无法在 C# 中从对象转换为字符串
cannot convert from object to string in C#
我不确定如何处理我遇到的这个错误:
"cannot convert from object to string"
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
我需要将它解析为 double,这样我就可以使用时间跨度的 from seconds 方法,这样我就可以将它转换为正确的格式
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);
}
}
你必须转换r["timeinseconds"].ToString()
将您的函数更改为:
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);
}
}
我不确定如何处理我遇到的这个错误: "cannot convert from object to string"
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
我需要将它解析为 double,这样我就可以使用时间跨度的 from seconds 方法,这样我就可以将它转换为正确的格式
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);
}
}
你必须转换r["timeinseconds"].ToString()
将您的函数更改为:
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);
}
}