我正在开发Web应用程序。我发现了这个有趣的https://github.com/mattosaurus/ChartJSCore。在我的应用程序中使用图表。
图表在大多数页面中均能成功运行。但是在一页中,我有以下想法:
我的模型中有3个属性(适当,不适当,NoInteraction),所有属性均为(int)类型,我需要将其保留为整数以操纵应用程序中的其他功能。每个属性在图表中将以一个系列表示,并且应始终为15个整数的列表或数组。
这是我在会话模型中的属性:
public int DayNumber { get; set; }
public int Appropriate { get; set; }
public int NotAppropriate { get; set; }
public int NoInteraction { get; set; }
这是我的控制器:
public IActionResult Details()
{
var result = _db.Session.ToList();
//I want this appropriateLine to be passed to GenerateLineChart method but whenever i tried i came up with an error of converting types.
var AppropriateLine = result.Select(x => x.Appropriate).ToList();
Chart lineChart = GenerateLineChart();
ViewData["LineChart"] = lineChart;
return View();
}
private static Chart GenerateLineChart()
{
Chart chart = new Chart();
chart.Type = Enums.ChartType.Line;
ChartJSCore.Models.Data data = new ChartJSCore.Models.Data();
data.Labels = new List<string>() { "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15" };
LineDataset AppropriateDataset = new LineDataset()
{
Label = "Appropriate Data Line",
Data = new List<double?>() { 2, 6, 2, 6, 2, 6 }, //Here i want this to be filled with data from AppropriateLine variable, it works for the fixed value only
Fill = "false",
LineTension = 0.1,
BackgroundColor = ChartColor.FromHexString("#FF6384"),
BorderColor = ChartColor.FromHexString("#FF6384"),
BorderCapStyle = "butt",
BorderDash = new List<int> { },
BorderDashOffset = 0.0,
BorderJoinStyle = "miter",
PointBorderColor = new List<ChartColor>() { ChartColor.FromHexString("#FF6384"), },
PointBackgroundColor = new List<ChartColor>() { ChartColor.FromHexString("#fff") },
PointBorderWidth = new List<int> { 1 },
PointHoverRadius = new List<int> { 5 },
PointHoverBackgroundColor = new List<ChartColor>() { ChartColor.FromHexString("#FF6384"), },
PointHoverBorderColor = new List<ChartColor>() { ChartColor.FromHexString("#FF6384"), },
PointHoverBorderWidth = new List<int> { 2 },
PointRadius = new List<int> { 1 },
PointHitRadius = new List<int> { 10 },
SpanGaps = false
};
data.Datasets = new List<Dataset>();
data.Datasets.Add(AppropriateDataset);
Options options = new Options()
{
Scales = new Scales()
};
Scales scales = new Scales()
{
YAxes = new List<Scale>()
{
new CartesianScale()
}
};
CartesianScale yAxes = new CartesianScale()
{
Ticks = new Tick()
};
Tick tick = new Tick()
{
Callback = "function(value, index, values) {return '' + value;}"
};
yAxes.Ticks = tick;
scales.YAxes = new List<Scale>() { yAxes };
options.Scales = scales;
chart.Options = options;
chart.Data = data;
return chart;
}
在将其传递给GenerateLineChart()之前,如何实现propertyLine变量的“显式转换”(int)。
注意,我不想更改Model属性类型,因为许多功能都依赖于它。另外,我无法从List <double?>更改数据类型,因为通过添加它可以解决许多其他问题。
我尝试了许多铸造解决方案,但没有一个适合我,例如:
(List <double?>)result.Select(x => x。适当);
私人静态图表GenerateLineChart((List <double?>)AppropriateLine)
我已经读过“全部转换”方法,但是没有用。
任何帮助深表感谢,
提前致谢。
根据您提到的内容,似乎传递给的数据GenerateLineChart
仅用于UI。也就是说,此方法可以获取原始数据的适当副本。如果是这种情况,那么您尝试使用的解决方案
(List<double?>)result.Select(x => x.Appropriate)
距离很近,但是需要在内完成投射Select
,即
result.Select(x => (double?)x.Appropriate)
这是您所做的更改的代码示意图
public IActionResult Details()
{
var result = _db.Session.ToList();
var AppropriateLine = result.Select(x => (double?)x.Appropriate).ToList();
var lineChart = GenerateLineChart(AppropriateLine);
// Rest or your code
}
private static Chart GenerateLineChart(IEnumerable<double?> data)
{
// Your code as is here ....
LineDataset AppropriateDataset = new LineDataset()
{
Data = data,
// Rest of your code
}
// ....
}
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