try            {                //系统盘                string nl = Environment.NewLine;                string query = "%SystemRoot%";                string str = Environment.ExpandEnvironmentVariables(query);                string str32Path = str + @"\System32\crypto.dll";            var filePath64 = @"key/32dll/crypto.dll";                //验证系统盘system32与是否有dll，有则跳过，无则复制                               if (!File.Exists(str32Path))                {                                   File.Copy(filePath32, str32Path);                }                            return true;            }            catch (Exception ex)            {                                MessageBox.Show("导入dll到系统盘失败，错误原因为："+ex.Message);                return false;            }