c# - 在远程机器上使用 Assembly.LoadFrom() 加载的程序集导致 SecurityException

Question

我正在使用 Assembly.LoadFrom(fileName) 加载程序集。当 fileName 在本地机器上时，一切正常。但是，当相同的文件(和依赖项)位于远程网络共享上时，当我尝试从创建新的 SqlConnection远程程序集:

System.Security.SecurityException: Request for the permission of type 'System.Data.SqlClient.SqlClientPermission, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.

有什么治疗方法？

Answer 1

您可以将程序集作为字节加载并使用 Assembly.Load(bytes) 加载它，也许这可行。

或者您向应用程序授予所请求的权限。

编辑:

我做了一个小测试，它对我有用。这是一些代码:

static Dictionary<Assembly, String> _Paths = new Dictionary<Assembly, String>();

static void Main(string[] args)
{
    AppDomain current = AppDomain.CurrentDomain;
    current.AssemblyResolve += new ResolveEventHandler(HandleAssemblyResolve);

    // This line loads a assembly and retrieves all types of it. Only when
    // calling "GetTypes" the 'AssemblyResolve'-event occurs and loads the dependency
    Type[] types = LoadAssembly("Assemblies\\MyDLL.dll").GetTypes();
    // The next line is used to test permissions, i tested the IO-Permissions 
    // and the Reflection permissions ( which should be denied when using remote assemblies )
    // Also this test includes the creation of a Form
    Object instance = Activator.CreateInstance(types[0]);
}

private static Assembly LoadAssembly(string file)
{
    // Load the assembly
    Assembly result = Assembly.Load(File.ReadAllBytes(file));
    // Add the path of the assembly to the dictionary
    _Paths.Add(result, Path.GetDirectoryName(file));
    return result;
}

static Assembly HandleAssemblyResolve(object sender, ResolveEventArgs args)
{
    // Extract file name from the full-quallified name
    String name = args.Name;
    name = name.Substring(0, name.IndexOf(','));
    // Load the assembly
    return LoadAssembly(Path.Combine(_Paths[args.RequestingAssembly], name + ".dll"));
}

重要的事情:

可能有些文件没有匹配的名称和文件名，但您可以通过使用 AssemblyName.GetAssemblyName(file) 检查文件夹中的所有文件来解决此问题。