.net开发中的支持树型的GridView控件

        重载:OnInit#region 重载:OnInit
        protected override void OnInit(EventArgs e)
        {
            base.OnInit(e);
            Page.RegisterRequiresPostBack(this);

            if (!Page.ClientScript.IsClientScriptIncludeRegistered("JS_TreeListView"))
            {
                this.Page.ClientScript.RegisterClientScriptInclude(this.GetType(), "JS_TreeListView", Page.ClientScript.GetWebResourceUrl(this.GetType(), "GoldMantis.Web.UI.Resource.TreeListView.JS_TreeListView.js"));
            }
        }
        #endregion

        IPostBackDataHandler Members#region IPostBackDataHandler Members

        public bool LoadPostData(string postDataKey, NameValueCollection postCollection)
        {
            return false;
        }

        public void RaisePostDataChangedEvent()
        {

        }

        #endregion

        方法:RenderCheckBoxExField#region 方法:RenderCheckBoxExField
        /**//// <summary>
        /// 处理CheckBoxExField类型的列
        /// </summary>
        private void RenderCheckBoxExField()
        {
            if (!this.ShowHeader && !this.ShowFooter)
            {
                return;
            }

            foreach (DataControlField field in Columns)
            {
                if (field is CheckBoxExField)
                {
                    int checkBoxExFieldIndex = Columns.IndexOf(field) + this.GetAutoGenerateButtonCount();
                    foreach (GridViewRow row in Rows)
                    {
                        if (row.RowType == DataControlRowType.Header)
                        {
                            row.Cells[checkBoxExFieldIndex].Controls.Clear();
                        }
                        if (row.RowType == DataControlRowType.DataRow)
                        {
                            row.Cells[checkBoxExFieldIndex].Controls[0].ID = "cbChoose";
                            ((CheckBox)row.Cells[checkBoxExFieldIndex].Controls[0]).Attributes.Add("onclick", "ChooseTree(this);");
                        }
                    }

                    注册脚本#region 注册脚本
                    string script = @"
    var modifyId = """" ;
    var choosedId = """";
    var choosedIndex;
    function ChooseTree(obj)
    {
        var cTrId = obj.parentElement.parentElement.parentElement.id;
        var treeTable = document.getElementById("""+this.ClientID+@""");
        for( var i = 0; i < treeTable.rows.length; i++ )
        {
            if( treeTable.rows[i].id.indexOf(cTrId) != -1 && treeTable.rows[i].id != cTrId )
            {
                document.getElementById(treeTable.rows[i].id+""_cbChoose"").checked = obj.checked;
            }
        }
        choosedId = """";
        choosedIndex = new Array();
        for( var i = 1; i < treeTable.rows.length; i++ )
        {
            if( document.getElementById(treeTable.rows[i].id+""_cbChoose"").checked )
            {
                choosedId += treeTable.rows[i].id.substring(treeTable.rows[i].id.lastIndexOf(""/"")+1) + "","";
                choosedIndex.push(i);
            }
        }
       
        choosedId = choosedId.substring(0,choosedId.length-1);
    }";
                    if (!Page.ClientScript.IsStartupScriptRegistered("TreeListView_CheckBoxExField"))
                    {
                        Page.ClientScript.RegisterStartupScript(GetType(), "TreeListView_CheckBoxExField", script, true);
                    }
                    #endregion
                }
            }
        }
        方法:GetAutoGenerateButtonCount#region 方法:GetAutoGenerateButtonCount
        private int GetAutoGenerateButtonCount()
        {
            int num = 0;
            if (this.AutoGenerateDeleteButton || this.AutoGenerateEditButton || this.AutoGenerateSelectButton)
            {
                num = 1;
            }
            return num;
        }
        #endregion
        #endregion

        protected override void Render(HtmlTextWriter writer)
        {
            RenderCheckBoxExField();
            base.Render(writer);
        }
    }

 public class TreeListViewRow : GridViewRow
    {
        public TreeListViewRow(int rowIndex, int dataItemIndex, DataControlRowType rowType, DataControlRowState rowState)
            : base(rowIndex, dataItemIndex, rowType, rowState)
        {

        }
       
        protected override void OnPreRender(EventArgs e)
        {
            base.OnPreRender(e);
            if (this.RowType == DataControlRowType.DataRow)
            {
                if (this.Parent.Parent is TreeListView)
                {
                    TreeListView treeListView = this.Parent.Parent as TreeListView;
                    DataRow dr = ((DataTable)treeListView.DataSource).Rows[this.DataItemIndex] as DataRow;
                    string str = GetTreeNodeImg(dr, Convert.ToBoolean(dr["TreeListView$Row$IsLeaf"]), Convert.ToBoolean(dr["TreeListView$Row$IsBottom"]));
                    this.Cells[treeListView.NodeColumnIndex].Text = str + this.Cells[treeListView.NodeColumnIndex].Text;
                    this.ID = dr["TreeList$ViewRow$ClientID"].ToString();
                    if (treeListView.ExpendDepth > 0)
                    {
                        this.Style["display"] = treeListView.ExpendDepth >= Convert.ToInt32(dr["TreeListView$Row$Depth"]) ? "block" : "none";
                    }
                }
            }
           
        }

        获取Tree的图片#region 获取Tree的图片
        string GetTreeNodeImg(DataRow dr, bool isLeaf, bool isBottom)
        {
            return GetTreeNodeOtherImg(dr) + GetTreeNodeLastImg(isLeaf, isBottom);
        }
        string GetTreeNodeOtherImg(DataRow dr)
        {
            if (dr["TreeListView$Row$ParentRow"] != null&&!dr["TreeListView$Row$ParentRow"].Equals(DBNull.Value))
            {
                DataRow drParentRow = dr["TreeListView$Row$ParentRow"] as DataRow;
                bool parentIsBottom = Convert.ToBoolean(drParentRow["TreeListView$Row$IsBottom"]);
                if (parentIsBottom)
                {
                    return GetTreeNodeOtherImg(drParentRow) + string.Format("<img src={0} align=absmiddle>", TreeListView.TreeImageFolder + "white.gif");
                }
                else
                {
                    return GetTreeNodeOtherImg(drParentRow) + string.Format("<img src={0} align=absmiddle>", TreeListView.TreeImageFolder + "i.gif");
                }

            }
            else
            {
                return string.Empty;
            }
        }
        string GetTreeNodeLastImg(bool isLeaf, bool isBottom)
        {
            //最后靠近的那个Image
            string lastImg = string.Empty;
            if (isLeaf)
            {
                if (isBottom)
                {
                    lastImg = string.Format("<img src={0} align=absmiddle>", TreeListView.TreeImageFolder + "l.gif");
                }
                else
                {
                    lastImg = string.Format("<img src={0} align=absmiddle>",TreeListView.TreeImageFolder + "t.gif");
                }
            }
            else
            {
                if (isBottom)
                {
                    lastImg = string.Format("<img src={0} align=absmiddle onclick='ClickNode(this,true,\"{1}\");' style=\"cursor: hand\">", TreeListView.TreeImageFolder + "lminus.gif", this.Parent.Parent.ClientID);
                }
                else
                {
                    lastImg = string.Format("<img src={0} align=absmiddle onclick='ClickNode(this,true,\"{1}\");' style=\"cursor: hand\">", TreeListView.TreeImageFolder + "tminus.gif", this.Parent.Parent.ClientID);
                }
            }
            return lastImg;

        }
        #endregion

var lExpend = "lminus.gif";
var lPinch = "lplus.gif";  
var tExpend = "tminus.gif";
var tPinch = "tplus.gif";        

function ClickNode(img,isBottom,tableId)
{
    var imgId = img.src.substring(img.src.lastIndexOf("/")+1);
    var url = img.src.substring(0,img.src.lastIndexOf("/")+1);
    var oldTrId = img.parentElement.parentElement.id;
    var newTrId = oldTrId.substring(oldTrId.indexOf("_")+1);
   
    if( isBottom)
    {
        if( imgId == lExpend)
        {
            img.src =  url+ lPinch;
            img.parentElement.id = lPinch;
            PinchNode(newTrId,oldTrId,tableId);
        }
        else
        {
            img.src = url + lExpend;
            img.parentElement.id = lExpend;
            ExpendNode(newTrId,oldTrId,tableId);
        }  
    }
    else
    {
        if( imgId == tExpend )
        {
            img.src =  url+ tPinch;
            img.parentElement.id = tPinch;
            PinchNode(newTrId,oldTrId,tableId);
     
        }
        else
        {
            img.src = url + tExpend;
            img.parentElement.id = tExpend;
            ExpendNode(newTrId,oldTrId,tableId);
        }  
    }
}

function ExpendNode(newId,oldId,tableId)
{
    var tree = document.getElementById(tableId);
    for( var i = 0; i < tree.rows.length; i++ )
    {
        if( tree.rows[i].id.indexOf(newId) != -1 && tree.rows[i].id != oldId )
        {
            var isExpend = true;
            var pId = tree.rows[i].id;
          
            while( pId != oldId)
            {
                for( var j = 0; j < 2; j++ )
                    pId = pId.substring( 0,pId.lastIndexOf("/"));
                var parent = document.getElementById(pId);
                if( parent != null )
                {
                    var tempId = parent.cells[2].id;
                    if( tempId == lExpend || tempId == tExpend || tempId == "")
                        ;
                    else
                    {
                        isExpend = false;
                        break;
                    }
                }
                else
                    break;
            }
            if( isExpend )
               tree.rows[i].style.display="block"; 
        }
    }
}

function PinchNode(newId,oldId,tableId)
{
    var tree = document.getElementById(tableId);
    for( var i = 0; i < tree.rows.length; i++ )
    {
        if( tree.rows[i].id.indexOf(newId) != -1 && tree.rows[i].id != oldId)
        {
            tree.rows[i].style.display = "none";
        }
    }
}