error-Parameter is not valid.

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Hello friends,

I try to retrieve an image from access database using following code:

C#

private void button3_Click(object sender, EventArgs e)
{
  OleDbConnection cn = new OleDbConnection(strCn);
  cn.Open();
  OleDbCommand cmd = new OleDbCommand("SELECT Iname,Oimage FROM [Image]", cn);
  OleDbDataAdapter da = new OleDbDataAdapter(cmd);
  DataSet ds = new DataSet();
  da.Fill(ds, "Image");
  int c = ds.Tables["Image"].Rows.Count;
  if (c > 0)
  {
    Byte[] byteOimage = new Byte[0];
    byteOimage = System.Text.Encoding.Unicode.GetBytes((ds.Tables["Image"].Rows[c - 1]["Oimage"]).ToString());
    MemoryStream strOimage = new MemoryStream(byteOimage);
    pictureBox1.Image = Image.FromStream(strOimage);//here i got error message Parameter is not valid.
  }
  cn.Close();
}

I mention in the last to second line of my code that I get the error.
So,how can I solve it?

Please help me.

Thanks in advance.

Posted 28-Dec-10 7:49am

jhon275

Updated 28-Dec-10 8:30am

JF2015

v4

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Marc A. Brown 28-Dec-10 13:54pm

Formatted code block.

3 solutions

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Not Active · Answer 1 · 2010-12-28T08:44:00

Solution 1

You are trying to use a zero length byte array, there is nothing in it

Byte[] byteOimage = new Byte[0];

C# Photo Album Viewer[^]

Look at the Display the image section. Although it is SQL Server, the same techniques should work with Access.

BTW, Hungarian notation (byteOimage, strOimage) hasn't bee used in years.

Posted 28-Dec-10 8:44am

Not Active

Comments

Manfred Rudolf Bihy 28-Dec-10 14:52pm

It's one of these useless initializations as he's overwriting the byteOimage variable in the next line :)

maheswariragu · Answer 2 · 2010-12-28T09:09:00

I too faced the same issue and solution given below :-

C#

OleDbConnection cn = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Users\rmaheswari\Documents\TestImage.accdb;Persist Security Info=False;"); 
            cn.Open();  OleDbCommand cmd = new OleDbCommand("SELECT Iname,Oimage FROM [Table1]", cn); 
            OleDbDataAdapter da = new OleDbDataAdapter(cmd);  
            DataSet ds = new DataSet();  da.Fill(ds, "Image");  
            int c = ds.Tables["Image"].Rows.Count;  if (c > 0)
            {
                byte[] rawData = (byte[])ds.Tables["Image"].Rows[c - 1]["Oimage"];
                MemoryStream ms = new MemoryStream();
                Bitmap bm;
                ms.Write(rawData, 78, rawData.Length - 78);
                bm = new Bitmap(ms);
                pictureBox1.Image = bm;
               
            }  cn.Close();}

William Winner · Answer 3 · 2010-12-28T09:40:00

This is your problem code:

C#

byteOimage = System.Text.Encoding.Unicode.GetBytes((ds.Tables["Image"].Rows[c - 1]["Oimage"]).ToString());

Access stores the data as a byte array. But then you take that byte array and convert it to a string.

Step through your code and put a breakpoint in at that line. Then, add a watch for ds.Tables["Image"].Rows[c - 1]["0image"]).ToString() and see what it says.

Just get rid of the ToString() on that line. You may also have to type cast it as in the other answer.

error-Parameter is not valid.

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