Question

我以前使用以下代码对GridView中某一列的总数求和，并将其用作分钟数：

int total = 0;
    protected void GridView1_RowDataBound1(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            total += Convert.ToInt32(DataBinder.Eval(e.Row.DataItem, "Amount"));
        }
    }

列数据只是数字，例如：

但是现在为该列检索的数据为nvarchar（hh：mm），并希望将其求和为例如

成为：

04:20

Answer 1

您可以使用TimeSpan.FromMinutes（minutesInDouble），以双精度格式传递上述值。

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Answer 2

您可以尝试以下操作：

static void Main(string[] args)
{
    string hours = @"
    01:30
    00:45
    00:05
    02:00";

    TimeSpan totalHoursSpan = hours.Split(new [] { Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries)
         .Select(x => DateTime.ParseExact(x.Trim(), "HH:mm", CultureInfo.InvariantCulture).TimeOfDay)
         .Aggregate(TimeSpan.Zero, (total, span) => total += span);


    string totalHrs = string.Format("{0:00}:{1:00}", (int)totalHoursSpan.TotalHours, totalHoursSpan.Minutes);

    Console.WriteLine(totalHrs);

}

输出：

04:20

Answer 3

您可以使用System.TimeSpan以“时间”格式获取结果

TimeSpan total = new TimeSpan();

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {

        var ts = DataBinder.Eval(e.Row.DataItem, "Amount").ToString(); 
        var t = DateTime.Parse(ts).TimeOfDay;
        totalTime += t;
    }

Answer 4

string totalTime;
TimeSpan ts = new TimeSpan();
protected void GridView1_RowDataBound1(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        ts = ts.Add(TimeSpan.Parse((DataBinder.Eval(e.Row.DataItem, "Amount")));
        var hourPart = ((int)(Math.Truncate(ts.TotalMinutes/60))).ToString().PadLeft(2,'0');
        var minutePart = (ts.TotalMinutes%60).ToString().PadLeft(2,'0');
        totalTime = hourPart+":"+minutePart;
    }
}

如何从gridview计算时间hh：mm

4 个答案: