数据中继器不显示图像

Question

我需要一些帮助。我用过数据中继器来显示 数据库中的值，所有列都显示转发器上文本框中的值，但图像除外。无法将字节转换回图像 这是我保存到数据库的代码

private void btnSave_Click(object sender, EventArgs e)
{
    byte[] imageBt = null;
    FileStream fstream = new FileStream(this.txtImgPath.Text,FileMode.Open,FileAccess.Read);
    BinaryReader Br = new BinaryReader(fstream);
    imageBt = Br.ReadBytes((int)fstream.Length);
    // byte[] pic = stream.ToArray();
    try
    {
        conDB.Open();
        OleDbCommand command = new OleDbCommand();
        command.Connection = conDB;
        command.CommandText = "insert into abaanaCC (CCSpn_CODE,CCFname,CCLname,CCMname,CCDOB,CCgender,CCSchool,CaClass,CCVillage,CCSiblings,CCGuardian,CCContact,CCImage)" +
                " values ('" + spn_codetxt.Text + "','" + txtfname.Text + "','" + lnametxt.Text + "','" + mnametxt.Text + "','" + DOBDTPicker1.Text + "','" + gendercomboBox.Text + "','" + schtxt.Text + "','" + classcomboBox.Text + "','" + villatxt.Text + "','" + siblingscombobx.Text + "','" + guardiantxt.Text + "','" + contacttxt.Text + "',@IMG) ";
        command.Parameters.Add(new OleDbParameter("@IMG",imageBt));
        //command.Parameters.AddWithValue("@IMG",pic);
        command.ExecuteNonQuery();
        MessageBox.Show("Record Saved");
    }
    catch (Exception ex)
    {
        MessageBox.Show("Unable to save" + ex);
    }
    conDB.Close();
}

然后是数据中继器

private void Update_Load(object sender, EventArgs e)
    {
        // TODO: This line of code loads data into the 'abaanaDataSet.abaanaCC' table. You can move, or remove it, as needed.
        this.abaanaCCTableAdapter.Fill(this.abaanaDataSet.abaanaCC);
        int c = this.abaanaDataSet.abaanaCC.Rows.Count;
        if (c > 0) ;
        {
            byte[] mydata = new byte[0];
            mydata = (byte[])(this.abaanaDataSet.abaanaCC.Rows[c-1]["CCImage"]);
            MemoryStream stream = new MemoryStream(mydata);
            cCImagePictureBox.Image = Image.FromStream(stream);

        }

}

Answer 1

确保您实际从数据集中获取有效的图像数据。这应该有效：

private void Form3_Load(object sender, EventArgs e)
{
    this.productPhotoTableAdapter.Fill(this.adventureWorks2014DataSet.ProductPhoto);

    byte[] mydata = (byte[])this.adventureWorks2014DataSet.ProductPhoto[100]["LargePhoto"];
    MemoryStream stream = new MemoryStream(mydata);
    pictureBox1.Image = Image.FromStream(stream);
}