SecureString Constructores

Definición

Espacio de nombres:

System.Security

Ensamblado:

System.Runtime.InteropServices.dll

Inicializa una nueva instancia de la clase SecureString.

Sobrecargas

SecureString()	Inicializa una nueva instancia de la clase SecureString.
SecureString(Char*, Int32)	Inicializa una nueva instancia de la clase SecureString desde una submatriz de objetos Char. Este constructor no es conforme a CLS. La alternativa conforme a CLS es SecureString().

SecureString()

Source:

SecureString.cs

Inicializa una nueva instancia de la clase SecureString.

public:
 SecureString();

public SecureString ();

Public Sub New ()

Excepciones

CryptographicException

Error al proteger o desproteger el valor de esta instancia.

NotSupportedException

Operación no permitida en esta plataforma.

Ejemplos

En el ejemplo siguiente se usa el constructor predeterminado (o sin parámetros) para crear una instancia de un nuevo SecureString objeto. A continuación, llama al AppendChar método para agregarle una matriz de caracteres.

using namespace System;
using namespace System::Security;

int main(array<System::String ^> ^args)
{
   // Define the string value to assign to a new secure string.
   Char chars[4] = { 't', 'e', 's', 't' };
   // Instantiate the secure string.
   SecureString^ testString = gcnew SecureString();
   // Assign the character array to the secure string.
   for each (Char ch in chars)
   {
      testString->AppendChar(ch);
   }   
   // Display secure string length.
   Console::WriteLine("The length of the string is {0} characters.", 
                        testString->Length);

   delete testString;
   return 0;
}
// The example displays the following output:
//      The length of the string is 4 characters.

using System;
using System.Security;

public class Example
{
   public static void Main()
   {
      // Define the string value to assign to a new secure string.
      char[] chars = { 't', 'e', 's', 't' };
      // Instantiate the secure string.
      SecureString testString = new SecureString();
      // Assign the character array to the secure string.
      foreach (char ch in chars)
         testString.AppendChar(ch);      
      // Display secure string length.
      Console.WriteLine("The length of the string is {0} characters.", 
                        testString.Length);
      testString.Dispose();
   }
}
// The example displays the following output:
//      The length of the string is 4 characters.

Imports System.Security

Module Example
   Public Sub Main()
      ' Define the string value to assign to a new secure string.
      Dim chars() As Char = { "t"c, "e"c, "s"c, "t"c }
      ' Instantiate the secure string.
      Dim testString As SecureString = New SecureString()
      ' Assign the character array to the secure string.
      For Each ch As char In chars
         testString.AppendChar(ch)
      Next         
      ' Display secure string length.
      Console.WriteLine("The length of the string is {0} characters.", _ 
                        testString.Length)
      testString.Dispose()
   End Sub
End Module
' The example displays the following output:
'      The length of the string is 4 characters.

En el ejemplo siguiente se crea un SecureString objeto a partir del valor de un String objeto .

using namespace System;
using namespace System::Security;

int main(array<System::String ^> ^args)
{
   // Define the string value to be assigned to the secure string.
   String^ initString = "TestString";
   // Instantiate the secure string.
   SecureString^ testString = gcnew SecureString();
   // Assign the character array to the secure string.
   for each (Char ch in initString)
   {
      testString->AppendChar(ch);
   }   
   // Display secure string length.
   Console::WriteLine("The length of the string is {0} characters.", 
                        testString->Length);

   delete testString;
   return 0;
}
// The example displays the following output:
//      The length of the string is 10 characters.

using System;
using System.Security;

public class Example
{
   public static void Main()
   {
      // Define the string value to be assigned to the secure string.
      string initString = "TestString";
      // Instantiate the secure string.
      SecureString testString = new SecureString();
      // Use the AppendChar method to add each char value to the secure string.
      foreach (char ch in initString)
         testString.AppendChar(ch);
         
      // Display secure string length.
      Console.WriteLine("The length of the string is {0} characters.", 
                        testString.Length);
      testString.Dispose();
   }
}
// The example displays the following output:
//      The length of the string is 10 characters.

Imports System.Security

Module Example
   Public Sub Main()
      ' Define the string value to be assigned to the secure string.
      Dim initString As String = "TestString"
      ' Instantiate the secure string.
      Dim testString As SecureString = New SecureString()
      ' Use the AppendChar method to add each char value to the secure string.
      For Each ch As Char In initString
         testString.AppendChar(ch)
      Next   
      ' Display secure string length.
      Console.WriteLine("The length of the string is {0} characters.", _ 
                        testString.Length)
      testString.Dispose()
   End Sub
End Module
' The example displays the following output:
'      The length of the string is 10 characters.

SecureString(Char*, Int32)

Source:

SecureString.cs

Importante

Esta API no es conforme a CLS.

Inicializa una nueva instancia de la clase SecureString desde una submatriz de objetos Char.

Este constructor no es conforme a CLS. La alternativa conforme a CLS es SecureString().

public:
 SecureString(char* value, int length);

[System.CLSCompliant(false)]
public SecureString (char* value, int length);

[<System.CLSCompliant(false)>]
new System.Security.SecureString : nativeptr<char> * int -> System.Security.SecureString

Parámetros

value

Char*

Puntero a una matriz de objetos Char.

length

Int32

Número de elementos de value que se van a incluir en la nueva instancia.

Atributos

CLSCompliantAttribute

Excepciones

ArgumentNullException

value es null.

ArgumentOutOfRangeException

length es menor que cero o mayor que 65 536.

CryptographicException

Error al proteger o desproteger el valor de esta cadena segura.

NotSupportedException

Operación no permitida en esta plataforma.

Ejemplos

En el ejemplo siguiente se crea una instancia de un nuevo SecureString objeto pasando su constructor un puntero a una matriz de caracteres.

using namespace System;
using namespace System::Security;

int main(array<System::String ^> ^args)
{
   SecureString^ testString;
   // Define the string value to assign to a new secure string.
   Char chars[4] = { 't', 'e', 's', 't' };
   // Instantiate a new secure string.
   Char* pChars = &chars[0];

   testString = gcnew SecureString(pChars, sizeof(chars)/sizeof(chars[0]));

   // Display secure string length.
   Console::WriteLine("The length of the string is {0} characters.", 
                        testString->Length);
   delete testString;
   return 0;
}
// The example displays the following output:
//      The length of the string is 4 characters.

using System;
using System.Security;

public class Example
{
   unsafe public static void Main()
   {
      SecureString testString;
      // Define the string value to assign to a new secure string.
      char[] chars = { 't', 'e', 's', 't' };

      // Instantiate a new secure string.
      fixed(char* pChars = chars)
      {
         testString = new SecureString(pChars, chars.Length);
      }
      // Display secure string length.
      Console.WriteLine("The length of the string is {0} characters.", 
                        testString.Length);
      testString.Dispose();
   }
}
// The example displays the following output:
//      The length of the string is 4 characters.

Comentarios

Este constructor inicializa el nuevo SecureString objeto en el número de caracteres value especificados por length; el valor de la instancia se cifra.

En C#, este constructor solo se define en el contexto del código no seguro.