How to pass empty value to list

Ramco Ramco

How i should pass value to List Students so that it should return all students

public List GetSessionDeliveryParticipantList(DateTime frDate, DateTime toDate, List Student, )
{
    List Result = (from t in context.View_SessionDeliveryParticipant_Detailed_Reports
                                                                    where t.SessionDate.Value.Date >= frDate.Date && t.SessionDate.Value.Date <= toDate.Date
                                                                    && (Student.Count != 0 ? Student.Contains(t.StudentID.ToString()) : 1 == 1)
                                                                    
                                                                    orderby t.SessionDate ascending
                                                                    select t).ToList();
    return Result;
}

Thanks

3 Replies

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Jignesh Kumar3y ago

Accepted answer

Hello Ramco,

Please try this one,

public List GetSessionDeliveryParticipantList(DateTime frDate, DateTime toDate, List studentsIds)
{
    List Result = (from t in context.View_SessionDeliveryParticipant_Detailed_Reports
                                                                    where t.SessionDate.Value.Date >= frDate.Date && t.SessionDate.Value.Date <= toDate.Date
                                                                    && studentsIds.Contains(t.StudentID.ToString()))
                                                                    
                                                                    orderby t.SessionDate ascending
                                                                    select t).ToList();
    return Result;
}

while calling this method you need to pass empty list of string

var studentsIds = new List();
// Add all students whose records you want using Add()
// studentsIds.Add("1");
// studentsIds.Add("2");

// Call above method using below call

var frDate = FromDate;
var toDate = ToDate ;

var result = GetSessionDeliveryParticipantList(frDate,toDate,studentsIds);

Tuhin Paul3y ago

public List GetSessionDeliveryParticipantList(DateTime frDate, DateTime toDate, List studentsIds)
{
    if (frDate == null || toDate == null || studentsIds == null || !studentsIds.Any())
    {
        throw new ArgumentException("Invalid input parameters.");
    }
    
    List result = (from t in context.View_SessionDeliveryParticipant_Detailed_Reports
                                                                    where t.SessionDate.Value.Date >= frDate.Date 
                                                                    && t.SessionDate.Value.Date <= toDate.Date
                                                                    && studentsIds.Contains(t.StudentID.ToString())
                                                                    orderby t.SessionDate ascending
                                                                    select t).ToList();
    
    return result;
}

In this modified version of the code, I've added parameter validation in the form of an ArgumentException if any of the input parameters are null or empty. I've also changed the variable name Result to result to follow C# naming conventions, and added consistent indentation and spacing.

Rajkiran Swain3y ago

List allStudents = new List();

List result = GetSessionDeliveryParticipantList(frDate, toDate, allStudents);