ASP.NET MVC异步获取和刷新ExtJS6 TreeStore

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从数据库获取构造树结构是ExtJS TreePanel的核心技术，常用方法是TreeStroe里配置proxy，这种方式的root成了一个不受控制的节点。

TreeStroe的root实际是一个层叠json数据，大部分情况是直接写一些简单数据，但在实际应用中必定是要从数据库读取的。我的方法是先用Ext.Ajax.request获取root数据形成TreeStroe。定义一个全局的TreeStroe名字是mTreeStore,用Ext.Ajax.request获得root数据。TreeStoreRefresh函数与此类似，将mTreeStore的root换为新值。TreePanel的rootVisible属性必须为true，增加一个节点单击事件显示节点的信息。

var mTreeStore = null;Ext.Ajax.request({  async: false,  url: '/api/BasicData_API/GetBasicTablesTreeSource',  method: 'get',  success: function (response, options)  {   var TreeRoot = Ext.decode(response.responseText);   mTreeStore = Ext.create('Ext.data.TreeStore',   {    root: TreeRoot   });  },  failure: function (response, options)  {   //var responseArray = Ext.decode(response.responseText);   Ext.Msg.alert('服务器错误', '数据处理错误原因:\n\r' + response.responseText);  }});function TreeStoreRefresh(){ Ext.Ajax.request({  async: false,  url: '/api/BasicData_API/GetBasicTablesTreeSource',  method: 'get',  success: function (response, options)  {   var TreeRoot = Ext.decode(response.responseText);   if (mTreeStore != null)   {    mTreeStore.setRoot(TreeRoot);   }  },  failure: function (response, options)  {   //var responseArray = Ext.decode(response.responseText);   Ext.Msg.alert('服务器错误', '数据处理错误原因:\n\r' + response.responseText);  } });}Ext.define('TreeToolbarCls', { extend: 'Ext.toolbar.Toolbar', padding:'0 0 0 0', items: [{  text: '刷新',  iconCls: 'refresh',  handler: TreeStoreRefresh,  height: 30,  width: 65 }]});Ext.define('U1TreeCls',{ extend: 'Ext.tree.Panel', xtype: 'U1Tree_xtype', //title: '基础数据字典', rootVisible: true, width: 300, store: mTreeStore, scrollable: true, tbar:Ext.create('TreeToolbarCls'), listeners: {  itemclick: NodeClick }});function NodeClick(node, record, item, index, e, eOpts){ if (typeof (record.data) == "undefined") {  return; } var message = Ext.String.format('Level={0}<br/>state={1}', record.data.Level, record.data.state); Ext.Msg.alert("节点信息", message);}

下面是后台C#代码

定义一个TreeNode类，包含TreePanel节点固有的一些属性，也可以任意扩充，利用这个可以自定义许多附加数据，如我在里面定义Level表示节点的级别。

 [Authorize] [RoutePrefix("api/BasicData_API")] public class BasicData_APIController : ApiController {  [Route("GetBasicTablesTreeSource")]  public HttpResponseMessage GetBasicTablesTreeSource(string condition = null)  {   List<TreeNode> lstF = new List<TreeNode>();   ZydAdonet z = ZydAdonet.Instance();   string s1 = "select TableName,title from BaseDataTables order by TableName";   string sqltext = s1;   DataTable dt1;   string ErrMes;   z.Sql2DTReadOnly(s1, out dt1, null, out ErrMes);   TreeNode tnd;   foreach (DataRow drx in dt1.Rows)   {    tnd = new TreeNode    {     id = drx["TableName"].ToString(),     text = drx["title"].ToString(),     Level = 1,     iconCls = "table_6",     state = drx["TableName"].ToString() + " OK",     leaf = true    };    lstF.Add(tnd);   }   TreeNode root = new TreeNode   {    text = "基础数据字典",    expanded = false,    iconCls = "folder_close",    Level = 0,    state = "RootOfTree",    leaf = true   };   if (lstF.Count > 0)   {    root.expanded = true;    root.leaf = false;    root.iconCls = "folder_open";    root.children = lstF;   }   string JsonStr;   JsonStr = JsonConvert.SerializeObject(root);   HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK, "value");   response.Content = new StringContent(JsonStr, Encoding.GetEncoding("UTF-8"), "application/json");   response.Headers.CacheControl = new CacheControlHeaderValue()   {    MaxAge = TimeSpan.FromMinutes(10)   };   return response;  } } internal class TreeNode {  public string id { get; set; }  public string text { get; set; }  public string iconCls { get; set; }  public string state { get; set; }  public bool leaf { get; set; }  public int Level { get; set; }  public bool expanded { get; set; }  public List<TreeNode> children { get; set; } }

在NodeClick函数中断可以监视到更多的信息：

最后的运行效果：

然后更改数据表里的数据，点“刷新”就实现了TreePanel节点的刷新。

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