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

定义

在对类型的解析失败时发生。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 

实现

属性

示例

下面的示例演示TypeResolve事件。The following sample demonstrates the TypeResolve event.

若要运行此代码示例,必须提供完全限定的程序集名称。For this code example to run, you must provide the fully qualified assembly name. 有关如何获取完全限定的程序集名称的信息,请参阅程序集名称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".
'

注解

TypeResolve公共语言运行时无法确定可创建请求类型的程序集时,将发生此事件。The TypeResolve event occurs when the common language runtime is unable to determine the assembly that can create the requested type. 如果类型是在动态程序集中定义的,或者该类型未在动态程序集中定义,但运行时不知道在哪个程序集中定义了该类型,则可能会发生这种情况。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. 当使用未用程序集Type.GetType名称限定的类型名称调用时,可能会出现后一种情况。The latter situation can occur when Type.GetType is called with a type name that is not qualified with the assembly name.

ResolveEventHandler事件的可尝试查找和创建类型。The ResolveEventHandler for this event can attempt to locate and create the type.

但是,如果TypeResolve运行时知道在某些程序集中找不到类型,则不会发生该事件。However, the TypeResolve event does not occur if the runtime knows it is not possible to find a type in certain assemblies. 例如,如果在静态程序集中找不到该类型,则不会发生此事件,因为运行时知道类型不能动态添加到静态程序集。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.

.NET Framework 4.NET Framework 4从开始ResolveEventArgs.RequestingAssembly ,属性包含请求该类型的程序集。Beginning with the .NET Framework 4.NET Framework 4, the ResolveEventArgs.RequestingAssembly property contains the assembly that requested the type. 有关详细信息,请参阅 ResolveEventArgs.RequestingAssemblyFor more information, see ResolveEventArgs.RequestingAssembly.

若要为此事件注册事件处理程序,你必须具有所需的权限, SecurityException否则将引发。To register an event handler for this event, you must have the required permissions, or a SecurityException is thrown.

有关处理事件的详细信息, 请参阅处理和引发事件For more information about handling events, see Handling and Raising Events.

安全性

SecurityCriticalAttribute
需要对直接调用方的完全信任。requires full trust for the immediate caller. 部分受信任的或透明的代码不能使用此成员。This member cannot be used by partially trusted or transparent code.

适用于

另请参阅