Evidence 类
定义组成对安全策略决策的输入的一组信息。无法继承此类。
**命名空间:**System.Security.Policy
**程序集:**mscorlib（在 mscorlib.dll 中）
语法
声明
<SerializableAttribute> _
<ComVisibleAttribute(True)> _
Public NotInheritable Class Evidence
Implements ICollection, IEnumerable
用法
Dim instance As Evidence
[SerializableAttribute]
[ComVisibleAttribute(true)]
public sealed class Evidence : ICollection, IEnumerable
[SerializableAttribute]
[ComVisibleAttribute(true)]
public ref class Evidence sealed : ICollection, IEnumerable
/** @attribute SerializableAttribute() */
/** @attribute ComVisibleAttribute(true) */
public final class Evidence implements ICollection, IEnumerable
SerializableAttribute
ComVisibleAttribute(true)
public final class Evidence implements ICollection, IEnumerable
备注
证据的一般形式包括签名和代码源的位置，但可能为任何形式。由安全策略识别的任何类型的对象都表示证据。
安全策略由代码组组成；某个特定的程序集（授予安全权限的代码的基本单位）如果满足代码组的成员条件，则它是该代码组的成员。证据是对策略的一组输入，成员条件使用它来确定程序集属于哪个代码组。
Evidence 类是一个集合（请参见 ICollection），它持有一组表示证据的对象。该类持有两个与证据源（主机证据和程序集证据）对应的集合。
当计算代码的权限时，策略可以从两个不同的源获取证据。
Host evidence 是由主机提供的，并且只有已被授予 ControlEvidence 权限的主机才能提供该证据。通常，这是代码源和程序集上数字签名的证据。有关源的证据通常包括 Url、Site 和 Zone 证据。签名引用发行者（AuthentiCode X.509v3 签名）和强名称标识。两种基于数字签名的标识都被内置在程序集中，但必须由主机进行验证并传递到策略；当加载时，安全系统验证签名。只有当相应的签名有效时，系统才创建适当的证据并将其传递到策略。
Assembly evidence 是程序集本身的一部分。开发人员或管理员可以将自定义证据附加到程序集以扩展策略的证据集。只能在程序集生成时添加程序集证据，程序集生成发生在程序集被签名之前。安全系统的默认策略忽略程序集提供的证据，但可以扩展策略以接受该证据。
示例
下面的代码示例演示如何使用主机证据和程序集证据创建新的 Evidence 类。
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
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;
}
}
}
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;
}
}
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
继承层次结构
System.Object
System.Security.Policy.Evidence
线程安全
此类型的任何公共静态（Visual Basic 中的 Shared）成员都是线程安全的，但不保证所有实例成员都是线程安全的。
平台
Windows 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。
版本信息
.NET Framework
受以下版本支持：2.0、1.1、1.0
.NET Compact Framework
受以下版本支持：2.0、1.0