SerializationInfo.GetInt32(String) Yöntem
Tanım
Önemli
Bazı bilgiler ürünün ön sürümüyle ilgilidir ve sürüm öncesinde önemli değişiklikler yapılmış olabilir. Burada verilen bilgilerle ilgili olarak Microsoft açık veya zımni hiçbir garanti vermez.
Depodan SerializationInfo 32 bit imzalı bir tamsayı değeri alır.
public:
int GetInt32(System::String ^ name);
public int GetInt32 (string name);
member this.GetInt32 : string -> int
Public Function GetInt32 (name As String) As Integer
Parametreler
- name
- String
Alınacak değerin adı.
Döndürülenler
ile name
ilişkilendirilmiş 32 bit imzalı tamsayı.
Özel durumlar
name
, null
değeridir.
ile name
ilişkilendirilmiş değer 32 bit imzalı tamsayıya dönüştürülemez.
Belirtilen ada sahip bir öğe geçerli örnekte bulunamadı.
Örnekler
using namespace System;
using namespace System::IO;
using namespace System::Collections;
using namespace System::Runtime::Serialization::Formatters::Binary;
using namespace System::Runtime::Serialization;
ref class SingletonSerializationHelper;
// There should be only one instance of this type per AppDomain.
[Serializable]
public ref class Singleton sealed: public ISerializable
{
private:
// This is the one instance of this type.
static Singleton^ theOneObject = gcnew Singleton;
public:
// Here are the instance fields.
String^ someString;
Int32 someNumber;
private:
// Private constructor allowing this type to construct the singleton.
Singleton()
{
// Do whatever is necessary to initialize the singleton.
someString = "This is a String* field";
someNumber = 123;
}
public:
// A method returning a reference to the singleton.
static Singleton^ GetSingleton()
{
return theOneObject;
}
// A method called when serializing a Singleton.
[System::Security::Permissions::SecurityPermissionAttribute
(System::Security::Permissions::SecurityAction::LinkDemand,
Flags=System::Security::Permissions::SecurityPermissionFlag::SerializationFormatter)]
virtual void GetObjectData( SerializationInfo^ info, StreamingContext context )
{
// Instead of serializing this Object*, we will
// serialize a SingletonSerializationHelp instead.
info->SetType( SingletonSerializationHelper::typeid );
// No other values need to be added.
}
// NOTE: ISerializable*'s special constructor is NOT necessary
// because it's never called
};
[Serializable]
private ref class SingletonSerializationHelper sealed: public IObjectReference
{
public:
// This Object* has no fields (although it could).
// GetRealObject is called after this Object* is deserialized
virtual Object^ GetRealObject( StreamingContext context )
{
// When deserialiing this Object*, return a reference to
// the singleton Object* instead.
return Singleton::GetSingleton();
}
};
[STAThread]
int main()
{
FileStream^ fs = gcnew FileStream( "DataFile.dat",FileMode::Create );
try
{
// Construct a BinaryFormatter and use it
// to serialize the data to the stream.
BinaryFormatter^ formatter = gcnew BinaryFormatter;
// Create an array with multiple elements refering to
// the one Singleton Object*.
array<Singleton^>^a1 = {Singleton::GetSingleton(),Singleton::GetSingleton()};
// This displays S"True".
Console::WriteLine( "Do both array elements refer to the same Object? {0}", (a1[ 0 ] == a1[ 1 ]) );
// Serialize the array elements.
formatter->Serialize( fs, a1 );
// Deserialize the array elements.
fs->Position = 0;
array<Singleton^>^a2 = (array<Singleton^>^)formatter->Deserialize( fs );
// This displays S"True".
Console::WriteLine( "Do both array elements refer to the same Object? {0}", (a2[ 0 ] == a2[ 1 ]) );
// This displays S"True".
Console::WriteLine( "Do all array elements refer to the same Object? {0}", (a1[ 0 ] == a2[ 0 ]) );
}
catch ( SerializationException^ e )
{
Console::WriteLine( "Failed to serialize. Reason: {0}", e->Message );
throw;
}
finally
{
fs->Close();
}
return 0;
}
using System;
using System.Text;
using System.IO;
// Add references to Soap and Binary formatters.
using System.Runtime.Serialization.Formatters.Binary;
using System.Runtime.Serialization.Formatters.Soap ;
using System.Runtime.Serialization;
[Serializable]
public class MyItemType : ISerializable
{
public MyItemType()
{
// Empty constructor required to compile.
}
// The value to serialize.
private string myProperty_value;
public string MyProperty
{
get { return myProperty_value; }
set { myProperty_value = value; }
}
// Implement this method to serialize data. The method is called
// on serialization.
public void GetObjectData(SerializationInfo info, StreamingContext context)
{
// Use the AddValue method to specify serialized values.
info.AddValue("props", myProperty_value, typeof(string));
}
// The special constructor is used to deserialize values.
public MyItemType(SerializationInfo info, StreamingContext context)
{
// Reset the property value using the GetValue method.
myProperty_value = (string) info.GetValue("props", typeof(string));
}
}
// This is a console application.
public static class Test
{
static void Main()
{
// This is the name of the file holding the data. You can use any file extension you like.
string fileName = "dataStuff.myData";
// Use a BinaryFormatter or SoapFormatter.
IFormatter formatter = new BinaryFormatter();
//IFormatter formatter = new SoapFormatter();
Test.SerializeItem(fileName, formatter); // Serialize an instance of the class.
Test.DeserializeItem(fileName, formatter); // Deserialize the instance.
Console.WriteLine("Done");
Console.ReadLine();
}
public static void SerializeItem(string fileName, IFormatter formatter)
{
// Create an instance of the type and serialize it.
MyItemType t = new MyItemType();
t.MyProperty = "Hello World";
FileStream s = new FileStream(fileName , FileMode.Create);
formatter.Serialize(s, t);
s.Close();
}
public static void DeserializeItem(string fileName, IFormatter formatter)
{
FileStream s = new FileStream(fileName, FileMode.Open);
MyItemType t = (MyItemType)formatter.Deserialize(s);
Console.WriteLine(t.MyProperty);
}
}
Imports System.Text
Imports System.IO
' Add references to Soap and Binary formatters.
Imports System.Runtime.Serialization.Formatters.Binary
Imports System.Runtime.Serialization.Formatters.Soap
Imports System.Runtime.Serialization
<Serializable()> _
Public Class MyItemType
Implements ISerializable
' Empty constructor required to compile.
Public Sub New()
End Sub
' The value to serialize.
Private myProperty_value As String
Public Property MyProperty() As String
Get
Return myProperty_value
End Get
Set(value As String)
myProperty_value = value
End Set
End Property
' Implement this method to serialize data. The method is called
' on serialization.
Public Sub GetObjectData(info As SerializationInfo, context As StreamingContext) Implements ISerializable.GetObjectData
' Use the AddValue method to specify serialized values.
info.AddValue("props", myProperty_value, GetType(String))
End Sub
' The special constructor is used to deserialize values.
Public Sub New(info As SerializationInfo, context As StreamingContext)
' Reset the property value using the GetValue method.
myProperty_value = DirectCast(info.GetValue("props", GetType(String)), String)
End Sub
End Class
' This is a console application.
Public Class Test
Public Shared Sub Main()
' This is the name of the file holding the data. You can use any file extension you like.
Dim fileName As String = "dataStuff.myData"
' Use a BinaryFormatter or SoapFormatter.
Dim formatter As IFormatter = New BinaryFormatter()
' Dim formatter As IFormatter = New SoapFormatter()
Test.SerializeItem(fileName, formatter)
' Serialize an instance of the class.
Test.DeserializeItem(fileName, formatter)
' Deserialize the instance.
Console.WriteLine("Done")
Console.ReadLine()
End Sub
Public Shared Sub SerializeItem(fileName As String, formatter As IFormatter)
' Create an instance of the type and serialize it.
Dim myType As New MyItemType()
myType.MyProperty = "Hello World"
Dim fs As New FileStream(fileName, FileMode.Create)
formatter.Serialize(fs, myType)
fs.Close()
End Sub
Public Shared Sub DeserializeItem(fileName As String, formatter As IFormatter)
Dim fs As New FileStream(fileName, FileMode.Open)
Dim myType As MyItemType = DirectCast(formatter.Deserialize(fs), MyItemType)
Console.WriteLine(myType.MyProperty)
End Sub
End Class
Açıklamalar
Değer 32 bit işaretli bir tamsayıysa veya bir tamsayıya dönüştürülebiliyorsa, bu değer döndürülür; aksi takdirde, bir InvalidCastException oluşturulur. Tüm dönüştürmeler, ile SerializationInfoilişkili tarafından IFormatterConverter gerçekleştirilir.