学步园

下面有两种办法，是我从CSDN里找到的，拿来共享下
法一：
用JS我实现了的，没什么问题。记得在Page_load时间写
this.TreeView1.Attributes.Add("onclick",    "CheckEvent()");

JScript code
     //获取元素指定tagName的父元素
function public_GetParentByTagName(element, tagName)
{
          var parent = element.parentNode;
          var upperTagName = tagName.toUpperCase();
          //如果这个元素还不是想要的tag就继续上溯
          while (parent && (parent.tagName.toUpperCase() != upperTagName))
          {
              parent = parent.parentNode ? parent.parentNode : parent.parentElement;
          }
          return parent;
}

//设置节点的父节点Cheched——该节点可访问，则他的父节点也必能访问
function setParentChecked(objNode)
{
          var objParentDiv = public_GetParentByTagName(objNode,"div");
          if(objParentDiv==null ¦ ¦ objParentDiv == "undefined")
          {
              return;
          }
          var objID = objParentDiv.getAttribute("ID");
          objID = objID.substring(0,objID.indexOf("Nodes"));
          objID = objID+"CheckBox";
          var objParentCheckBox = document.getElementById(objID);
          if(objParentCheckBox==null ¦ ¦ objParentCheckBox == "undefined")
          {
              return;
          }
          if(objParentCheckBox.tagName!="INPUT" && objParentCheckBox.type == "checkbox")
          return;
          objParentCheckBox.checked = true;
          setParentChecked(objParentCheckBox);
}

//设置节点的子节点uncheched——该节点不可访问，则他的子节点也不能访问
function setChildUnChecked(divID)
{
          var objchild = divID.children;
          var count = objchild.length;
          for(var i=0;i <objchild.length;i++)
          {
              var tempObj = objchild[i];
              if(tempObj.tagName=="INPUT" && tempObj.type == "checkbox")
              {
                  tempObj.checked = false;
              }
              setChildUnChecked(tempObj);
          }
}

//设置节点的子节点cheched——该节点可以访问，则他的子节点也都能访问
function setChildChecked(divID)
{
          var objchild = divID.children;
          var count = objchild.length;
          for(var i=0;i <objchild.length;i++)
          {
              var tempObj = objchild[i];
              if(tempObj.tagName=="INPUT" && tempObj.type == "checkbox")
              {
                  tempObj.checked = true;
              }
              setChildChecked(tempObj);
          }
}

//触发事件
function CheckEvent()
{

          var objNode = event.srcElement;

          if(objNode.tagName!="INPUT" ¦ ¦ objNode.type!="checkbox")
          return;

          if(objNode.checked==true)
          {
              setParentChecked(objNode);
              var objID = objNode.getAttribute("ID");
              var objID = objID.substring(0,objID.indexOf("CheckBox"));
              var objParentDiv = document.getElementById(objID+"Nodes");
              if(objParentDiv==null ¦ ¦ objParentDiv == "undefined")
              {
                  return;
              }
              setChildChecked(objParentDiv);
          }
          else
          {
              var objID = objNode.getAttribute("ID");
              var objID = objID.substring(0,objID.indexOf("CheckBox"));
              var objParentDiv = document.getElementById(objID+"Nodes");
              if(objParentDiv==null ¦ ¦ objParentDiv == "undefined")
              {
                  return;
              }
              setChildUnChecked(objParentDiv);
          }
}

法二：

//全选TreeView
function client_OnTreeNodeChecked()
{
var obj = window.event.srcElement;
var treeNodeFound = false;
var checkedState;
if (obj.tagName == "INPUT" && obj.type == "checkbox")
    {
var treeNode = obj;
        checkedState = treeNode.checked;
do
        {
            obj = obj.parentElement;
        } while (obj.tagName != "TABLE")
var parentTreeLevel = obj.rows[0].cells.length;
var parentTreeNode = obj.rows[0].cells[0];
var tables = obj.parentElement.getElementsByTagName("TABLE");
var numTables = tables.length
if (numTables >= 1)
        {
for (i=0; i < numTables; i++)
            {
if (tables[i] == obj)
                {
                    treeNodeFound = true;
                     i++;
if (i == numTables)
                    {
return;
                    }
            }
if (treeNodeFound == true)
            {
var childTreeLevel = tables[i].rows[0].cells.length;
if (childTreeLevel > parentTreeLevel)
                {
var cell = tables[i].rows[0].cells[childTreeLevel - 1];
var inputs = cell.getElementsByTagName("INPUT");
                    inputs[0].checked = checkedState;
                }
else
                {
return;
                }
            }
        }
    }
    }
}

<asp:TreeView ID="TreeView1" runat="server" ShowCheckBoxes="All" ShowLines="True"   onclick='client_OnTreeNodeChecked()' >
</asp:TreeView>
两种方法我都试了，完全可以做到！
另，有位朋友用C#做了个自定义控件，是TreeView 的，有人感兴趣的话，就留言给我吧，我可以发源程序！