C#通过特性的方式去校验指定数据是否为空

1.特性定义

[AttributeUsage(AttributeTargets.Property)]
public class VerificationAttribute : Attribute
{
    public bool IsEmpty => true;
    public VerificationAttribute()
    {
    }
}

2.定义在属性上

/// <summary>
/// 域名
/// </summary>
[Verification]
public string FieldName { get; set; } = "FIELD_NAME";

/// <summary>
/// 值名
/// </summary>
[Verification]
public string FieldValue { get; set; } = "FIELD_VAL";

3.基类实现，通过特性的方式去校验指定数据是否为空，判断list是否为空

protected bool CanSave()
      {
          Type property = Setting.GetType();
          var list = property.GetProperties().ToList();
          foreach (var item in list)
          {
              VerificationAttribute? attribute = (VerificationAttribute?)item.GetCustomAttribute(typeof(VerificationAttribute));
              if (attribute != null)
              {
                  var proValue = item.GetValue(Setting);
                  if (proValue == null)
                      return false;
                  else if (item.PropertyType == typeof(string))
                  {
                      if (string.IsNullOrEmpty(proValue.ToString()?.Trim()))
                          return false;
                  }
                  else if (item.PropertyType == typeof(bool))
                  {
                      if (!(bool)proValue)
                          return false;
                  }
                  else if (typeof(IEnumerable).IsAssignableFrom(item.PropertyType))
                  {
                      IEnumerable<object>? enumerable = proValue as IEnumerable<object>;
                      if (enumerable == null)
                          return false;
                      if (!enumerable.Any())
                          return false;
                  }
                  else
                      return false;
              }
          }

          return true;
      }