AppDomain.AssemblyResolve Событие

Определение

Происходит, когда разрешение сборки завершается неудачей.Occurs when the resolution of an assembly fails.

public:
 event ResolveEventHandler ^ AssemblyResolve;
public:
 virtual event ResolveEventHandler ^ AssemblyResolve;
public event ResolveEventHandler AssemblyResolve;
[add: System.Security.SecurityCritical]
[remove: System.Security.SecurityCritical]
public event ResolveEventHandler AssemblyResolve;
member this.AssemblyResolve : ResolveEventHandler 
Public Custom Event AssemblyResolve As ResolveEventHandler 

Реализации

Атрибуты

Примеры

В следующем примере демонстрируется событие AssemblyResolve.The following sample demonstrates the AssemblyResolve event.

Для выполнения этого примера кода необходимо указать полное имя сборки.For this code example to run, you must provide the fully qualified assembly name. Дополнительные сведения о получении полного имени сборки см. в разделе имена сборок.For information about how to obtain the fully qualified assembly name, see Assembly Names.

public ref class MyType
{
public:
    MyType()
    {
        Console::WriteLine();
        Console::WriteLine("MyType instantiated!");
    }
};

class Test
{
public:
    static void Main()
    {
        AppDomain^ currentDomain = AppDomain::CurrentDomain;

        // This call will fail to create an instance of MyType since the
        // assembly resolver is not set
        InstantiateMyTypeFail(currentDomain);

        currentDomain->AssemblyResolve += gcnew ResolveEventHandler(&Test::MyResolveEventHandler);

        // This call will succeed in creating an instance of MyType since the
        // assembly resolver is now set.
        InstantiateMyTypeFail(currentDomain);

        // This call will succeed in creating an instance of MyType since the
        // assembly name is valid.
        InstantiateMyTypeSucceed(currentDomain);
    }

private:
    static void InstantiateMyTypeFail(AppDomain^ domain)
    {
        // Calling InstantiateMyType will always fail since the assembly info
        // given to CreateInstance is invalid.
        try
        {
            // You must supply a valid fully qualified assembly name here.
            domain->CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyType");
        }
        catch (Exception^ e)
        {
            Console::WriteLine();
            Console::WriteLine(e->Message);
        }
    }

    static void InstantiateMyTypeSucceed(AppDomain^ domain)
    {
        try
        {
            String^ asmname = Assembly::GetCallingAssembly()->FullName;
            domain->CreateInstance(asmname, "MyType");
        }
        catch (Exception^ e)
        {
            Console::WriteLine();
            Console::WriteLine(e->Message);
        }
    }

    static Assembly^ MyResolveEventHandler(Object^ sender, ResolveEventArgs^ args)
    {
        Console::WriteLine("Resolving...");
        return MyType::typeid->Assembly;
    }
};

int main()
{
    Test::Main();
}
public class MyType
{
    public MyType()
    {
        Console.WriteLine();
        Console.WriteLine("MyType instantiated!");
    }
}

class Test
{
    public static void Main()
    {
        AppDomain currentDomain = AppDomain.CurrentDomain;

        // This call will fail to create an instance of MyType since the
        // assembly resolver is not set
        InstantiateMyTypeFail(currentDomain);

        currentDomain.AssemblyResolve += new ResolveEventHandler(MyResolveEventHandler);

        // This call will succeed in creating an instance of MyType since the
        // assembly resolver is now set.
        InstantiateMyTypeFail(currentDomain);

        // This call will succeed in creating an instance of MyType since the
        // assembly name is valid.
        InstantiateMyTypeSucceed(currentDomain);
    }

    private static void InstantiateMyTypeFail(AppDomain domain)
    {
        // Calling InstantiateMyType will always fail since the assembly info
        // given to CreateInstance is invalid.
        try
        {
            // You must supply a valid fully qualified assembly name here.
            domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyType");
        }
        catch (Exception e)
        {
            Console.WriteLine();
            Console.WriteLine(e.Message);
        }
    }

    private static void InstantiateMyTypeSucceed(AppDomain domain)
    {
        try
        {
            string asmname = Assembly.GetCallingAssembly().FullName;
            domain.CreateInstance(asmname, "MyType");
        }
        catch (Exception e)
        {
            Console.WriteLine();
            Console.WriteLine(e.Message);
        }
    }

    private static Assembly MyResolveEventHandler(object sender, ResolveEventArgs args)
    {
        Console.WriteLine("Resolving...");
        return typeof(MyType).Assembly;
    }
}
Public Class MyType

    Public Sub New()
        Console.WriteLine()
        Console.WriteLine("MyType instantiated!")
    End Sub

End Class

Class Test

    Public Shared Sub Main()
        Dim currentDomain As AppDomain = AppDomain.CurrentDomain

        ' This call will fail to create an instance of MyType since the
        ' assembly resolver is not set
        InstantiateMyTypeFail(currentDomain)

        AddHandler currentDomain.AssemblyResolve, AddressOf MyResolveEventHandler

        ' This call will succeed in creating an instance of MyType since the
        ' assembly resolver is now set.
        InstantiateMyTypeFail(currentDomain)

        ' This call will succeed in creating an instance of MyType since the
        ' assembly name is valid.
        InstantiateMyTypeSucceed(currentDomain)
    End Sub

    Private Shared Sub InstantiateMyTypeFail(domain As AppDomain)
        ' Calling InstantiateMyType will always fail since the assembly info
        ' given to CreateInstance is invalid.
        Try
            ' You must supply a valid fully qualified assembly name here.
            domain.CreateInstance("Assembly text name, Version, Culture, PublicKeyToken", "MyType")
        Catch e As Exception
            Console.WriteLine()
            Console.WriteLine(e.Message)
        End Try
    End Sub

    Private Shared Sub InstantiateMyTypeSucceed(domain As AppDomain)
        Try
            Dim asmname As String = Assembly.GetCallingAssembly().FullName
            domain.CreateInstance(asmname, "MyType")
        Catch e As Exception
            Console.WriteLine()
            Console.WriteLine(e.Message)
        End Try
    End Sub

    Private Shared Function MyResolveEventHandler(sender As Object, args As ResolveEventArgs) As Assembly
        Console.WriteLine("Resolving...")
        Return GetType(MyType).Assembly
    End Function 'MyResolveEventHandler

End Class

Комментарии

Для получения сборки, указанной свойством ResolveEventArgs.Name, или для возврата значения NULL, если сборка не распознана, отвечает ResolveEventHandler этого события.It is the responsibility of the ResolveEventHandler for this event to return the assembly that is specified by the ResolveEventArgs.Name property, or to return null if the assembly is not recognized. Сборка должна быть загружена в контекст выполнения; при загрузке в контекст, предназначенный только для отражения, нагрузка, вызвавшая это событие, завершается ошибкой.The assembly must be loaded into an execution context; if it is loaded into the reflection-only context, the load that caused this event to be raised fails.

Рекомендации по использованию этого события см. в разделе разрешение загрузки сборок.For guidance on the use of this event, see Resolving Assembly Loads.

Начиная с .NET Framework 4.NET Framework 4свойство ResolveEventArgs.RequestingAssembly возвращает сборку, которая запросила загрузку сборки, которую не удалось разрешить.Beginning with the .NET Framework 4.NET Framework 4, the ResolveEventArgs.RequestingAssembly property returns the assembly that requested the assembly load that could not be resolved. Например, загрузчику может быть невозможно загрузить зависимость запрашивающей сборки, так как запрашивающая сборка и ее зависимость не находятся в пути поиска.For example, the loader might be unable to load a dependency of the requesting assembly because the requesting assembly and its dependency are not in the probing path. Знание идентификации запрашивающей сборки может оказаться полезным при поиске зависимости или при определении правильной версии, если доступна более чем одна версия зависимости.Knowing the identity of the requesting assembly might be useful in locating the dependency or in identifying the correct version, if more than one version of the dependency is available. Дополнительные сведения см. в разделе ResolveEventArgs.RequestingAssembly.For more information, see ResolveEventArgs.RequestingAssembly.

Важно!

Начиная с .NET Framework 4.NET Framework 4, событие ResolveEventHandler вызывается для всех сборок, включая сборки ресурсов.Beginning with the .NET Framework 4.NET Framework 4, the ResolveEventHandler event is raised for all assemblies, including resource assemblies. В более ранних версиях событие не было вызвано для сборок ресурсов.In earlier versions, the event was not raised for resource assemblies. Если операционная система локализована, обработчик может вызываться несколько раз: один раз для каждого языка и региональных параметров в цепочке резервов.If the operating system is localized, the handler might be called multiple times: once for each culture in the fallback chain.

Для этого события свойство ResolveEventArgs.Name возвращает имя сборки перед применением политики.For this event, the ResolveEventArgs.Name property returns the assembly name before policy is applied.

Важно!

Если для этого события зарегистрировано более одного обработчика событий, обработчики событий вызываются по порядку, пока обработчик событий не вернет значение, которое не null.If more than one event handler is registered for this event, the event handlers are called in order until an event handler returns a value that isn't null. Последующие обработчики событий игнорируются.Subsequent event handlers are ignored.

Дополнительные сведения об обработке событий см. в разделе обработка и вызов событий.For more information about handling events, see Handling and Raising Events.

Применяется к

Дополнительно