初始化

FutureMailAPI/DTOs/UserDTOs.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace FutureMailAPI.DTOs
+{
+    public class UserRegisterDto
+    {
+        [Required(ErrorMessage = "用户名是必填项")]
+        [StringLength(100, MinimumLength = 3, ErrorMessage = "用户名长度必须在3-100个字符之间")]
+        public string Username { get; set; } = string.Empty;
+        
+        [Required(ErrorMessage = "邮箱是必填项")]
+        [EmailAddress(ErrorMessage = "请输入有效的邮箱地址")]
+        public string Email { get; set; } = string.Empty;
+        
+        [Required(ErrorMessage = "密码是必填项")]
+        [StringLength(100, MinimumLength = 6, ErrorMessage = "密码长度必须在6-100个字符之间")]
+        public string Password { get; set; } = string.Empty;
+        
+        [StringLength(100, ErrorMessage = "昵称长度不能超过100个字符")]
+        public string? Nickname { get; set; }
+    }
+    
+    public class UserResponseDto
+    {
+        public int Id { get; set; }
+        public string Username { get; set; } = string.Empty;
+        public string Email { get; set; } = string.Empty;
+        public string? Nickname { get; set; }
+        public string? Avatar { get; set; }
+        public DateTime CreatedAt { get; set; }
+        public DateTime? LastLoginAt { get; set; }
+    }
+    
+    public class UserUpdateDto
+    {
+        [StringLength(100, ErrorMessage = "昵称长度不能超过100个字符")]
+        public string? Nickname { get; set; }
+        
+        [StringLength(500, ErrorMessage = "头像URL长度不能超过500个字符")]
+        public string? Avatar { get; set; }
+    }
+    
+    public class ChangePasswordDto
+    {
+        [Required(ErrorMessage = "当前密码是必填项")]
+        public string CurrentPassword { get; set; } = string.Empty;
+        
+        [Required(ErrorMessage = "新密码是必填项")]
+        [StringLength(100, MinimumLength = 6, ErrorMessage = "密码长度必须在6-100个字符之间")]
+        public string NewPassword { get; set; } = string.Empty;
+    }
+    
+    public class RefreshTokenRequestDto
+    {
+        [Required(ErrorMessage = "令牌是必填项")]
+        public string Token { get; set; } = string.Empty;
+    }
+}