SerializationInfoEnumerator Klasse

Definition

Stellt ein von Formatierungsprogrammen einfach zu verwendendes Verfahren für die Analyse der Daten in der SerializationInfo bereit.Provides a formatter-friendly mechanism for parsing the data in SerializationInfo. Diese Klasse kann nicht vererbt werden.This class cannot be inherited.

public ref class SerializationInfoEnumerator sealed : System::Collections::IEnumerator
[System.Runtime.InteropServices.ComVisible(true)]
public sealed class SerializationInfoEnumerator : System.Collections.IEnumerator
type SerializationInfoEnumerator = class
    interface IEnumerator
Public NotInheritable Class SerializationInfoEnumerator
Implements IEnumerator
Vererbung
SerializationInfoEnumerator
Attribute
Implementiert

Beispiele

Im folgenden Codebeispiel wird gezeigt, wie die FormatterServices -Klasse verwendet wird, um ein Objekt, das von der Basisklasse nicht implementiert ISerializable wird,, aber von der abgeleiteten Klasse, ordnungsgemäß zu serialisieren oder zu deserialisieren.The following code example shows how to use the FormatterServices class in order to properly serialize or deserialize an object where the base class does not implement ISerializable but the derived class does.

using namespace System;
using namespace System::IO;
using namespace System::Runtime::Serialization;
using namespace System::Runtime::Serialization::Formatters;
using namespace System::Runtime::Serialization::Formatters::Binary;
using namespace System::Reflection;
using namespace System::Security::Permissions;

// Person is a serializable base class.
[Serializable]
public ref class Person
{
private:
    String^ title;

public:
    Person(String^ title)
    {
        this->title = title;
    }

public:
    virtual String^ ToString() override
    {
        return String::Format("{0}", title);
    }
};

// Employee is a serializable class derived from Person.
[Serializable]
public ref class Employee : public Person
{
private:
    String^ title;

public:
    Employee(String^ title) : Person("Person")
    {
        this->title = title;
    }

public:
    virtual String^ ToString() override
    {
        return String::Format("{0} -> {1}", title, Person::ToString());
    }
};

// Manager is a serializable and ISerializable class derived from Employee.
[Serializable]
ref class Manager : public Employee, public ISerializable
{
private:
    String^ title;

public:
    Manager() : Employee("Employee")
    {
        this->title = "Manager";
    }

public:
    [SecurityPermission(SecurityAction::Demand, SerializationFormatter = true)]
    virtual void GetObjectData(SerializationInfo^ info, StreamingContext context)
    {
        // Serialize the desired values for this class.
        info->AddValue("title", title);

        // Get the set of serializable members for the class and base classes.
        Type^ thisType = this->GetType();
        array<MemberInfo^>^ serializableMembers =
            FormatterServices::GetSerializableMembers(thisType, context);

        // Serialize the base class's fields to the info object.
        for each (MemberInfo^ serializableMember in serializableMembers)
        {
            // Do not serialize fields for this class.
            if (serializableMember->DeclaringType != thisType)
            {
                // Skip this field if it is marked NonSerialized.
                if (!(Attribute::IsDefined(serializableMember,
                    NonSerializedAttribute::typeid)))
                {
                    // Get the value of this field and add it to the
                    // SerializationInfo object.
                    info->AddValue(serializableMember->Name,
                        ((FieldInfo^)serializableMember)->GetValue(this));
                }
            }
        }

        // Call the method below to see the contents of the
        // SerializationInfo object.
        DisplaySerializationInfo(info);
    }

private:
    static void DisplaySerializationInfo(SerializationInfo^ info)
    {
        Console::WriteLine("Values in the SerializationInfo:");
        for each (SerializationEntry^ infoEntry in info)
        {
            Console::WriteLine("Name={0}, ObjectType={1}, Value={2}",
                infoEntry->Name, infoEntry->ObjectType, infoEntry->Value);
        }
    }

protected:
    Manager(SerializationInfo^ info,
        StreamingContext context) : Employee(nullptr)
    {
        // Get the set of serializable members for the class and base classes.
        Type^ thisType = this->GetType();
        array<MemberInfo^>^ serializableMembers =
            FormatterServices::GetSerializableMembers(thisType, context);

        // Deserialize the base class's fields from the info object.
        for each (MemberInfo^ serializableMember in serializableMembers)
        {
            // Do not deserialize fields for this class.
            if (serializableMember->DeclaringType != thisType)
            {
                // For easier coding, treat the member as a FieldInfo object
                FieldInfo^ fieldInformation = (FieldInfo^)serializableMember;

                // Skip this field if it is marked NonSerialized.
                if (!(Attribute::IsDefined(serializableMember,
                    NonSerializedAttribute::typeid)))
                {
                    // Get the value of this field from the
                    // SerializationInfo object.
                    fieldInformation->SetValue(this,
                        info->GetValue(fieldInformation->Name,
                        fieldInformation->FieldType));
                }
            }
        }

        // Deserialize the values that were serialized for this class.
        title = info->GetString("title");
    }

public:
    virtual String^ ToString() override
    {
        return String::Format("{0} -> {1}", title, Employee::ToString());
    }
};

int main()
{
    Stream^ stream = gcnew MemoryStream();
    IFormatter^ formatter = gcnew BinaryFormatter();
    Manager^ m = gcnew Manager();
    Console::WriteLine(m->ToString());
    formatter->Serialize(stream, m);

    stream->Position = 0;
    m = (Manager^) formatter->Deserialize(stream);
    Console::WriteLine(m->ToString());
}

// This code produces the following output.
//
//  Manager -> Employee -> Person
//  Values in the SerializaitonInfo:
//  Name=title, ObjectType=System.String, Value=Manager
//  Name=Employee+title, ObjectType=System.String, Value=Employee
//  Name=Person+title, ObjectType=System.String, Value=Person
//  Manager -> Employee -> Person
using System;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters;
using System.Runtime.Serialization.Formatters.Binary;
using System.Reflection;
using System.Security.Permissions;


// Person is a serializable base class.
[Serializable]
public class Person
{
    private String title;

    public Person(String title)
    {
        this.title = title;
    }

    public override String ToString()
    {
        return String.Format("{0}", title);
    }
}

// Employee is a serializable class derived from Person.
[Serializable]
public class Employee : Person
{
    private String title;

    public Employee(String title) : base("Person")
    {
        this.title = title;
    }

    public override String ToString()
    {
        return String.Format("{0} -> {1}", title, base.ToString());
    }
}

// Manager is a serializable and ISerializable class derived from Employee.
[Serializable]
public class Manager : Employee, ISerializable
{
    private String title;

    public Manager() : base("Employee") 
    {
        this.title = "Manager";
    }

    [SecurityPermission(SecurityAction.Demand, SerializationFormatter = true)]
    public void GetObjectData(SerializationInfo info, StreamingContext context)
    {

        // Serialize the desired values for this class.
        info.AddValue("title", title);

        // Get the set of serializable members for the class and base classes.
        Type thisType = this.GetType();
        MemberInfo[] mi = FormatterServices.GetSerializableMembers(thisType, context);

        // Serialize the base class's fields to the info object.
        for (Int32 i = 0; i < mi.Length; i++)
        {
            // Do not serialize fields for this class.
            if (mi[i].DeclaringType == thisType) continue;

            // Skip this field if it is marked NonSerialized.
            if (Attribute.IsDefined(mi[i], typeof(NonSerializedAttribute))) continue;
         
            // Get the value of this field and add it to the SerializationInfo object.
            info.AddValue(mi[i].Name, ((FieldInfo) mi[i]).GetValue(this));
        }

        // Call the method below to see the contents of the SerializationInfo object.
        DisplaySerializationInfo(info);
    }
 
    private void DisplaySerializationInfo(SerializationInfo info)
    {
        SerializationInfoEnumerator e = info.GetEnumerator();
        Console.WriteLine("Values in the SerializationInfo:");
        while (e.MoveNext())
        {
            Console.WriteLine("Name={0}, ObjectType={1}, Value={2}", e.Name, e.ObjectType, e.Value);
        }
    }

    [SecurityPermissionAttribute(SecurityAction.Demand, Flags=SecurityPermissionFlag.SerializationFormatter)]
    protected Manager(SerializationInfo info, StreamingContext context) : base(null)
    {

        // Get the set of serializable members for the class and base classes.
        Type thisType = this.GetType();
        MemberInfo[] mi = FormatterServices.GetSerializableMembers(thisType, context);

        // Deserialize the base class's fields from the info object.
        for (Int32 i = 0; i < mi.Length; i++)
        {
            // Do not deserialize fields for this class.
            if (mi[i].DeclaringType == thisType) continue;

            // For easier coding, treat the member as a FieldInfo object
            FieldInfo fi = (FieldInfo) mi[i];

            // Skip this field if it is marked NonSerialized.
            if (Attribute.IsDefined(mi[i], typeof(NonSerializedAttribute))) continue;

            // Get the value of this field from the SerializationInfo object.
            fi.SetValue(this, info.GetValue(fi.Name, fi.FieldType));
        }

        // Deserialize the values that were serialized for this class.
        title = info.GetString("title");
    }

    public override String ToString()
    {
        return String.Format("{0} -> {1}", title, base.ToString());
    }
}


public sealed class App
{
    public static void Main()
    {
        Run();
    }

    public static void Run()
    {
        using (Stream stream = new MemoryStream())
    {
            IFormatter formatter = new BinaryFormatter();
            Manager m = new Manager();
            Console.WriteLine(m.ToString());
            formatter.Serialize(stream, m);

            stream.Position = 0;
            m = (Manager) formatter.Deserialize(stream);
            Console.WriteLine(m.ToString());
        }
    }
}
// This code produces the following output.
//
//  Manager -> Employee -> Person
//  Values in the SerializaitonInfo:
//  Name=title, ObjectType=System.String, Value=Manager
//  Name=Employee+title, ObjectType=System.String, Value=Employee
//  Name=Person+title, ObjectType=System.String, Value=Person
//  Manager -> Employee -> Person

Hinweise

Bei der aktuellen Klasse handelt es sich um einen Standardenumerator, der die SerializationInfoin gespeicherten Werte analysiert.The current class is a standard enumerator that parses over the values stored in SerializationInfo. Anstatt die Werte aufzuzeichnen, behält der SerializationInfoEnumerator Zeiger auf die Element Variablen SerializationInfo des-Elements bei, das es erstellt hat.Instead of recording the values, the SerializationInfoEnumerator keeps pointers to the member variables of the SerializationInfo that created it.

Diese Klasse folgt dem IEnumerator -Mechanismus.This class follows the IEnumerator mechanism.

Eigenschaften

Current

Ruft das Element ab, das gerade überprüft wird.Gets the item currently being examined.

Name

Ruft den Namen des Elements ab, das gerade überprüft wird.Gets the name for the item currently being examined.

ObjectType

Ruft den Typ des Elements ab, das gerade überprüft wird.Gets the type of the item currently being examined.

Value

Ruft den Wert des Elements ab, das gerade überprüft wird.Gets the value of the item currently being examined.

Methoden

Equals(Object)

Ermittelt, ob das angegebene Objekt und das aktuelle Objekt gleich sind.Determines whether the specified object is equal to the current object.

(Geerbt von Object)
GetHashCode()

Dient als die Standard-HashfunktionServes as the default hash function.

(Geerbt von Object)
GetType()

Ruft den Type der aktuellen Instanz ab.Gets the Type of the current instance.

(Geerbt von Object)
MemberwiseClone()

Erstellt eine flache Kopie des aktuellen Object.Creates a shallow copy of the current Object.

(Geerbt von Object)
MoveNext()

Aktualisiert den Enumerator auf das nächste Element.Updates the enumerator to the next item.

Reset()

Setzt den Enumerator auf das erste Element zurück.Resets the enumerator to the first item.

ToString()

Gibt eine Zeichenfolge zurück, die das aktuelle Objekt darstellt.Returns a string that represents the current object.

(Geerbt von Object)

Explizite Schnittstellenimplementierungen

IEnumerator.Current

Ruft das aktuelle Element in der Auflistung ab.Gets the current item in the collection.

Gilt für:

Siehe auch