C# RazorPg - 检查表单字段是否为空并标记为未更改

Question

I have a form field that allows users to change their email address. If the user doesn't enter anything in the field I want to send "unchanged" to the API. Not blank "" or null.

我想出了这段代码：

if (!String.IsNullOrEmpty(Request.Form["Email"].ToString()))  // Null or blank check
{
 if (Request.Form["Email"].ToString() != user.Email)  // Don't update email if it's the same as the existing one
  {
    user.Email = Request.Form["Email"];
  }
  else
  {
    user.Email = "unchanged";      // I don't want to pass null or blank to the API.
  }
}
else
{
 user.Email = "unchanged";
}

对我来说它看起来很乱。我在页面上有 10 个字段，所以我会在我的控制器中列出 10 次。

有更好的方法吗？

Answer 1

我认为您可以在 User 模型中初始化 Email 属性：

public string Email { get; set; } = "unchanged"; 

您也可以在默认构造函数中执行此操作。