AppDomain.AssemblyResolve Händelse

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 

Händelsetyp

Implementeringar

Attribut

SecurityCriticalAttribute

Exempel

Följande exempel visar händelsen AssemblyResolve .

För att det här kodexemplet ska köras måste du ange det fullständigt kvalificerade sammansättningsnamnet. Information om hur du hämtar det fullständigt kvalificerade sammansättningsnamnet finns i Sammansättningsnamn.

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

Kommentarer

Det är den här händelsens ResolveEventHandler ansvar att returnera sammansättningen som anges av ResolveEventArgs.Name egenskapen eller att returnera null om sammansättningen inte känns igen. Sammansättningen måste läsas in i en körningskontext. Om den läses in i reflektionskontexten misslyckas belastningen som orsakade att händelsen utlöstes.

Mer information om hur du använder den här händelsen finns i Lösa sammansättningsbelastningar.

Från och med .NET Framework 4 returnerar egenskapen ResolveEventArgs.RequestingAssembly den sammansättning som begärde den sammansättningsbelastning som inte kunde matchas. Inläsaren kanske till exempel inte kan läsa in ett beroende av den begärande sammansättningen eftersom den begärande sammansättningen och dess beroende inte finns i avsökningssökvägen. Att känna till identiteten för den begärande sammansättningen kan vara användbart för att hitta beroendet eller för att identifiera rätt version, om mer än en version av beroendet är tillgänglig. Mer information finns i ResolveEventArgs.RequestingAssembly.

För den här händelsen ResolveEventArgs.Name returnerar egenskapen sammansättningsnamnet innan principen tillämpas.

Mer information om hur du hanterar händelser finns i Hantera och höja händelser.

Se även

• RequestingAssembly
• Lösa monteringsbelastningar