第一种:DataSource绑定,这种绑定方式需要设置TreeList的ParentFieldName和KeyFieldName两个属性，这里需要注意的是KeyFieldName的值必须是唯一的。
代码如下:
private void Form1_Load(object sender, EventArgs e) { try { //构建一个DataTable数据源 DataTable table = new DataTable(); table.Columns.Add("parentId"); table.Columns.Add("Id"); table.Columns.Add("parentName"); table.Columns.Add("Name"); DataRow row = table.NewRow(); row["parentId"] = ""; row["Id"] = "*"; row["Name"] = "所有颜色"; table.Rows.Add(row); row = table.NewRow(); row["parentId"] = "*"; row["Id"] = "1"; row["Name"] = "红色"; table.Rows.Add(row); row = table.NewRow(); row["parentId"] = "*"; row["Id"] = "2"; row["Name"] = "黄色"; table.Rows.Add(row); row = table.NewRow(); row["parentId"] = "*"; row["Id"] = "3"; row["Name"] = "绿色"; table.Rows.Add(row); row = table.NewRow(); row["parentId"] = "1"; row["Id"] = "01"; row["Name"] = "粉红色"; table.Rows.Add(row); row = table.NewRow(); row["parentId"] = "2"; row["Id"] = "02"; row["Name"] = "鹅黄色"; table.Rows.Add(row); treeList1.ParentFieldName = "parentId"; treeList1.KeyFieldName = "Id"; treeList1.DataSource = table; treeList1.ExpandAll(); } catch (Exception ex) { MessageBox.Show(ex.Message); } } private void treeList1_BeforeCheckNode(object sender, DevExpress.XtraTreeList.CheckNodeEventArgs e) { e.State = (e.PrevState == CheckState.Checked ? CheckState.Unchecked : CheckState.Checked); } private void treeList1_AfterCheckNode(object sender, DevExpress.XtraTreeList.NodeEventArgs e) { try { SetCheckedChildNodes(e.Node, e.Node.CheckState); SetCheckedParentNodes(e.Node, e.Node.CheckState); } catch (Exception ex) { MessageBox.Show(ex.Message); } } /// <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 SetCheckedParentNodes(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.Checked : check; SetCheckedParentNodes(node.ParentNode, check); } }
运行效果图:
第二种:AppendNode添加节点
代码如下:
private void LoadTree()
{
//清空节点
treeList1.BeginUnboundLoad();
treeList1.ClearNodes();
arrayList = new List<TreeListNode>();
//绑定部位树树的第一层
TreeListNode Node = treeList1.Nodes.Add(new object[] { "所有颜色", "*"});
Node.Tag = "*";
arrayList.Add(Node);
//绑定第二层
DataSet ds = SqlHelper.Query(@"select ctc.colorId as ParentNodeID,ctc.childcolorId as NodeID, cc.names as NodeName
from C_colorTocolor ctc(nolock)
inner join C_color cc(nolock) on ctc.childcolorId=cc.id");
if (ds != null && ds.Tables.Count > 0)
{
table = ds.Tables[0];
DataRow[] rows = table.Select("ParentNodeID='*'");
foreach (DataRow row in rows)
{
TreeListNode tn = treeList1.AppendNode(new object[] { row["NodeName"].ToString(), row["NodeID"].ToString() }, Node.Id);
tn.Tag = row["NodeID"].ToString();
arrayList.Add(tn);
BindNode(row["NodeID"].ToString(), tn);
}
}
treeList1.EndUnboundLoad();
treeList1.ExpandAll();
}
private void BindNode(string nodeId, TreeListNode tn)
{
DataRow[] rows = table.Select("ParentNodeID='" + nodeId + "'");
foreach (DataRow row in rows)
{
TreeListNode tns = treeList1.AppendNode(new object[] { row["NodeName"].ToString(), row["NodeID"].ToString()}, tn.Id);
tns.Tag = row["NodeID"].ToString();
arrayList.Add(tns);
BindNode(row["NodeID"].ToString(), tns);
}
}
private void Form2_Load(object sender, EventArgs e)
{
//绑定树
LoadTree();
}
运行效果图:
第三种:VirtualTreeGetChildNodes虚拟树加载。这种模式主要用于数据量过多，打开界面比较慢的情况。
private void Form3_Load(object sender, EventArgs e)
{
//初始化树
InitData();
}
bool isload = false;
void InitData()
{
isload = false;
treeList1.ClearNodes();
treeList1.DataSource = new object();
}
private void treeList1_VirtualTreeGetChildNodes(object sender, DevExpress.XtraTreeList.VirtualTreeGetChildNodesInfo e)
{
Cursor current = Cursor.Current;
Cursor.Current = Cursors.WaitCursor;
if (!isload)
{
List<O_node> roots = new List<O_node> { new O_node() { id= "*", names= "所有颜色",parentid="" } };
e.Children = roots;
isload = true;
}
else
{
try
{
O_node on = e.Node as O_node;
if(on!=null)
{
string sql = string.Format(@"select ctc.colorId as parentid,ctc.childcolorId as id, cc.names as names
from C_colorTocolor ctc(nolock)
inner join C_color cc(nolock) on ctc.childcolorId = cc.id
where ctc.colorId = '{0}'", on.id);
DataSet ds = SqlHelper.Query(sql);
if (ds != null && ds.Tables.Count > 0)
{
List<O_node> lst = (List<O_node>)DataTableToList<O_node>(ds.Tables[0]);
e.Children = lst;
}
else
{
e.Children = new object[] { };
}
}
else
{
e.Children = new object[] { };
}
}
catch
{
e.Children = new object[] { };
}
}
Cursor.Current = current;
}
private void treeList1_VirtualTreeGetCellValue(object sender, DevExpress.XtraTreeList.VirtualTreeGetCellValueInfo e)
{
string name = string.Empty;
if (e.Node is O_node)
{
name = (e.Node as O_node).names;
}
if (e.Column == treeListColumn1) e.CellData = name;
}
public static IList<T> DataTableToList<T>(DataTable table)
where T : class
{
if (!IsHaveRows(table))
return new List<T>();
IList<T> list = new List<T>();
T model = default(T);
foreach (DataRow dr in table.Rows)
{
model = Activator.CreateInstance<T>();
foreach (DataColumn dc in dr.Table.Columns)
{
object drValue = dr[dc.ColumnName];
PropertyInfo pi = model.GetType().GetProperty(dc.ColumnName);
if (pi != null && pi.CanWrite && (drValue != null && !Convert.IsDBNull(drValue)))
{
pi.SetValue(model, drValue, null);
}
}
list.Add(model);
}
return list;
}
/// <summary>
/// 检查DataTable 是否有数据行
/// </summary>
/// <param name="dt">DataTable</param>
/// <returns></returns>
public static bool IsHaveRows(DataTable dt)
{
if (dt != null && dt.Rows.Count > 0)
{
return true;
}
else
{
return false;
}
}
}
#region 节点
public class O_node
{
public string id { get; set; }
public string names { get; set; }
public string parentid { get; set; }
}
#endregion
运行效果图:
完整示例代码:https://download.csdn.net/download/u012026245/11986777
csdn现在资源积分上传时都是固定积分为5分了，如果需要完整代码的可以去下载一下。