Question

我不知道如何处理我得到的错误：＆＃34;无法从对象转换为字符串＆＃34;

row["timeinseconds"] = TimeSpan.FromSeconds( double.Parse( r["timeinseconds"] ) ).ToString(@"hh\:mm\:ss");

timeinseconds来自sqlite数据库，并存储为整数值

我需要将其解析为double，以便我可以使用timepan的from seconds方法，以便将其转换为正确的格式

private void updateDgvTimesheet()
{
    dgvTimesheet.Rows.Clear();

    foreach (DataRow r in dataset.Tables[0].Rows)
    {
        DataRow row = this.dataset.Tables[0].NewRow();

        row["taskname"] = r["taskname"];

        row["timeinseconds"] = TimeSpan.FromSeconds( double.Parse( r["timeinseconds"] ) ).ToString(@"hh\:mm\:ss");
        row["date"] = r["date"];
        row["paid"] = r["paid"];

        dgvTimesheet.Rows.Add(row);
    }
}

Answer 1

您必须转换r["timeinseconds"].ToString()

将您的功能更改为：

private void updateDgvTimesheet()
{
    dgvTimesheet.Rows.Clear();

    foreach (DataRow r in dataset.Tables[0].Rows)
    {
        DataRow row = this.dataset.Tables[0].NewRow();

        row["taskname"] = r["taskname"];

        row["timeinseconds"] = TimeSpan.FromSeconds( double.Parse( r["timeinseconds"].ToString() ) ).ToString(@"hh\:mm\:ss");
        row["date"] = r["date"];
        row["paid"] = r["paid"];

        dgvTimesheet.Rows.Add(row);
    }
}

无法在C＃中从对象转换为字符串

1 个答案: