System.CodeDom.Compiler.CodeCompiler.FromFileBatch C# (CSharp) Method

        protected virtual CompilerResults FromFileBatch(CompilerParameters options, string[] fileNames) {
            if( options == null) {
                throw new ArgumentNullException("options");
            }
            if (fileNames == null)
                throw new ArgumentNullException("fileNames");

            new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Demand();

            string outputFile = null;
            int retValue = 0;

            CompilerResults results = new CompilerResults(options.TempFiles);
            SecurityPermission perm1 = new SecurityPermission(SecurityPermissionFlag.ControlEvidence);
            perm1.Assert();
            try {
               results.Evidence = options.Evidence;
            }
            finally {
                 SecurityPermission.RevertAssert();
            }
            bool createdEmptyAssembly = false;

            if (options.OutputAssembly == null || options.OutputAssembly.Length == 0) {
                string extension = (options.GenerateExecutable) ? "exe" : "dll";
                options.OutputAssembly = results.TempFiles.AddExtension(extension, !options.GenerateInMemory);

                // Create an empty assembly.  This is so that the file will have permissions that
                // we can later access with our current credential.  If we don't do this, the compiler
                // could end up creating an assembly that we cannot open 
                new FileStream(options.OutputAssembly, FileMode.Create, FileAccess.ReadWrite).Close();
                createdEmptyAssembly = true;
            }

            results.TempFiles.AddExtension("ildb");


            string args = CmdArgsFromParameters(options) + " " + JoinStringArray(fileNames, " ");

            // Use a response file if the compiler supports it
            string responseFileArgs = GetResponseFileCmdArgs(options, args);
            string trueArgs = null;
            if (responseFileArgs != null) {
                trueArgs = args;
                args = responseFileArgs;
            }

            Compile(options, Executor.GetRuntimeInstallDirectory(), CompilerName, args, ref outputFile, ref retValue, trueArgs);

            results.NativeCompilerReturnValue = retValue;

            // only look for errors/warnings if the compile failed or the caller set the warning level
            if (retValue != 0 || options.WarningLevel > 0) {

                FileStream outputStream = new FileStream(outputFile, FileMode.Open,
                    FileAccess.Read, FileShare.ReadWrite);
                try {
                    if (outputStream.Length > 0) {
                        // The output of the compiler is in UTF8
                        StreamReader sr = new StreamReader(outputStream, Encoding.UTF8);
                        string line;
                        do {
                            line = sr.ReadLine();
                            if (line != null) { 
                                results.Output.Add(line);

                                ProcessCompilerOutputLine(results, line);
                            }
                        } while (line != null);
                    }
                }
                finally {
                    outputStream.Close();
                }

                // Delete the empty assembly if we created one
                if (retValue != 0 && createdEmptyAssembly)
                    File.Delete(options.OutputAssembly);
            }

            if (!results.Errors.HasErrors && options.GenerateInMemory) {
                FileStream fs = new FileStream(options.OutputAssembly, FileMode.Open, FileAccess.Read, FileShare.Read);
                try {
                    int fileLen = (int)fs.Length;
                    byte[] b = new byte[fileLen];
                    fs.Read(b, 0, fileLen);
                    SecurityPermission perm = new SecurityPermission(SecurityPermissionFlag.ControlEvidence);
                    perm.Assert();
                    try {
                       results.CompiledAssembly = Assembly.Load(b,null,options.Evidence);
                    }
                    finally {
                       SecurityPermission.RevertAssert();
                    }
                }
                finally {
                    fs.Close();
                }
            }
            else {

                results.PathToAssembly = options.OutputAssembly;
            }

            return results;
        }