AppDomain.TypeResolve AppDomain.TypeResolve AppDomain.TypeResolve AppDomain.TypeResolve Event

Определение

Происходит, когда разрешении типа завершается неудачей.Occurs when the resolution of a type fails.

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

Реализации

Атрибуты

Примеры

В следующем примере демонстрируется TypeResolve событие.The following sample demonstrates the TypeResolve 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.

#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".
 */
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".
'

Комментарии

Это TypeResolve событие возникает, когда среде CLR не удается определить сборку, которая может создать запрошенный тип.The TypeResolve event occurs when the common language runtime is unable to determine the assembly that can create the requested type. Это может произойти, если тип определен в динамической сборке или тип не определен в динамической сборке, но среда выполнения не знает, в какой сборке определен тип.This can occur if the type is defined in a dynamic assembly, or the type is not defined in a dynamic assembly but the runtime does not know which assembly the type is defined in. Вторая ситуация может возникнуть при Type.GetType вызове с именем типа, которое не дополнено именем сборки.The latter situation can occur when Type.GetType is called with a type name that is not qualified with the assembly name.

ResolveEventHandler Для этого события можно попытаться выполнить поиск и создать тип.The ResolveEventHandler for this event can attempt to locate and create the type.

Однако TypeResolve событие не происходит, если среда выполнения знает, что невозможно найти тип в определенных сборках.However, the TypeResolve event does not occur if the runtime knows it is not possible to find a type in certain assemblies. Например, это событие не происходит, если тип не найден в статической сборке, так как среда выполнения знает типы, которые нельзя динамически добавить в статические сборки.For example, this event does not occur if the type is not found in a static assembly because the runtime knows types cannot be added dynamically to static assemblies.

Начиная с .NET Framework 4.NET Framework 4 ResolveEventArgs.RequestingAssembly , свойство содержит сборку, которая запросила тип.Beginning with the .NET Framework 4.NET Framework 4, the ResolveEventArgs.RequestingAssembly property contains the assembly that requested the type. Для получения дополнительной информации см. ResolveEventArgs.RequestingAssembly.For more information, see ResolveEventArgs.RequestingAssembly.

Чтобы зарегистрировать обработчик событий для этого события, необходимо иметь необходимые разрешения или SecurityException исключение.To register an event handler for this event, you must have the required permissions, or a SecurityException is thrown.

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

Безопасность

SecurityCriticalAttribute
требуется полное доверие для немедленного вызывающего объекта.requires full trust for the immediate caller. Этот член не может использоваться частично доверенным или прозрачным кодом.This member cannot be used by partially trusted or transparent code.

Применяется к

Дополнительно