比较相同类的实例并用新值更新旧实例

比较相同类的实例。

public class Student()
{
    public string Name {get; set;}
    public string Hobby {get; set;}
    public string Country {get; set;}
}

Student old = new Student { Name = "A", Hobby = "Swim", Country = "HK" };
Student new = new Student { Name = "A", Hobby = "Jog", Country = "US" };

如果旧的和新的相等，则比较，否则，替换不同的类的每个字段。比如将旧值更新为新值。

If(old != new)
{
    UpdateOldWithNew(old, new);
}

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