AppDomain.AssemblyResolve Evento

public:
 event ResolveEventHandler ^ AssemblyResolve;

public:
 virtual event ResolveEventHandler ^ AssemblyResolve;

public event ResolveEventHandler? AssemblyResolve;

public event ResolveEventHandler AssemblyResolve;

[add: System.Security.SecurityCritical]
[remove: System.Security.SecurityCritical]
public event ResolveEventHandler AssemblyResolve;

member this.AssemblyResolve : ResolveEventHandler 

[<add: System.Security.SecurityCritical>]
[<remove: System.Security.SecurityCritical>]
member this.AssemblyResolve : ResolveEventHandler 

Public Custom Event AssemblyResolve As ResolveEventHandler 

Tipo evento

Implementazioni

Attributi

SecurityCriticalAttribute

Esempio

L'esempio seguente illustra l'evento AssemblyResolve .

Per eseguire questo esempio di codice, è necessario specificare il nome dell'assembly completo. Per informazioni su come ottenere il nome dell'assembly completo, vedere Nomi di assembly.

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 AssemblyResolveSnippet
{
    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;
    }
}

type MyType() =
    do
        printfn "\nMyType instantiated!"

let instantiateMyTypeFail (domain: 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")
        |> ignore
    with e ->
        printfn $"\n{e.Message}"

let instantiateMyTypeSucceed (domain: AppDomain) =
    try
        let asmname = Assembly.GetCallingAssembly().FullName
        domain.CreateInstance(asmname, "MyType")
        |> ignore
    with e ->
        printfn $"\n{e.Message}"

let myResolveEventHandler _ _ =
    printfn "Resolving..."
    typeof<MyType>.Assembly


let currentDomain = AppDomain.CurrentDomain

// This call will fail to create an instance of MyType since the
// assembly resolver is not set
instantiateMyTypeFail currentDomain

currentDomain.add_AssemblyResolve (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

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

Commenti

È responsabilità dell'evento ResolveEventHandler restituire l'assembly specificato dalla ResolveEventArgs.Name proprietà o restituire Null se l'assembly non viene riconosciuto. L'assembly deve essere caricato in un contesto di esecuzione; se viene caricato nel contesto di sola reflection, il carico che ha causato l'esito negativo di questo evento.

Per indicazioni sull'uso di questo evento, vedere Risoluzione dei carichi di assembly.

A partire da .NET Framework 4, la ResolveEventArgs.RequestingAssembly proprietà restituisce l'assembly che ha richiesto il carico dell'assembly che non è stato possibile risolvere. Ad esempio, il caricatore potrebbe non essere in grado di caricare una dipendenza dell'assembly di richiesta perché l'assembly di richiesta e la relativa dipendenza non si trovano nel percorso di probing. La conoscenza dell'identità dell'assembly di richiesta potrebbe essere utile nell'individuazione della dipendenza o nell'identificazione della versione corretta, se è disponibile più di una versione della dipendenza. Per altre informazioni, vedere ResolveEventArgs.RequestingAssembly.

Per questo evento, la ResolveEventArgs.Name proprietà restituisce il nome dell'assembly prima dell'applicazione dei criteri.

Per ulteriori informazioni sulla gestione degli eventi, consultare gestione e generazione di eventi.

Si applica a

Vedi anche

• RequestingAssembly
• Risolvere i caricamenti di assembly