static void Main(string[] args)
{
Student1 std = null;
try
{
try
{
std.StudentName = "";
}
catch
{
Console.WriteLine("Inner catch");
}
}
catch
{
Console.WriteLine("Outer catch");
}
}
static void Main1()
{
//Here we Subjects property in the Student1 class whichis a collection of strings.
//Use of Select :
IEnumerable <List <string> > Subjects1 = Student1.GetAllStudents().Select(stu => stu.Subjects);
foreach (List <string> subjects in Subjects1)
{
foreach (string subject in subjects)
{
Console.WriteLine(subject);
}
}
//Use Of Select Many :
IEnumerable <string> Subjects2 = Student1.GetAllStudents().SelectMany(stu => stu.Subjects);
foreach (string subject in Subjects2)
{
Console.WriteLine(subject);
}
}
//SelectMany Operator belong to Projection Operators category. It is used to project each element of a sequence to an IEnumerable<T> and flattens the resulting sequences into one sequence.
static void Main1()
{
//Return all the Subject List------------------------------------------------------------------------------------------------------------------------------------------------------------------
IEnumerable <string> Subjects10 = Student1.GetAllStudents().SelectMany(stu => stu.Subjects); //This will return all the subjects of all the students repeatidly
IEnumerable <string> Subjects11 = Student1.GetAllStudents().SelectMany(stu => stu.Subjects).Distinct();
foreach (string subject in Subjects11)
{
//Console.WriteLine(subject);
}
//Return all the Subjects by using a SQl Query Like Patteren-------------------------------------------------------------------------------------------------------------------------------------
IEnumerable <string> Subjects20 = from student in Student1.GetAllStudents()
from subject in student.Subjects
select subject; //This will return all the subjects of all the students repeatidly
IEnumerable <string> Subjects21 = (from student in Student1.GetAllStudents()
from subject in student.Subjects
select subject).Distinct(); //This will return all the subjects of all the students repeatidly
foreach (string subject in Subjects21)
{
//Console.WriteLine(subject);
}
//How we write all the Subjects- Student Name Side by side by using Linq Query----------------------------------------------------------------------------------------------------------------------
var result30 = Student1.GetAllStudents().SelectMany(stu => stu.Subjects, (student, subject) => new
{
StudentName = student.Name,
SubjectName = subject
});
foreach (var v in result30)
{
Console.WriteLine("{0} - {1} ", v.StudentName, v.SubjectName);
}
Console.WriteLine(result30.Count());
//How we write all the Subjects- Student Name Side by side by using Sql Like Query--------------------------------------------------------------------------------------------------------------------
var result31 = from student in Student1.GetAllStudents()
from subject in student.Subjects
select new { SubjectName = student.Name, StudentName = subject };
foreach (var v in result31)
{
//Console.WriteLine("{0} - {1} ", v.StudentName, v.SubjectName);
}
// Console.WriteLine(result31.Count());
//Write the Alphabet Series and the Numbers in the String Array---------------------------------------------------------------------------------------------------------------------------------------
String[] stringArray =
{
"ABCDEFGHIJKLMNOPQRSTUVWXYZ",
"0123456789"
};
IEnumerable <char> result1 = stringArray.SelectMany(s => s);
foreach (char c in result1)
{
//Console.WriteLine(c);
}
//we can also rewrite the above result by using Sql Like Patteren-------------------------------------------------------------------------------------------------------------------------------------
IEnumerable <char> result2 = from chs in stringArray
from ch in chs
select ch;
foreach (char ch in result2)
{
//Console.WriteLine(ch);
}
}