WinForm中DataGridView折叠控件【超好看】

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.Expand