我正在创建一个应用程序，它将连接到几个sql数据库并从数据库中获取一些细节，
在此应用程序中，我必须加密数据库连接详细信息，例如用户名密码。是的，它的直接和简单的pritty只是写一个metod来解密凭证。
但在我的情况下，我必须依靠第三方encription mechanisam来解密凭据。更多的我必须连接到几个sql服务器，这将再次使用一些其他加密方法。因此，我的应用程序动态加载加密程序集并调用加密方法。
但是当我加载程序集表单Assembly.LoadFile（“Path”）时，我无法卸载已加载的程序集。我想我已经在单独的应用程序域中加载此程序集并调用relavant方法并卸载该appdomain。我需要一些帮助。由于我缺乏knoladge，我无法调用所需的方法。我的代码如下。请帮帮我。
类ApplicationSettings {
private static ApplicationSettings m_ApplicationSettings;
public String m_ServerName { get; private set; }
public String m_DatabaseName { get; private set; }
public String m_UserID { get; private set; }
public String m_Password { get; private set; }
public String m_EncryptionDLLPath{ get; private set; }
public String m_NameSpace { get; private set; }
public String m_ClassName { get; private set; }
public String m_EncryptionMethodName { get; private set; }
public String m_DecryptionMethodName { get; private set; }
private ApplicationSettings()
{
m_ApplicationSettings = this;
}
public static ApplicationSettings CurrentValues
{
get
{
return m_ApplicationSettings;
}
private set
{
m_ApplicationSettings = value;
}
}
internal static void Initialize()
{
CommonFunctions.DataEncryption _enc = new CommonFunctions.DataEncryption();
ApplicationSettings.CurrentValues = new ApplicationSettings();
ApplicationSettings.CurrentValues.m_EncryptionDLLPath = @"C:\Users\Administrator\Documents\Visual Studio 2010\Projects\TestApp\TestApp\bin\Debug\AppSec.dll";
ApplicationSettings.CurrentValues.m_NameSpace = "AppSec";
ApplicationSettings.CurrentValues.m_ClassName = "AppSecEncDec";
ApplicationSettings.CurrentValues.m_EncryptionMethodName = "Encrypt";
ApplicationSettings.CurrentValues.m_DecryptionMethodName = "Decrypt";
ApplicationSettings.CurrentValues.m_Password = _enc.Decrypt("pzBS3EJDoGM=");
ApplicationSettings.CurrentValues.m_UserID = "sa";
}
}
类DataEncryption {
AppDomain DomainName;
//Call the Encryption Method
public String Encrypt(Object _DataToEncrypt)
{
}
//Call the Decryption Method
public String Decrypt(Object _DataToDecrypt)
{
String _Decrypt = "";
String assemblyFileName = ApplicationSettings.CurrentValues.m_EncryptionDLLPath;
String assemblyName = ApplicationSettings.CurrentValues.m_NameSpace;
//Setup the evidence
Evidence evidence = new Evidence(AppDomain.CurrentDomain.Evidence);
AppDomain TestDomain = AppDomain.CreateDomain(
"TestDomain", //The friendly name of the domain.
evidence, //Evidence mapped through the security policy to establish a top-of-stack permission set.
AppDomain.CurrentDomain.BaseDirectory, // The base directory that the assembly resolver uses to probe for assemblies.
System.IO.Path.GetFullPath(assemblyFileName), // The path relative to the base directory where the assembly resolver should probe for private assemblies.
true // If true, a shadow copy of an assembly is loaded into this application domain.
);
string s = TestDomain.Load(assemblyName).FullName;
string[] myparam = new String[1];
myparam[0] = "test";
TestDomain.CreateInstance(TestDomain.Load(assemblyName).GetName().ToString(), ApplicationSettings.CurrentValues.m_NameSpace + "." + ApplicationSettings.CurrentValues.m_ClassName).CreateObjRef(GetType());
//her i need to execute the Encrypt method which will load form the third party encryption mechanisam
//method name will be returnd on this parameter in application settings Classes.ApplicationSettings.CurrentValues.m_EncryptionMethodName ;
UloadAssembly();
return _Decrypt;
}
public void UloadAssembly()
{
//Unload the loaded appdomain
AppDomain.Unload(DomainName);
GC.Collect();
}
}
提前致谢。
答案 0 :(得分：0)
我已经想出如何做到这一点，并希望完全成功，请找到以下代码，如果用于过度的情况
public String Encrypt(Object _DataToEncrypt)
{
try
{
String _Encrypt = "";
LoadAssembly();
ShowLoadedAssemblies();
if (ClassInstance != null)
{
MethodInfo EncryptionMethod = ClassInstance.GetType().GetMethod(Classes.ApplicationSettings.CurrentValues.m_EncryptionMethodName); ;
if (EncryptionMethod != null)
{
object[] myparam = new object[1];
myparam[0] = _DataToEncrypt;
_Encrypt = (string)EncryptionMethod.Invoke(null, myparam);
}
}
UloadAssembly();
ShowLoadedAssemblies();
return _Encrypt;
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
//Call the Decryption Method
public String Decrypt(Object _DataToDecrypt)
{
String _Decrypt = "";
LoadAssembly();
ShowLoadedAssemblies();
if (ClassInstance != null)
{
MethodInfo DecryptionMethod = ClassInstance.GetType().GetMethod(Classes.ApplicationSettings.CurrentValues.m_DecryptionMethodName);;
if (DecryptionMethod != null)
{
object[] myparam = new object[1];
myparam[0] = _DataToDecrypt;
_Decrypt = (string)DecryptionMethod.Invoke(null, myparam);
}
}
UloadAssembly();
ShowLoadedAssemblies();
return _Decrypt;
}
//Loading the Assembly
public void LoadAssembly()
{
Evidence evi = new Evidence(AppDomain.CurrentDomain.Evidence);
DomainName = AppDomain.CreateDomain(Classes.ApplicationSettings.CurrentValues.m_NameSpace
, evi
, AppDomain.CurrentDomain.BaseDirectory
, Classes.ApplicationSettings.CurrentValues.m_EncryptionDLLPath
, true
);
String LoadingAssemblyName = AssemblyName.GetAssemblyName(Classes.ApplicationSettings.CurrentValues.m_EncryptionDLLPath).FullName;
ClassInstance = DomainName.CreateInstanceAndUnwrap(LoadingAssemblyName
, Classes.ApplicationSettings.CurrentValues.m_NameSpace
+ "."
+ Classes.ApplicationSettings.CurrentValues.m_ClassName
);
}
public void UloadAssembly()
{
//Unload the loaded appdomain
AppDomain.Unload(DomainName);
GC.Collect();
}