C# 从db到picturebox WinC窗体显示图像#

我正在使用winforms应用程序将图像插入数据库（sql server 2008），并将图像从数据库检索到图片框中。插入的代码工作正常。虽然检索显示的代码出现错误，但参数无效。我尝试了通过目测找到的各种解决方案，但均未成功

这是我的检索代码

           private void button2_Click(object sender, EventArgs e)
            {
 FileStream fs1 = new FileStream("D:\\4usdata.txt", FileMode.OpenOrCreate,FileAccess.Read);
        StreamReader reader = new StreamReader(fs1);
        string id = reader.ReadToEnd();
        reader.Close();
        int ide = int.Parse(id);
        con.Open();
        SqlCommand cmd = new SqlCommand("select img from tempdb where id='" + id + "'", con);
        //cmd.CommandType = CommandType.Text;
        //object ima = cmd.ExecuteScalar();
        //Stream str = new MemoryStream((byte[])ima);
        //pictureBox1.Image = Bitmap.FromStream(str);
        SqlDataAdapter dp = new SqlDataAdapter(cmd);
        DataSet ds = new DataSet();
        dp.Fill(ds);
        int c = ds.Tables[0].Rows.Count;
        if (c ==1)
        {


            Byte[] MyData = new byte[0];
            MyData = (Byte[])ds.Tables[0].Rows[0]["img"];
            MemoryStream stream = new MemoryStream(MyData);
            stream.Position = 0;
            pictureBox1.Image = Image.FromStream(stream);

        }

    }

请尝试以下代码：

要存储到数据库中，请执行以下操作：

public byte[] WinImage=new byte[0];
MemoryStream stream = new MemoryStream();
PictureBox.Image.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);
WinImage=stream.ToArray();

MemoryStream stream = new MemoryStream(byte[] WinImage);
Image RetImage = Image.FromStream(stream);
PictureBox.Image = RetImage;

并将其作为varbinary（max）保存到表中

要从数据库检索图像，请执行以下操作：

public byte[] WinImage=new byte[0];
MemoryStream stream = new MemoryStream();
PictureBox.Image.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);
WinImage=stream.ToArray();

MemoryStream stream = new MemoryStream(byte[] WinImage);
Image RetImage = Image.FromStream(stream);
PictureBox.Image = RetImage;

---

您可以这样做，

Byte[] MyData = new byte[0];

MyData = (Byte[])ds.Tables[0].Rows[0]["img"];

if (MyData != null && MyData .Length > 0)  
{
    string img = Convert.ToBase64String(MyData , 0, MyData.Length);

    pictureBox1.ImageUrl = "data:image/png;base64," + img;
}

---

首先，您必须考虑图像数据库中的数据类型必须是ValBoo: < /P> 在按钮单击事件中：

byte[] getImg=new byte[0];
SqlDataAdapter da = new SqlDataAdapter();
SqlCommand cmd = new SqlCommand("select img from tempdb where id='" + id + "'", con);
cmd.CommandType=CommandType.Text;
DataSet ds = new DataSet();
da.Fill(ds);
foreach(DataRow dr in ds.Tables[0].Rows)
{
   getImg=(byte[])dr["img"];
}

byte[] imgData=getImg;
MemoryStream stream = new MemoryStream(imgData);
pictureBox1.Image=Image.FromStream(stream);
}

---

数据库中的

img

字段的类型是什么？@RagingBull img字段是图像类型何时处理

stream

？当我在设置PictureBox.Image=Image.FromStream（stream）之后尝试处理它时，我得到一个ObjectDisposedException。让小溪无限期地流淌似乎不明智。