关于自定义组件的问题

Question

我想用ascx写一个组件,组件上有一个textbox和一个treeview,功能是当选择treeview的结点后,结点的值赋给textbox和这个组件的一个属性,赋值操作是做在treeview的SelectedNodeChanged事件中.
问题是:当我在测试页中调用该组件的属性时,得不到treeview选择的结点的值
代码如下:
namespace myControl
{
    public partial class orgSelect : System.Web.UI.UserControl
    {
        ERPDBoper dboper = new ERPDBoper();
        String org_id;
        String org_Name;
        public String orgID
        {
            set
            {
                org_id = value;
            }
            get
            {
                if (org_id != null)
                    return org_id;
                else return "";
            }
        }
        public String orgName
        {
            set
            {
                org_Name = value;
            }
            get
            {
                if (org_Name != null)
                    return org_Name;
                else return "";
            }
        }
        protected void Page_Load(object sender, EventArgs e)
        {
            bindTree();
            if (Session["org_id"] != null && Session["org_Name"] != null)
            {
                org_id = Session["org_id"].ToString();
                org_Name = Session["org_Name"].ToString();
            }
        }
        public void bindTree()
        {
            DataSet tempds = new DataSet();
            String sql = "select * from OR_ORGANIZATIONS";
            tempds = dboper.getBinding(sql, "tb");        }
        protected void trvOrg_SelectedNodeChanged(object sender, EventArgs e)
        {
            txtbOrgID.Text = trvOrg.SelectedNode.Text.ToString();
            txtbOrgName.Text = trvOrg.SelectedNode.Value.ToString();
            //org_id = trvOrg.SelectedNode.Text.ToString();
            //org_Name = trvOrg.SelectedNode.Value.ToString();
            Session["org_id"] = trvOrg.SelectedNode.Text.ToString();
            Session["org_Name"] = trvOrg.SelectedNode.Value.ToString();
        }
    }
    public class myNode : System.Web.UI.WebControls.TreeNode
    {
        public String orgID;
        public String orgName;
        public myNode(String id, String Name)
        {
            orgID = id;
            orgName = Name;
        }
        public String ID
        {
            set
            {
                orgID = value;
            }
            get
            {
                return orgID;
            }
        }
        public String Name
        {
            set
            {
                orgName = value;
            }
            get
            {
                return orgName;
            }
        }
    }
}

Answer 1

问题刚得到初步解决,但是出现了新的问题,每次取到的值是treeview上一次
选择的结点值,不是当前选的结点值
代码如下:
namespace myControl
{
    public partial class orgSelect : System.Web.UI.UserControl
    {
        ERPDBoper dboper = new ERPDBoper();
        String org_id;
        String org_Name;
        public String orgID
        {
            set
            {
                ViewState["orgID"] = value;
            }
            get
            {
                if (ViewState["orgID"] != null)
                    return (String)ViewState["orgID"];
                else return "";
            }
        }
        public String orgName
        {
            set
            {
                ViewState["orgID"] = value;
            }
            get
            {
                if (ViewState["orgID"] != null)
                    return (String)ViewState["orgID"];
                else return "";
            }
        }
        protected void Page_Load(object sender, EventArgs e)
        {
            bindTree();            
        }
        public void bindTree()
        {
            DataSet tempds = new DataSet();
            String sql = "select * from OR_ORGANIZATIONS";
            tempds = dboper.getBinding(sql, "tb");        }
        protected void trvOrg_SelectedNodeChanged(object sender, EventArgs e)
        {
            txtbOrgID.Text = trvOrg.SelectedNode.Text.ToString();
            txtbOrgName.Text = trvOrg.SelectedNode.Value.ToString();
           
            this.orgID = trvOrg.SelectedNode.Text.ToString();
            this.orgName = trvOrg.SelectedNode.Value.ToString();
        }
    }
    public class myNode : System.Web.UI.WebControls.TreeNode
    {
        public String orgID;
        public String orgName;
        public myNode(String id, String Name)
        {
            orgID = id;
            orgName = Name;
        }
        public String ID
        {
            set
            {
                orgID = value;
            }
            get
            {
                return orgID;
            }
        }
        public String Name
        {
            set
            {
                orgName = value;
            }
            get
            {
                return orgName;
            }
        }
    }
}

Answer 2

  protected   void   Page_Load(object   sender,   EventArgs   e) 
                { 
                      if(!ispostback)//这句话估计是你忘记了
                      {
                        bindTree();    
                       ]                     
                }