游戏视口焦点与y轴上的碰撞检测相对于重力(game viewport focus vs collision detection on y axis against gravity)

 为什么不将值放在枚举本身上然后枚举？ 
 
 例如，使用System.ComponentModel Description属性，我们可以将该信息添加到枚举本身，例如： 
 
public enum cardCreate
{
  [Description("General Response")]
  MsgType = 0,

  [Description("V2.0")]
  WSName = 2,

  [Description("OmegaMan")]
  ReplyTo = 3,

  [Description("Windows 10")]
  SourceSystem = 4,
}
 
 因此，当我们调用一个特殊的方法来枚举枚举时，我们可以在其中提取该文本并在以后适当地使用它，例如： 
 
myextensions.GetEnumValues<cardCreate>()
            .Select (ceEnum => new
                        {
                            Original   = ceEnum,
                            IndexValue = (int)ceEnum,
                            Text       = ceEnum.GetAttributeDescription()
                        })
 
 投影（选择）后，动态实体将如下所示： 
 
 
 甜！ 现在，我们将所有信息都放在易于消费的实体中，提供所需的所有信息。 
 
 什么？ 您需要的不仅仅是字符串描述吗？ 然后在enum上创建自定义属性，并根据需要返回所有项目/数据类型。 为此，请参阅我的博客文章C＃在对象上使用扩展属性信息 。 
 
 
 以下是上例中使用的扩展方法： 
 
public static class myextensions
{
   public static IEnumerable<T> GetEnumValues<T>()
   {
       Type type = typeof( T );

       if (!type.IsEnum)
           throw new Exception( string.Format("{0} is not an enum.", type.FullName ));

       FieldInfo[] fields =
           type.GetFields( BindingFlags.Public | BindingFlags.Static );


       foreach (var item in fields)
           yield return (T)item.GetValue( null );
   }


  /// <summary>If an attribute on an enumeration exists, this will return that
   /// information</summary>
   /// <param name="value">The object which has the attribute.</param>
   /// <returns>The description string of the attribute or string.empty</returns>
   public static string GetAttributeDescription( this object value )
   {
       string retVal = string.Empty;
       try
       {
           retVal = value.GetType()
                         .GetField( value.ToString() )
                         .GetCustomAttributes( typeof( DescriptionAttribute ), false )
                         .OfType<DescriptionAttribute>()
                         .First()
                         .Description;

       }
       catch (NullReferenceException)
       {
           //Occurs when we attempt to get description of an enum value that does not exist
       }
       finally
       {
           if (string.IsNullOrEmpty( retVal ))
               retVal = "Unknown";
       }

       return retVal;
   }

}

Why not place the values onto the enum itself and then enumerate?
 
For example using System.ComponentModel Description attribute we can add that information to the enum itself such as:
 
public enum cardCreate
{
  [Description("General Response")]
  MsgType = 0,

  [Description("V2.0")]
  WSName = 2,

  [Description("OmegaMan")]
  ReplyTo = 3,

  [Description("Windows 10")]
  SourceSystem = 4,
}
 
So when we call a special method to enumerate the enum where we can extract that text and use it appropriately later such as:
 
myextensions.GetEnumValues<cardCreate>()
            .Select (ceEnum => new
                        {
                            Original   = ceEnum,
                            IndexValue = (int)ceEnum,
                            Text       = ceEnum.GetAttributeDescription()
                        })
 
The dynamic entity will look like this after the projection (the select):
 
 
Sweet! Now we have all the information in a easy consumable entity which provides all the information needed. 
 
What? You need more than a string description? Then create a custom attribute on the enum and have all items/types of data to return as needed. For that see my blog article C# Using Extended Attribute Information on Objects.
 
 
Here are the extension methods used in the above example:
 
public static class myextensions
{
   public static IEnumerable<T> GetEnumValues<T>()
   {
       Type type = typeof( T );

       if (!type.IsEnum)
           throw new Exception( string.Format("{0} is not an enum.", type.FullName ));

       FieldInfo[] fields =
           type.GetFields( BindingFlags.Public | BindingFlags.Static );


       foreach (var item in fields)
           yield return (T)item.GetValue( null );
   }


  /// <summary>If an attribute on an enumeration exists, this will return that
   /// information</summary>
   /// <param name="value">The object which has the attribute.</param>
   /// <returns>The description string of the attribute or string.empty</returns>
   public static string GetAttributeDescription( this object value )
   {
       string retVal = string.Empty;
       try
       {
           retVal = value.GetType()
                         .GetField( value.ToString() )
                         .GetCustomAttributes( typeof( DescriptionAttribute ), false )
                         .OfType<DescriptionAttribute>()
                         .First()
                         .Description;

       }
       catch (NullReferenceException)
       {
           //Occurs when we attempt to get description of an enum value that does not exist
       }
       finally
       {
           if (string.IsNullOrEmpty( retVal ))
               retVal = "Unknown";
       }

       return retVal;
   }

}