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Microsoft Visual Studio 2005/.NET Framework 2.0

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Biblioteca de clases de .NET Framework
Evidence (Clase)

Define el conjunto de información que constituye la entrada a las decisiones de las directivas de seguridad. No se puede heredar esta clase.

Espacio de nombres: System.Security.Policy
Ensamblado: mscorlib (en mscorlib.dll)

Visual Basic (Declaración)
<SerializableAttribute> _
<ComVisibleAttribute(True)> _
Public NotInheritable Class Evidence
    Implements ICollection, IEnumerable
Visual Basic (Uso)
Dim instance As Evidence
C#
[SerializableAttribute] 
[ComVisibleAttribute(true)] 
public sealed class Evidence : ICollection, IEnumerable
C++
[SerializableAttribute] 
[ComVisibleAttribute(true)] 
public ref class Evidence sealed : ICollection, IEnumerable
J#
/** @attribute SerializableAttribute() */ 
/** @attribute ComVisibleAttribute(true) */ 
public final class Evidence implements ICollection, IEnumerable
JScript
SerializableAttribute 
ComVisibleAttribute(true) 
public final class Evidence implements ICollection, IEnumerable

Los formularios comunes de evidencias incluyen firmas y la ubicación de origen del código, pero podrían contener cualquier otra cosa. Los objetos de cualquier tipo reconocidos por una directiva de seguridad representan una evidencia.

La directiva de seguridad está formada por grupos de código; un ensamblado determinado (la unidad de código básica para conceder permisos de seguridad) pertenece a un grupo de código si satisface la condición de pertenencia del grupo. Una evidencia es el conjunto de entradas para la directiva utilizado por las condiciones de pertenencia para determinar a qué grupos de código pertenece un ensamblado.

La clase Evidence es una colección (vea ICollection) que contiene un conjunto de objetos que representan la evidencia. Esta clase contiene dos conjuntos que se corresponden con el origen de la evidencia: la evidencia de host y la evidencia de ensamblado.

La directiva puede obtener evidencias de dos fuentes distintas para evaluar los permisos del código.

  • Host evidence la proporciona el host, y sólo los host a los que se haya concedido el permiso ControlEvidence pueden proporcionarla. Normalmente, se trata de una evidencia del origen del código y de las firmas digitales del ensamblado. La evidencia acerca del origen suele incluir las evidencias Url, Site y Zone. Las firmas hacen referencia a la compañía de software (firma AuthentiCode X.509v3) y a las identidades de nombres seguros. Ambos tipos de identidades basadas en firmas digitales se incorporan en el ensamblado, pero el host debe validarlas y pasarlas a la directiva; cuando se cargan, el sistema de seguridad comprueba la firma. A continuación, el sistema crea la evidencia adecuada y la pasa a la directiva si la firma correspondiente es válida.

  • Assembly evidence forma parte del propio ensamblado. Los programadores o los administradores pueden asociar una evidencia personalizada al ensamblado para ampliar el conjunto de evidencias para la directiva. La evidencia del ensamblado sólo se puede agregar durante la generación del ensamblado, que se produce antes de que éste se firme. La directiva predeterminada del sistema de seguridad no tiene en cuenta la evidencia proporcionada por el ensamblado, pero puede ampliarse la directiva para que la acepte.

En el siguiente ejemplo de código se muestra cómo crear nuevas clases Evidence con evidencia de host y evidencia de ensamblado.

Visual Basic
Imports System
Imports System.Collections
Imports System.Security
Imports System.Security.Policy
Imports System.Security.Permissions
Imports System.Globalization
Imports Microsoft.VisualBasic



Public Class Evidence_Example

    Public Function CreateEvidence() As Boolean
        Dim retVal As Boolean = True

        Try
            ' Create empty evidence using the default contructor.
            Dim ev1 As New Evidence
            Console.WriteLine("Created empty evidence with the default constructor.")

            ' Constructor used to create null host evidence.
            Dim ev2a As New Evidence(Nothing)
            Console.WriteLine("Created an Evidence object with null host evidence.")

            ' Constructor used to create host evidence.
            Dim url As New Url("http://www.treyresearch.com")
            Console.WriteLine(("Adding host evidence " & url.ToString()))
            ev2a.AddHost(url)
            Dim ev2b As New Evidence(ev2a)
            Console.WriteLine("Copy evidence into new evidence")
            Dim enum1 As IEnumerator = ev2b.GetHostEnumerator()
            enum1.MoveNext()
            Console.WriteLine(enum1.Current.ToString())
            ' Constructor used to create both host and assembly evidence.
            Dim oa1() As [Object]
            Dim site As New Site("www.wideworldimporters.com")
            Dim oa2 As [Object]() = {url, site}
            Dim ev3a As New Evidence(oa1, oa2)
            enum1 = ev3a.GetHostEnumerator()
            Dim enum2 As IEnumerator = ev3a.GetAssemblyEnumerator()
            enum2.MoveNext()
            Dim obj1 As [Object] = enum2.Current
            enum2.MoveNext()
            Console.WriteLine(("URL = " & obj1.ToString() & "  Site = " & enum2.Current.ToString()))
            ' Constructor used to create null host and null assembly evidence.
            Dim ev3b As New Evidence(Nothing, Nothing)
            Console.WriteLine("Create new evidence with null host and assembly evidence")

        Catch e As Exception
            Console.WriteLine("Fatal error: {0}", e.ToString())
            Return False
        End Try

        Return retVal
    End Function 'CreateEvidence

    Public Function DemonstrateEvidenceMembers() As Evidence
        Dim myEvidence As New Evidence
        Dim sPubKeyBlob As String = "00240000048000009400000006020000" & "00240000525341310004000001000100" & "19390E945A40FB5730204A25FA5DC4DA" & "B18688B412CB0EDB87A6EFC50E2796C9" & "B41AD3040A7E46E4A02516C598678636" & "44A0F74C39B7AB9C38C01F10AF4A5752" & "BFBCDF7E6DD826676AD031E7BCE63393" & "495BAD2CA4BE03B529A73C95E5B06BE7" & "35CA0F622C63E8F54171BD73E4C8F193" & "CB2664163719CA41F8159B8AC88F8CD3"
        Dim pubkey As [Byte]() = HexsToArray(sPubKeyBlob)

        ' Create a strong name.
        Dim mSN As New StrongName(New StrongNamePublicKeyBlob(pubkey), "SN01", New Version("0.0.0.0"))

        ' Create assembly and host evidence.
        Console.WriteLine("Adding assembly evidence.")
        myEvidence.AddAssembly("SN01")
        myEvidence.AddAssembly(New Version("0.0.0.0"))
        myEvidence.AddAssembly(mSN)
        Console.WriteLine(("Count of evidence items = " & myEvidence.Count.ToString()))
        Dim url As New Url("http://www.treyresearch.com")
        Console.WriteLine(("Adding host evidence " & url.ToString()))
        myEvidence.AddHost(url)
        PrintEvidence(myEvidence).ToString()
        Console.WriteLine(("Count of evidence items = " & myEvidence.Count.ToString()))
        Console.WriteLine(ControlChars.Lf & "Copy the evidence to an array using CopyTo, then display the array.")
        Dim evidenceArray(myEvidence.Count - 1) As Object
        myEvidence.CopyTo(evidenceArray, 0)
        Dim obj As Object
        For Each obj In evidenceArray
            Console.WriteLine(obj.ToString())
        Next obj
        Console.WriteLine(ControlChars.Lf & "Display the contents of the properties.")
        Console.WriteLine("Locked is the only property normally used by code.")
        Console.WriteLine("IsReadOnly, IsSynchronized, and SyncRoot properties are not normally used.")
        Console.WriteLine((ControlChars.Lf & "The default value for the Locked property = " & myEvidence.Locked.ToString()))
        Console.WriteLine(ControlChars.Lf & "Get the hashcode for the evidence.")
        Console.WriteLine(("HashCode = " & myEvidence.GetHashCode().ToString()))
        Console.WriteLine(ControlChars.Lf & "Get the type for the evidence.")
        Console.WriteLine(("Type = " & myEvidence.GetType().ToString()))
        Console.WriteLine(ControlChars.Lf & "Merge new evidence with the current evidence.")
        Dim oa1() As [Object]
        Dim site As New Site("www.wideworldimporters.com")
        Dim oa2 As [Object]() = {url, site}
        Dim newEvidence As New Evidence(oa1, oa2)
        myEvidence.Merge(newEvidence)

        Console.WriteLine(("Evidence count = " & PrintEvidence(myEvidence).ToString()))
        Console.WriteLine(ControlChars.Lf & "Remove URL evidence.")
        myEvidence.RemoveType(url.GetType())
        Console.WriteLine(("Evidence count is now: " & myEvidence.Count.ToString()))
        Console.WriteLine(ControlChars.Lf & "Make a copy of the current evidence.")
        Dim evidenceCopy As New Evidence(myEvidence)
        Console.WriteLine(("Count of new evidence items = " & evidenceCopy.Count.ToString()))
        Console.WriteLine(("Does the copy equal the current evidence? " & myEvidence.Equals(evidenceCopy)))
        Console.WriteLine(ControlChars.Lf & "Clear the current evidence.")
        myEvidence.Clear()
        Console.WriteLine(("Count is now " & myEvidence.Count.ToString()))
        Return myEvidence
    End Function 'DemonstrateEvidenceMembers

    Public Shared Function PrintEvidence(ByVal myEvidence As Evidence) As Integer
        Dim p As Integer = 0
        Console.WriteLine(ControlChars.Lf & "Current evidence = ")
        If myEvidence Is Nothing Then
            Return 0
        End If
        Dim list As IEnumerator = myEvidence.GetEnumerator()
        Dim obj As Object
        While list.MoveNext()
            Console.WriteLine(list.Current.ToString())
            p = p + 1
        End While
        Console.WriteLine(ControlChars.Lf)
        Return p
    End Function 'PrintEvidence

    ' Convert a hexidecimal string to an array.
    Public Shared Function HexsToArray(ByVal sHexString As String) As Byte()
        Dim array(sHexString.Length / 2) As [Byte]
        Dim i As Integer
        For i = 0 To sHexString.Length - 2 Step 2
            array((i / 2)) = [Byte].Parse(sHexString.Substring(i, 2), NumberStyles.HexNumber)
        Next i
        Return array
    End Function 'HexsToArray




    ' Main method.
    Public Shared Sub Main()
        Try
            Dim EvidenceTest As New Evidence_Example
            Dim ret As Boolean = EvidenceTest.CreateEvidence()
            If ret Then
                Console.WriteLine("Evidence successfully created.")
            Else
                Console.WriteLine("Evidence creation failed.")
            End If

            EvidenceTest.DemonstrateEvidenceMembers()
        Catch e As Exception
            Console.WriteLine(e.ToString())
            Environment.ExitCode = 101
        End Try
    End Sub 'Main
End Class 'Evidence_Example
C#
using System;
using System.Collections;
using System.Security;
using System.Security.Policy;
using System.Security.Permissions;
using System.Globalization;

public class Evidence_Example
{
    public bool CreateEvidence()
    {
        bool retVal = true;

        try
        {
            // Create empty evidence using the default contructor.
            Evidence ev1 = new Evidence();
            Console.WriteLine("Created empty evidence with the default constructor.");

            // Constructor used to create null host evidence.
            Evidence ev2a = new Evidence(null);
            Console.WriteLine("Created an Evidence object with null host evidence.");

            // Constructor used to create host evidence.
            Url url = new Url("http://www.treyresearch.com");
            Console.WriteLine("Adding host evidence " + url.ToString());
            ev2a.AddHost(url);
            Evidence ev2b = new Evidence(ev2a);
            Console.WriteLine("Copy evidence into new evidence");
            IEnumerator enum1 = ev2b.GetHostEnumerator();
            enum1.MoveNext();
            Console.WriteLine(enum1.Current.ToString());
            
            // Constructor used to create both host and assembly evidence.
            Object [] oa1 = {};
            Site site = new Site("www.wideworldimporters.com");
            Object [] oa2 = { url, site };
            Evidence ev3a = new Evidence(oa1, oa2);
            enum1 = ev3a.GetHostEnumerator();
            IEnumerator enum2 = ev3a.GetAssemblyEnumerator();
            enum2.MoveNext();
            Object obj1 = enum2.Current;
            enum2.MoveNext();
            Console.WriteLine("URL = " + obj1.ToString() + "  Site = " + enum2.Current.ToString());
            
            // Constructor used to create null host and null assembly evidence.
            Evidence ev3b = new Evidence(null, null);
            Console.WriteLine("Create new evidence with null host and assembly evidence");
            
        }
        catch (Exception e)
        {
            Console.WriteLine("Fatal error: {0}", e.ToString());
            return false;
        }

        return retVal;
    }
    public Evidence DemonstrateEvidenceMembers()
    {
        Evidence myEvidence = new Evidence();
        string sPubKeyBlob =    "00240000048000009400000006020000" + 
            "00240000525341310004000001000100" + 
            "19390E945A40FB5730204A25FA5DC4DA" + 
            "B18688B412CB0EDB87A6EFC50E2796C9" + 
            "B41AD3040A7E46E4A02516C598678636" + 
            "44A0F74C39B7AB9C38C01F10AF4A5752" + 
            "BFBCDF7E6DD826676AD031E7BCE63393" + 
            "495BAD2CA4BE03B529A73C95E5B06BE7" + 
            "35CA0F622C63E8F54171BD73E4C8F193" + 
            "CB2664163719CA41F8159B8AC88F8CD3";
        Byte[] pubkey = HexsToArray(sPubKeyBlob);

        // Create a strong name.
        StrongName mSN = new StrongName(new StrongNamePublicKeyBlob(pubkey), "SN01", new Version("0.0.0.0"));

        // Create assembly and host evidence.
        Console.WriteLine("Adding assembly evidence.");
        myEvidence.AddAssembly("SN01");
        myEvidence.AddAssembly(new Version("0.0.0.0"));
        myEvidence.AddAssembly(mSN);
        Console.WriteLine("Count of evidence items = " + myEvidence.Count.ToString());
        Url url = new Url("http://www.treyresearch.com");
        Console.WriteLine("Adding host evidence " + url.ToString());
        myEvidence.AddHost(url);
        PrintEvidence(myEvidence).ToString();
        Console.WriteLine("Count of evidence items = " + myEvidence.Count.ToString());
        Console.WriteLine("\nCopy the evidence to an array using CopyTo, then display the array.");
        object[] evidenceArray = new object[myEvidence.Count];
        myEvidence.CopyTo(evidenceArray, 0);
        foreach (object obj in evidenceArray)
        {
            Console.WriteLine(obj.ToString());
        }
        Console.WriteLine("\nDisplay the contents of the properties.");
        Console.WriteLine("Locked is the only property normally used by code.");
        Console.WriteLine("IsReadOnly, IsSynchronized, and SyncRoot properties are not normally used.");
        Console.WriteLine("\nThe default value for the Locked property = " + myEvidence.Locked.ToString());
        
        Console.WriteLine("\nGet the hashcode for the evidence.");
        Console.WriteLine("HashCode = " + myEvidence.GetHashCode().ToString());
        Console.WriteLine("\nGet the type for the evidence.");
        Console.WriteLine("Type = " + myEvidence.GetType().ToString());
        Console.WriteLine("\nMerge new evidence with the current evidence.");
        Object [] oa1 = {};
        Site site = new Site("www.wideworldimporters.com");
        Object [] oa2 = { url, site };
        Evidence newEvidence = new Evidence(oa1, oa2);
        myEvidence.Merge(newEvidence);
        Console.WriteLine("Evidence count = " + PrintEvidence(myEvidence).ToString());
        Console.WriteLine("\nRemove URL evidence.");
        myEvidence.RemoveType(url.GetType());
        Console.WriteLine("Evidence count is now: " + myEvidence.Count.ToString());
        Console.WriteLine("\nMake a copy of the current evidence.");
        Evidence evidenceCopy = new Evidence(myEvidence);
        Console.WriteLine("Count of new evidence items = " + evidenceCopy.Count);
        Console.WriteLine("Does the copy equal the current evidence? " + myEvidence.Equals(evidenceCopy));
        Console.WriteLine("\nClear the current evidence.");
        myEvidence.Clear();
        Console.WriteLine("Count is now " + myEvidence.Count.ToString());
        return myEvidence;
    }
    public static int PrintEvidence(Evidence myEvidence)
    {
        int p = 0;
        Console.WriteLine("\nCurrent evidence = ");
        if (null == myEvidence) return 0;
        IEnumerator list = myEvidence.GetEnumerator();
        while (list.MoveNext())
        {
            Console.WriteLine(list.Current.ToString());
        }

        Console.WriteLine("\n");
        return p;
    }
    // Convert a hexidecimal string to an array.
    public static byte[] HexsToArray(string sHexString)
    {
        Byte[] array = new Byte[sHexString.Length/2];
        for (int i = 0; i < sHexString.Length; i += 2)
        {
            array[i / 2] = Byte.Parse(sHexString.Substring(i, 2), NumberStyles.HexNumber);
        }
        return array;
    }



    // Main method.
    public static void Main()
    {
        try
        {
            Evidence_Example EvidenceTest = new Evidence_Example();
            bool ret = EvidenceTest.CreateEvidence();
            if (ret)
            {
                Console.WriteLine("Evidence successfully created.");
            }
            else
            {
                Console.WriteLine("Evidence creation failed.");
            }
            
            EvidenceTest.DemonstrateEvidenceMembers();
        }
        catch(Exception e)
        {
    
            Console.WriteLine(e.ToString());
            Environment.ExitCode = 101;
        }
    }
}
C++
using namespace System;
using namespace System::Collections;
using namespace System::Security;
using namespace System::Security::Policy;
using namespace System::Security::Permissions;
using namespace System::Globalization;
public ref class Evidence_Example
{
public:
   bool CreateEvidence()
   {
      bool retVal = true;
      try
      {
         // Create empty evidence using the default contructor.
         Evidence^ ev1 = gcnew Evidence;
         Console::WriteLine( "Created empty evidence with the default constructor." );

         // Constructor used to create null host evidence.
         Evidence^ ev2a = gcnew Evidence( nullptr );
         Console::WriteLine( "Created an Evidence object with null host evidence." );

         // Constructor used to create host evidence.
         Url^ url = gcnew Url( "http://www.treyresearch.com" );
         Console::WriteLine( "Adding host evidence {0}", url );
         ev2a->AddHost( url );
         Evidence^ ev2b = gcnew Evidence( ev2a );
         Console::WriteLine( "Copy evidence into new evidence" );
         IEnumerator^ enum1 = ev2b->GetHostEnumerator();
         enum1->MoveNext();
         Console::WriteLine( enum1->Current );

         // Constructor used to create both host and assembly evidence.
         array<Object^>^oa1 = {};
         Site^ site = gcnew Site( "www.wideworldimporters.com" );
         array<Object^>^oa2 = {url,site};
         Evidence^ ev3a = gcnew Evidence( oa1,oa2 );
         enum1 = ev3a->GetHostEnumerator();
         IEnumerator^ enum2 = ev3a->GetAssemblyEnumerator();
         enum2->MoveNext();
         Object^ obj1 = enum2->Current;
         enum2->MoveNext();
         Console::WriteLine( "URL = {0}  Site = {1}", obj1, enum2->Current );
         
         // Constructor used to create null host and null assembly evidence.
         Evidence^ ev3b = gcnew Evidence( nullptr,nullptr );
         Console::WriteLine( "Create new evidence with null host and assembly evidence" );
      }
      catch ( Exception^ e ) 
      {
         Console::WriteLine( "Fatal error: {0}", e );
         return false;
      }

      return retVal;
   }

   Evidence^ DemonstrateEvidenceMembers()
   {
      Evidence^ myEvidence = gcnew Evidence;
      String^ sPubKeyBlob = "00240000048000009400000006020000"
      "00240000525341310004000001000100"
      "19390E945A40FB5730204A25FA5DC4DA"
      "B18688B412CB0EDB87A6EFC50E2796C9"
      "B41AD3040A7E46E4A02516C598678636"
      "44A0F74C39B7AB9C38C01F10AF4A5752"
      "BFBCDF7E6DD826676AD031E7BCE63393"
      "495BAD2CA4BE03B529A73C95E5B06BE7"
      "35CA0F622C63E8F54171BD73E4C8F193"
      "CB2664163719CA41F8159B8AC88F8CD3";
      array<Byte>^pubkey = HexsToArray( sPubKeyBlob );

      // Create a strong name.
      StrongName^ mSN = gcnew StrongName( gcnew StrongNamePublicKeyBlob( pubkey ),"SN01",gcnew Version( "0.0.0.0" ) );

      // Create assembly and host evidence.
      Console::WriteLine( "Adding assembly evidence." );
      myEvidence->AddAssembly( "SN01" );
      myEvidence->AddAssembly( gcnew Version( "0.0.0.0" ) );
      myEvidence->AddAssembly( mSN );
      Console::WriteLine( "Count of evidence items = {0}", myEvidence->Count );

      Url^ url = gcnew Url( "http://www.treyresearch.com" );
      Console::WriteLine( "Adding host evidence {0}", url );
      myEvidence->AddHost( url );
      PrintEvidence( myEvidence ).ToString();
      Console::WriteLine( "Count of evidence items = {0}", myEvidence->Count );

      Console::WriteLine( "\nCopy the evidence to an array using CopyTo, then display the array." );
      array<Object^>^evidenceArray = gcnew array<Object^>(myEvidence->Count);
      myEvidence->CopyTo( evidenceArray, 0 );
      for each (Object^ obj in evidenceArray)
      {
         Console::WriteLine(obj->ToString());
      }

      Console::WriteLine( "\nDisplay the contents of the properties." );
      Console::WriteLine( "Locked is the only property normally used by code." );
      Console::WriteLine( "IsReadOnly, IsSynchronized, and SyncRoot properties are not normally used." );
      
      Console::WriteLine( "\nThe default value for the Locked property = {0}", myEvidence->Locked );

      Console::WriteLine( "\nGet the hashcode for the evidence." );
      Console::WriteLine( "HashCode = {0}", myEvidence->GetHashCode() );

      Console::WriteLine( "\nGet the type for the evidence." );
      Console::WriteLine( "Type = {0}", myEvidence->GetType() );

      Console::WriteLine( "\nMerge new evidence with the current evidence." );
      array<Object^>^oa1 = {};
      Site^ site = gcnew Site( "www.wideworldimporters.com" );
      array<Object^>^oa2 = {url,site};
      Evidence^ newEvidence = gcnew Evidence( oa1,oa2 );
      myEvidence->Merge( newEvidence );
      Console::WriteLine( "Evidence count = {0}", PrintEvidence( myEvidence ) );

      Console::WriteLine( "\nRemove URL evidence." );
      myEvidence->RemoveType( url->GetType() );
      Console::WriteLine( "Evidence count is now: {0}", myEvidence->Count );

      Console::WriteLine( "\nMake a copy of the current evidence." );
      Evidence^ evidenceCopy = gcnew Evidence( myEvidence );
      Console::WriteLine( "Count of new evidence items = {0}", evidenceCopy->Count );
      Console::WriteLine( "Does the copy equal the current evidence? {0}", myEvidence->Equals( evidenceCopy ) );

      Console::WriteLine( "\nClear the current evidence." );
      myEvidence->Clear();
      Console::WriteLine( "Count is now {0}", myEvidence->Count );

      return myEvidence;
   }

   static int PrintEvidence( Evidence^ myEvidence )
   {
      int p = 0;
      Console::WriteLine( "\nCurrent evidence = " );
      if ( nullptr == myEvidence )
            return 0;

      IEnumerator^ list = myEvidence->GetEnumerator();
      IEnumerator^ myEnum1 = list;
      while ( myEnum1->MoveNext() )
      {
         Object^ obj = safe_cast<Object^>(myEnum1->Current);
         Console::WriteLine( obj );
         p++;
      }

      Console::WriteLine( "\n" );
      return p;
   }

   // Convert a hexadecimal string to an array.
   static array<Byte>^ HexsToArray( String^ sHexString )
   {
      array<Byte>^arr = gcnew array<Byte>(sHexString->Length / 2);
      for ( int i = 0; i < sHexString->Length; i += 2 )
      {
         arr[ i / 2 ] = Byte::Parse( sHexString->Substring( i, 2 ), NumberStyles::HexNumber );

      }
      return arr;
   }
};


// Main method.
int main()
{
   try
   {
      Evidence_Example^ EvidenceTest = gcnew Evidence_Example;
      bool ret = EvidenceTest->CreateEvidence();
      if ( ret )
      {
         Console::WriteLine( "Evidence successfully created." );
      }
      else
      {
         Console::WriteLine( "Evidence creation failed." );
      }
      EvidenceTest->DemonstrateEvidenceMembers();
   }
   catch ( Exception^ e ) 
   {
      Console::WriteLine( e );
      Environment::ExitCode = 101;
   }
}
J#
import System.*;
import System.Collections.*;
import System.Security.*;
import System.Security.Policy.*;
import System.Security.Permissions.*;
import System.Globalization.*;
import System.Byte;

public class EvidenceExample
{
    public boolean CreateEvidence()
    {
        boolean retVal = true;

        try {
            // Create empty evidence using the default contructor.
            Evidence ev1 = new Evidence();
            Console.WriteLine("Created empty evidence with the " 
                + " default constructor.");

            // Constructor used to create null host evidence.
            Evidence ev2a = new Evidence(null);
            Console.WriteLine("Created an Evidence object with " 
                + " null host evidence.");

            // Constructor used to create host evidence.
            Url url = new Url("http://www.treyresearch.com");
            Console.WriteLine(("Adding host evidence " + url.ToString()));
            ev2a.AddHost(url);
            Evidence ev2b = new Evidence(ev2a);
            Console.WriteLine("Copy evidence into new evidence");

            IEnumerator enum1 = ev2b.GetHostEnumerator();
            enum1.MoveNext();
            Console.WriteLine(enum1.get_Current().ToString());

            // Constructor used to create both host and assembly evidence.
            Object oa1[] = null;
            Site site = new Site("www.wideworldimporters.com");
            Object oa2[] =  { url, site };
            Evidence ev3a = new Evidence(oa1, oa2);
            enum1 = ev3a.GetHostEnumerator();
            IEnumerator enum2 = ev3a.GetAssemblyEnumerator();
            enum2.MoveNext();
            Object obj1 = enum2.get_Current();
            enum2.MoveNext();
            Console.WriteLine(("URL = " + obj1.ToString() + "  Site = " 
                + enum2.get_Current().ToString()));

            // Constructor used to create null host and null assembly evidence.
            Evidence ev3b = new Evidence(null, null);
            Console.WriteLine("Create new evidence with null host and " 
                + " assembly evidence");
        }
        catch (System.Exception e) {
            Console.WriteLine("Fatal error: {0}", e.ToString());
            return false;
        }
        return retVal;
    } //CreateEvidence

    public Evidence DemonstrateEvidenceMembers()
    {
        Evidence myEvidence = new Evidence();
        String sPubKeyBlob = "00240000525341310004000001000100" 
            + "19390E945A40FB5730204A25FA5DC4DA" 
            + "B18688B412CB0EDB87A6EFC50E2796C9" 
            + "B41AD3040A7E46E4A02516C598678636" 
            + "44A0F74C39B7AB9C38C01F10AF4A5752" 
            + "BFBCDF7E6DD826676AD031E7BCE63393" 
            + "495BAD2CA4BE03B529A73C95E5B06BE7" 
            + "35CA0F622C63E8F54171BD73E4C8F193" 
            + "CB2664163719CA41F8159B8AC88F8CD3";
        Byte pubkey[] = HexsToArray(sPubKeyBlob);

        // Create a strong name.
        StrongName mSN = new StrongName(
            new StrongNamePublicKeyBlob((ubyte[])pubkey), "SN01", 
                new Version("0.0.0.0"));

        // Create assembly and host evidence.
        Console.WriteLine("Adding assembly evidence.");
        myEvidence.AddAssembly("SN01");
        myEvidence.AddAssembly(new Version("0.0.0.0"));
        myEvidence.AddAssembly(mSN);
        Console.WriteLine(("Count of evidence items = " 
            + myEvidence.get_Count()));

        Url url = new Url("http://www.treyresearch.com");
        Console.WriteLine(("Adding host evidence " + url.ToString()));
        myEvidence.AddHost(url);
        String.valueOf(PrintEvidence(myEvidence));
        Console.WriteLine(("Count of evidence items = " 
            + myEvidence.get_Count()));

        Console.WriteLine("\nCopy the evidence to an array using CopyTo," 
            + " then display the array.");
        Object evidenceArray[] = new Object[myEvidence.get_Count()];
        myEvidence.CopyTo(evidenceArray, 0);
        for (int objCount = 0; objCount < evidenceArray.length; objCount++) {
            Object obj = evidenceArray[objCount];
            Console.WriteLine(obj.ToString());
        }

        Console.WriteLine("\nDisplay the contents of the properties.");
        Console.WriteLine("Locked is the only property normally used by code.");
        Console.WriteLine("IsReadOnly, IsSynchronized, and SyncRoot " 
            + " properties are not normally used.");

        Console.WriteLine(("\nThe default value for the Locked property = " 
            + System.Convert.ToString(myEvidence.get_Locked())));

        Console.WriteLine("\nGet the hashcode for the evidence.");
        Console.WriteLine(("HashCode = " + myEvidence.GetHashCode()));

        Console.WriteLine("\nGet the type for the evidence.");
        Console.WriteLine(("Type = " + myEvidence.GetType().ToString()));

        Console.WriteLine("\nMerge new evidence with the current evidence.");
        Object oa1[] = null;
        Site site = new Site("www.wideworldimporters.com");
        Object oa2[] =  { url, site };
        Evidence newEvidence = new Evidence(oa1, oa2);
        myEvidence.Merge(newEvidence);
        Console.WriteLine(("Evidence count = " + PrintEvidence(myEvidence)));

        Console.WriteLine("\nRemove URL evidence.");
        myEvidence.RemoveType(url.GetType());
        Console.WriteLine(("Evidence count is now: " + myEvidence.get_Count()));

        Console.WriteLine("\nMake a copy of the current evidence.");
        Evidence evidenceCopy = new Evidence(myEvidence);
        Console.WriteLine(("Count of new evidence items = " 
            + evidenceCopy.get_Count()));
        Console.WriteLine(("Does the copy equal the current evidence? " 
            + System.Convert.ToString(myEvidence.Equals(evidenceCopy))));

        Console.WriteLine("\nClear the current evidence.");
        myEvidence.Clear();
        Console.WriteLine(("Count is now " + myEvidence.get_Count()));
        return myEvidence;
    } //DemonstrateEvidenceMembers

    public static int PrintEvidence(Evidence myEvidence)
    {
        int p = 0;
        Console.WriteLine("\nCurrent evidence = ");
        if (null == myEvidence) {
            return 0;
        }
        IEnumerator list = myEvidence.GetEnumerator();

        while (list.MoveNext()) {
            Console.WriteLine(String.valueOf(list.get_Current()));
        }
        Console.WriteLine("\n");
        return p;
    } //PrintEvidence

    public static System.Byte[] HexsToArray(String sHexString)
    {
        Byte array[] = new Byte[sHexString.get_Length() / 2];
        for (int i = 0; i < sHexString.get_Length(); i += 2) {
            array[i / 2] = (Byte)Byte.Parse(sHexString.Substring(i, 2), 
                NumberStyles.HexNumber);
        }
        return array;
    } //HexsToArray

    public static void main(String[] args)
    {
        try {
            EvidenceExample EvidenceTest = new EvidenceExample();
            boolean ret = EvidenceTest.CreateEvidence();
            if (ret) {
                Console.WriteLine("Evidence successfully created.");
            }
            else {
                Console.WriteLine("Evidence creation failed.");
            }
            EvidenceTest.DemonstrateEvidenceMembers();
        }
        catch (System.Exception e) {
            Console.WriteLine(e.ToString());
            Environment.set_ExitCode(101);
        }
    } //main
} //EvidenceExample
System.Object
  System.Security.Policy.Evidence
Los miembros estáticos públicos (Shared en Visual Basic) de este tipo son seguros para la ejecución de subprocesos. No se garantiza que los miembros de instancias sean seguros para la ejecución de subprocesos.

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium, Windows Mobile para Pocket PC, Windows Mobile para Smartphone, Windows Server 2003, Windows XP Media Center, Windows XP Professional x64, Windows XP SP2, Windows XP Starter Edition

.NET Framework no admite todas las versiones de cada plataforma. Para obtener una lista de las versiones admitidas, vea Requisitos del sistema.

.NET Framework

Compatible con: 2.0, 1.1, 1.0

.NET Compact Framework

Compatible con: 2.0, 1.0
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