Mapster - 如何忽略空属性的映射

Mapster - How to do ignore mapping for null properties

我正在使用 Mapster 将 Dto 实例映射到模型对象。

Dto 由 Javascript 客户端发送,仅发送更新的属性。

我想忽略空值,并让 Mapster 保留此属性的模型实例不变。

一个更好地解释场景的简化示例:

// My .Net Dto class, used for client/server communication.
public class PersonDto
{
  public string Id { get; set; }
  public string Name { get; set; }
  public string Family { get; set; }
}

// My Model class. Let's assume is the same data as per the Dto.
public class Person
{
  public string Id { get; set; }
  public string Name { get; set; }
  public string Family { get; set; }
}

public void Update()
{
  var existingPerson = new Person
  {
    Id = "A",
    Name = "Ned",
    Family = "Stark"
  };

  var patchDataSentFromClient = new PersonDto
  {
    Id = "A",
    Name = "Rob"
  };

  patchDataSentFromClient.Adapt(existingPerson);

  // Here existingPerson.Family should be "Stark", but it gets emptied out.
  // the mapping should be equivalent to:
  // if (patchDataSentFromClient.Family != null) existingPerson.Family = patchDataSentFromClient.Family;
}

编辑:重点是我不想为我的 Dto 中的数千个属性中的每一个写下映射条件。我希望 Mapster 按名称自动映射所有字符串属性,但保留 "patch-like" 忽略空值的逻辑。

您可以使用 IgnoreNullValues.