实例化了filestream并close了，但是在binarywriter写入二进制流时显示stream was not writable

尝试做dat文件的存档，在filestream了一个saveinfo类，目录是正确的，实例化了，filemode是openorcreate fileaccess是readwrite

并且close了saveinfo类

建立了一个binarywriter sv1的二进制写入，并且实例化

但是在尝试创建存档写入数据的时候，就会报错：stream was not writable“流没有写入权限”

报错图片如下

 整段代码如下

int firstlevel = 1;
                int firstcoin = 1;
                int firstrainbowstone = 0;
                int firstlevelexp = 0;
                int firstcharactorexp = 0;
                Directory.CreateDirectory(System.AppDomain.CurrentDomain.BaseDirectory + @"\saves\save1");//新建存档一文件夹
                FileStream save1 = File.Create(System.AppDomain.CurrentDomain.BaseDirectory + @"\saves\save1\save1.dat");//新建存档一信息并初始化
                save1.Close();
                FileStream saveinfo = new FileStream(System.AppDomain.CurrentDomain.BaseDirectory + @"\saves\save1\save1.dat", FileMode.OpenOrCreate,FileAccess.ReadWrite);
                saveinfo.Close();
                BinaryWriter sv1 = new BinaryWriter(saveinfo);
                //写入二进制数据
                sv1.Write(firstlevel);
                sv1.Write(firstcoin);
                sv1.Write(firstrainbowstone);
                sv1.Write(firstlevelexp);
                sv1.Write(firstcharactorexp);
                sv1.Close();

saveInfo提前关闭了，save1.Close();放到倒数第二行