c# - 找不到命名空间名称 'Display' 和 'DisplayAttribute'

Question

在尝试编译我的 .Dll 时，我设法找出了所有引用资料和错误，除了这两个(我有多个)。

"The type or namespace name 'Display' could not be found(are you missing a using directive or an assembly reference?)"

"The type or namespace name 'DisplayAttribute' could not be found(are you missing a using directive or an assembly reference?)"

我正在使用 System.ComponentModel 和 System.ComponentModel.DataAnnotations。请原谅我，因为我对所有这些都很模糊，我只是对这个项目做了一个小改动。我不明白我缺少什么引用导致这些错误，我也确定问题是由我的经验不足引起的。感谢任何帮助，谢谢。

一小部分代码:

using PatientTracker.Entities.Validation;
using System;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Runtime.Serialization;
using System.Xml.Serialization;

namespace PatientTracker.Entities
{
  [Serializable]
  public abstract class EntityBaseCore : IEntity, INotifyPropertyChanged, IDataErrorInfo, IDeserializationCallback, INotifyPropertyChanging
  {
    [Display(AutoGenerateField = false)]
    [NonSerialized]
    protected bool bindingIsNew = true;
    [Display(AutoGenerateField = false)]
    [NonSerialized]
    private bool isEntityTracked;
    [Display(AutoGenerateField = false)]
    [NonSerialized]
    private bool suppressEntityEvents;
    private string entityHashCode;
    [NonSerialized]
    private object tag;
    [NonSerialized]
    private ValidationRules _validationRules;

    [Display(AutoGenerateField = false)]
    public abstract string TableName { get; }

    [Display(AutoGenerateField = false)]
    public abstract string[] TableColumns { get; }

    [Browsable(false)]
    [Display(AutoGenerateField = false)]
    public virtual bool IsDeleted
    {
      get
      {
        return this.EntityState == EntityState.Deleted;
      }
    }

Answer 1

我右键单击显示并使用上面给出的程序集名称进行解析，它工作正常。删除和添加程序集没有。