在C#中搜索带回多行 - datagrid视图

时间:2014-03-03 09:51:06

标签: c# sql datagridview duplicates rows

好的,所以我有一个功能,可以根据数字在数据库中搜索记录,然后在数据网格中显示,这曾经工作正常,但出于某种原因,当我复制代码时,它现在会带来一个返回DB中的每一列(使用正确的数据)。例如,第1行只显示数据网格中的一行,但只显示第一列,然后第二行将包含前两列,依此类推....

无论如何,这是我的代码

        dataGridView1.DataSource = null;
        dataGridView1.Rows.Clear();
        dataGridView1.Refresh();

        string strprovider = @"BLANKED OUT INFO HERE";
        string strsql = "Select * from OCR where OCR like '" + textBox4.Text + "%'";

        OleDbConnection newConn = new OleDbConnection(strprovider);
        OleDbCommand dbCmd = new OleDbCommand(strsql, newConn);

        newConn.Open();
        dbCmd.CommandType = CommandType.Text;
        OleDbDataReader dr = dbCmd.ExecuteReader();


        if (textBox4.Text == "")
        {
            MessageBox.Show("Please Enter a Valid OCR Number", "Error", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
        }

        else
        {

            if (dr.HasRows)
            {
                // ....
            }
            else
            {
                MessageBox.Show("No Record Found", "Error", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
            }
            int columncount = dr.FieldCount;
            string[] rowdata = new string[columncount];
            while (dr.Read())
            {
                for (int k = 0; k < columncount; k++)
                {

                    switch (dr.GetFieldType(k).ToString())
                    {
                        case "System.Int32":
                            rowdata[k] = dr.GetInt32(k).ToString();
                            break;

                        case "System.DateTime":
                            rowdata[k] = dr.GetDateTime(k).ToString();
                            break;

                        case "System.String":
                            rowdata[k] = dr.GetString(k);
                            break;
                    }

                    dataGridView1.Rows.Add(rowdata);
                }

            }

        }

    }

1 个答案:

答案 0 :(得分:1)

尝试在for循环后添加行:

        while (dr.Read())
        {
            for (int k = 0; k < columncount; k++)
            {

                switch (dr.GetFieldType(k).ToString())
                {
                    case "System.Int32":
                        rowdata[k] = dr.GetInt32(k).ToString();
                        break;

                    case "System.DateTime":
                        rowdata[k] = dr.GetDateTime(k).ToString();
                        break;

                    case "System.String":
                        rowdata[k] = dr.GetString(k);
                        break;
                }

                //dataGridView1.Rows.Add(rowdata); <= This shouldn't be here
            }
          //Add row after loop completes all columns
          dataGridView1.Rows.Add(rowdata);
        }