Question

我使用Array ( [0] => stdClass Object ( [title] => Browser Name [name] => browser [posted] => Array ( [0] => Firefox [1] => Chrome ) ) [1] => stdClass Object ( [title] => First Name [name] => firstname [posted] => John ) [2] => stdClass Object ( [title] => Last Name [name] => lastname [posted] => Doe ) )获得了for循环，我尝试通过对数据求和来向图表添加点数;但是，在运行循环时我收到此错误：

InvalidCastException未处理：来自＆＃39; DateTime＆＃39;的无效广播至＆＃39;的Int32＆＃39;

以下是我正在尝试的for循环中的代码：

DateTime

Answer 1

你实际上并不需要DateTime，而应该做的是循环int，如下所示：

const int intervalMinutes = 15;
const int numIntervals = 24 * (60/intervalMinutes);
for(int i = 0; i < numIntervals; ++i)
{
    double sum = 0d;

    //for every series in the chart collection sum the yvalues at the specified 
    foreach (Series s in dataSeries)
    {
        sum += s.Points[i].YValues[0];
    }
    DataPoint dp = new DataPoint();
    //Add a new yvalue to the datapoint for the summed series's

    //And I will get an error in this one as well
    dp.XValue = dataSeries[0].Points[i].XValue;

    dp.YValues[0] = sum;
    sumSeries.Points.Add(dp);
}

如果你的循环内部确实需要DateTime，请按以下方式创建：

DateTime dateTime = new DateTime().AddMinutes(intervalMinutes * i);

如何将DateTime转换为Int，它正在读取＆＃39; DateTime＆＃39;的无效转换。到＆＃39; Int32＆＃39;？

1 个答案: