Question

尝试将数据库中的字节转换为要显示的图像时，到达此行时：

Image image = Image.FromStream(ms);

代码将以不同的形式跳转到表单加载。这有什么理由呢？

其余代码：

    private void dataGridView2_SelectionChanged(object sender, EventArgs e)
    {
        //try
        //{


            if (dataGridView2.SelectedCells.Count > 0)
            {
                int selectrowindex = dataGridView2.SelectedCells[0].RowIndex;
                DataGridViewRow selectrow = dataGridView2.Rows[selectrowindex];

                productID = Convert.ToString(selectrow.Cells[0].Value);
                productName.Text = Convert.ToString(selectrow.Cells[1].Value);
                productDetails.Text = ("Desc: " + Convert.ToString(selectrow.Cells[2].Value));
                productPrice.Text = (Convert.ToString(selectrow.Cells[4].Value));
                productStock.Text = Convert.ToString(selectrow.Cells[5].Value);

                db_connection();

                SqlCommand cmd = new SqlCommand("SELECT Image FROM PRODUCTS WHERE ProductID = @ProductID", connect);
                cmd.Parameters.AddWithValue("ProductID", productID);

                SqlDataReader reader = cmd.ExecuteReader();

                reader.Read();

                if (reader.HasRows)
                {
                    byte[] img = (byte[])(reader[0]);
                    if (img == null)
                    {
                        MessageBox.Show("Theres no image");
                        productPictureDisplay.Image = null;
                    }
                    else
                    {
                        MemoryStream ms = new MemoryStream(img);
                        Image image = Image.FromStream(ms);
                        productPictureDisplay.Image = image;
                    }
                }

                connect.Close();

            }
    }

Answer 1

尝试如下，并开始在代码中使用using，以便通过它处理事物（连接对象，内存流）

public Image byteArrayToImage(byte[] byteArrayIn)
{
    try
    {
       var ms = new MemoryStream(byteArrayIn);;
          return Image.FromStream(ms);
     }
    catch(Exception ex)
    { console.WriteLine(ex.Tostring()); }
    return returnImage;
}

将字节从SQL Server数据库转换为C＃中的图像

1 个答案: