Question

我尝试使用以下代码复制数据表：

private void button1_Click(object sender, EventArgs e)
{
    DataTable dat = dGV.DataSource as DataTable;
    DataTable dt = new DataTable();
    dt = dat.Copy();
    dGV.DataSource = dt;
}

但是当我运行它时，第一行没有被复制。结果如下：

之前：https://drive.google.com/file/d/0B--Fi4mWsFk5NXlJM0ZRSXhRbjA/view?usp=sharing

之后：https://drive.google.com/file/d/0B--Fi4mWsFk5OFptY2ZPRHlNaWc/view?usp=sharing

如果在单击按钮之前将光标移动到第二行，它将复制包括第一行在内的所有数据。使用以下代码从excel导入数据：

private void importFileDialog_FileOk(object sender, CancelEventArgs e)
{
    dGV.DataSource = GetTable();
    string path = importFileDialog.FileName;
    string ext = Path.GetExtension(path);
    if (ext == ".xlsx" | ext == ".xls")
    {
        try
        {
            string Excel03ConString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties=Excel 8.0;";
            string Excel07ConString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=Excel 8.0;";
            string conStr, sheetName;
            conStr = string.Empty;
            switch (ext)
            {
                case ".xls": //Excel 97-03
                    conStr = string.Format(Excel03ConString, path);
                    break;
                case ".xlsx": //Excel 07
                    conStr = string.Format(Excel07ConString, path);
                    break;
            }

            //Get the name of the First Sheet.
            using (OleDbConnection con = new OleDbConnection(conStr))
            {
                using (OleDbCommand cmd = new OleDbCommand())
                {
                    cmd.Connection = con;
                    con.Open();
                    DataTable dtExcelSchema = con.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
                    sheetName = dtExcelSchema.Rows[0]["TABLE_NAME"].ToString();
                    con.Close();
                }
            }

            //Read Data from the First Sheet.
            using (OleDbConnection con = new OleDbConnection(conStr))
            {
                using (OleDbCommand cmd = new OleDbCommand())
                {
                    using (OleDbDataAdapter oda = new OleDbDataAdapter())
                    {
                        DataTable dt = new DataTable();
                        cmd.CommandText = "SELECT * From [" + sheetName + "]";
                        cmd.Connection = con;
                        con.Open();
                        oda.SelectCommand = cmd;
                        oda.Fill(dt);
                        con.Close();

                        //Populate DataGridView.
                        //dGV.DataSource = dt;
                        for (int i = 0; i < dt.Rows.Count; ++i)
                        {
                            //dGV.RowCount++;
                            //dGV.Rows[i].HeaderCell.Value = dt.Row[i].;
                            for (int k = 0; k < dt.Columns.Count; ++k)
                            {
                                dGV[k, i].Value = dt.Rows[i].ItemArray[k];
                            }
                        }
                    }
                }
            }
        }
        catch 
        {
            MessageBox.Show("Failed to read the file");
        }
    }
}

如果我手动输入数据，一切正常。

Answer 1

您也可以使用clone function试试此

private void button1_Click(object sender, EventArgs e)
{
    DataTable dat = (DataTable)dGV.DataSource;
    DataTable dt = new DataTable();
    dt = dat.Clone();
    dGV.DataSource = dt;
}

或

    DataTable dt = (DataTable)dGV.DataSource;
    dGV.DataSource = dt;

DataTable.Copy（）没有复制第一行

1 个答案: