.NET assemblyBinding配置忽略在machine.config中
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10-07-2019 - |
题
我有一个情况,我需要能够基于它们的部分名称在GAC装载程序集。为了做到这一点,我已经添加了以下到我的app.config文件:
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<qualifyAssembly partialName="MyAssembly"
fullName= "MyAssembly, Version=1.0.0.0, Culture=neutral, PublicKeyToken=0123456789abcdef"/>
</assemblyBinding>
</runtime>
这工作正是我想要的方式运行。但是,如果我把相同的元素在我machine.config文件,它似乎被忽略,并试图加载MyAssembly的,当我得到FileNotFoundExceptions。
以下是组件绑定日志当该元件是在我的app.config和绑定成功:
LOG: This bind starts in default load context. LOG: Using application configuration file: C:\Documents and Settings\jon_scheiding\My Documents\Source\Testing\Test Projects 1\Cmd\bin\Debug\Testers.Cmd.vshost.exe.config LOG: Using machine configuration file from C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\config\machine.config. LOG: Partial reference qualified from config file. New reference: MyAssembly, Version=1.0.0.0, Culture=neutral, PublicKeyToken=0123456789abcdef. LOG: Post-policy reference: MyAssembly, Version=1.0.0.0, Culture=neutral, PublicKeyToken=0123456789abcdef LOG: Found assembly by looking in the GAC. LOG: Binding succeeds. Returns assembly from C:\WINDOWS\assembly\GAC_MSIL\MyAssembly\1.0.0.0__b20f4683c1030dbd\MyAssembly.dll. LOG: Assembly is loaded in default load context.
对比度,与当我的配置是在machine.config中,和绑定失败日志:
LOG: This bind starts in default load context. LOG: Using application configuration file: C:\Documents and Settings\jon_scheiding\My Documents\Source\Testing\Test Projects 1\Cmd\bin\Debug\Testers.Cmd.vshost.exe.config LOG: Using machine configuration file from C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\config\machine.config. LOG: Policy not being applied to reference at this time (private, custom, partial, or location-based assembly bind). LOG: Attempting download of new URL file:///C:/Documents and Settings/jon_scheiding/My Documents/Source/Testing/Test Projects 1/Cmd/bin/Debug/MyAssembly.DLL. LOG: Attempting download of new URL file:///C:/Documents and Settings/jon_scheiding/My Documents/Source/Testing/Test Projects 1/Cmd/bin/Debug/MyAssembly/MyAssembly.DLL. LOG: Attempting download of new URL file:///C:/Documents and Settings/jon_scheiding/My Documents/Source/Testing/Test Projects 1/Cmd/bin/Debug/MyAssembly.EXE. LOG: Attempting download of new URL file:///C:/Documents and Settings/jon_scheiding/My Documents/Source/Testing/Test Projects 1/Cmd/bin/Debug/MyAssembly/MyAssembly.EXE. LOG: All probing URLs attempted and failed.
这个问题似乎是第四行中,“没有被应用政策此时引用”。不过,我可以对这个消息意味着什么,或者如何解决它很少发现的文档。
我怎样才能认识到我的<运行>元素的框架?
提前感谢!
解决方案
该框架将无法读取的machine.config qualifyAssebmly配置,它只从应用程序配置文件读取它。
框架并识别您的runtim元素,但它不承认qualifyAssembly元素。
其他提示
我回来这需要很久以后,因为我们有一些组件在GAC之类的东西NHibernate的需要来解决这些问题。而不是增加所有这些qualifyAssembly元素,每一个的app.config,下面的代码可以让我们将它们添加到我们的machine.config。
using System;
using System.Collections.Generic;
using System.Configuration;
using System.IO;
using System.Reflection;
using System.Xml;
using System.Xml.XPath;
namespace MyNamespace {
/// <summary>
/// Implements <see cref="IDisposable"/> to provide a scope for resolving
/// assemblies described in the machine.config file with
/// <qualifyAssembly> elements.
/// </summary>
/// <remarks>
/// Because the framework only respects <qualifyAssembly> at the
/// application configuration level, this class provides similar
/// functionality for this element at the machine configuration level.
/// You can wrap a new instance of this class in a <b>using</b> statement
/// to get resolution within a specific scope; or, you can call the
/// <see cref="AssemblyResolver.Attach()"/> method to get
/// resolution for the lifetime of the current <see cref="AppDomain"/>.
/// </remarks>
public sealed class AssemblyResolver : IDisposable {
#region Private fields and implementation
private static Dictionary<string, string> _qualifiedNames;
private static Assembly ResolveAssembly(object sender, ResolveEventArgs args) {
if(_qualifiedNames == null) {
//
// Lazily initialize short/long name mappings.
//
_qualifiedNames = BuildQualifiedNameList();
}
if(!_qualifiedNames.ContainsKey(args.Name)) {
return null;
}
try {
return Assembly.Load(_qualifiedNames[args.Name]);
}
catch(FileNotFoundException) {
//
// TODO: Should this exception be propogated?
// It probably should not be hidden from the consumer
// since it likely indicates a configuration error.
//
return null;
}
}
private static Dictionary<string, string> BuildQualifiedNameList() {
var dict = new Dictionary<string, string>(StringComparer.InvariantCultureIgnoreCase);
//
// Get runtime XML data
//
var xml = GetConfigXml(GetMachineRuntimeSection());
if(xml == null) {
return dict;
}
//
// Iterate the qualifyAssembly elements and register in the list
//
var navigator = xml.CreateNavigator();
foreach(XPathNavigator qualifyAssembly in navigator.Select("runtime/asm:assemblyBinding/asm:qualifyAssembly", CreateNamespaceManager())) {
dict.Add(
qualifyAssembly.GetAttribute("partialName", string.Empty),
qualifyAssembly.GetAttribute("fullName", string.Empty));
}
return dict;
}
private static ConfigurationSection GetMachineRuntimeSection() {
System.Configuration.Configuration machineConfig = ConfigurationManager.OpenMachineConfiguration();
return machineConfig.GetSection("runtime") as ConfigurationSection;
}
private static IXPathNavigable GetConfigXml(ConfigurationSection runtimeSection) {
var ignoreSection = runtimeSection as IgnoreSection;
if(ignoreSection == null) {
return null;
}
//
// Cheat via Reflection to get the XML content of the config
// section.
//
FieldInfo field = typeof(IgnoreSection).GetField("_rawXml", BindingFlags.Instance | BindingFlags.NonPublic);
string rawXml = (string)field.GetValue(ignoreSection);
return new XPathDocument(new StringReader(rawXml));
}
private static IXmlNamespaceResolver CreateNamespaceManager() {
var nsmgr = new XmlNamespaceManager(new NameTable());
nsmgr.AddNamespace("asm", "urn:schemas-microsoft-com:asm.v1");
return nsmgr;
}
#endregion
/// <summary>
/// Creates a new <see cref="AssemblyResolver"/>.
/// </summary>
public AssemblyResolver() {
AppDomain.CurrentDomain.AssemblyResolve += new ResolveEventHandler(ResolveAssembly);
}
/// <summary>
/// Removes the current <see cref="AssemblyResolver"/>
/// from the <see cref="AppDomain"/>.
/// </summary>
public void Dispose() {
AppDomain.CurrentDomain.AssemblyResolve -= new ResolveEventHandler(ResolveAssembly);
GC.SuppressFinalize(this);
}
/// <summary>
/// Provides qualified assembly resolution for the lifetime of the
/// current <see cref="AppDomain"/>.
/// </summary>
public static void Attach() {
Attach(AppDomain.CurrentDomain);
}
/// <summary>
/// Provides qualified assembly resolution for the lifetime of an
/// <see cref="AppDomain"/>.
/// </summary>
/// <param name="appDomain">
/// The <see cref="AppDomain"/> to service.
/// </param>
public static void Attach(AppDomain appDomain) {
appDomain.AssemblyResolve += new ResolveEventHandler(ResolveAssembly);
}
}
}
在大多数情况下,我们限制它的范围,通过使用这样的:
using(new AssemblyResolver()) {
//
// NHibernate initialization or whatever
//
}
它也可以在应用程序启动时或代码global.asax中被使用,并且持续该应用的生命周期,如下所示:
AssemblyResolver.Attach();
//
// or
//
AssemblyResolver.Attach(AppDomain.CurrentDomain);
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