DevExpress.XtraTreeList.TreeList （树控件使用说明）

/// <summary>
/// 二级菜单点击，初始化树
/// </summary>
private void InitRightTree()
{
m_panelRight.Controls.Clear();
//  m_panelRight.Visible = true;
DevExpress.XtraTreeList.TreeList treeList = new DevExpress.XtraTreeList.TreeList();
treeList.OptionsView.ShowCheckBoxes = true;
treeList.Dock = DockStyle.Fill;
m_panelRight.Controls.Add(treeList);
DataTable dt = GetTestData();
treeList.DataSource = dt;
////设置树的ParentFieldName 属性
////设置树的KeyFieldName 属性
treeList.ParentFieldName = "ParentFieldName";
treeList.KeyFieldName = "KeyFieldName";
}
/// <summary>
/// 此处获得绑定树的数据
/// </summary>
/// <returns></returns>
private DataTable GetTestData()
{
DataTable dt = new DataTable();
DataColumn dc = new DataColumn("KeyFieldName");
DataColumn dc3 = new DataColumn("ParentFieldName");
DataColumn dc2 = new DataColumn("name");
dt.Columns.Add(dc);
dt.Columns.Add(dc2);
dt.Columns.Add(dc3);
for (int i = 0; i < 100; i++)
{
DataRow dr = dt.NewRow();
dr["KeyFieldName"] = i;
dr["ParentFieldName"] = (i % 5 == 0 ? "Null" : (i % 5).ToString());
dr["name"] = i + "haha";
dt.Rows.Add(dr);
}
return dt;

}

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树形控件是使用频率很高的一种控件。对于属性控件往往需要下面两个功能
1.TreeList带有CheckBox，并且节点要有三种状态（所有的子节点都选中，所有的子节点都没选择，一部分子节点选中）。使用DevXpress的TreeList控件很容易实现这一功能。
设置TreeList.OptionsView.ShowCheckBoxes = true //是否显示CheckBox
设置TreeList.OptionsBehavior.AllowIndeterminateCheckState = true; //设置节点是否有中间状态，即一部分子节点选中，一部分子节点没有选中
设置这两个属性之后就实现了TreeList带有CheckBox,并且节点有三种状态。
2.选中父节点或者子节点相互影响的功能，如选择父节点选择所有子节点。绑定TreeList的两个事件AfterCheckNode和BeforeCheckNode
实现功能的代码如下：

private void treeList1_AfterCheckNode(object sender, DevExpress.XtraTreeList.NodeEventArgs e)
{
SetCheckedChildNodes(e.Node, e.Node.CheckState);
SetCheckedParentNodes(e.Node, e.Node.CheckState);
}
private void treeList1_BeforeCheckNode(object sender, DevExpress.XtraTreeList.CheckNodeEventArgs e)
{
e.State = (e.PrevState == CheckState.Checked ? CheckState.Unchecked : CheckState.Checked);
}
/// <summary>
/// 设置子节点的状态
/// </summary>
/// <param name="node"></param>
/// <param name="check"></param>
private void SetCheckedChildNodes(TreeListNode node, CheckState check)
{
for (int i = 0; i < node.Nodes.Count; i++)
{
node.Nodes[i].CheckState = check;
SetCheckedChildNodes(node.Nodes[i], check);
}
}
/// <summary>
/// 设置父节点的状态
/// </summary>
/// <param name="node"></param>
/// <param name="check"></param>
private void SetCheck
4000
edParentNodes(TreeListNode node, CheckState check)
{
if (node.ParentNode != null)
{
bool b = false;
CheckState state;
for (int i = 0; i < node.ParentNode.Nodes.Count; i++)
{
state = (CheckState)node.ParentNode.Nodes[i].CheckState;
if (!check.Equals(state))
{
b = !b;
break;
}
}
node.ParentNode.CheckState = b ? CheckState.Indeterminate : check;
SetCheckedParentNodes(node.ParentNode, check);
}
}