自己接觸EXT已經有三個來月了，學習了不少的東西。在這裡把一些接觸到的東西記錄下來，算是再熟悉一次。

 下面這個類裡面的方法是相關的把DataTable中的資料轉換成JSON格式的方法，把樹TreeNode轉換成JSON格式的方法，如下：

using System.Data; using System.Web.UI.WebControls; using System.Text; public class JsonHelper { public JsonHelper() { } /// <summary> /// 將TreeNode陣列中的每一個節點及其全部子節點轉換為Json格式字串 /// </summary> /// <param name="nodes"></param> /// <returns></returns> public static string GetJSTreeJSONData(TreeNodeCollection nodes) { StringBuilder treeString = new StringBuilder(); //構建JSON開頭 treeString.Append("["); for (int i = 0; i < nodes.Count; i++) { //如果有子節點,則進行子節點構建 if (nodes[i].ChildNodes.Count != 0) { treeString.Append("{ attributes: {pk_id: '" + nodes[i].Value + "'}, text:'" + nodes[i].Text + "',expanded: false"); RecurrenceBuildJSTreeJSONData(treeString, nodes[i]); } else { treeString.Append("{ attributes: {pk_id: '" + nodes[i].Value + "'}, text:'" + nodes[i].Text + "',leaf: true"); } //構建節點結尾 treeString.Append("}"); if (i != nodes.Count - 1) { treeString.Append(","); } } treeString.Append("]"); return treeString.ToString(); } /// <summary> /// 將單個節點及其所有子節點轉換為Json格式字串 /// </summary> /// <param name="nodes"></param> /// <returns></returns> public static string GetJSTreeJSONData(TreeNode nodes) { StringBuilder treeString = new StringBuilder(); //構建JSON開頭 treeString.Append("["); //構建節點 treeString.Append("{ attributes: {pk_id: '" + nodes.Value + "'}, text:'" + nodes.Text + "',expanded: false"); //如果有子節點,則進行子節點構建 if (nodes.ChildNodes.Count != 0) { RecurrenceBuildJSTreeJSONData(treeString, nodes); } //構建節點結尾 treeString.Append("}"); //構建JSON結尾 treeString.Append("]"); return treeString.ToString(); } private static void RecurrenceBuildJSTreeJSONData(StringBuilder treeString, TreeNode nodes) { //構建子節點開頭 treeString.Append(",children: ["); for (int i = 0; i < nodes.ChildNodes.Count; i++) { treeString.Append("{ attributes: {pk_id: '" + nodes.ChildNodes[i].Value + "',parent_id:'" + nodes.Value + "'}, text:'" + nodes.ChildNodes[i].Text + "'"); if (nodes.ChildNodes[i].ChildNodes.Count != 0) RecurrenceBuildJSTreeJSONData(treeString, nodes.ChildNodes[i]); else treeString.Append(",leaf:true"); //構建最後一條節點的結尾 if (i == nodes.ChildNodes.Count - 1) treeString.Append("}"); //構建非最後一條節點的結尾 else treeString.Append("},"); } //構建子節點結尾 treeString.Append("]"); } /// <summary> /// 轉換異常資訊為同一的Json資料格式 /// </summary> /// <param name="msg"></param> /// <returns></returns> public static string GetErrorJson(string msg) { if (msg.IndexOf("/n") > 0) { msg = msg.Substring(0, msg.IndexOf("/n")); } return "err:{msg:'" + msg + "'}"; } /// <summary> /// 將DataTable資料轉換為Json表格資料格式 /// </summary> /// <param name="dt"></param> /// <returns></returns> public static string GetTableJson(DataTable dt) { //資料樣式 string data = "data:["; if (dt != null && dt.Rows.Count > 0) { foreach (DataRow row in dt.Rows) { data += "{"; foreach (DataColumn column in dt.Columns) { data += column.ColumnName + ":'" + row[column].ToString() + "',"; } data = data.Substring(0, data.Length - 1); data += "},"; } data = data.Substring(0, data.Length - 1); } data += "]"; return data; } }

以後所有的涉及的相關操作都要根據這個公共類的方法進行。