Task <DataTable>不包含“行”的定义

Question

我有这段代码从数据库中获取数据

public async Task<DataTable> SelectData(string stored_procedure, SqlParameter[] param)
    {
        SqlCommand sqlcmd = new SqlCommand();
        sqlcmd.CommandType = CommandType.StoredProcedure;
        sqlcmd.CommandText = stored_procedure;
        sqlcmd.Connection = sqlconnection;
        if (param != null)
        {
            sqlcmd.Parameters.AddRange(param);
        }

        SqlDataAdapter da = new SqlDataAdapter(sqlcmd);
        DataTable dt = new DataTable();
        await Task.Run(()=> da.Fill(dt));
        return dt;
    }

我用这段代码运行存储过程

public async Task<DataTable> GetOrderManagementManagerEmail()
    {
        DAL.DataAccessLayer DAL = new DAL.DataAccessLayer();
        DataTable dt = new DataTable();
        dt =await DAL.SelectData("GetOrderManagementManagerEmail", null);
        DAL.Close();
        return dt;
    }

然后我在单击按钮时使用此代码

private async void btnValidate_Click(object sender, EventArgs e)
    {
        int[] selectedRows = gridView2.GetSelectedRows();
        for (int i = 0; i < selectedRows.Length; i++)
        {
            DataRow rowGridView2 = (gridView2.GetRow(selectedRows[i]) as DataRowView).Row;
          await  stock.ValidateProjectNeed(Convert.ToInt32(rowGridView2["id"]), DateTime.Now);
        }
        if (XtraMessageBox.Show(Resources.addedSuccessfullyBonBesoinAndSendEmail, Resources.Validate, MessageBoxButtons.YesNo, MessageBoxIcon.Information) == DialogResult.Yes)
        {


            Microsoft.Office.Interop.Outlook.Application oApp = new Microsoft.Office.Interop.Outlook.Application();
            Microsoft.Office.Interop.Outlook.MailItem oMsg = (Microsoft.Office.Interop.Outlook.MailItem)oApp.CreateItem(Microsoft.Office.Interop.Outlook.OlItemType.olMailItem);
            Recipients oRecips = oMsg.Recipients;

            oMsg.To =await Task.Run(()=> stock.GetOrderManagementManagerEmail().Rows[0][0].ToString());
            oMsg.Subject = "Bon Besoin " ;
            oMsg.BodyFormat = Microsoft.Office.Interop.Outlook.OlBodyFormat.olFormatHTML;
            oMsg.Display(false); //In order to display it in modal inspector change the argument to true
            oMsg.HTMLBody = "Un nouveau bon besoin a été ajouté " +
                "<br />" +  oMsg.HTMLBody; //Here comes your body;

        }
        gridControl2.DataSource = stock.GetProjectNeedsForValidate();
    }

但是我在这行代码中遇到错误

oMsg.To =await Task.Run(()=> stock.GetOrderManagementManagerEmail().Rows[0][0].ToString());

Task不包含“行”的定义，并且找不到包含可接受的“任务”类型的第一个参数的可访问扩展方法“行”（您是否缺少using指令或程序集引用？）。在使用异步之前，代码可以正常工作。谢谢。

Answer 1

你要：

var table = await stock.GetOrderManagementManagerEmail();
oMsg.To = table.Rows[0][0].ToString();

不确定发生了什么await Task.Run()。您正在Task从调用返回GetOrderManagementManagerEmail()，然后尝试从任务中检索行，并用。

简化它。另外，看看是否真的需要将表/行与索引器一起使用。您可以使用：

var oMsg.To = table.AsEnumerable().Select(d => d.Field<string>("To")).FirstOrDefault();