研究了两天，网上也看了不少资料，但都是静态绑定到TreeList，就是在已知道表的情况下进行绑定，表中已经把KeyFieldName和ParentFieldName的关系确定好了，比较死板。我需要的功能是自动根据XML进行确定KeyFieldName和ParentFieldName关系。所以确定二者关系就比较麻烦，我现在只能实现对三层的XML文件进行显示，四层的还会出错，正在进一步改进，记录如下：（草稿形式，不很规范，谅解）

private void btnOpenFile_Click(object sender,EventArgs e)
{
OpenFileDialog openFile = new OpenFileDialog();
openFile.Title = "打开XML文件";
openFile.Filter = "XML文件(*.xml)|*.xml";
openFile.InitialDirectory = "C:\\";
openFile.ShowDialog();
string filepath = openFile.FileName;
this.treeList1.DataSource = SelectXml(filepath);

}

public static int parentId;
public static int Id;
private DataTable SelectXml(string xmlPath)
{
DataTable dt = new DataTable();
DataColumn did = new DataColumn("ID",Type.GetType("System.Int32"));
DataColumn dParentID = new DataColumn("ParentID",Type.GetType("System.Int32"));
DataColumn dNodeName = new DataColumn("节点名称",Type.GetType("System.String"));
dt.Columns.Add(did);
dt.Columns.Add(dParentID);
dt.Columns.Add(dNodeName);
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(xmlPath);
//初始ID,ParentID
Id = 1;
parentId = 1;
//获取根节点
XmlElement xmlRootElement = xmlDoc.DocumentElement;
DataRow dr = dt.NewRow();
dr["ID"] = Id;
dr["ParentID"] = 0;
dr["节点名称"] = xmlRootElement.Name.ToString();
dt.Rows.Add(dr);
Id++;
int Id1 = Id,pId;
int b = parentId,d = Id; //记录递归后的ID，ParentId变化
XmlNodeList xmlNodeList = xmlRootElement.ChildNodes;
foreach (XmlElement xmlElement in xmlNodeList)
{
XmlNode xmlnode = (XmlNode)xmlElement;
dr = dt.NewRow();
dr["ID"] =d;
dr["ParentID"] = parentId;
dr["节点名称"] = xmlnode.Name.ToString();
dt.Rows.Add(dr);
Id1 = d;
pId = b+1;
sort(xmlnode,Id1,pId,dt,ref d,ref b); //利用ref记录随时变化
}
return dt;
}

private void sort(XmlNode xmlnode,int ID,int parentId,DataTable dt,ref int d,ref int b) { if (xmlnode.HasChildNodes) { XmlNodeList ChildNodeList = xmlnode.ChildNodes; foreach (XmlNode xmlNode in ChildNodeList) { if (xmlNode.NodeType == XmlNodeType.Text) { Id = Id - 1; ID = ID + 1; continue; } else { ID = ID + 1; DataRow dr = dt.NewRow(); dr["ID"] = ID; dr["ParentID"] = parentId; dr["节点名称"] = xmlNode.Name.ToString(); Id = Id + 1; dt.Rows.Add(dr); sort(xmlNode,ID,Id - 1,ref b); } } } d=ID+1; b = ID; }