无法将类型为“ System.Byte []”的对象转换为类型为“ System.String []”的对象

Question

Hello I'm trying to pass image converted from Byte[] to String[] and display it in ReportViewer Image as following:

String[] dataImage;
private void showLogo()
{
    try
    {
        SqlDataAdapter dataAdapter = new SqlDataAdapter( new SqlCommand("SELECT logo
                                           FROM company WHERE id = 1", spojeni));
        DataSet dataSet = new DataSet();
        dataAdapter.Fill(dataSet);
        if (dataSet.Tables[0].Rows.Count == 1)
        {
            dataImage = new String[0];
            dataImage = (String[])(dataSet.Tables[0].Rows[0]["logo"]);
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(""+ex);
    }
}

And this is the ReportViewer parameter:

ReportParameter[] parameter = new ReportParameter[24];
parameter[23] = new ReportParameter("rp_logo", dataImage );
this.reportViewer1.LocalReport.SetParameters(parameter);
this.reportViewer1.RefreshReport();

But I get following Exception Unable to cast object of type 'System.Byte[]' to type 'System.String[]'

Can someone help me solve this?

Thank you for your time.

Answer 1

Given ReportViewer requires a path to an image and not the actual image data itself, your best bet here is to save your byte[] to disk and reference this in the parameter instead eg

using (var cmd = new SqlCommand("SELECT logo FROM company WHERE id = 1", spojeni))
using (var dataAdapter = new SqlDataAdapter(cmd))
using (var dataSet = new DataSet())
{
    dataAdapter.Fill(dataSet);
    if (dataSet.Tables[0].Rows.Count == 1)
    {
        // generate temp file destination
        dataImage = System.IO.Path.GetTempFileName() + ".jpg"; // use whatever extension you expect the file to be in
        File.WriteAllBytes(dataImage, (byte[])dataSet.Tables[0].Rows[0]["logo"]); // save image to disk
    }

}

Answer 2

byte to string conversion can be done the following way

 Encoding.Ascii.GetString(yourByteArray)

if you need a further conversion you can do somthing like that:

Encoding.Ascii.GetString(yourByteArray).Select(c => c as string).ToArray()