如何解决将int转换为List <double?>,ChartJS Core
我正在开发Web应用程序。我发现这个有趣的https://github.com/mattosaurus/ChartJSCore。在我的应用程序中使用图表。
大多数页面上的图表都可以正常工作。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 },//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,如何实现适当的Line变量的“显式转换”(int)。
请注意,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
我尝试了很多铸造解决方案,但没有一个适合我,例如:
-
(List
)结果.Select(x => x。适当); -
私有静态图表GenerateLineChart((List
)AppropriateLine) -
我已经了解了“全部转换”方法,但是没有用。
非常感谢您的帮助,
谢谢。
解决方法
也许您可以在当前需要列表时检查数字是否为double或int bool isInt = d == (int)d;
并进行解析以仅在aux上使用该时间。
根据您提到的内容,似乎传递给GenerateLineChart
的数据仅用于UI。也就是说,此方法可以获得原始数据的适当副本。如果是这样,那么您尝试的解决方案
(List<double?>)result.Select(x => x.Appropriate)
非常接近,但是转换需要在Select
内部完成,即
result.Select(x => (double?)x.Appropriate)
这是您所做的代码更改的简图
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
}
// ....
}
版权声明:本文内容由互联网用户自发贡献,该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 dio@foxmail.com 举报,一经查实,本站将立刻删除。