在自定义UITypeEditor中使用OR'ed枚举 [英] Using a OR'ed Enum in a custom UITypeEditor

问题描述

我有一个自定义控件的属性，我写的是一个基于标志的枚举。我创建了自己的自定义控件来编辑它，使其具有逻辑意义，并从我自己的UITypeEditor中调用它。问题是，当我尝试存储的值是它告诉我该值无效的标志的组合时，Visual Studio会生成错误。

示例：

  public enum TrayModes 
 {
 SingleUnit = 0x01 
，Tray = 0x02 
，Poll = 0x04 
，Trigger = 0x08 
}; 
  

如果要保存的值为 SingleUnit |触发器生成的值为9.这反过来又会产生以下错误：

$ b $你必须在你的枚举声明之前添加[Flags]

[Flags] $ {$ class =h2_lin>解决方案

b $ b public enum TrayModes
{
SingleUnit = 0x01
，Tray = 0x02
，Poll = 0x04
，Trigger = 0x08
};

考虑使用HasFlag函数检查已设置的标志

  TrayModes t = TrayModes.SingleUnit | TrayModes.Poll; 
 if（t.HasFlag（TrayModes.SingleUnit））
 // return true 
  

编辑：
这是因为具有flags属性的枚举以不同的方式处理，
，您可以在 http://msdn.microsoft.com/en-us/library/system.flagsattribute.aspx
A到一个枚举的字符串有和没有Flags属性显示它们是如何不同的

的值的所有可能组合没有FlagsAttribute的枚举：

  0  - 黑色
 1  - 红色
 2  - 绿色
 3  -  3 
 4  - 蓝色
 5 -  5 
 6  -  6 
 7  -  7 
 8  -  8 
  

的值的所有可能组合与FlagsAttribute的枚举：

  0  -  Black 
 1  - 红色
 2  - 绿色
 3  - 红色，绿色
 4  - 蓝色
 5  - 红色，蓝色
 6  - 绿色，蓝色
 7  - 红色，绿色，蓝色e 
 8  -  8 
  

I have a property on a custom control I have written that is an Flag based Enum. I created my own custom control to edit it in a way that makes logical sense and called it from my own UITypeEditor. The problem is that Visual Studio generates an error when the value I attempt to store is a combination of the flags it tells me the value is invalid.

Example:

public enum TrayModes
{ 
    SingleUnit = 0x01
  , Tray = 0x02
  , Poll = 0x04
  , Trigger = 0x08
};

If the value I want to save is SingleUnit | Trigger the value generated is 9. Which in turn creates the following error:

解决方案

You have to add [Flags] before your enum declaration

[Flags]
public enum TrayModes
{ 
    SingleUnit = 0x01
   , Tray = 0x02
   , Poll = 0x04
   , Trigger = 0x08
};

Consider using HasFlag function to check for setted flags

TrayModes t=TrayModes.SingleUnit|TrayModes.Poll;
if(t.HasFlag(TrayModes.SingleUnit))
//return true

Edit: That's because enum with flags attribute are threated in a different way, as you can see in the example in http://msdn.microsoft.com/en-us/library/system.flagsattribute.aspx A To string of enum with and without Flags attribute show how they are different

All possible combinations of values of an Enum without FlagsAttribute:

  0 - Black
  1 - Red
  2 - Green
  3 - 3
  4 - Blue
  5 - 5
  6 - 6
  7 - 7
  8 - 8

All possible combinations of values of an Enum with FlagsAttribute:

  0 - Black
  1 - Red
  2 - Green
  3 - Red, Green
  4 - Blue
  5 - Red, Blue
  6 - Green, Blue
  7 - Red, Green, Blue
  8 - 8

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