如何存储枚举值的字符串描述？

发布于 2024-09-08 12:44:35 字数 756 浏览 6 评论 0原文

我正在开发的应用程序有很多枚举。

这些值通常是从应用程序的下拉列表中选择的。

存储这些值的字符串描述的普遍接受的方式是什么？

这是当前的问题：

Public Enum MyEnum
   SomeValue = 1
   AnotherValue = 2
   ObsoleteValue = 3
   YetAnotherValue = 4
End Enum

下拉列表应具有以下选择：

Some Value
Another Value
Yet Another Value (Minor Description)

并非所有都适合枚举名称（其中一个的次要描述是一个示例），并且并非所有枚举值都是“当前”值。有些保留只是为了向后兼容和显示目的（即打印输出，而不是表格）。

这导致了以下代码情况：

For index As Integer = 0 To StatusDescriptions.GetUpperBound(0)
   ' Only display relevant statuses.
   If Array.IndexOf(CurrentStatuses, index) >= 0 Then
      .Items.Add(New ExtendedListViewItem(StatusDescriptions(index), index))
   End If
Next

这似乎可以做得更好，但我不确定如何做。

原文

The application I'm working on has lots of enumerations.

These values are generally selected from drop downs in the application.

What is the generally accepted way of storing the string description of these values?

Here is the current issue at hand:

Public Enum MyEnum
   SomeValue = 1
   AnotherValue = 2
   ObsoleteValue = 3
   YetAnotherValue = 4
End Enum

The drop down should have the following selections:

Some Value
Another Value
Yet Another Value (Minor Description)

Not all fit the name of the enumeration, (minor description on one is an example), and not all enumeration values are -current- values. Some remain only for backwards compatibility and display purposes (ie printouts, not forms).

This leads to the following code situation:

For index As Integer = 0 To StatusDescriptions.GetUpperBound(0)
   ' Only display relevant statuses.
   If Array.IndexOf(CurrentStatuses, index) >= 0 Then
      .Items.Add(New ExtendedListViewItem(StatusDescriptions(index), index))
   End If
Next

This just seems like it could be done better, and I'm not sure how.

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〆凄凉。 2024-09-15 12:44:36

我见过的最常见的方法是使用 System.ComponentModel.DescriptionAttribute 注释枚举。

Public Enum MyEnum

   <Description("Some Value")>
   SomeValue = 1
...

然后要获取该值，请使用扩展方法（请原谅我的 C#，我将在一分钟内转换它）：

<System.Runtime.CompilerServices.Extension()> 
Public Function GetDescription(ByVal value As Enum) As String
   Dim description As String =  String.Empty 

   Dim fi As FieldInfo =  value.GetType().GetField(value.ToString()) 
   Dim da = 
       CType(Attribute.GetCustomAttribute(fi,Type.GetType(DescriptionAttribute)),
                                             DescriptionAttribute)

   If da Is Nothing
      description = value.ToString()
   Else
      description = da.Description
   End If

   Return description
End Function

这是我将其转换为 VB 的最佳尝试。将其视为伪代码；）

The most common way I've seen is to annotate your enums with the System.ComponentModel.DescriptionAttribute.

Public Enum MyEnum

   <Description("Some Value")>
   SomeValue = 1
...

Then to fetch the value, use an extension method (excuse my C#, I'll convert it in a minute):

<System.Runtime.CompilerServices.Extension()> 
Public Function GetDescription(ByVal value As Enum) As String
   Dim description As String =  String.Empty 

   Dim fi As FieldInfo =  value.GetType().GetField(value.ToString()) 
   Dim da = 
       CType(Attribute.GetCustomAttribute(fi,Type.GetType(DescriptionAttribute)),
                                             DescriptionAttribute)

   If da Is Nothing
      description = value.ToString()
   Else
      description = da.Description
   End If

   Return description
End Function

That's my best stab at converting it to VB. Treat it as pseudocode ;)

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北城半夏 2024-09-15 12:44:35

您可以使用 说明 属性（C# 代码，但应该翻译）：

public enum XmlValidationResult
{
    [Description("Success.")]
    Success,
    [Description("Could not load file.")]
    FileLoadError,
    [Description("Could not load schema.")]
    SchemaLoadError,
    [Description("Form XML did not pass schema validation.")]
    SchemaError
}

private string GetEnumDescription(Enum value)
{
    // Get the Description attribute value for the enum value
    FieldInfo fi = value.GetType().GetField(value.ToString());
    DescriptionAttribute[] attributes = 
        (DescriptionAttribute[])fi.GetCustomAttributes(
            typeof(DescriptionAttribute), false);

    if (attributes.Length > 0)
    {
        return attributes[0].Description;
    }
    else
    {
        return value.ToString();
    }
}

来源

You could use the Description attribute (C# code, but it should translate):

public enum XmlValidationResult
{
    [Description("Success.")]
    Success,
    [Description("Could not load file.")]
    FileLoadError,
    [Description("Could not load schema.")]
    SchemaLoadError,
    [Description("Form XML did not pass schema validation.")]
    SchemaError
}

private string GetEnumDescription(Enum value)
{
    // Get the Description attribute value for the enum value
    FieldInfo fi = value.GetType().GetField(value.ToString());
    DescriptionAttribute[] attributes = 
        (DescriptionAttribute[])fi.GetCustomAttributes(
            typeof(DescriptionAttribute), false);

    if (attributes.Length > 0)
    {
        return attributes[0].Description;
    }
    else
    {
        return value.ToString();
    }
}

Source

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