我正在尝试在MVC4中查询数据库，执行计算并在图表中显示

Question

我在找到这个问题的答案时遇到了一些困难。我正在尝试查询通过MVC4创建的现有数据库是用于创建它的代码。我希望能够对数据进行计算，并用第二个代码块中的虹吸数据替换条形图数组。感谢。

public class GradeBook
{
    public int ID { get; set; }
    public string CourseNo { get; set; }
    public string Course { get; set; }
    public string StudentID { get; set; }
    public string StudentName { get; set; }
    public string AssignType { get; set; }
    public int Grade { get; set; }
    public DateTime Date { get; set; }
}

public class GradeBookDBContext : DbContext
{
    public DbSet<GradeBook> GradeBooks { get; set; }

}

<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript">
    google.load("visualization", "1", { packages: ["corechart"] });
    google.setOnLoadCallback(drawChart);
    function drawChart() {
        var data = google.visualization.arrayToDataTable([
          ['Grade', 'Midterm', 'Final'],
          ['<50', 1000, 400],
          ['60-69', 1000, 400],
          ['70-79', 1170, 460],
          ['80-89', 660, 1120],
          ['90-100', 1030, 540]
        ]);