HOW TO:程序集内读取内嵌默认资源

Author:水如烟

当用Reflector查看程序集资源时,我们通常都会看到三个类SR,SRCategoryAttribute和SRDescriptionAttribute,来读取当前程序集的资源信息。
在这里，所谓的默认我指的是在Framework2.0里。默认的资源名称一般是[RootNameSpace].Resources.resources。
三个类的代码在各程序集中基本是一样的，但因为各自的资源有异，它的Resourcemanager定义为Private，而其它的变量和方法，基本上是Shared。再一点，它只服务于本程序集，所以多用Friend限***用范围。代码有些技巧，稍增改，如下：

SR.VB

Imports System.Resources, System.Globalization

Friend NotInheritable Class SR

'如是特殊名称，在这修改。默认的为[RootNameSpace].Resources.resources
Friend Sub New()
Dim localAssembly As Reflection.Assembly = Reflection.Assembly.GetExecutingAssembly
Dim baseName As String = Nothing
For Each resourceName As String In localAssembly.GetManifestResourceNames
If System.Text.RegularExpressions.Regex.IsMatch(resourceName, ".Resources.resources$") Then
baseName = resourceName
Exit For
End If
Next
Me.m_resources = New ResourceManager(baseName, localAssembly)
End Sub

Private Shared Function GetLoader() As SR
If SR.loader Is Nothing Then
SyncLock SR.InternalSyncObject
If SR.loader Is Nothing Then
SR.loader = New SR
End If
End SyncLock
End If
Return loader
End Function

Public Shared Function GetObject(ByVal name As String) As Object
SR.GetLoader()
If SR.loader Is Nothing Then
Return Nothing
End If

Return SR.Resources.GetObject(name, SR.Culture)
End Function

Public Shared Function GetString(ByVal name As String) As String
SR.GetLoader()
If SR.loader Is Nothing Then
Return Nothing
End If

Return SR.Resources.GetString(name, SR.Culture)
End Function

Public Shared Function GetString(ByVal name As String, ByVal ParamArray args As Object()) As String
SR.GetLoader()
If SR.loader Is Nothing Then
Return Nothing
End If

Dim Result As String
Result = SR.Resources.GetString(name, SR.Culture)
If ((args Is Nothing) OrElse (args.Length <= 0)) Then
Return Result
End If

Dim argsCount As Integer = 0
Do While argsCount < args.Length
Dim argString As String = TryCast(args(argsCount), String)
If (Not argString Is Nothing) AndAlso (argString.Length > 1024) Then
args(argsCount) = (argString.Substring(0, 1021) & "

")
End If
argsCount += 1
Loop

Return String.Format(CultureInfo.CurrentCulture, Result, args)
End Function

Private Shared ReadOnly Property Culture() As CultureInfo
Get
Return Nothing '取本地CultureInfo
End Get
End Property

Private Shared ReadOnly Property InternalSyncObject() As Object
Get
If (SR.s_InternalSyncObject Is Nothing) Then
Dim tmpObj As New Object
System.Threading.Interlocked.CompareExchange(SR.s_InternalSyncObject, tmpObj, Nothing)
End If
Return SR.s_InternalSyncObject
End Get
End Property

Public Shared ReadOnly Property Resources() As ResourceManager
Get
Return SR.loader.m_resources
End Get

End Property

Private Shared loader As SR
Private Shared s_InternalSyncObject As Object

Private m_resources As ResourceManager

'Friend Const Text1 As String = "Text1"
End Class

SRCategoryAttribute.VB

Imports System.ComponentModel

<AttributeUsage(AttributeTargets.All)> _
Friend NotInheritable Class SRCategoryAttribute
Inherits CategoryAttribute

Public Sub New(ByVal category As String)
MyBase.New(category)
End Sub

Protected Overrides Function GetLocalizedString(ByVal value As String) As String
Return SR.GetString(value)
End Function
End Class

SRDescriptionAttribute.VB

Imports System.ComponentModel

<AttributeUsage(AttributeTargets.All)> _
Friend NotInheritable Class SRDescriptionAttribute
Inherits DescriptionAttribute

Private replaced As Boolean

Public Sub New(ByVal description As String)
MyBase.New(description)
End Sub

Public Overrides ReadOnly Property Description() As String
Get
If Not Me.replaced Then
Me.replaced = True
MyBase.DescriptionValue = SR.GetString(MyBase.Description)
End If
Return MyBase.Description
End Get
End Property

End Class