AppDomain.TypeResolve Zdarzenie

Definicja

Przestrzeń nazw:

System

Zestaw:

System.Runtime.dll

Źródło:

AppDomain.cs

Występuje, gdy rozpoznawanie typu kończy się niepowodzeniem.

public:
 event ResolveEventHandler ^ TypeResolve;

public event ResolveEventHandler? TypeResolve;

member this.TypeResolve : ResolveEventHandler 

Public Custom Event TypeResolve As ResolveEventHandler 

Typ zdarzenia

ResolveEventHandler

Przykłady

W poniższym przykładzie pokazano TypeResolve zdarzenie.

Aby ten przykładowy kod zadziałał, należy podać w pełni kwalifikowaną nazwę zestawu. Aby uzyskać informacje na temat uzyskiwania w pełni kwalifikowanej nazwy zestawu, zobacz Nazwy zestawów.

#using <System.dll>
#using <System.Windows.Forms.dll>
#using <System.Drawing.dll>

using namespace System;
using namespace System::Reflection;
using namespace System::Reflection::Emit;

ref class Test
{
private:
    static Assembly^ HandleTypeResolve(Object^ sender, ResolveEventArgs^ args) 
    {
        Console::WriteLine("TypeResolve event handler.");

        // Save the dynamic assembly, and then load it using its
        // display name. Return the loaded assembly.
        //
        ab->Save(moduleName);
        return Assembly::Load(ab->FullName); 
    }

    // For this code example, the following information needs to be
    // available to both Demo and the HandleTypeResolve event
    // handler:
    static AssemblyBuilder^ ab;
    static String^ moduleName;

public:
    static void Demo() 
    {
        AppDomain^ currDom = AppDomain::CurrentDomain;

        // Create a dynamic assembly with one module, to be saved to 
        // disk (AssemblyBuilderAccess::Save).
        // 
        AssemblyName^ aName = gcnew AssemblyName();
        aName->Name = "Transient";
        moduleName = aName->Name + ".dll";
        ab = currDom->DefineDynamicAssembly(aName,
            AssemblyBuilderAccess::Save);
        ModuleBuilder^ mb = ab->DefineDynamicModule(aName->Name, moduleName);

        // The dynamic assembly has just one dummy type, to demonstrate
        // type resolution.
        TypeBuilder^ tb = mb->DefineType("Example");
        tb->CreateType();


        // First, try to load the type without saving the dynamic 
        // assembly and without hooking up the TypeResolve event. The
        // type cannot be loaded.
        try
        {
            Type^ temp = Type::GetType("Example", true);
            Console::WriteLine("Loaded type {0}.", temp);
        }
        catch (TypeLoadException^)
        {
            Console::WriteLine("Loader could not resolve the type.");
        }

        // Hook up the TypeResolve event.
        //      
        currDom->TypeResolve += 
            gcnew ResolveEventHandler(HandleTypeResolve);

        // Now try to load the type again. The TypeResolve event is 
        // raised, the dynamic assembly is saved, and the dummy type is
        // loaded successfully. Display it to the console, and create
        // an instance.
        Type^ t = Type::GetType("Example", true);
        Console::WriteLine("Loaded type \"{0}\".", t);
        Object^ o = Activator::CreateInstance(t);
    }
};

void main()
{
    Test::Demo();
}

/* This code example produces the following output:

Loader could not resolve the type.
TypeResolve event handler.
Loaded type "Example".
 */

using System;
using System.Reflection;
using System.Reflection.Emit;

class Test
{
    // For this code example, the following information needs to be
    // available to both Main and the HandleTypeResolve event
    // handler:
    private static AssemblyBuilder ab;
    private static string moduleName;

    public static void Main()
    {
        AppDomain currDom = AppDomain.CurrentDomain;

        // Create a dynamic assembly with one module, to be saved to
        // disk (AssemblyBuilderAccess.Save).
        //
        AssemblyName aName = new AssemblyName();
        aName.Name = "Transient";
        moduleName = aName.Name + ".dll";
        ab = currDom.DefineDynamicAssembly(aName,
            AssemblyBuilderAccess.Save);
        ModuleBuilder mb = ab.DefineDynamicModule(aName.Name, moduleName);

        // The dynamic assembly has just one dummy type, to demonstrate
        // type resolution.
        TypeBuilder tb = mb.DefineType("Example");
        tb.CreateType();

        // First, try to load the type without saving the dynamic
        // assembly and without hooking up the TypeResolve event. The
        // type cannot be loaded.
        try
        {
            Type temp = Type.GetType("Example", true);
            Console.WriteLine("Loaded type {0}.", temp);
        }
        catch (TypeLoadException)
        {
            Console.WriteLine("Loader could not resolve the type.");
        }

        // Hook up the TypeResolve event.
        //
        currDom.TypeResolve +=
            new ResolveEventHandler(HandleTypeResolve);

        // Now try to load the type again. The TypeResolve event is
        // raised, the dynamic assembly is saved, and the dummy type is
        // loaded successfully. Display it to the console, and create
        // an instance.
        Type t = Type.GetType("Example", true);
        Console.WriteLine("Loaded type \"{0}\".", t);
        Object o = Activator.CreateInstance(t);
    }

    static Assembly HandleTypeResolve(object sender, ResolveEventArgs args)
    {
        Console.WriteLine("TypeResolve event handler.");

        // Save the dynamic assembly, and then load it using its
        // display name. Return the loaded assembly.
        //
        ab.Save(moduleName);
        return Assembly.Load(ab.FullName);
    }
}

/* This code example produces the following output:

Loader could not resolve the type.
TypeResolve event handler.
Loaded type "Example".
 */

open System
open System.Reflection
open System.Reflection.Emit

let currDom = AppDomain.CurrentDomain

// Create a dynamic assembly with one module, to be saved to
// disk (AssemblyBuilderAccess.Save).
//
let aName = AssemblyName()
aName.Name <- "Transient"
let moduleName = aName.Name + ".dll"
let ab = currDom.DefineDynamicAssembly(aName, AssemblyBuilderAccess.Save)

let handleTypeResolve _ _ =
    printfn "TypeResolve event handler."

    // Save the dynamic assembly, and then load it using its
    // display name. Return the loaded assembly.
    ab.Save moduleName
    Assembly.Load ab.FullName

let mb = ab.DefineDynamicModule(aName.Name, moduleName)

// The dynamic assembly has just one dummy type, to demonstrate
// type resolution.
let tb = mb.DefineType "Example"
tb.CreateType() |> ignore

// First, try to load the type without saving the dynamic
// assembly and without hooking up the TypeResolve event. The
// type cannot be loaded.
try
    let temp = Type.GetType("Example", true)
    printfn $"Loaded type {temp}."
with :? TypeLoadException ->
    printfn "Loader could not resolve the type."

// Hook up the TypeResolve event.
//
currDom.add_TypeResolve(ResolveEventHandler handleTypeResolve)

// Now try to load the type again. The TypeResolve event is
// raised, the dynamic assembly is saved, and the dummy type is
// loaded successfully. Display it to the console, and create
// an instance.
let t = Type.GetType("Example", true)
printfn $"Loaded type \"{t}\"."
let o = Activator.CreateInstance t

(* This code example produces the following output:

Loader could not resolve the type.
TypeResolve event handler.
Loaded type "Example".
 *)

Option Strict On
Option Explicit On

Imports System.Reflection
Imports System.Reflection.Emit

Module Test

    ' For this code example, the following information needs to be
    ' available to both Main and the HandleTypeResolve event
    ' handler:
    Private ab As AssemblyBuilder
    Private moduleName As String

    Sub Main() 
    
        Dim currDom As AppDomain = AppDomain.CurrentDomain

        ' Create a dynamic assembly with one module, to be saved to 
        ' disk (AssemblyBuilderAccess.Save).
        ' 
        Dim aName As AssemblyName = new AssemblyName()
        aName.Name = "Transient"
        moduleName = aName.Name + ".dll"
        ab = currDom.DefineDynamicAssembly(aName, _
            AssemblyBuilderAccess.Save)
        Dim mb As ModuleBuilder = _
            ab.DefineDynamicModule(aName.Name, moduleName)

        ' The dynamic assembly has just one dummy type, to demonstrate
        ' type resolution.
        Dim tb As TypeBuilder = mb.DefineType("Example")
        tb.CreateType()


        ' First, try to load the type without saving the dynamic 
        ' assembly and without hooking up the TypeResolve event. The
        ' type cannot be loaded.
        Try
            Dim temp As Type = Type.GetType("Example", true)
            Console.WriteLine("Loaded type {0}.", temp)
        Catch ex As TypeLoadException
            Console.WriteLine("Loader could not resolve the type.")
        End Try

        ' Hook up the TypeResolve event.
        '      
        AddHandler currDom.TypeResolve, AddressOf HandleTypeResolve

        ' Now try to load the type again. The TypeResolve event is 
        ' raised, the dynamic assembly is saved, and the dummy type is
        ' loaded successfully. Display it to the console, and create
        ' an instance.
        Dim t As Type = Type.GetType("Example", true)
        Console.WriteLine("Loaded type ""{0}"".", t)
        Dim o As Object = Activator.CreateInstance(t)
    End Sub

    Private Function HandleTypeResolve(ByVal sender As Object, _
        ByVal e As ResolveEventArgs) As [Assembly]
    
        Console.WriteLine("TypeResolve event handler.")

        ' Save the dynamic assembly, and then load it using its
        ' display name. Return the loaded assembly.
        '
        ab.Save(moduleName)
        Return [Assembly].Load(ab.FullName) 
    End Function
End Module

' This code example produces the following output:
'
'Loader could not resolve the type.
'TypeResolve event handler.
'Loaded type "Example".
'

Uwagi

Zdarzenie TypeResolve występuje, gdy środowisko uruchomieniowe języka wspólnego nie może określić zestawu, który może utworzyć żądany typ. Taka sytuacja może wystąpić, jeśli typ jest zdefiniowany w zestawie dynamicznym lub typ nie jest zdefiniowany w zestawie dynamicznym, ale środowisko uruchomieniowe nie wie, w którym zestawie jest zdefiniowany typ. Druga sytuacja może wystąpić, gdy Type.GetType jest wywoływana z nazwą typu, która nie jest kwalifikowana z nazwą zestawu.

Element ResolveEventHandler dla tego zdarzenia może podjąć próbę zlokalizowania i utworzenia typu.

Jednak zdarzenie nie występuje, jeśli środowisko uruchomieniowe wie, TypeResolve że nie można znaleźć typu w niektórych zestawach. Na przykład to zdarzenie nie występuje, jeśli typ nie zostanie znaleziony w zestawie statycznym, ponieważ środowisko uruchomieniowe nie może dynamicznie dodawać typów do zestawów statycznych.

Począwszy od .NET Framework 4, właściwość zawiera zestaw, ResolveEventArgs.RequestingAssembly który zażądał typu. Aby uzyskać więcej informacji, zobacz ResolveEventArgs.RequestingAssembly.

Aby zarejestrować program obsługi zdarzeń dla tego zdarzenia, musisz mieć wymagane uprawnienia lub SecurityException jest zgłaszany.

Aby uzyskać więcej informacji na temat obsługi zdarzeń, zobacz Obsługa i podnoszenie zdarzeń.

Zobacz też

• RequestingAssembly