Working With linq and Entity Framework plus excel reports|Enjoy
public static string strMessage = "";
public SchoolEntities dbContext;
public string login(string strUsername, string strPassword)
{
dbContext = new SchoolEntities();
var linqQuery = from User in dbContext.People
where User.FirstName == strUsername && User.LastName == strPassword
select User;
if (linqQuery.Count() == 1)
{
strMessage = "Good";
}
else
{
strMessage = "Bad";
}
return strMessage;
}
public Object LoadPersonDetails()
{
dbContext = new SchoolEntities();
//DataTable dtPerson = new DataTable();
var linqQuery = from users in dbContext.People
select users;
//List<Person> Users = linqQuery.ToList();
//dtPerson = linqQuery.ToList();
return linqQuery;
}
public void InsertPerson(string strLName, string strFName, string strHireDate, string EnrollmentDate)
{
dbContext = new SchoolEntities();
Person NewPerson = dbContext.People.Create();
NewPerson.LastName = strLName;
NewPerson.FirstName = strFName;
NewPerson.HireDate = Convert.ToDateTime(strHireDate);
NewPerson.EnrollmentDate = Convert.ToDateTime(EnrollmentDate);
dbContext.People.Add(NewPerson);
dbContext.SaveChanges();
}
public void DeleteUser(int intPersonID)
{
//dbContext = new SchoolEntities();
using (dbContext = new SchoolEntities())
{
Person Person = dbContext.People.Where(c => c.PersonID == intPersonID).FirstOrDefault();
if (Person != null)
{
dbContext.People.Remove(Person);
dbContext.SaveChanges();
}
}
}
public void ModifyPerson(int intPersonID, string strLName, string strFName, string strHireDate, string EnrollmentDate)
{
var UpdatePerson = dbContext.People.FirstOrDefault(s => s.PersonID == intPersonID);
UpdatePerson.LastName = strLName;
UpdatePerson.FirstName = strFName;
UpdatePerson.HireDate = Convert.ToDateTime(strHireDate);
UpdatePerson.EnrollmentDate = Convert.ToDateTime(EnrollmentDate);
dbContext.SaveChanges();
}
private Excel.Application XApp = null; //Creates the Excel Document
private Excel.Workbook XWorkbook = null; //create the workbook in the recently created document
private Excel.Worksheet XWorksheet = null; //allows us to work with current worksheet
private Excel.Range XWorkSheet_range = null; // allows us to modify cells on the sheet
public void Reports()
{
dbContext = new SchoolEntities();
var linqQuery = (from users in dbContext.StudentGrades
group users by new { users.EnrollmentID, users.CourseID, users.StudentID, users.Grade }
into UserGroup
orderby UserGroup.Key.CourseID ascending
select new { UserGroup.Key.EnrollmentID, UserGroup.Key.CourseID, UserGroup.Key.StudentID, UserGroup.Key.Grade }).ToList();
var RatingAverage = dbContext.StudentGrades.Average(r => r.Grade);
var GradeSum = dbContext.StudentGrades.Sum(r => r.Grade);
/*var linqQuery = (from users in dbContext.StudentGrades
orderby users.CourseID descending
select users).ToList();*/
//Array Motho = linqQuery.ToArray();
XApp = new Excel.Application();
XApp.Visible = true;
XWorkbook = XApp.Workbooks.Add(1);
XWorksheet = (Excel.Worksheet)XWorkbook.Sheets[1];
//Create column headers
XWorksheet.Cells[2, 1] = "EnrollmentID";
XWorksheet.Cells[2, 2] = "CourseID";
XWorksheet.Cells[2, 3] = "StudentID";
XWorksheet.Cells[2, 4] = "Grade";
//XWorksheet.Cells[2, 5] = "Enrollment Date";
int row = 3;
foreach (var Mothos in linqQuery)
{
XWorksheet.Cells[row, 1] = Mothos.EnrollmentID.ToString();
XWorksheet.Cells[row, 2] = Mothos.CourseID.ToString();
XWorksheet.Cells[row, 3] = Mothos.StudentID.ToString();
XWorksheet.Cells[row, 4] = Mothos.Grade.ToString();
row++;
}
int rows = linqQuery.Count();
XWorksheet.Cells[rows + 4, 3] = "Grades Average";
XWorksheet.Cells[rows + 4, 4] = RatingAverage.Value.ToString();
XWorksheet.Cells[rows + 5, 3] = "Grades Sum";
XWorksheet.Cells[rows + 5, 4] = GradeSum.Value.ToString();
//XWorkSheet_range.ColumnWidth = 30;
//XWorksheet.Cells.AutoFit();
}
