diff --git a/OrderSupportTicket/Models/Api/WorkOrderContracts.cs b/OrderSupportTicket/Models/Api/WorkOrderContracts.cs
index 3fc6678..e2ee8b9 100644
--- a/OrderSupportTicket/Models/Api/WorkOrderContracts.cs
+++ b/OrderSupportTicket/Models/Api/WorkOrderContracts.cs
@@ -1,549 +1,536 @@
 using System.Collections.Generic;
-using System.Runtime.Serialization;
+using Newtonsoft.Json;
 
 namespace OrderSupportTicket.Models.Api;
 
 /// <summary>
 /// 创建工单请求。
 /// </summary>
-[DataContract]
 internal sealed class CreateWorkOrderRequest
 {
     /// <summary>
     /// 拍单账号。
     /// </summary>
-    [DataMember(Name = "purchaseAccount")]
+    ////[JsonProperty("purchaseAccount")]
     public string PurchaseAccount { get; set; }
 
     /// <summary>
     /// 订单所属店铺 APPID。
     /// </summary>
-    [DataMember(Name = "appId")]
+    ////[JsonProperty("appId")]
     public string AppId { get; set; }
 
     /// <summary>
     /// 微信订单号，保持为数字字符串。
     /// </summary>
-    [DataMember(Name = "wechatOrderId")]
+    ////[JsonProperty("wechatOrderId")]
     public string WechatOrderId { get; set; }
 
     /// <summary>
     /// 首条问题描述，长度 1～2000 字。
     /// </summary>
-    [DataMember(Name = "description")]
+    ////[JsonProperty("description")]
     public string Description { get; set; }
 
     /// <summary>
     /// 可选的创建幂等编号。
     /// </summary>
-    [DataMember(Name = "clientRequestId", EmitDefaultValue = false)]
+    ////[JsonProperty("clientRequestId", NullValueHandling = NullValueHandling.Ignore)]
     public string ClientRequestId { get; set; }
 }
 
 /// <summary>
 /// 工单摘要列表请求。
 /// </summary>
-[DataContract]
 internal sealed class ListWorkOrdersRequest
 {
     /// <summary>
     /// 拍单账号。
     /// </summary>
-    [DataMember(Name = "purchaseAccount")]
+    ////[JsonProperty("purchaseAccount")]
     public string PurchaseAccount { get; set; }
 
     /// <summary>
     /// 要查询的店铺 APPID 数组。
     /// </summary>
-    [DataMember(Name = "appIds")]
+    ////[JsonProperty("appIds")]
     public IList<string> AppIds { get; set; }
 
     /// <summary>
     /// 可选的微信订单号精确筛选条件。
     /// </summary>
-    [DataMember(Name = "wechatOrderId", EmitDefaultValue = false)]
+    ////[JsonProperty("wechatOrderId", NullValueHandling = NullValueHandling.Ignore)]
     public string WechatOrderId { get; set; }
 
     /// <summary>
     /// 可选的工单状态筛选条件。
     /// </summary>
-    [DataMember(Name = "status", EmitDefaultValue = false)]
+    ////[JsonProperty("status", NullValueHandling = NullValueHandling.Ignore)]
     public string Status { get; set; }
 
     /// <summary>
     /// 本页最大返回数量，范围 1～100。
     /// </summary>
-    [DataMember(Name = "limit")]
+    ////[JsonProperty("limit")]
     public int Limit { get; set; }
 
     /// <summary>
     /// 下一页游标，使用服务端返回的原始值。
     /// </summary>
-    [DataMember(Name = "cursor", EmitDefaultValue = false)]
+    ////[JsonProperty("cursor", NullValueHandling = NullValueHandling.Ignore)]
     public string Cursor { get; set; }
 }
 
 /// <summary>
 /// 查询订单留言板请求。
 /// </summary>
-[DataContract]
 internal sealed class GetMessagesRequest
 {
     /// <summary>
     /// 拍单账号。
     /// </summary>
-    [DataMember(Name = "purchaseAccount")]
+    ////[JsonProperty("purchaseAccount")]
     public string PurchaseAccount { get; set; }
 	/// <summary>
 	/// 微信订单号，保持为数字字符串。
 	/// </summary>
-	[DataMember(Name = "wechatOrderId")]
+	////[JsonProperty("wechatOrderId")]
 	public string WechatOrderId { get; set; }
 	/// <summary>
 	/// 订单所属店铺 APPID。
 	/// </summary>
-	[DataMember(Name = "appId")]
+	////[JsonProperty("appId")]
     public string AppId { get; set; }
 
     /// <summary>
     /// 本页最大返回数量，范围 1～100。
     /// </summary>
-    [DataMember(Name = "limit")]
+    ////[JsonProperty("limit")]
     public int Limit { get; set; }
 
     /// <summary>
     /// 加载更早留言时使用的 before 游标。
     /// </summary>
-    [DataMember(Name = "before", EmitDefaultValue = false)]
+    ////[JsonProperty("before", NullValueHandling = NullValueHandling.Ignore)]
     public string Before { get; set; }
 }
 
 /// <summary>
 /// 提交客户留言请求。
 /// </summary>
-[DataContract]
 internal sealed class SendMessageRequest
 {
     /// <summary>
     /// 拍单账号。
     /// </summary>
-    [DataMember(Name = "purchaseAccount")]
+    ////[JsonProperty("purchaseAccount")]
     public string PurchaseAccount { get; set; }
 
     /// <summary>
     /// 订单所属店铺 APPID。
     /// </summary>
-    [DataMember(Name = "appId")]
+    ////[JsonProperty("appId")]
     public string AppId { get; set; }
 
     /// <summary>
     /// 留言幂等编号。
     /// </summary>
-    [DataMember(Name = "clientMessageId")]
+    ////[JsonProperty("clientMessageId")]
     public string ClientMessageId { get; set; }
 
     /// <summary>
     /// 留言正文，长度 1～4000 字。
     /// </summary>
-    [DataMember(Name = "text")]
+    ////[JsonProperty("text")]
     public string Text { get; set; }
 }
 
 /// <summary>
 /// 标记留言已读请求。
 /// </summary>
-[DataContract]
 internal sealed class MarkReadRequest
 {
     /// <summary>
     /// 拍单账号。
     /// </summary>
-    [DataMember(Name = "purchaseAccount")]
+    ////[JsonProperty("purchaseAccount")]
     public string PurchaseAccount { get; set; }
 
     /// <summary>
     /// 订单所属店铺 APPID。
     /// </summary>
-    [DataMember(Name = "appId")]
+    ////[JsonProperty("appId")]
     public string AppId { get; set; }
 
     /// <summary>
     /// 已读到的最大留言序号。
     /// </summary>
-    [DataMember(Name = "throughSequenceNo")]
+    ////[JsonProperty("throughSequenceNo")]
     public int ThroughSequenceNo { get; set; }
 }
 
 /// <summary>
 /// 工单摘要分页响应。
 /// </summary>
-[DataContract]
 public sealed class WorkOrderListResponse
 {
     /// <summary>
     /// 请求是否成功。
     /// </summary>
-    [DataMember(Name = "success")]
+    ////[JsonProperty("success")]
     public bool Success { get; set; }
 
     /// <summary>
     /// 当前页工单摘要。
     /// </summary>
-    [DataMember(Name = "items")]
+    ////[JsonProperty("items")]
     public List<WorkOrderSummaryDto> Items { get; set; }
 
     /// <summary>
     /// 是否还有下一页。
     /// </summary>
-    [DataMember(Name = "hasMore")]
+    ////[JsonProperty("hasMore")]
     public bool HasMore { get; set; }
 
     /// <summary>
     /// 下一页游标。
     /// </summary>
-    [DataMember(Name = "nextCursor")]
+    ////[JsonProperty("nextCursor")]
     public string NextCursor { get; set; }
 
     /// <summary>
     /// 接口返回的身份校验标记，当前恒为 false。
     /// </summary>
-    [DataMember(Name = "identityVerified")]
+    ////[JsonProperty("identityVerified")]
     public bool IdentityVerified { get; set; }
 }
 
 /// <summary>
 /// 单个订单的工单摘要。
 /// </summary>
-[DataContract]
 public sealed class WorkOrderSummaryDto
 {
     /// <summary>
     /// 订单所属店铺 APPID。
     /// </summary>
-    [DataMember(Name = "appId")]
+    ////[JsonProperty("appId")]
     public string AppId { get; set; }
 
     /// <summary>
     /// 微信订单号，保持为数字字符串。
     /// </summary>
-    [DataMember(Name = "wechatOrderId")]
+    ////[JsonProperty("wechatOrderId")]
     public string WechatOrderId { get; set; }
 
     /// <summary>
     /// 工单状态编码。
     /// </summary>
-    [DataMember(Name = "status")]
+    ////[JsonProperty("status")]
     public string Status { get; set; }
 
     /// <summary>
     /// 工单状态中文文本。
     /// </summary>
-    [DataMember(Name = "statusText")]
+    ////[JsonProperty("statusText")]
     public string StatusText { get; set; }
 
     /// <summary>
     /// 工单创建时间，由接口以 ISO 8601 字符串传输。
     /// </summary>
-    [DataMember(Name = "createdAt")]
+    ////[JsonProperty("createdAt")]
     public string CreatedAt { get; set; }
 
     /// <summary>
     /// 工单更新时间，由接口以 ISO 8601 字符串传输。
     /// </summary>
-    [DataMember(Name = "updatedAt")]
+    ////[JsonProperty("updatedAt")]
     public string UpdatedAt { get; set; }
 
     /// <summary>
     /// 最近一条公开留言时间，由接口以 ISO 8601 字符串传输。
     /// </summary>
-    [DataMember(Name = "lastMessageAt")]
+    ////[JsonProperty("lastMessageAt")]
     public string LastMessageAt { get; set; }
 
     /// <summary>
     /// 最近一次客服正式回复时间；从未回复时为 null。
     /// </summary>
-    [DataMember(Name = "lastReplyAt")]
+    ////[JsonProperty("lastReplyAt")]
     public string LastReplyAt { get; set; }
 
     /// <summary>
     /// 最近一条公开留言的发送方类型。
     /// </summary>
-    [DataMember(Name = "lastSenderType")]
+    ////[JsonProperty("lastSenderType")]
     public string LastSenderType { get; set; }
 
     /// <summary>
     /// 未读留言数量。
     /// </summary>
-    [DataMember(Name = "unreadCount")]
+    ////[JsonProperty("unreadCount")]
     public int UnreadCount { get; set; }
 
     /// <summary>
     /// 工单版本号，按接口返回的字符串原样保存。
     /// </summary>
-    [DataMember(Name = "version")]
+    ////[JsonProperty("version")]
     public string Version { get; set; }
 }
 
 /// <summary>
 /// 订单留言板响应。
 /// </summary>
-[DataContract]
 public sealed class WorkOrderMessagesResponse
 {
     /// <summary>
     /// 请求是否成功。
     /// </summary>
-    [DataMember(Name = "success")]
+    ////[JsonProperty("success")]
     public bool Success { get; set; }
 
     /// <summary>
     /// 订单所属店铺 APPID。
     /// </summary>
-    [DataMember(Name = "appId")]
+    ////[JsonProperty("appId")]
     public string AppId { get; set; }
 
     /// <summary>
     /// 微信订单号。
     /// </summary>
-    [DataMember(Name = "wechatOrderId")]
+    ////[JsonProperty("wechatOrderId")]
     public string WechatOrderId { get; set; }
 
     /// <summary>
     /// 当前页公开留言，按 sequenceNo 升序排列。
     /// </summary>
-    [DataMember(Name = "items")]
+    ////[JsonProperty("items")]
     public List<TicketMessageDto> Items { get; set; }
 
     /// <summary>
     /// 是否还有更早的留言。
     /// </summary>
-    [DataMember(Name = "hasMore")]
+    ////[JsonProperty("hasMore")]
     public bool HasMore { get; set; }
 
     /// <summary>
     /// 加载更早留言时使用的 before 游标。
     /// </summary>
-    [DataMember(Name = "nextBefore")]
+    ////[JsonProperty("nextBefore")]
     public string NextBefore { get; set; }
 
     /// <summary>
     /// 接口返回的身份校验标记，当前恒为 false。
     /// </summary>
-    [DataMember(Name = "identityVerified")]
+    ////[JsonProperty("identityVerified")]
     public bool IdentityVerified { get; set; }
 }
 
 /// <summary>
 /// 单条公开留言。
 /// </summary>
-[DataContract]
 public sealed class TicketMessageDto
 {
     /// <summary>
     /// 消息唯一 ID，用于去重。
     /// </summary>
-    [DataMember(Name = "messageId")]
+    ////[JsonProperty("messageId")]
     public string MessageId { get; set; }
 
     /// <summary>
     /// 工单内连续递增的消息序号。
     /// </summary>
-    [DataMember(Name = "sequenceNo")]
+    ////[JsonProperty("sequenceNo")]
     public int SequenceNo { get; set; }
 
     /// <summary>
     /// 发送方类型，例如 customer。
     /// </summary>
-    [DataMember(Name = "senderType")]
+    ////[JsonProperty("senderType")]
     public string SenderType { get; set; }
 
     /// <summary>
     /// 发送方显示名称。
     /// </summary>
-    [DataMember(Name = "senderName")]
+    ////[JsonProperty("senderName")]
     public string SenderName { get; set; }
 
     /// <summary>
     /// 留言正文；消息撤回后为空字符串。
     /// </summary>
-    [DataMember(Name = "text")]
+    ////[JsonProperty("text")]
     public string Text { get; set; }
 
     /// <summary>
     /// 消息是否已撤回。
     /// </summary>
-    [DataMember(Name = "recalled")]
+    ////[JsonProperty("recalled")]
     public bool Recalled { get; set; }
 
     /// <summary>
     /// 消息发送时间，由接口以 ISO 8601 字符串传输。
     /// </summary>
-    [DataMember(Name = "createdAt")]
+    ////[JsonProperty("createdAt")]
     public string CreatedAt { get; set; }
 }
 
 /// <summary>
 /// 创建工单响应。
 /// </summary>
-[DataContract]
 public sealed class CreateWorkOrderResponse
 {
     /// <summary>
     /// 请求是否成功。
     /// </summary>
-    [DataMember(Name = "success")]
+    ////[JsonProperty("success")]
     public bool Success { get; set; }
 
     /// <summary>
     /// 创建结果，取值 created、existing 或 reopened。
     /// </summary>
-    [DataMember(Name = "operation")]
+    ////[JsonProperty("operation")]
     public string Operation { get; set; }
 
     /// <summary>
     /// 订单所属店铺 APPID。
     /// </summary>
-    [DataMember(Name = "appId")]
+    ////[JsonProperty("appId")]
     public string AppId { get; set; }
 
     /// <summary>
     /// 微信订单号。
     /// </summary>
-    [DataMember(Name = "wechatOrderId")]
+    ////[JsonProperty("wechatOrderId")]
     public string WechatOrderId { get; set; }
 
     /// <summary>
     /// 操作后的工单状态。
     /// </summary>
-    [DataMember(Name = "status")]
+    ////[JsonProperty("status")]
     public string Status { get; set; }
 
     /// <summary>
     /// 创建或重开时追加的首条消息 ID。
     /// </summary>
-    [DataMember(Name = "messageId")]
+    ////[JsonProperty("messageId")]
     public string MessageId { get; set; }
 
     /// <summary>
     /// 操作后的工单版本号字符串。
     /// </summary>
-    [DataMember(Name = "version")]
+    ////[JsonProperty("version")]
     public string Version { get; set; }
 
     /// <summary>
     /// 是否为幂等编号对应的历史回执。
     /// </summary>
-    [DataMember(Name = "replayed")]
+    ////[JsonProperty("replayed")]
     public bool Replayed { get; set; }
 
     /// <summary>
     /// 接口返回的身份校验标记，当前恒为 false。
     /// </summary>
-    [DataMember(Name = "identityVerified")]
+    ////[JsonProperty("identityVerified")]
     public bool IdentityVerified { get; set; }
 }
 
 /// <summary>
 /// 提交客户留言响应。
 /// </summary>
-[DataContract]
 public sealed class SendMessageResponse
 {
     /// <summary>
     /// 请求是否成功。
     /// </summary>
-    [DataMember(Name = "success")]
+    ////[JsonProperty("success")]
     public bool Success { get; set; }
 
     /// <summary>
     /// 订单所属店铺 APPID。
     /// </summary>
-    [DataMember(Name = "appId")]
+    ////[JsonProperty("appId")]
     public string AppId { get; set; }
 
     /// <summary>
     /// 微信订单号。
     /// </summary>
-    [DataMember(Name = "wechatOrderId")]
+    ////[JsonProperty("wechatOrderId")]
     public string WechatOrderId { get; set; }
 
     /// <summary>
     /// 服务端正式生成的消息对象。
     /// </summary>
-    [DataMember(Name = "message")]
+    ////[JsonProperty("message")]
     public TicketMessageDto Message { get; set; }
 
     /// <summary>
     /// 留言后的工单状态。
     /// </summary>
-    [DataMember(Name = "status")]
+    ////[JsonProperty("status")]
     public string Status { get; set; }
 
     /// <summary>
     /// 留言后的工单版本号字符串。
     /// </summary>
-    [DataMember(Name = "version")]
+    ////[JsonProperty("version")]
     public string Version { get; set; }
 
     /// <summary>
     /// 本次留言是否重新开启了已完结工单。
     /// </summary>
-    [DataMember(Name = "reopened")]
+    ////[JsonProperty("reopened")]
     public bool Reopened { get; set; }
 
     /// <summary>
     /// 是否为幂等编号对应的历史回执。
     /// </summary>
-    [DataMember(Name = "replayed")]
+    ////[JsonProperty("replayed")]
     public bool Replayed { get; set; }
 
     /// <summary>
     /// 接口返回的身份校验标记，当前恒为 false。
     /// </summary>
-    [DataMember(Name = "identityVerified")]
+    ////[JsonProperty("identityVerified")]
     public bool IdentityVerified { get; set; }
 }
 
 /// <summary>
 /// 通用成功状态响应，仅用于在解析具体业务对象前检查顶层 success。
 /// </summary>
-[DataContract]
 internal sealed class ApiSuccessResponse
 {
     /// <summary>
     /// 请求是否成功。
     /// </summary>
-    [DataMember(Name = "success")]
+    ////[JsonProperty("success")]
     public bool Success { get; set; }
 }
 
 /// <summary>
 /// 工单接口错误响应。
 /// </summary>
-[DataContract]
 internal sealed class ApiErrorResponse
 {
     /// <summary>
     /// 请求是否成功，错误响应通常为 false。
     /// </summary>
-    [DataMember(Name = "success")]
+    ////[JsonProperty("success")]
     public bool Success { get; set; }
 
     /// <summary>
     /// 可展示给用户的错误说明。
     /// </summary>
-    [DataMember(Name = "message")]
+    ////[JsonProperty("message")]
     public string Message { get; set; }
 
     /// <summary>
     /// 兼容旧接口的错误说明字段。
     /// </summary>
-    [DataMember(Name = "error")]
+    ////[JsonProperty("error")]
     public string Error { get; set; }
 
     /// <summary>
     /// 服务端错误编码。
     /// </summary>
-    [DataMember(Name = "code")]
+    ////[JsonProperty("code")]
     public string Code { get; set; }
 }
diff --git a/OrderSupportTicket/Models/TicketRealtimeNotification.cs b/OrderSupportTicket/Models/TicketRealtimeNotification.cs
index f9b19e2..8ff2725 100644
--- a/OrderSupportTicket/Models/TicketRealtimeNotification.cs
+++ b/OrderSupportTicket/Models/TicketRealtimeNotification.cs
@@ -1,58 +1,58 @@
-using System.Runtime.Serialization;
+using Newtonsoft.Json;
 
 namespace OrderSupportTicket.Models;
 
 /// <summary>
 /// SSE 实时通知。通知只包含摘要定位信息，收到后需要重新查询对应工单。
 /// </summary>
-[DataContract]
 public sealed class TicketRealtimeNotification
 {
     /// <summary>
     /// 服务端事件 ID，用于至少一次投递时的去重。
     /// </summary>
-    [DataMember(Name = "eventId")]
+    ////[JsonProperty("eventId")]
     public string EventId { get; set; }
 
     /// <summary>
     /// 事件类型，例如 relay.ticket.message_added 或 resync_required。
     /// </summary>
-    [DataMember(Name = "type")]
+    ////[JsonProperty("type")]
     public string Type { get; set; }
 
     /// <summary>
     /// 发生变更的店铺 APPID。
     /// </summary>
-    [DataMember(Name = "appId")]
+    ////[JsonProperty("appId")]
     public string AppId { get; set; }
 
     /// <summary>
     /// 发生变更的微信订单号，保持为数字字符串。
     /// </summary>
-    [DataMember(Name = "wechatOrderId")]
+    ////[JsonProperty("wechatOrderId")]
     public string WechatOrderId { get; set; }
 
     /// <summary>
     /// 新增消息的消息 ID。
     /// </summary>
-    [DataMember(Name = "messageId")]
+    ////[JsonProperty("messageId")]
     public string MessageId { get; set; }
 
     /// <summary>
     /// 工单版本号，按服务端返回的字符串原样保存。
     /// </summary>
-    [DataMember(Name = "version")]
+    ////[JsonProperty("version")]
     public string Version { get; set; }
 
     /// <summary>
     /// 事件发生时间，保留服务端 ISO 8601 字符串。
     /// </summary>
-    [DataMember(Name = "occurredAt")]
+    ////[JsonProperty("occurredAt")]
     public string OccurredAt { get; set; }
 
     /// <summary>
     /// 是否要求客户端执行全量重新同步。
     /// </summary>
+    [JsonIgnore]
     public bool IsResyncRequired =>
         string.Equals(Type, "resync_required", System.StringComparison.OrdinalIgnoreCase);
 }
diff --git a/OrderSupportTicket/OrderSupportTicket.csproj b/OrderSupportTicket/OrderSupportTicket.csproj
index d15a26e..cfaaea6 100644
--- a/OrderSupportTicket/OrderSupportTicket.csproj
+++ b/OrderSupportTicket/OrderSupportTicket.csproj
@@ -11,7 +11,6 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <!--<PackageReference Include="LaunchDarkly.EventSource" Version="6.0.0" />-->
     <PackageReference Include="WPFCommon" Version="1.2.0" />
   </ItemGroup>
 
@@ -23,7 +22,6 @@
   <ItemGroup>
     <Reference Include="System.Configuration" />
     <Reference Include="System.Net.Http" />
-    <Reference Include="System.Runtime.Serialization" />
     <Reference Include="NaiBa.Util">
       <HintPath>..\DllReference\NaiBa.Util.dll</HintPath>
       <Private>true</Private>
diff --git a/OrderSupportTicket/Services/EventSourceTicketRealtimeService.cs b/OrderSupportTicket/Services/EventSourceTicketRealtimeService.cs
index ca3e573..eb5bcf9 100644
--- a/OrderSupportTicket/Services/EventSourceTicketRealtimeService.cs
+++ b/OrderSupportTicket/Services/EventSourceTicketRealtimeService.cs
@@ -1,11 +1,9 @@
 using LaunchDarkly.EventSource;
+using Newtonsoft.Json;
 using OrderSupportTicket.Models;
+using OrderSupportTicket.Models.Api;
 using System;
-using System.IO;
 using System.Linq;
-using System.Runtime.Serialization;
-using System.Runtime.Serialization.Json;
-using System.Text;
 using System.Threading.Tasks;
 
 namespace OrderSupportTicket.Services;
@@ -134,14 +132,9 @@ public sealed class EventSourceTicketRealtimeService : ITicketRealtimeService
         TicketRealtimeNotification notification;
         try
         {
-            var serializer = new DataContractJsonSerializer(
-                typeof(TicketRealtimeNotification));
-            using (var stream = new MemoryStream(Encoding.UTF8.GetBytes(data)))
-            {
-                notification = (TicketRealtimeNotification)serializer.ReadObject(stream);
-            }
+            notification = JsonConvert.DeserializeObject<TicketRealtimeNotification>(data, TicketApiService.JsonSettings);
         }
-        catch (SerializationException)
+        catch (JsonException)
         {
             return;
         }
diff --git a/OrderSupportTicket/Services/TicketApiService.cs b/OrderSupportTicket/Services/TicketApiService.cs
index 14d6fb3..9d78453 100644
--- a/OrderSupportTicket/Services/TicketApiService.cs
+++ b/OrderSupportTicket/Services/TicketApiService.cs
@@ -1,13 +1,11 @@
 using AllBase;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Serialization;
 using OrderSupportTicket.Models;
 using OrderSupportTicket.Models.Api;
 using System;
 using System.Collections.Generic;
-using System.IO;
 using System.Linq;
-using System.Runtime.Serialization;
-using System.Runtime.Serialization.Json;
-using System.Text;
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 using WxOrder.Framework.Commons;
@@ -29,6 +27,11 @@ public sealed class TicketApiService : ITicketApiService
 		new Regex(@"^[\p{L}\p{N}_.@-]{2,120}$", RegexOptions.Compiled);
 	private static readonly Regex OperationIdRegex =
 		new Regex(@"^[A-Za-z0-9_.:-]{1,128}$", RegexOptions.Compiled | RegexOptions.CultureInvariant);
+	internal static readonly JsonSerializerSettings JsonSettings = new JsonSerializerSettings
+	{
+		NullValueHandling = NullValueHandling.Ignore,
+		ContractResolver = new CamelCasePropertyNamesContractResolver()
+	};
 	static TicketApiService()
 	{
 		if (EnvironmentHelper.IsTest)
@@ -259,8 +262,8 @@ public sealed class TicketApiService : ITicketApiService
 		object request)
 	{
 		var url = BuildUri(path);
-		// 请求 DTO 使用 DataMember 驼峰字段，先序列化后走 GetHtml 的字符串重载。
-		var json = Serialize(request);
+		// 请求 DTO 使用 JsonProperty 驼峰字段，先序列化后走 GetHtml 的字符串重载。
+		var json = JsonConvert.SerializeObject(request, JsonSettings);
 		var html = await GetHtml.PostJsonAsync(url, json);
 		if (string.IsNullOrWhiteSpace(html))
 			throw RequestFailed("工单接口未返回数据。");
@@ -275,9 +278,9 @@ public sealed class TicketApiService : ITicketApiService
 		ApiSuccessResponse response;
 		try
 		{
-			response = Deserialize<ApiSuccessResponse>(html);
+			response = JsonConvert.DeserializeObject<ApiSuccessResponse>(html, JsonSettings);
 		}
-		catch (SerializationException)
+		catch (JsonException)
 		{
 			throw RequestFailed(html);
 		}
@@ -296,12 +299,12 @@ public sealed class TicketApiService : ITicketApiService
 		EnsureSuccessBody(html);
 		try
 		{
-			var result = Deserialize<T>(html);
+			var result = JsonConvert.DeserializeObject<T>(html, JsonSettings); 
 			if (result == null)
-				throw new SerializationException("接口响应为空。");
+				throw new JsonSerializationException("接口响应为空。");
 			return result;
 		}
-		catch (SerializationException)
+		catch (JsonException)
 		{
 			throw RequestFailed("工单接口返回了无法解析的数据。", html);
 		}
@@ -314,38 +317,19 @@ public sealed class TicketApiService : ITicketApiService
 
 		try
 		{
-			var error = Deserialize<ApiErrorResponse>(body);
+			var error = JsonConvert.DeserializeObject<ApiErrorResponse>(body, JsonSettings);
 			return error == null
 				? null
 				: error.Message
 					?? error.Error
 					?? error.Code;
 		}
-		catch (SerializationException)
+		catch (JsonException)
 		{
 			return null;
 		}
 	}
 
-	private static string Serialize(object value)
-	{
-		var serializer = new DataContractJsonSerializer(value.GetType());
-		using (var stream = new MemoryStream())
-		{
-			serializer.WriteObject(stream, value);
-			return Encoding.UTF8.GetString(stream.ToArray());
-		}
-	}
-
-	private static T Deserialize<T>(string json)
-	{
-		var serializer = new DataContractJsonSerializer(typeof(T));
-		using (var stream = new MemoryStream(Encoding.UTF8.GetBytes(json ?? string.Empty)))
-		{
-			return (T)serializer.ReadObject(stream);
-		}
-	}
-
 	private static string BuildUri(string path)
 	{
 		return ServerUrl + path;
@@ -368,11 +352,11 @@ public sealed class TicketApiService : ITicketApiService
 
 		try
 		{
-			var error = Deserialize<ApiErrorResponse>(responseBody);
+			var error = JsonConvert.DeserializeObject<ApiErrorResponse>(responseBody, JsonSettings);
 			if (error != null && int.TryParse(error.Code, out var code))
 				return code;
 		}
-		catch (SerializationException)
+		catch (JsonException)
 		{
 			// GetHtml 在网络异常时会返回普通错误文本，此时没有 HTTP 状态码。
 		}
diff --git a/OrderSupportTicket/Views/OrderSupportTicketView.xaml.cs b/OrderSupportTicket/Views/OrderSupportTicketView.xaml.cs
index 953bee4..4ce2cc3 100644
--- a/OrderSupportTicket/Views/OrderSupportTicketView.xaml.cs
+++ b/OrderSupportTicket/Views/OrderSupportTicketView.xaml.cs
@@ -2,6 +2,7 @@ using _29WxOrderWpf.ToolCtrls;
 using OrderSupportTicket.Models;
 using OrderSupportTicket.Services;
 using OrderSupportTicket.ViewModels;
+using System.Runtime.InteropServices;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Input;
@@ -154,16 +155,15 @@ public partial class OrderSupportTicketView : UserControl
         if (window == null)
             return;
 
-        try
-        {
-            Clipboard.SetText(orderId);
-            ToastHelper.Show(window, "订单号已复制");
-        }
-        catch (Exception ex)
-        {
-            ToastHelper.Show(window, "复制失败：" + ex.Message, ToastType.Error);
-        }
-    }
+		if (ClipboardHelper.TrySetText(orderId))
+		{
+			ToastHelper.Show(window, "订单号已复制");
+		}
+		else
+		{
+			ToastHelper.Show(window, "复制失败");
+		}
+	}
 
     private async void OnLoaded(object sender, System.Windows.RoutedEventArgs e)
     {
diff --git a/WxOrder.Framework/Commons/ClipboardHelper.cs b/WxOrder.Framework/Commons/ClipboardHelper.cs
new file mode 100644
index 0000000..6a377e3
--- /dev/null
+++ b/WxOrder.Framework/Commons/ClipboardHelper.cs
@@ -0,0 +1,224 @@
+using System;
+using System.Runtime.InteropServices;
+using System.Threading;
+using System.Threading.Tasks;
+using SysClipboard = System.Windows.Clipboard;
+
+/// <summary>
+/// 剪贴板帮助类（WinForms / WPF 通用）
+/// 解决的问题：
+///  1. CLIPBRD_E_CANT_OPEN (0x800401D0) 等 COMException / ExternalException
+///     （剪贴板被其他进程占用，如远程桌面、剪贴板管理器、杀毒软件、微信/QQ 等）
+///  2. 非 STA 线程调用导致的 ThreadStateException
+///  3. 空字符串 / null 导致的 ArgumentNullException
+/// </summary>
+public static class ClipboardHelper
+{
+	/// <summary>默认重试次数</summary>
+	public static int DefaultRetryCount { get; set; } = 10;
+
+	/// <summary>默认重试间隔（毫秒）</summary>
+	public static int DefaultRetryDelayMs { get; set; } = 100;
+
+	#region 同步 API
+
+	/// <summary>复制文本，失败返回 false，不抛异常</summary>
+	public static bool TrySetText(string text, int retryCount = -1, int retryDelayMs = -1)
+	{
+		return TryExecute(() =>
+		{
+			if (string.IsNullOrEmpty(text))
+				SysClipboard.Clear();
+			else
+				SetDataObjectCore(text);
+			return true;
+		}, out _, retryCount, retryDelayMs);
+	}
+
+	/// <summary>复制任意数据（文本、文件列表、图片、DataObject 等）</summary>
+	public static bool TrySetData(object data, int retryCount = -1, int retryDelayMs = -1)
+	{
+		if (data == null) return false;
+		return TryExecute(() =>
+		{
+			SetDataObjectCore(data);
+			return true;
+		}, out _, retryCount, retryDelayMs);
+	}
+
+	/// <summary>读取文本，失败或无文本返回 null</summary>
+	public static string TryGetText(int retryCount = -1, int retryDelayMs = -1)
+	{
+		TryExecute(() => SysClipboard.ContainsText() ? SysClipboard.GetText() : null,
+			out string result, retryCount, retryDelayMs);
+		return result;
+	}
+
+	/// <summary>清空剪贴板</summary>
+	public static bool TryClear(int retryCount = -1, int retryDelayMs = -1)
+	{
+		return TryExecute(() => { SysClipboard.Clear(); return true; },
+			out _, retryCount, retryDelayMs);
+	}
+
+	/// <summary>复制文本，失败时抛出最后一次的异常</summary>
+	public static void SetText(string text, int retryCount = -1, int retryDelayMs = -1)
+	{
+		Execute(() =>
+		{
+			if (string.IsNullOrEmpty(text))
+				SysClipboard.Clear();
+			else
+				SetDataObjectCore(text);
+			return true;
+		}, retryCount, retryDelayMs);
+	}
+
+	#endregion
+
+	#region 异步 API（不阻塞 UI 线程，建议在 UI 线程 await 调用）
+
+	public static async Task<bool> TrySetTextAsync(string text, int retryCount = -1, int retryDelayMs = -1)
+	{
+		retryCount = retryCount < 0 ? DefaultRetryCount : retryCount;
+		retryDelayMs = retryDelayMs < 0 ? DefaultRetryDelayMs : retryDelayMs;
+
+		for (int i = 0; i < retryCount; i++)
+		{
+			try
+			{
+				RunSta(() =>
+				{
+					if (string.IsNullOrEmpty(text))
+						SysClipboard.Clear();
+					else
+						SetDataObjectCore(text);
+					return true;
+				});
+				return true;
+			}
+			catch (Exception ex) when (IsRetryable(ex))
+			{
+				if (i < retryCount - 1)
+					await Task.Delay(retryDelayMs).ConfigureAwait(true); // 回到 UI 线程
+			}
+			catch
+			{
+				return false;
+			}
+		}
+		return false;
+	}
+
+	public static async Task<string> TryGetTextAsync(int retryCount = -1, int retryDelayMs = -1)
+	{
+		retryCount = retryCount < 0 ? DefaultRetryCount : retryCount;
+		retryDelayMs = retryDelayMs < 0 ? DefaultRetryDelayMs : retryDelayMs;
+
+		for (int i = 0; i < retryCount; i++)
+		{
+			try
+			{
+				return RunSta(() => SysClipboard.ContainsText() ? SysClipboard.GetText() : null);
+			}
+			catch (Exception ex) when (IsRetryable(ex))
+			{
+				if (i < retryCount - 1)
+					await Task.Delay(retryDelayMs).ConfigureAwait(true);
+			}
+			catch
+			{
+				return null;
+			}
+		}
+		return null;
+	}
+
+	#endregion
+
+	#region 内部实现
+
+	private static void SetDataObjectCore(object data)
+	{
+		SysClipboard.SetDataObject(data, true);
+	}
+
+	private static T Execute<T>(Func<T> action, int retryCount, int retryDelayMs)
+	{
+		retryCount = retryCount < 0 ? DefaultRetryCount : retryCount;
+		retryDelayMs = retryDelayMs < 0 ? DefaultRetryDelayMs : retryDelayMs;
+		if (retryCount < 1) retryCount = 1;
+
+		for (int i = 0; ; i++)
+		{
+			try
+			{
+				return RunSta(action);
+			}
+			catch (Exception ex) when (IsRetryable(ex) && i < retryCount - 1)
+			{
+				Thread.Sleep(retryDelayMs);
+			}
+		}
+	}
+
+	private static bool TryExecute<T>(Func<T> action, out T result, int retryCount, int retryDelayMs)
+	{
+		try
+		{
+			result = Execute(action, retryCount, retryDelayMs);
+			return true;
+		}
+		catch
+		{
+			result = default(T);
+			return false;
+		}
+	}
+
+	/// <summary>剪贴板必须在 STA 线程访问；当前不是 STA 就新建一个 STA 线程执行</summary>
+	private static T RunSta<T>(Func<T> action)
+	{
+		if (Thread.CurrentThread.GetApartmentState() == ApartmentState.STA)
+			return action();
+
+		T result = default(T);
+		Exception error = null;
+		var thread = new Thread(() =>
+		{
+			try { result = action(); }
+			catch (Exception ex) { error = ex; }
+		});
+		thread.SetApartmentState(ApartmentState.STA);
+		thread.Start();
+		thread.Join();
+
+		if (error != null)
+		{
+			// 保留原始异常类型，便于上层判断
+			System.Runtime.ExceptionServices.ExceptionDispatchInfo.Capture(error).Throw();
+		}
+		return result;
+	}
+
+	/// <summary>
+	/// 判断是否为"剪贴板暂时被占用"类的可重试异常
+	/// COMException 继承自 ExternalException，所以一起覆盖
+	/// </summary>
+	private static bool IsRetryable(Exception ex)
+	{
+		if (ex is ExternalException)
+		{
+			// 0x800401D0 CLIPBRD_E_CANT_OPEN
+			// 0x800401D1 CLIPBRD_E_CANT_EMPTY
+			// 0x800401D2 CLIPBRD_E_CANT_SET
+			// 0x800401D3 CLIPBRD_E_BAD_DATA
+			// 0x800401D4 CLIPBRD_E_CANT_CLOSE
+			// WinForms 的 "Requested Clipboard operation did not succeed" 也是 ExternalException
+			return true;
+		}
+		return false;
+	}
+
+	#endregion
+}
\ No newline at end of file