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以下是一个使用AutoCAD C#.NET API实现你需求的示例代码，代码实现了提示用户选择一个实体，将一些字符串变量及其对应的值组成JSON格式数据存储到实体的扩展数据（XData）中，并在弹出窗口中显示该实体的所有扩展数据信息。

效果如下：

using Autodesk.AutoCAD.ApplicationServices;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Runtime;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;public class AcadXDataSample
{[Autodesk.AutoCAD.Runtime.CommandMethod("xx")]public void Josn设置XDATA(){Document doc = Application.DocumentManager.MdiActiveDocument;Database db = doc.Database;Editor ed = doc.Editor;// 提示用户选择一个实体PromptEntityOptions promptEntityOptions = new PromptEntityOptions("\n请选择一个实体: ");PromptEntityResult promptEntityResult = ed.GetEntity(promptEntityOptions);if (promptEntityResult.Status != PromptStatus.OK){return;}// 定义数据键值对Dictionary<string, string> dataDict = new Dictionary<string, string>{{ "权利人", "XX公司" },{ "性质", "集体" },{ "面积", "100㎡" },{ "联系电话", "66-6666" }};string jsonData = JsonConvert.SerializeObject(dataDict);string regAppName = "[土地登记卡]";// 注册应用程序名称（保持不变）using (Transaction trans = db.TransactionManager.StartTransaction()){RegAppTable regAppTable = trans.GetObject(db.RegAppTableId, OpenMode.ForRead) as RegAppTable;if (!regAppTable.Has(regAppName)){regAppTable.UpgradeOpen();RegAppTableRecord regAppRecord = new RegAppTableRecord();regAppRecord.Name = regAppName;regAppTable.Add(regAppRecord);trans.AddNewlyCreatedDBObject(regAppRecord, true);}trans.Commit();}// 写入XDatausing (Transaction trans = db.TransactionManager.StartTransaction()){try{Entity entity = trans.GetObject(promptEntityResult.ObjectId, OpenMode.ForWrite) as Entity;if (entity != null && !entity.IsErased && entity.IsWriteEnabled){ResultBuffer rb = new ResultBuffer(new TypedValue((int)DxfCode.ExtendedDataRegAppName, regAppName), // 组码1001new TypedValue((int)DxfCode.ExtendedDataAsciiString, jsonData)   // 组码1000);entity.XData = rb;trans.Commit();ed.WriteMessage("\n扩展数据已成功写入实体。");}else{MessageBox.Show("实体不可写或已被删除。");trans.Abort();}}catch (Exception ex){trans.Abort();MessageBox.Show($"存储扩展数据时出错: {ex.Message}");}}}[CommandMethod("xxx")]public void 显示XDATA(){Document doc = Application.DocumentManager.MdiActiveDocument;Database db = doc.Database;Editor ed = doc.Editor;PromptEntityOptions promptEntityOptions = new PromptEntityOptions("\n请选择一个实体: ");PromptEntityResult promptEntityResult = ed.GetEntity(promptEntityOptions);if (promptEntityResult.Status != PromptStatus.OK) return;using (Transaction trans = db.TransactionManager.StartTransaction()){try{Entity entity = trans.GetObject(promptEntityResult.ObjectId, OpenMode.ForRead) as Entity;if (entity != null && entity.XData != null){StringBuilder sb = new StringBuilder();//sb.AppendLine("实体的扩展数据信息:");foreach (TypedValue tv in entity.XData){// 处理（组码不是1000）的扩展数据if (tv.TypeCode != (int)DxfCode.ExtendedDataAsciiString){sb.AppendLine($"{tv.Value}\n");//sb.AppendLine($"类型码: {tv.TypeCode}, 原始值: {tv.Value}");}// 仅针对 ASCII 字符串（组码1000）尝试解析JSONif (tv.TypeCode == (int)DxfCode.ExtendedDataAsciiString){//sb.AppendLine($"类型码: {tv.TypeCode}");string stringValue = tv.Value.ToString();// 尝试解析JSONbool isJson = false;try{var dict = JsonConvert.DeserializeObject<Dictionary<string, string>>(stringValue);if (dict != null && dict.Count > 0){isJson = true;//sb.AppendLine("解析为JSON：");foreach (var item in dict){sb.AppendLine($"{item.Key}：{item.Value}");}}}catch { /* 忽略解析错误 */ }// 非JSON的纯文本直接显示if (!isJson){sb.AppendLine("文本内容：");sb.AppendLine($"  {stringValue}");}}}// 显示结果string result = sb.ToString();MessageBox.Show(result, "实体扩展数据信息");ed.WriteMessage("\n" + result);}trans.Commit();}catch (Exception ex){trans.Abort();string errorMsg = $"读取扩展数据时出错: {ex.Message}";MessageBox.Show(errorMsg);ed.WriteMessage("\n" + errorMsg);}}}[CommandMethod("scxx")]public void 删除XDATA(){}[CommandMethod("scsy")]public void 删除所有XDATA(){}
}