调用自定义程序集属性 [英] Calling Custom Assembly Attributes

问题描述

我已经创建了一个自定义属性，并在AssemblyInfo.vb文件中使用了它。该属性在另一个文件中声明，如下所示：

I have created a custom attribute and use it in the AssemblyInfo.vb file. The attribute is declared in another file like so:

Public NotInheritable Class AssemblyBuildNameAttribute
    Inherits Attribute

    Private _p1 As String

    Sub New(p1 As String)
        ' TODO: Complete member initialization 
        _p1 = p1
    End Sub

End Class

并且位于AssemblyInfo.vb文件中，如下所示：

And is in the AssemblyInfo.vb file like so:

<Assembly: AssemblyVersion("0.4.15")> 
<Assembly: AssemblyFileVersion("13.10.1.8")> 
<Assembly: AssemblyBuildName("alpha")>

如何命名此自定义属性？我希望能够像调用版本信息一样来调用它：

How can I call this custom attribute?? I would like to be able to call it just like I call the version information like so:

Public Class AppInfo
  Public Shared Function VersionMajor() As String
    Return Assembly.GetExecutingAssembly().GetName().Version.Major.ToString()
  End Function
  Public Shared Function VersionMinor() As String
    Return Assembly.GetExecutingAssembly().GetName().Version.Minor.ToString()
  End Function
  Public Shared Function VersionPatch() As String
    Return Assembly.GetExecutingAssembly().GetName().Version.Build.ToString()
  End Function
End Class

推荐答案

您必须使用Reflection获取属性信息和值，并且每个属性都需要一个proc。

You have to use Reflection to get attribute information and value, and you will need one proc for each attribute.

首先，您的示例Attribute类缺少一个关键项：如何返回信息。您需要添加一个属性获取器：

First though, your sample Attribute class is missing a key item: HOW TO RETURN the info. You need to add a property getter:

Friend ReadOnly GetBuild() As String
   Get
      Return _p1
   End Get
End Property

现在就准备好了

Friend Function GetAsmBuild() As String
    Dim assy As [Assembly] = [Assembly].GetExecutingAssembly
    Dim Attributes As Object()


    Attributes = assy.GetCustomAttributes(GetType(AssemblyBuildNameAttribute), False)
    If Attributes.Length > 0 Then
        Return Attributes(0).GetBuild
    Else
       Return String.Empty
    End If

 End Function

GetVersion 是Property getter的名称。因此，对于我添加的那个对象，将是：

GetVersion is the name of the Property getter. So for the one I added it would be:

Return Attributes(0).GetBuild

与获取类或枚举等的Attr大约相同。此外：程序集已经具有版本，因此您可以在Project属性中进行控制设置。并且procs已经存在于 System.Reflection 中以返回它们。

It is about the same as getting Attr for Classes or Enums etc. Also: Assemblies already have a version and such you can control in the Project properties settings. And procs already exist in System.Reflection to return them.

编辑：

在运行时获取信息的方式：

The way to get the info at runtime:

Public Shared Function VersionPatch() As String
    Return GetAsmBuild
 End Function

或命名我的proc 版本补丁

or name my proc VersionPatch

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