将数据从Excel导入Visual Studio dataGridView。获取此错误对象引用未设置为对象的实例

Question

我正在从这个Link将excel数据导入dataGridView。但我收到错误“对象引用未设置为对象的实例”。

        String name = "Sheet1";
        String constr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" +
                        file +
                        ";Extended Properties='Excel 8.0;HDR=YES;';";

        OleDbConnection con = new OleDbConnection(constr);
        OleDbCommand oconn = new OleDbCommand("Select * From [" + name + "$]", con);
        con.Open();

        OleDbDataAdapter sda = new OleDbDataAdapter(oconn);
        System.Data.DataTable data = new System.Data.DataTable();
        sda.Fill(data);
        dgvIM.DataSource = data;

Answer 1

调试时检查dgvIM的值。它可能是空的;