c#将文件复制到某个文件夹内winform文件复制

try
            {
                //系统盘
                string nl = Environment.NewLine;
                string query = "%SystemRoot%";
                string str = Environment.ExpandEnvironmentVariables(query);
                string str32Path = str + @"System32crypto.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;
            }