protected void SubmitGrades_Click(object sender, EventArgs e)
{
// Take the form's data and send it to the BLL for processing
// The .TryRun will process the anonymous method inside a try block & report any errors.
MessageUserControl.TryRun(() =>
{
// 1) Gather form data
var course = CourseDropDown.SelectedValue;
var assignment = AssignmentDropDown.SelectedValue;
var studentGrades = new List <AssignedGrade>();
// 1.a) Get the data from the ListView
int possible;
if (!int.TryParse(PossibleMarks.Text, out possible))
{
throw new Exception("You must enter a number for possible marks.");
}
foreach (ListViewDataItem item in StudentMarkListView.Items)
{
// Get a reference to the controls in the <ItemTemplate> that hold the data
var markTextBox = item.FindControl("EarnedMarksTextBox") as TextBox;
var idLabel = item.FindControl("StudentIDLabel") as Label;
// Don't assume! Check that the controls were actually found before using them
if (markTextBox != null && idLabel != null)
{
double mark;
int id;
if (!double.TryParse(markTextBox.Text, out mark))
{
throw new Exception("You can only enter numbers for the student grade");
}
if (!int.TryParse(idLabel.Text, out id))
{
throw new Exception("Stop hacking the code-behind on the form");
}
var grade = new AssignedGrade
{
EarnedMarks = mark,
StudentID = id,
PossibleMarks = possible
};
studentGrades.Add(grade);
}
else
{
throw new Exception("Programmer, check your code!");
}
}
// 2) Send to BLL
var controller = new StudentGradesController();
controller.ProcessMarks(course, assignment, studentGrades);
}, "Grades Processed", "Grades were sent. Beyond that, I don't know what they did with them");
}
// Final processing for this page to add courses to our system.
protected void AddCourse_Click(object sender, EventArgs e)
{
MessageUserControl.TryRun(() =>
{
// 1) Extract the data from the form
DateTime start;
DateTime.TryParse(StartsOn.Text, out start);
var courseInfo = new CourseOffering(CourseName.Text, start);
RetrieveAssignments();
// 2) Send the data to the BLL for processing
var controller = new StudentGradesController();
controller.CreateCourse(courseInfo, 7, Assignments);
Courses.DataBind();
}, "Course Added", $"Successfully added the {CourseName.Text} course");
}
protected void CourseDropDownList_SelectedIndexChanged(object sender, EventArgs e)
{
// Take the info from this drop-down and use it to get data for the next drop-down
if (CourseDropDownList.SelectedIndex > 0)
{
var controller = new StudentGradesController();
AssignmentDropDownList.DataSource = controller.ListAssignments(CourseDropDownList.SelectedValue);
AssignmentDropDownList.DataTextField = nameof(AssignmentInfo.Description);
AssignmentDropDownList.DataValueField = nameof(AssignmentInfo.Name);
AssignmentDropDownList.DataBind();
AssignmentDropDownList.Items.Insert(0, "[Select an assignment]");
}
else
{
// Clear out my second drop-down
AssignmentDropDownList.Items.Clear();
}
}
protected void Courses_SelectedIndexChanged(object sender, EventArgs e)
{
// our chance to do something AFTER the change takes place
GridViewEventInfo.Text += $"Changed Event - {Courses.SelectedDataKey.Value}<br />";
GridViewEventInfo.Text += "<ul>";
foreach (var item in Courses.SelectedDataKey.Values.Values)
{
GridViewEventInfo.Text += $"<li>{item}</li>";
}
GridViewEventInfo.Text += "</ul>";
// Our actual processing of getting the students based on our "data key" values
string courseName = Courses.SelectedDataKey[nameof(CourseSummary.CourseName)].ToString();
string startingDate = Courses.SelectedDataKey[nameof(CourseSummary.StartDate)].ToString();
// $"" is called String Interpolation
GridViewEventInfo.Text += $"-{courseName}-{startingDate}-";
var controller = new StudentGradesController();
var classListData = controller.ListStudentsInClass(courseName, DateTime.Parse(startingDate));
ClassListRepeater.DataSource = classListData;
ClassListRepeater.DataBind();
}
