此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.components = new System.ComponentModel.Container();
System.Windows.Forms.TreeNode treeNode1 = new System.Windows.Forms.TreeNode("节点0");
System.Windows.Forms.TreeNode treeNode2 = new System.Windows.Forms.TreeNode("节点1-0-0");
System.Windows.Forms.TreeNode treeNode3 = new System.Windows.Forms.TreeNode("节点1-0-1");
System.Windows.Forms.TreeNode treeNode4 = new System.Windows.Forms.TreeNode("节点1-0", new System.Windows.Forms.TreeNode[] {
treeNode2,
treeNode3});
System.Windows.Forms.TreeNode treeNode5 = new System.Windows.Forms.TreeNode("节点1-1");
System.Windows.Forms.TreeNode treeNode6 = new System.Windows.Forms.TreeNode("节点1", new System.Windows.Forms.TreeNode[] {
treeNode4,
treeNode5});
System.Windows.Forms.TreeNode treeNode7 = new System.Windows.Forms.TreeNode("节点2-0");
System.Windows.Forms.TreeNode treeNode8 = new System.Windows.Forms.TreeNode("节点2-1");
System.Windows.Forms.TreeNode treeNode9 = new System.Windows.Forms.TreeNode("节点2-0");
System.Windows.Forms.TreeNode treeNode10 = new System.Windows.Forms.TreeNode("节点2", new System.Windows.Forms.TreeNode[] {
treeNode7,
treeNode8,
treeNode9});
System.Windows.Forms.TreeNode treeNode11 = new System.Windows.Forms.TreeNode("节点3-0");
System.Windows.Forms.TreeNode treeNode12 = new System.Windows.Forms.TreeNode("节点3-1");
System.Windows.Forms.TreeNode treeNode13 = new System.Windows.Forms.TreeNode("节点3", new System.Windows.Forms.TreeNode[] {
treeNode11,
treeNode12});
this.treeHeadDataGridView1 = new CellPaintingDataGridView.TreeHeadDataGridView(this.components);
this.Column1 = new System.Windows.Forms.DataGridViewTextBoxColumn();
this.Column2 = new System.Windows.Forms.DataGridViewTextBoxColumn();
this.Column3 = new System.Windows.Forms.DataGridViewTextBoxColumn();
this.Column4 = new System.Windows.Forms.DataGridViewTextBoxColumn();
this.Column5 = new System.Windows.Forms.DataGridViewTextBoxColumn();
this.Column6 = new System.Windows.Forms.DataGridViewTextBoxColumn();
this.Column7 = new System.Windows.Forms.DataGridViewTextBoxColumn();
this.Column8 = new System.Windows.Forms.DataGridViewTextBoxColumn();
this.Column9 = new System.Windows.Forms.DataGridViewTextBoxColumn();
((System.ComponentModel.ISupportInitialize)(this.treeHeadDataGridView1)).BeginInit();
this.SuspendLayout();
//
// treeHeadDataGridView1
//
this.treeHeadDataGridView1.ColumnDeep = 3;
this.treeHeadDataGridView1.ColumnHeadersHeight = 51;
this.treeHeadDataGridView1.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.DisableResizing;
this.treeHeadDataGridView1.Columns.AddRange(new System.Windows.Forms.DataGridViewColumn[] {
this.Column1,
this.Column2,
this.Column3,
this.Column4,
this.Column5,
this.Column6,
this.Column7,
this.Column8,
this.Column9});
treeNode1.Name = "节点";
treeNode1.Text = "节点0";
treeNode2.Name = "节点1-0-0";
treeNode2.Text = "节点1-0-0";
treeNode3.Name = "节点1-0-1";
treeNode3.Text = "节点1-0-1";
treeNode4.Name = "节点1-0";
treeNode4.Text = "节点1-0";
treeNode5.Name = "节点1-1";
treeNode5.Text = "节点1-1";
treeNode6.Name = "节点1";
treeNode6.Text = "节点1";
treeNode7.Name = "节点2-0";
treeNode7.Text = "节点2-0";
treeNode8.Name = "节点2-1";
treeNode8.Text = "节点2-1";
treeNode9.Name = "节点2-0";
treeNode9.Text = "节点2-0";
treeNode10.Name = "节点2";
treeNode10.Text = "节点2";
treeNode11.Name = "节点3-0";
treeNode11.Text = "节点3-0";
treeNode12.Name = "节点3-1";
treeNode12.Text = "节点3-1";
treeNode13.Name = "节点3";
treeNode13.Text = "节点3";
this.treeHeadDataGridView1.HeadSource.AddRange(new System.Windows.Forms.TreeNode[] {
treeNode1,
treeNode6,
treeNode10,
treeNode13});
this.treeHeadDataGridView1.Location = new System.Drawing.Point(12, 12);
this.treeHeadDataGridView1.Name = "treeHeadDataGridView1";
this.treeHeadDataGridView1.RowTemplate.Height = 23;
this.treeHeadDataGridView1.Size = new System.Drawing.Size(1034, 456);
this.treeHeadDataGridView1.TabIndex = 0;
//
// Column1
//
this.Column1.HeaderText = "Column1";
this.Column1.Name = "Column1";
this.Column1.Width = 110;
//
// Column2
//
this.Column2.FillWeight = 80F;
this.Column2.HeaderText = "Column2";
this.Column2.Name = "Column2";
//
// Column3
//
this.Column3.FillWeight = 60F;
this.Column3.HeaderText = "Column3";
this.Column3.Name = "Column3";
this.Column3.Width = 160;
//
// Column4
//
this.Column4.HeaderText = "Column4";
this.Column4.Name = "Column4";
//
// Column5
//
this.Column5.HeaderText = "Column5";
this.Column5.Name = "Column5";
//
// Column6
//
this.Column6.HeaderText = "Column6";
this.Column6.Name = "Column6";
//
// Column7
//
this.Column7.HeaderText = "Column7";
this.Column7.Name = "Column7";
//
// Column8
//
this.Column8.HeaderText = "Column8";
this.Column8.Name = "Column8";
//
// Column9
//
this.Column9.HeaderText = "Column9";
this.Column9.Name = "Column9";
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(1077, 533);
this.Controls.Add(this.treeHeadDataGridView1);
this.Name = "Form1";
this.Text = "Form1";
((System.ComponentModel.ISupportInitialize)(this.treeHeadDataGridView1)).EndInit();
this.ResumeLayout(false);
}
#endregion
private TreeHeadDataGridView treeHeadDataGridView1;
private System.Windows.Forms.DataGridViewTextBoxColumn Column1;
private System.Windows.Forms.DataGridViewTextBoxColumn Column2;
private System.Windows.Forms.DataGridViewTextBoxColumn Column3;
private System.Windows.Forms.DataGridViewTextBoxColumn Column4;
private System.Windows.Forms.DataGridViewTextBoxColumn Column5;
private System.Windows.Forms.DataGridViewTextBoxColumn Column6;
private System.Windows.Forms.DataGridViewTextBoxColumn Column7;
private System.Windows.Forms.DataGridViewTextBoxColumn Column8;
private System.Windows.Forms.DataGridViewTextBoxColumn Column9;
}
}通过这种方式，我们成功实现了多层表头的功能，完全依赖自定义组件，不需要第三方控件。
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