我是非常新的C#和MVC和我創建一個Web應用程序。我正在嘗試使用DotNet High Chart創建一個線圖,該線圖將使用我的數據庫中的數據填充。我有問題將日期時間轉換爲字符串。我的圖表控制器:系統不支持轉換日期時間 - DotNetHighChart
var dataLeft = (from d in db.Appointments
select new
{
Date = d.Date.ToString("yyyyMMdd"),
IOPLeft = d.IOPLeft,
}).ToList();
var xSeries = dataLeft.Select(a => a.Date).ToArray();
var ySeries = dataLeft.Select(a => a.IOPLeft).ToArray();
// instantiate an object of the high charts type
var chart = new Highcharts("chart")
// define the type of chart
.InitChart(new Chart { DefaultSeriesType = ChartTypes.Line })
//overall title of the chart
.SetTitle(new Title { Text = "Left IOP" })
//small label below the main title
.SetSubtitle(new Subtitle { Text = "LeftIOP" })
// load the x values
.SetXAxis(new XAxis { Categories = xSeries })
// set the y title
.SetYAxis(new YAxis { Title = new YAxisTitle { Text = "IOP" } })
.SetTooltip(new Tooltip
{
Enabled = true,
Formatter = @"function() { return '<b>'+this.series.name +'</b><br/>'+this.x+': '+this.y;}"
})
.SetPlotOptions(new PlotOptions
{
Line = new PlotOptionsLine
{
DataLabels = new PlotOptionsLineDataLabels
{
Enabled = true
},
EnableMouseTracking = false
}
})
//load y values
.SetSeries(new[]
{
new Series {Name = "Patient",
Data = new Data(new object[] {ySeries})},
});
return View(chart);
}
}
}
我的模型:
[Display(Name = "Date")]
[DataType(DataType.Date)]
[DisplayFormat(ApplyFormatInEditMode = true, DataFormatString = "{0:dd/MM/yyyy}")]
public DateTime Date { get; set; }
[Display(Name = "Left IOP")]
public int IOPLeft { get; set; }
當我嘗試運行我收到以下錯誤應用程序:
An exception of type 'System.NotSupportedException' occurred in EntityFramework.SqlServer.dll but was not handled in user code
Additional information: LINQ to Entities does not recognize the method 'System.String ToString(System.String)' method, and this method cannot be translated into a store expression.
任何HEP將不勝感激 謝謝
這一工程!謝謝@Dmeel – coto2