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Form2.cs
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Form2.cs
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace MyApp
{
public partial class Form2 : Form
{
public Form2()
{
InitializeComponent();
}
DbSinavOgrenciEntities dbSinavOgrenciEntities = new DbSinavOgrenciEntities();
private void btnGetByLinq_Click(object sender, EventArgs e)
{
if (radioButtonGetSmallerGrades.Checked == true)
{
var query = dbSinavOgrenciEntities.TBLNOTLAR.Where(x => x.Sinav1 < 50);
dataGridView1.DataSource = query.ToList();
}
if (radioButtonGetByName.Checked == true)
{
var query = dbSinavOgrenciEntities.TBLOGRENCI.Where(x => x.Ad == "Ferit");
dataGridView1.DataSource = query.ToList();
}
// LinQ Get Data by Name and Surname from TextBox, added with contains search
if (radioButtonGetByTextBox.Checked == true)
{
var text = textBoxGetByNameOrSurname.Text;
var query = dbSinavOgrenciEntities.TBLOGRENCI.Where(
x => x.Ad == text ||
x.Soyad == text ||
x.Ad.Contains(text) ||
x.Soyad.Contains(text)
);
dataGridView1.DataSource = query.ToList();
}
// LinQ Select restriction with one anonymous type
if (radioButtonGetBySurname.Checked == true)
{
var query = dbSinavOgrenciEntities.TBLOGRENCI.Select(q => new { SurName = q.Soyad });
dataGridView1.DataSource = query.ToList();
}
// LinQ Select restriction with two anonymous type
if (radioButtonGetByBiggerNameSmallSurname.Checked == true)
{
var query = dbSinavOgrenciEntities.TBLOGRENCI.Select(x => new { Name = x.Ad.ToUpper(), SurName = x.Soyad.ToLower() });
//var query = dbSinavOgrenciEntities.TBLOGRENCI.Select(x => new { Name = x.Ad.ToUpper() + " " + x.Soyad.ToLower() });
dataGridView1.DataSource = query.ToList();
}
// LinQ Conditional Select with two anonymous type
if (radioButtonConditionalSelect.Checked == true)
{
var query = dbSinavOgrenciEntities.TBLOGRENCI.Select(p => new
{
Name = p.Ad.ToUpper(),
SurName = p.Soyad.ToLower()
}).Where(x => x.Name == "Ferit");
dataGridView1.DataSource = query.ToList();
}
// LinQ Conditional Select with two anonymous type and one anonymous type with extra pass/fail condition
if (radioButtonPassOrFail.Checked == true)
{
var query = dbSinavOgrenciEntities.TBLNOTLAR.Select(x => new
{
StudentID = x.OgrID,
Average = x.Ortalama,
PassOrFail = x.Durum == true ? "Geçti" : "Kaldı"
});
dataGridView1.DataSource = query.ToList();
}
// LinQ SelectMany Projection Usage with two tables
if (radioButtonJoin.Checked == true)
{
var query = dbSinavOgrenciEntities.TBLNOTLAR.SelectMany(
x=> dbSinavOgrenciEntities.TBLOGRENCI.Where(
y=> y.ID == x.OgrID),
(x,y)=>
new
{
Name = y.Ad,
Surname = y.Soyad,
Average = x.Ortalama,
PassOrFail = x.Durum == true ? "Geçti" : "Kaldı"
});
dataGridView1.DataSource = query.ToList();
}
// LinQ Take First 3 Rows.
if (radioButtonGetFirstThree.Checked == true)
{
var query = dbSinavOgrenciEntities.TBLOGRENCI.OrderBy(x=> x.ID).Take(3);
dataGridView1.DataSource = query.ToList();
}
// LinQ Take Last 3 Rows.
if (radioButtonGetLastThree.Checked == true)
{
var query = dbSinavOgrenciEntities.TBLOGRENCI.OrderByDescending(x=> x.ID).Take(3);
dataGridView1.DataSource = query.ToList();
}
// LinQ Order By ID and Skip First Five Rows
if (radioButtonSkipFirstFive.Checked == true)
{
var query = dbSinavOgrenciEntities.TBLOGRENCI.OrderBy(x=> x.ID).Skip(5);
dataGridView1.DataSource = query.ToList();
}
// LinQ Order By Name
if (radioButtonOrderByName.Checked == true)
{
var query = dbSinavOgrenciEntities.TBLOGRENCI.OrderBy(x => x.Ad);
dataGridView1.DataSource = query.ToList();
}
}
}
}