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Form1.cs
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Form1.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.Windows.Forms;
using DevExpress.Xpo;
using DevExpress.Data.Filtering;
using System.Collections;
using DevExpress.XtraEditors;
using DevExpress.Data.Linq.Helpers;
using DevExpress.XtraEditors.Filtering;
using DevExpress.XtraEditors.Repository;
using DevExpress.Data.Filtering.Helpers;
using DevExpress.Data.Linq;
namespace DXSample
{
public partial class Form1 : XtraForm
{
public Form1()
{
InitializeComponent();
}
IQueryable<Products> source;
private void OnLoad(object sender, EventArgs e)
{
var products = new XPQuery<Products>(unitOfWork1);
source = from product in products
where product.Quantity >= 20
select product;
gridControl1.DataSource = source.ToList();
CreateFilterColumns();
}
private void CreateFilterColumns()
{
filterControl1.FilterColumns.Add(new UnboundFilterColumn("ProductID", "ProductID", typeof(int),
new RepositoryItemSpinEdit(), FilterColumnClauseClass.Generic));
filterControl1.FilterColumns.Add(new UnboundFilterColumn("Quantity", "Quantity", typeof(int),
new RepositoryItemSpinEdit(), FilterColumnClauseClass.Generic));
filterControl1.FilterColumns.Add(new UnboundFilterColumn("Price", "Price", typeof(decimal),
new RepositoryItemSpinEdit(), FilterColumnClauseClass.Generic));
filterControl1.FilterColumns.Add(new UnboundFilterColumn("ProductName", "ProductName", typeof(string),
new RepositoryItemTextEdit(), FilterColumnClauseClass.String));
filterControl1.FilterColumns.Add(new UnboundFilterColumn("Discontinued", "Discontinued", typeof(bool),
new RepositoryItemCheckEdit(), FilterColumnClauseClass.Generic));
}
private void OnUpdateFilter(object sender, EventArgs e)
{
gridControl1.BeginUpdate();
try
{
CriteriaToExpressionConverter converter = new CriteriaToExpressionConverter();
IQueryable<Products> filteredData = source.AppendWhere(converter, filterControl1.FilterCriteria) as IQueryable<Products>;
gridControl1.DataSource = null;
gridControl1.DataSource = filteredData.ToList();
}
finally
{
gridControl1.EndUpdate();
}
}
private void OnSaveButtonClick(object sender, EventArgs e)
{
try
{
unitOfWork1.CommitChanges();
}
catch (Exception exc){
MessageBox.Show(exc.ToString());
unitOfWork1.ReloadChangedObjects();
}
}
}
}