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WebApi/Controllers/Dto/EmailMessageDto.cs

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+namespace WebApi.Controllers.Dto;
+
+/// <summary>
+/// 邮件消息DTO，包含额外的统计信息
+/// </summary>
+public class EmailMessageDto
+{
+    public long Id { get; set; }
+    public string Subject { get; set; } = string.Empty;
+    public string From { get; set; } = string.Empty;
+    public string Body { get; set; } = string.Empty;
+    public string HtmlBody { get; set; } = string.Empty;
+    public DateTime ReceivedDate { get; set; }
+    public DateTime CreateTime { get; set; }
+    public DateTime? UpdateTime { get; set; }
+    
+    /// <summary>
+    /// 已解析的账单数量
+    /// </summary>
+    public int TransactionCount { get; set; }
+    
+    /// <summary>
+    /// 从实体转换为DTO
+    /// </summary>
+    public static EmailMessageDto FromEntity(Entity.EmailMessage entity, int transactionCount = 0)
+    {
+        return new EmailMessageDto
+        {
+            Id = entity.Id,
+            Subject = entity.Subject,
+            From = entity.From,
+            Body = entity.Body,
+            HtmlBody = entity.HtmlBody,
+            ReceivedDate = entity.ReceivedDate,
+            CreateTime = entity.CreateTime,
+            UpdateTime = entity.UpdateTime,
+            TransactionCount = transactionCount
+        };
+    }
+}