extjs4 MVC2 TreePanel动态JSON实现

    var TreeStore = Ext.create('Ext.data.TreeStore', {
                proxy: {
                    type: 'ajax',
                    url: '<%= Url.Action("GetTreeJson", "WareHouseVoucherItem")%>'
                }
            });
            var TreeMater = Ext.create('Ext.tree.Panel', {
                title: '物资类型',
                region: 'west',
                store: TreeStore,
                rootVisible: false,
                cls: 'tree',
                height: 200,
                width: 200,
                dockedItems: [{
                    xtype: 'toolbar',
                    items: {
                    text: '选择确认', //
                    iconCls: 'x-ok',
                        handler: function() {
                            var records = TreeMater.getView().getChecked();

                            ids = [];
                            Ext.Array.each(records, function(rec) {
                                ids.push(rec.get('id'));
                            });

                            if (ids.length < 1) {
                                return null;
                            }
                            typeMaterialStore.load({
                                params: {
                                    TypeIds: ids
                                }
                            });
                        }
                    }
}]
                });

这段JS能在官方例子找到；

 [Serializable]
    public class GetJSON
    {
        public virtual long id { get; set; }

        public virtual string text { get; set; }

        public virtual string cls { get; set; }

        public virtual bool expanded { get; set; }
        
        public virtual IList<GetJSON> children { get; set; }
        
        public virtual bool leaf { get; set; }
        public virtual bool @checked { get; set; }


    }

上面类是用来封装ext Tree JSON的格式。遇到问题是，checked是C#关键字，而我要实现的是带复选框的Tree，用@符号 IList<GetJSON> list = new List<GetJSON>();

   public JsonResult GetTreeJson()
        {

             IList<GetJSON> list = new List<GetJSON>();

  IList<MaterialType> mTypes = MaterialTypeService.SelectAll();
for (int i = 0; i < mTypes.Count(); i++) { 
if (mTypes[i].ParentType == null)
  {
 GetJSON p = new GetJSON(); 
p.cls = "folder"; p.expanded = true;
 p.text = mTypes[i].MtName;
 p.id = mTypes[i].Id; list.Add(p);
 GetTreeNode(p, mTypes[i]); 
}
 }
 JsonResult jsons = this.Json(list, JsonRequestBehavior.AllowGet); 
return jsons;
 } 
/// <summary> ///
 /// </summary> 
/// <returns></returns> 
public void GetTreeNode(GetJSON p, MaterialType Ptype)
 {
IList<MaterialType> chiltype = new List<MaterialType>(); 
chiltype = this.MaterialTypeService.FindByPTypeId(Ptype);
 if (chiltype != null && chiltype.Count() != 0)
 { 
IList<GetJSON> childrens = new List<GetJSON>(); 
p.children = childrens; 
for (int i = 0; i < chiltype.Count(); i++) 
{ 
GetJSON cli = new GetJSON(); 
cli.text = chiltype[i].MtName; 
cli.@checked = false;
  cli.cls = "folder";
  cli.id = chiltype[i].Id; 
p.expanded = true; 
// cli.leaf = true; 
childrens.Add(cli);
  GetTreeNode(cli, chiltype[i]);
  } 
} else { 
p.text = Ptype.MtName; 
p.id = Ptype.Id;
  p.leaf = true;
  p.cls = "file";
  }
 }

<pre name="code" class="csharp">     <pre></pre></pre>

//MVC2很好的地方是可以自己封装JSON数据格式，我们只要把自己想要的属性加进去就OK.