How to create Master Detail from datagridview

问题

this code inserts in the database

 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();
    }

then this is for datagridview

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);

    }

am using the cell click event, such that when a cell is clicked, the contents of that row, that is the CCImage and CCSpn_CODE appear. The CCSpn_CODE appears in Ptxtspn_code textBox just fine. The problem is the byte[] image that i'm converting. it's displaying only the image of the first row. how can i make PpicBox display whatever image from whatever row i click on the datagridViewjust like Ptxtspn_code textBox

 private void abaanaCCDataGridView_CellClick(object sender, DataGridViewCellEventArgs e)
    {
            this.Ptxtspn_code.Text = this.abaanaCCDataGridView.SelectedRows[0].Cells[this.dataGridViewTextBoxColumn2.Name].Value.ToString();
this.abaanaCCTableAdapter.Fill(this.abaanaDataSet.abaanaCC);           
byte[] mydata = (byte[])this.abaanaDataSet.abaanaCC.Rows[0]["CCImage"];
          MemoryStream stream = new MemoryStream(mydata);           
         this.PpicBox.Image =Image.FromStream(stream);

 }

回答1:

Note:

In CellClick event you should check if click is not on row header or column header
e.RowIndex is row index of clicked cell, and e.ColumnIndex is index of column of clicked cell
To get values of clicked row you can use:
- yourDGV.Rows[e.RowIndex].Cells["GridColumnName"].value
- yourDGV.Rows[e.RowIndex].Cells[2].Value
- ((DataRowView)yourDGV.Rows[e.RowIndex].DataBoundItem)[2]
- ((DataRowView)yourDGV.Rows[e.RowIndex].DataBoundItem)["DataTableColumnName"]
I didn't have any idea about why you fill abaanaCC in CellClick because you load data in form load event and so all values including CCImage is present id your data table. So I removed it. It seems that you should fill it only when you want to load data not here in cell click.

For example your code may like this:

private void abaanaCCDataGridView_CellClick(object sender, DataGridViewCellEventArgs e)
{
    if (e.RowIndex < 0 || e.ColumnIndex < 0)
        return;

    this.Ptxtspn_code.Text = this.abaanaCCDataGridView.Rows[e.RowIndex].Cells[this.dataGridViewTextBoxColumn2.Name].Value.ToString();       
    byte[] mydata = (byte[])this.abaanaDataSet.abaanaCC.Rows[r.RowIndex]["CCImage"];
    MemoryStream stream = new MemoryStream(mydata);           
    this.PpicBox.Image =Image.FromStream(stream);
}

来源：https://stackoverflow.com/questions/32853725/how-to-create-master-detail-from-datagridview

标签

winforms

datagridview

master-detail