我使用如下代码进行源码动态编译:

//获取WSDL
                    WebClient wc = new WebClient();
                    Stream stream = wc.OpenRead(url + "?WSDL");
                    ServiceDescription sd = ServiceDescription.Read(stream);
                    ServiceDescriptionImporter sdi = new ServiceDescriptionImporter();
                    sdi.AddServiceDescription(sd, "", "");
                    CodeNamespace cn = new CodeNamespace(@namespace);

                    //生成客户端代理类代码
                    CodeCompileUnit ccu = new CodeCompileUnit();
                    ccu.Namespaces.Add(cn);
                    sdi.Import(cn, ccu);
                    CSharpCodeProvider csc = new CSharpCodeProvider();
                    // ICodeCompiler icc = csc.CreateCompiler();  

                    //设定编译参数
                    CompilerParameters cplist = new CompilerParameters();
                    cplist.GenerateExecutable = false;
                    //cplist.GenerateInMemory = true;
                    cplist.GenerateInMemory = false;
                    cplist.OutputAssembly = assemblyname;

                    cplist.ReferencedAssemblies.Add("System.dll");
                    cplist.ReferencedAssemblies.Add("System.XML.dll");
                    cplist.ReferencedAssemblies.Add("System.Web.Services.dll");
                    cplist.ReferencedAssemblies.Add("System.Data.dll");

                    //编译代理类
                    CompilerResults cr = csc.CompileAssemblyFromDom(cplist, ccu);

                    if (true == cr.Errors.HasErrors)
                    {
                        System.Text.StringBuilder sb = new System.Text.StringBuilder();
                        foreach (System.CodeDom.Compiler.CompilerError ce in cr.Errors)
                        {
                            sb.Append(ce.ToString());
                            sb.Append(System.Environment.NewLine);
                        }
                        throw new Exception(sb.ToString());
                    }                   

                    assembly = cr.CompiledAssembly;

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编译完成后，在D:/CacheTemp/下能找到动态生成的DLL。但是，在

assembly = cr.CompiledAssembly;  这一步却发生异常，提示说未能找到程序集，没有授予运行权限。
这个该怎么处理呢？