Question

这是我的代码：

try
{
    connection.Open();
    OleDbCommand command = new OleDbCommand();
    command.Connection = connection;
    string query = "select * from StudentInformation where [StudentID] = " + txtStudentID.Text + "";
    command.CommandText = query;
    OleDbDataReader read = command.ExecuteReader();

    while (read.Read())
    {
       txtStudentID.Text = (read["StudentID"].ToString());
       txtFirstname.Text = (read["Firstname"].ToString());
       txtLastname.Text = (read["Lastname"].ToString());

        byte[] imgbyte = (byte[])read["Image"];    //when i add this a got error with this code
        MemoryStream ms = new MemoryStream(imgbyte);
        StudentPicture.Image = Image.FromStream(ms);
    }

    connection.Close();
}
catch (Exception ex)
{
    MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}

我收到错误“参数无效” 有人可以帮帮我吗？我很困惑！我尝试了所有搜索但仍然错误的代码：'（对不起，我的英语不好非常感谢您的回复......

Answer 1

尝试获取这样的字节数组：

var binLength = read.Item[3].Length;
byte[] imgByte = new byte[binLength - 1];
var bytes = read.GetBytes(0,0,imgByte,0,imgByte.Length);
MemoryStream ms = new MemoryStream(imgByte);
StudentPicture.Image = Image.FromStream(ms);

使用c＃将数据库访问中的长二进制数据转换为图像

1 个答案: