懒人，我给你发一个源码：
在 Page_Load(object sender, EventArgs e) 里面加入： TreeView1.Attributes.Add("onclick", "CheckEvent(event)");//TreeView1是你树控件的名称。下面的 javascript 放到 <head></head> 之间
<script type="text/javascript">
function CheckEvent(evt)
{
evt=window.event||evt;
var objNode = evt.srcElement||evt.target;
if(objNode.tagName == "INPUT" && objNode.type== "checkbox")
{
var objParentDiv = objNode.id.replace("CheckBox","Nodes");
if(objNode.checked==true)
{
setChildCheckState(objParentDiv,true);
setParentCheckeState(objNode,true);
}
else
{
setChildCheckState(objParentDiv,false);
if(!HasOtherChecked(objNode)){
setParentCheckeState(objNode,false);
}
}
}
}
//判断是否有并行的其他节点被选中
function HasOtherChecked(objNode)
{
var objParentDiv = WebForm_GetParentByTagName(objNode, "div");
var chks = objParentDiv.getElementsByTagName("INPUT");
for(var i=0;i<chks.length;i++){
if(chks[i].checked && chks[i].id != objNode.id)
{
return true;
}
}
return false;
}
//设置父节点
function setParentCheckeState(objNode,chkstate)
{
try{
var objParentDiv = WebForm_GetParentByTagName(objNode, "div");
if(objParentDiv == null || objParentDiv == "undefined "){
return;
}
else{
var objParentChkId = objParentDiv.id.replace("Nodes","CheckBox");
var objParentCheckBox = document.getElementById(objParentChkId);
if(objParentCheckBox){
objParentCheckBox.checked = chkstate;
setParentCheckeState(objParentDiv,chkstate);
}
}
}
catch(e){}
}
//设置子节点
function setChildCheckState(nodeid,chkstate)
{
var node = document.getElementById(nodeid);
if(node){
var chks = node.getElementsByTagName("INPUT");
for(var i=0;i<chks.length;i++){
chks[i].checked = chkstate;
}
}
}
</script>