存储图片没法显示的问题 求教大侠！

Question

存储图片代码:
        private void buttonX4_Click(object sender, EventArgs e)
        {
            OpenFileDialog openfile = new OpenFileDialog(); 
            openfile.Title = "请选择图片"; 
            openfile.Filter = "图片(*.jpg;*.bmp;*png)|*.jpeg;*.jpg;*.bmp;*.png|AllFiles(*.*)|*.*";
            if (DialogResult.OK == openfile.ShowDialog())
            {
                try
                {
                    Bitmap bmp = new Bitmap(openfile.FileName);
                    pictureBox1.Image = bmp;
                    pictureBox1.SizeMode = PictureBoxSizeMode.Zoom;
                    MemoryStream ms = new MemoryStream();
                    bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
                    byte[] arr = new byte[ms.Length];
                    ms.Position = 0;
                    ms.Read(arr, 0, (int)ms.Length);
                    ms.Close();
                    pic = Convert.ToBase64String(arr);                 }
                catch { } 
            }  private void buttonX1_Click(object sender, EventArgs e)
        {
            mymeans.getsqlcom("insert into tb_student values ('" + textBoxX1.Text + "','" + textBoxX2.Text + "','" + textBoxX3.Text + "','" + comboBoxEx1.Text + "','" + textBoxX4.Text + "','" + textBoxX5.Text + "','" +pic + "','" + textBoxX6.Text + "','" + textBoxX7.Text + "')");}读取图片代码：
               mymeans.conn_open();
                    dt=mymeans.getDataTable("select Photo from tb_student where StuId='"+textBoxX1.Text+"'");
                    pic = dt.Rows[0].ItemArray[0].ToString());
                    try 
                    {
                        if (!string.IsNullOrEmpty(pic))
                        {
                            byte[] imageBytes = Convert.FromBase64String(pic);
                            MemoryStream memoryStream = new MemoryStream(imageBytes, 0, imageBytes.Length);
                            memoryStream.Write(imageBytes, 0, imageBytes.Length);
                            Image image = Image.FromStream(memoryStream);
                            this.pictureBox1.SizeMode = PictureBoxSizeMode.Zoom;
                            this.pictureBox1.Image = image;
                        }
                    }
                    catch { }}
大家给我看看 ：
数据库中Photo字段为image类型
存储图片后出现  《二进制数据》但在读取数据的时候不显示图片
if (!string.IsNullOrEmpty(pic))//这句执行了//这一段好像没有执行
byte[] imageBytes = Convert.FromBase64String(pic);
 MemoryStream memoryStream = new MemoryStream(imageBytes, 0, imageBytes.Length);
memoryStream.Write(imageBytes, 0, imageBytes.Length);
 Image image = Image.FromStream(memoryStream);
this.pictureBox1.SizeMode = PictureBoxSizeMode.Zoom;
  this.pictureBox1.Image = image;求教！求教大侠！

Answer 1

把try .....catch注释了调试看看什么问题？？

Answer 2

没有执行说明if条件不满足，或者直接报错到了catch部分，调试看看是哪种情况

Answer 3

绝对是报错了啊，，，在catch里面吧异常抛出来

Answer 4

if (!string.IsNullOrEmpty(pic)) 
{    MessageBox.Show("你好！");//这句执行了    byte[] imageBytes = Convert.FromBase64String(pic);    MessageBox.Show("你好！");//这句没有执行    MemoryStream memoryStream = new MemoryStream(imageBytes, 0, imageBytes.Length);
    memoryStream.Write(imageBytes, 0, imageBytes.Length);
    Image image = Image.FromStream(memoryStream);
    this.pictureBox1.SizeMode = PictureBoxSizeMode.Zoom;
    this.pictureBox1.Image = image; }
  

Answer 5

去掉try....catch后出现以下错误：
输入的不是有效的 Base-64 字符串，因为它包含非 Base-64 字符、两个以上的填充字符，或者填充字符间包含非空白字符。
麻烦大侠给我看看怎么修改才正确！

Answer 6

我发现错误的原因就在这一句
pic = dt.Rows[0].ItemArray[0].ToString();
求大侠教我如歌修改这一句！