刚到一家新公司，领导下发任务要用cs系统做一个表格折叠显示，这真是把我难倒了，自己工作6年一直以来都是做BS的系统。这如果在BS里面那太简单了，JqGrid默认都自带，可是DataGridview不支持折叠啊。自己一点经验没有，怎么办呢？于是上网搜了相关视频，资料，开始学习起来。最后借鉴源码封了这么一个东西，发出来分享下，也能让自己加深印象。

首先不多说，上图。如果大家感谢还不错，请继续往下阅读：

大概的效果就是这样。

上代码。

1、首先重写DataGridview，代码如下：

public class MasterControl : DataGridView { #region 字段 private List<int> rowCurrent = new List<int>(); internal static int rowDefaultHeight = ; internal static int rowExpandedHeight = ; internal static int rowDefaultDivider = ; internal static int rowExpandedDivider = - ; internal static int rowDividerMargin = ; internal static bool collapseRow; //detailControl变量作为一个容器用来保存子表格 public detailControl childView = new detailControl() { Visible = false }; // VBConversions Note: Initial value cannot be assigned here since it is non-static. Assignment has been moved to the class constructors. // internal System.Windows.Forms.ImageList RowHeaderIconList; private System.ComponentModel.Container components = null; // DataSet _cDataset; string _foreignKey; string _primaryKey; string _filterFormat; private controlType EControlType; public int ExpandRowIndex = ; #endregion #region 构造函数 /// <summary> /// 通过传递过来的枚举判断是两级还是三级展开，表的对应关系通过Relations来读取 /// 所以调用此构造函数的时候必须要讲Relations设置正确，才能正确显示层级关系。 /// oDataSet.Relations.Add("", oDataSet.Tables["T"].Columns["Menu_ID"], oDataSet.Tables["T"].Columns["Menu_ID"]); /// oDataSet.Relations.Add("", oDataSet.Tables["T"].Columns["Menu_Name"], oDataSet.Tables["T"].Columns["Menu_Name"]); /// 这两次Add的顺序不能颠倒，必须先添加一、二级的表关联，再添加二、三级的表关联 /// </summary> /// <param name="cDataset">数据源DataSet，里面还有各个表的对应关系</param> /// <param name="eControlType">枚举类型</param> public MasterControl(DataSet cDataset, controlType eControlType) { SetMasterControl(cDataset, eControlType); } /// <summary> /// 第二种使用方法 /// </summary> /// <param name="lstData">折叠控件第一层的集合</param> /// <param name="lstData">折叠控件第二层的集合</param> /// <param name="lstData">折叠控件第三层的集合</param> /// <param name="dicRelateKey">第一二层之间对应主外键</param> /// <param name="dicRelateKey">第二三层之间对应主外键</param> /// <param name="eControlType">枚举类型</param> public MasterControl(object lstData, object lstData, object lstData, Dictionary<string, string> dicRelateKey, Dictionary<string ,string>dicRelateKey, controlType eControlType) { var oDataSet = new DataSet(); try { var oTable = new DataTable(); oTable = Fill(lstData); oTable.TableName = "T"; var oTable = Fill(lstData); oTable.TableName = "T"; if (lstData == null || dicRelateKey == null || dicRelateKey.Keys.Count <= ) { oDataSet.Tables.AddRange(new DataTable[] { oTable, oTable }); oDataSet.Relations.Add("", oDataSet.Tables["T"].Columns[dicRelateKey.Keys.FirstOrDefault()], oDataSet.Tables["T"].Columns[dicRelateKey.Values.FirstOrDefault()]); } else { var oTable = Fill(lstData); oTable.TableName = "T"; oDataSet.Tables.AddRange(new DataTable[] { oTable, oTable, oTable }); //这是对应关系的时候主键必须唯一 oDataSet.Relations.Add("", oDataSet.Tables["T"].Columns[dicRelateKey.Keys.FirstOrDefault()], oDataSet.Tables["T"].Columns[dicRelateKey.Values.FirstOrDefault()]); oDataSet.Relations.Add("", oDataSet.Tables["T"].Columns[dicRelateKey.Keys.FirstOrDefault()], oDataSet.Tables["T"].Columns[dicRelateKey.Values.FirstOrDefault()]); } } catch { oDataSet = new DataSet(); } SetMasterControl(oDataSet, eControlType); } /// <summary> /// 控件初始化 /// </summary> private void InitializeComponent() { this.components = new System.ComponentModel.Container(); base.RowHeaderMouseClick += new System.Windows.Forms.DataGridViewCellMouseEventHandler(MasterControl_RowHeaderMouseClick); base.RowPostPaint += new System.Windows.Forms.DataGridViewRowPostPaintEventHandler(MasterControl_RowPostPaint); base.Scroll += new System.Windows.Forms.ScrollEventHandler(MasterControl_Scroll); base.SelectionChanged += new System.EventHandler(MasterControl_SelectionChanged); System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(MasterControl)); this.RowHeaderIconList = new System.Windows.Forms.ImageList(this.components); ((System.ComponentModel.ISupportInitialize)this).BeginInit(); this.SuspendLayout(); // //RowHeaderIconList // this.RowHeaderIconList.ImageStream = (System.Windows.Forms.ImageListStreamer)(resources.GetObject("RowHeaderIconList.ImageStream")); this.RowHeaderIconList.TransparentColor = System.Drawing.Color.Transparent; this.RowHeaderIconList.Images.SetKeyName(, "expand.png"); this.RowHeaderIconList.Images.SetKeyName(, "collapse.png"); // //MasterControl // ((System.ComponentModel.ISupportInitialize)this).EndInit(); this.ResumeLayout(false); } #endregion #region 数据绑定 /// <summary> /// 设置表之间的主外键关联 /// </summary> /// <param name="tableName">DataTable的表名称</param> /// <param name="foreignKey">外键</param> public void setParentSource(string tableName, string primarykey, string foreignKey) { this.DataSource = new DataView(_cDataset.Tables[tableName]); cModule.setGridRowHeader(this); _foreignKey = foreignKey; _primaryKey = primarykey; if (_cDataset.Tables[tableName].Columns[primarykey].GetType().ToString() == typeof(int).ToString() || _cDataset.Tables[tableName].Columns[primarykey].GetType().ToString() == typeof(double).ToString() || _cDataset.Tables[tableName].Columns[primarykey].GetType().ToString() == typeof(decimal).ToString()) { _filterFormat = foreignKey + "={}"; } else { _filterFormat = foreignKey + "='{}'"; } } #endregion #region 事件 //控件的行头点击事件 private void MasterControl_RowHeaderMouseClick(object sender, DataGridViewCellMouseEventArgs e) { try { Rectangle rect = new Rectangle(System.Convert.ToInt((double)(rowDefaultHeight - ) / ), System.Convert.ToInt((double)(rowDefaultHeight - ) / ), , ); if (rect.Contains(e.Location)) { //缩起 if (rowCurrent.Contains(e.RowIndex)) { rowCurrent.Clear(); this.Rows[e.RowIndex].Height = rowDefaultHeight; this.Rows[e.RowIndex].DividerHeight = rowDefaultDivider; this.ClearSelection(); collapseRow = true; this.Rows[e.RowIndex].Selected = true; if (EControlType == controlType.middle) { var oParent = ((MasterControl)this.Parent.Parent); oParent.Rows[oParent.ExpandRowIndex].Height = rowDefaultHeight * (this.Rows.Count + ); oParent.Rows[oParent.ExpandRowIndex].DividerHeight = rowDefaultHeight * (this.Rows.Count + ); if (oParent.Rows[oParent.ExpandRowIndex].Height > ) { oParent.Rows[oParent.ExpandRowIndex].Height = ; oParent.Rows[oParent.ExpandRowIndex].Height = ; } } } //展开 else { if (!(rowCurrent.Count == )) { var eRow = rowCurrent[]; rowCurrent.Clear(); this.Rows[eRow].Height = rowDefaultHeight; this.Rows[eRow].DividerHeight = rowDefaultDivider; this.ClearSelection(); collapseRow = true; this.Rows[eRow].Selected = true; } rowCurrent.Add(e.RowIndex); this.ClearSelection(); collapseRow = true; this.Rows[e.RowIndex].Selected = true; this.ExpandRowIndex = e.RowIndex; this.Rows[e.RowIndex].Height = + rowDefaultHeight * (((DataView)(childView.childGrid[].DataSource)).Count + ); this.Rows[e.RowIndex].DividerHeight = + rowDefaultHeight * (((DataView)(childView.childGrid[].DataSource)).Count); //设置一个最大高度 if (this.Rows[e.RowIndex].Height > ) { this.Rows[e.RowIndex].Height = ; this.Rows[e.RowIndex].DividerHeight = ; } if (EControlType == controlType.middle) { if (this.Parent.Parent.GetType() != typeof(MasterControl)) return; var oParent = ((MasterControl)this.Parent.Parent); oParent.Rows[oParent.ExpandRowIndex].Height = this.Rows[e.RowIndex].Height + rowDefaultHeight * (this.Rows.Count + ); oParent.Rows[oParent.ExpandRowIndex].DividerHeight = this.Rows[e.RowIndex].DividerHeight + rowDefaultHeight * (this.Rows.Count + ); if (oParent.Rows[oParent.ExpandRowIndex].Height > ) { oParent.Rows[oParent.ExpandRowIndex].Height = ; oParent.Rows[oParent.ExpandRowIndex].Height = ; } } //if (EControlType == controlType.outside) //{ // //SetControl(this); //} //this.Rows[e.RowIndex].Height = rowExpandedHeight; //this.Rows[e.RowIndex].DividerHeight = rowExpandedDivider; } //this.ClearSelection(); //collapseRow = true; //this.Rows[e.RowIndex].Selected = true; } else { collapseRow = false; } } catch (Exception ex) { } } //控件的行重绘事件 private void MasterControl_RowPostPaint(object obj_sender, DataGridViewRowPostPaintEventArgs e) { try { var sender = (DataGridView)obj_sender; //set childview control var rect = new Rectangle((int)(e.RowBounds.X + ((double)(rowDefaultHeight - ) / )), (int)(e.RowBounds.Y + ((double)(rowDefaultHeight - ) / )), , ); if (collapseRow) { if (this.rowCurrent.Contains(e.RowIndex)) { #region 更改点开后背景色 刘金龙 var rect = new Rectangle(e.RowBounds.X, e.RowBounds.Y + rowDefaultHeight, e.RowBounds.Width, e.RowBounds.Height - rowDefaultHeight); using (Brush b = new SolidBrush(Color.FromArgb(, , ))) { e.Graphics.FillRectangle(b, rect); } #endregion sender.Rows[e.RowIndex].DividerHeight = sender.Rows[e.RowIndex].Height - rowDefaultHeight; e.Graphics.DrawImage(RowHeaderIconList.Images[(int)rowHeaderIcons.collapse], rect); childView.Location = new Point(e.RowBounds.Left + sender.RowHeadersWidth, e.RowBounds.Top + rowDefaultHeight + ); childView.Width = e.RowBounds.Right - sender.RowHeadersWidth; childView.Height = System.Convert.ToInt(sender.Rows[e.RowIndex].DividerHeight - ); childView.Visible = true; } else { childView.Visible = false; e.Graphics.DrawImage(RowHeaderIconList.Images[(int)rowHeaderIcons.expand], rect); } collapseRow = false; } else { if (this.rowCurrent.Contains(e.RowIndex)) { #region 更改点开后背景色 刘金龙 var rect = new Rectangle(e.RowBounds.X, e.RowBounds.Y + rowDefaultHeight, e.RowBounds.Width, e.RowBounds.Height - rowDefaultHeight); using (Brush b = new SolidBrush(Color.FromArgb(,,))) { e.Graphics.FillRectangle(b, rect); } #endregion sender.Rows[e.RowIndex].DividerHeight = sender.Rows[e.RowIndex].Height - rowDefaultHeight; e.Graphics.DrawImage(RowHeaderIconList.Images[(int)rowHeaderIcons.collapse], rect); childView.Location = new Point(e.RowBounds.Left + sender.RowHeadersWidth, e.RowBounds.Top + rowDefaultHeight + ); childView.Width = e.RowBounds.Right - sender.RowHeadersWidth; childView.Height = System.Convert.ToInt(sender.Rows[e.RowIndex].DividerHeight - ); childView.Visible = true; } else { childView.Visible = false; e.Graphics.DrawImage(RowHeaderIconList.Images[(int)rowHeaderIcons.expand], rect); } } cModule.rowPostPaint_HeaderCount(sender, e); } catch { } } //控件的滚动条滚动事件 private void MasterControl_Scroll(object sender, ScrollEventArgs e) { try { if (!(rowCurrent.Count == )) { collapseRow = true; this.ClearSelection(); this.Rows[rowCurrent[]].Selected = true; } } catch { } } //控件的单元格选择事件 private void MasterControl_SelectionChanged(object sender, EventArgs e) { try { if (!(this.RowCount == )) { if (rowCurrent.Contains(this.CurrentRow.Index)) { foreach (DataGridView cGrid in childView.childGrid) { ((DataView)cGrid.DataSource).RowFilter = string.Format(_filterFormat, this[_primaryKey, this.CurrentRow.Index].Value); } } } } catch { } } #endregion #region Private //设置构造函数的参数 private void SetMasterControl(DataSet cDataset, controlType eControlType) { //.控件初始化赋值 this.Controls.Add(childView); InitializeComponent(); _cDataset = cDataset; childView._cDataset = cDataset; cModule.applyGridTheme(this); Dock = DockStyle.Fill; EControlType = eControlType; this.AllowUserToAddRows = false; //.通过读取DataSet里面的Relations得到表的关联关系 if (cDataset.Relations.Count <= ) { return; } DataRelation oRelates; if (eControlType == controlType.outside) { oRelates = cDataset.Relations[]; childView.Add(oRelates.ParentTable.TableName, oRelates.ParentColumns[].ColumnName, oRelates.ChildColumns[].ColumnName); } else if (eControlType == controlType.middle) { oRelates = cDataset.Relations[cDataset.Relations.Count - ]; childView.Add(oRelates.ChildTable.TableName); } //.设置主外键对应关系 oRelates = cDataset.Relations[]; //主表里面的值，副表里面的过滤字段 setParentSource(oRelates.ParentTable.TableName,oRelates.ParentColumns[].ColumnName, oRelates.ChildColumns[].ColumnName); } private void SetControl(MasterControl oGrid) { oGrid.childView.RemoveControl(); //oGrid.childView.Controls.RemoveByKey("ChildrenMaster"); // //var oRelates = _cDataset.Relations[]; //oGrid.childView.Add(oRelates.ParentTable.TableName, oRelates.ChildColumns[].ColumnName); //foreach (var oGridControl in oGrid.Controls) //{ // if (oGridControl.GetType() != typeof(detailControl)) // { // continue; // } // var DetailControl =(detailControl)oGridControl; // foreach (var odetailControl in DetailControl.Controls) // { // if (odetailControl.GetType() != typeof(MasterControl)) // { // continue; // } // var OMasterControl = (MasterControl)odetailControl; // foreach (var oMasterControl in OMasterControl.Controls) // { // if (oMasterControl.GetType() == typeof(detailControl)) // { // ((detailControl)oMasterControl).Visible = false; // return; // } // } // } //} } //将List集合转换成DataTable private DataTable Fill(object obj) { if(!(obj is IList)) { return null; } var objlist = obj as IList; if (objlist == null || objlist.Count <= ) { return null; } var tType = objlist[]; DataTable dt = new DataTable(tType.GetType().Name); DataColumn column; DataRow row; System.Reflection.PropertyInfo[] myPropertyInfo = tType.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance); foreach (var t in objlist) { if (t == null) { continue; } row = dt.NewRow(); for (int i = , j = myPropertyInfo.Length; i < j; i++) { System.Reflection.PropertyInfo pi = myPropertyInfo[i]; string name = pi.Name; if (dt.Columns[name] == null) { column = new DataColumn(name, pi.PropertyType); dt.Columns.Add(column); } row[name] = pi.GetValue(t, null); } dt.Rows.Add(row); } return dt; } #endregion }

2、detailControl变量作为一个容器用来保存子表格

代码如下：

public class detailControl : Ewin.Client.Frame.Controls.EwinPanel { #region 字段 public List<DataGridView> childGrid = new List<DataGridView>(); public DataSet _cDataset; #endregion #region 方法 public void Add(string tableName, string strPrimaryKey, string strForeignKey) { //TabPage tPage = new TabPage() { Text = pageCaption }; //this.Controls.Add(tPage); var newGrid = new MasterControl(_cDataset, controlType.middle) { Dock = DockStyle.Fill, DataSource = new DataView(_cDataset.Tables[tableName]) }; newGrid.setParentSource(tableName, strPrimaryKey, strForeignKey);//设置主外键 //newGrid.Name = "ChildrenMaster"; //tPage.Controls.Add(newGrid); this.Controls.Add(newGrid); //this.BorderStyle = BorderStyle.FixedSingle; cModule.applyGridTheme(newGrid); cModule.setGridRowHeader(newGrid); newGrid.RowPostPaint += cModule.rowPostPaint_HeaderCount; childGrid.Add(newGrid); } public void Add(string tableName) { //TabPage tPage = new TabPage() { Text = pageCaption }; //this.Controls.Add(tPage); DataGridView newGrid = new Ewin.Client.Frame.Controls.EwinGrid() { Dock = DockStyle.Fill, DataSource = new DataView(_cDataset.Tables[tableName]) }; newGrid.AllowUserToAddRows = false; //tPage.Controls.Add(newGrid); this.Controls.Add(newGrid); cModule.applyGridTheme(newGrid); cModule.setGridRowHeader(newGrid); newGrid.RowPostPaint += cModule.rowPostPaint_HeaderCount; childGrid.Add(newGrid); } public void RemoveControl() { this.Controls.Remove(childGrid[]); childGrid.Clear(); } #endregion }

3、cModule.cs用来设置样式

namespace Ewin.Client.Frame.UcGrid { /// <summary> /// 折叠控件样式以及行数操作类 /// </summary> sealed class cModule { #region CustomGrid static System.Windows.Forms.DataGridViewCellStyle dateCellStyle = new System.Windows.Forms.DataGridViewCellStyle { Alignment = DataGridViewContentAlignment.MiddleRight }; static System.Windows.Forms.DataGridViewCellStyle amountCellStyle = new System.Windows.Forms.DataGridViewCellStyle { Alignment = DataGridViewContentAlignment.MiddleRight, Format = "N" }; static System.Windows.Forms.DataGridViewCellStyle gridCellStyle = new System.Windows.Forms.DataGridViewCellStyle { Alignment = System.Windows.Forms.DataGridViewContentAlignment.MiddleLeft, BackColor = System.Drawing.Color.FromArgb(System.Convert.ToInt(System.Convert.ToByte()), System.Convert.ToInt(System.Convert.ToByte()), System.Convert.ToInt(System.Convert.ToByte())), Font = new System.Drawing.Font("Segoe UI", (float)(.F), System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, System.Convert.ToByte()), ForeColor = System.Drawing.SystemColors.ControlLightLight, SelectionBackColor = System.Drawing.SystemColors.Highlight, SelectionForeColor = System.Drawing.SystemColors.HighlightText, WrapMode = System.Windows.Forms.DataGridViewTriState.True }; static System.Windows.Forms.DataGridViewCellStyle gridCellStyle = new System.Windows.Forms.DataGridViewCellStyle { Alignment = System.Windows.Forms.DataGridViewContentAlignment.MiddleLeft, BackColor = System.Drawing.SystemColors.ControlLightLight, Font = new System.Drawing.Font("Segoe UI", (float)(.F), System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, System.Convert.ToByte()), ForeColor = System.Drawing.SystemColors.ControlText, SelectionBackColor = System.Drawing.Color.FromArgb(System.Convert.ToInt(System.Convert.ToByte()), System.Convert.ToInt(System.Convert.ToByte()), System.Convert.ToInt(System.Convert.ToByte())), SelectionForeColor = System.Drawing.SystemColors.HighlightText, WrapMode = System.Windows.Forms.DataGridViewTriState.False }; static System.Windows.Forms.DataGridViewCellStyle gridCellStyle = new System.Windows.Forms.DataGridViewCellStyle { Alignment = System.Windows.Forms.DataGridViewContentAlignment.MiddleLeft, BackColor = System.Drawing.Color.WhiteSmoke, Font = new System.Drawing.Font("Segoe UI", (float)(.F), System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, System.Convert.ToByte()), ForeColor = System.Drawing.SystemColors.WindowText, SelectionBackColor = System.Drawing.Color.FromArgb(System.Convert.ToInt(System.Convert.ToByte()), System.Convert.ToInt(System.Convert.ToByte()), System.Convert.ToInt(System.Convert.ToByte())), SelectionForeColor = System.Drawing.SystemColors.HighlightText, WrapMode = System.Windows.Forms.DataGridViewTriState.True }; //设置表格的主题样式 static public void applyGridTheme(DataGridView grid) { grid.AllowUserToAddRows = false; grid.AllowUserToDeleteRows = false; grid.BackgroundColor = System.Drawing.SystemColors.Window; grid.BorderStyle = System.Windows.Forms.BorderStyle.None; grid.ColumnHeadersBorderStyle = System.Windows.Forms.DataGridViewHeaderBorderStyle.Single; grid.ColumnHeadersDefaultCellStyle = gridCellStyle; grid.ColumnHeadersHeight = ; grid.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.DisableResizing; grid.DefaultCellStyle = gridCellStyle; grid.EnableHeadersVisualStyles = false; grid.GridColor = System.Drawing.SystemColors.GradientInactiveCaption; //grid.ReadOnly = true; grid.RowHeadersVisible = true; grid.RowHeadersBorderStyle = System.Windows.Forms.DataGridViewHeaderBorderStyle.Single; grid.RowHeadersDefaultCellStyle = gridCellStyle; grid.Font = gridCellStyle.Font; } //设置表格单元格样式 static public void setGridRowHeader(DataGridView dgv, bool hSize = false) { dgv.TopLeftHeaderCell.Value = "NO "; dgv.TopLeftHeaderCell.Style.Alignment = DataGridViewContentAlignment.MiddleCenter; dgv.AutoResizeRowHeadersWidth(DataGridViewRowHeadersWidthSizeMode.AutoSizeToDisplayedHeaders); foreach (DataGridViewColumn cCol in dgv.Columns) { if (cCol.ValueType.ToString() == typeof(DateTime).ToString()) { cCol.DefaultCellStyle = dateCellStyle; } else if (cCol.ValueType.ToString() == typeof(decimal).ToString() || cCol.ValueType.ToString() == typeof(double).ToString()) { cCol.DefaultCellStyle = amountCellStyle; } } if (hSize) { dgv.RowHeadersWidth = dgv.RowHeadersWidth + ; } dgv.AutoResizeColumns(); } //设置表格的行号 static public void rowPostPaint_HeaderCount(object obj_sender, DataGridViewRowPostPaintEventArgs e) { try { var sender = (DataGridView)obj_sender; //set rowheader count DataGridView grid = (DataGridView)sender; string rowIdx = System.Convert.ToString((e.RowIndex + ).ToString()); var centerFormat = new StringFormat(); centerFormat.Alignment = StringAlignment.Center; centerFormat.LineAlignment = StringAlignment.Center; Rectangle headerBounds = new Rectangle(e.RowBounds.Left, e.RowBounds.Top, grid.RowHeadersWidth, e.RowBounds.Height - sender.Rows[e.RowIndex].DividerHeight); e.Graphics.DrawString(rowIdx, grid.Font, SystemBrushes.ControlText, headerBounds, centerFormat); } catch (Exception ex) { } } #endregion } /// <summary> /// 控件类型，是最外层的表格还是中间层的表格 /// </summary> public enum controlType { outside = , middle = } /// <summary> /// 展开图标 /// </summary> public enum rowHeaderIcons { expand = , collapse = } }

4、From页面调用

#region 使用方法一

//var oDataSet = GetDataSet(); // //masterDetail = new MasterControl(oDataSet, controlType.outside); #endregion

#region 使用方法二

var dicRelateData1 = new Dictionary<string, string>(); var dicRelateData2 = new Dictionary<string, string>(); dicRelateData1.Add("Menu_ID","Menu_ID");//表格一和表格二之间的主外键关系 dicRelateData2.Add("Menu_Name2","Menu_Name2");//表格二和表格三之间的主外键关系 masterDetail = new MasterControl(GetDataSource(), GetDataSource2(), GetDataSource3(), dicRelateData1, dicRelateData2, controlType.outside); #endregion panelView.Controls.Add(masterDetail);

昨天应领导要求，折叠控件增加了折叠线的效果，看起来有没有更加像模像样了。~~~

其实就在行重绘事件private void MasterControl_RowPostPaint(object obj_sender, DataGridViewRowPostPaintEventArgs e)里面增加了如下代码：

using (Pen p = new Pen(Color.GhostWhite)) { var iHalfWidth = (e.RowBounds.Left + sender.RowHeadersWidth) / 2; var oPointHLineStart = new Point(rect1.X + iHalfWidth, rect1.Y); var oPointHLineEnd = new Point(rect1.X + iHalfWidth, rect1.Y + rect1.Height / 2); e.Graphics.DrawLine(p, oPointHLineStart, oPointHLineEnd); //折叠线 e.Graphics.DrawLine(p, oPointHLineEnd, new Point(oPointHLineEnd.X + iHalfWidth, oPointHLineEnd.Y)); }

效果如下：

以上所述是小编给大家介绍的WinForm中DataGridView折叠控件的相关知识，希望对大家有所帮助！