Практическое руководство. Реализация интерфейса IListSource
Реализовать IListSource интерфейс, чтобы создать связываемый класс, который не реализует IList , но вместо этого предоставляет список из другого расположения.
Пример
В следующем примере кода показано, как реализовать IListSource интерфейс. Компонент с именем EmployeeListSource предоставляет IList для привязки данных путем реализации GetList метод.
using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;
namespace IListSourceCS
{
public class EmployeeListSource : Component, IListSource
{
public EmployeeListSource() {}
public EmployeeListSource(IContainer container)
{
container.Add(this);
}
#region IListSource Members
bool IListSource.ContainsListCollection
{
get { return false; }
}
System.Collections.IList IListSource.GetList()
{
BindingList<Employee> ble = new BindingList<Employee>();
if (!this.DesignMode)
{
ble.Add(new Employee("Aaberg, Jesper", 26000000));
ble.Add(new Employee("Cajhen, Janko", 19600000));
ble.Add(new Employee("Furse, Kari", 19000000));
ble.Add(new Employee("Langhorn, Carl", 16000000));
ble.Add(new Employee("Todorov, Teodor", 15700000));
ble.Add(new Employee("Vereb�lyi, �gnes", 15700000));
}
return ble;
}
#endregion
}
}
using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;
namespace IListSourceCS
{
public class Employee : BusinessObjectBase
{
private string _id;
private string _name;
private Decimal parkingId;
public Employee() : this(string.Empty, 0) {}
public Employee(string name) : this(name, 0) {}
public Employee(string name, Decimal parkingId) : base()
{
this._id = System.Guid.NewGuid().ToString();
// Set values
this.Name = name;
this.ParkingID = parkingId;
}
public string ID
{
get { return _id; }
}
const string NAME = "Name";
public string Name
{
get { return _name; }
set
{
if (_name != value)
{
_name = value;
// Raise the PropertyChanged event.
OnPropertyChanged(NAME);
}
}
}
const string PARKING_ID = "Salary";
public Decimal ParkingID
{
get { return parkingId; }
set
{
if (parkingId != value)
{
parkingId = value;
// Raise the PropertyChanged event.
OnPropertyChanged(PARKING_ID);
}
}
}
}
}
using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;
using System.Diagnostics;
namespace IListSourceCS
{
public class BusinessObjectBase : INotifyPropertyChanged
{
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
OnPropertyChanged(new PropertyChangedEventArgs(propertyName));
}
private void OnPropertyChanged(PropertyChangedEventArgs e)
{
if (null != PropertyChanged)
{
PropertyChanged(this, e);
}
}
#endregion
}
}
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace IListSourceCS
{
public class Form1 : Form
{
private System.ComponentModel.IContainer components = null;
private FlowLayoutPanel flowLayoutPanel1;
private Label label2;
private DataGridView dataGridView1;
private DataGridViewTextBoxColumn nameDataGridViewTextBoxColumn;
private DataGridViewTextBoxColumn salaryDataGridViewTextBoxColumn;
private DataGridViewTextBoxColumn iDDataGridViewTextBoxColumn;
private EmployeeListSource employeeListSource1;
public Form1()
{
InitializeComponent();
}
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows Form Designer generated code
private void InitializeComponent()
{
this.components = new System.ComponentModel.Container();
System.Windows.Forms.DataGridViewCellStyle dataGridViewCellStyle1 = new System.Windows.Forms.DataGridViewCellStyle();
System.Windows.Forms.DataGridViewCellStyle dataGridViewCellStyle2 = new System.Windows.Forms.DataGridViewCellStyle();
this.flowLayoutPanel1 = new System.Windows.Forms.FlowLayoutPanel();
this.label2 = new System.Windows.Forms.Label();
this.dataGridView1 = new System.Windows.Forms.DataGridView();
this.nameDataGridViewTextBoxColumn = new System.Windows.Forms.DataGridViewTextBoxColumn();
this.salaryDataGridViewTextBoxColumn = new System.Windows.Forms.DataGridViewTextBoxColumn();
this.iDDataGridViewTextBoxColumn = new System.Windows.Forms.DataGridViewTextBoxColumn();
this.employeeListSource1 = new EmployeeListSource(this.components);
this.flowLayoutPanel1.SuspendLayout();
((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).BeginInit();
this.SuspendLayout();
//
// flowLayoutPanel1
//
this.flowLayoutPanel1.AutoSize = true;
this.flowLayoutPanel1.Controls.Add(this.label2);
this.flowLayoutPanel1.Dock = System.Windows.Forms.DockStyle.Top;
this.flowLayoutPanel1.Location = new System.Drawing.Point(0, 0);
this.flowLayoutPanel1.Name = "flowLayoutPanel1";
this.flowLayoutPanel1.Size = new System.Drawing.Size(416, 51);
this.flowLayoutPanel1.TabIndex = 11;
//
// label2
//
this.label2.AutoSize = true;
this.label2.Location = new System.Drawing.Point(3, 6);
this.label2.Margin = new System.Windows.Forms.Padding(3, 6, 3, 6);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(408, 39);
this.label2.TabIndex = 0;
this.label2.Text = "This sample demonstrates how to implement the IListSource interface. In this sam" +
"ple, a DataGridView is bound at design time to a Component (employeeListSource1)" +
" that implements IListSource.";
//
// dataGridView1
//
this.dataGridView1.AllowUserToAddRows = false;
this.dataGridView1.AllowUserToDeleteRows = false;
dataGridViewCellStyle1.BackColor = System.Drawing.Color.FromArgb(((int)(((byte)(255)))), ((int)(((byte)(255)))), ((int)(((byte)(192)))));
this.dataGridView1.AlternatingRowsDefaultCellStyle = dataGridViewCellStyle1;
this.dataGridView1.AutoGenerateColumns = false;
this.dataGridView1.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
this.dataGridView1.Columns.AddRange(new System.Windows.Forms.DataGridViewColumn[] {
this.nameDataGridViewTextBoxColumn,
this.salaryDataGridViewTextBoxColumn,
this.iDDataGridViewTextBoxColumn});
this.dataGridView1.DataSource = this.employeeListSource1;
this.dataGridView1.Dock = System.Windows.Forms.DockStyle.Fill;
this.dataGridView1.Location = new System.Drawing.Point(0, 51);
this.dataGridView1.Name = "dataGridView1";
this.dataGridView1.RowHeadersVisible = false;
this.dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
this.dataGridView1.Size = new System.Drawing.Size(416, 215);
this.dataGridView1.TabIndex = 12;
//
// nameDataGridViewTextBoxColumn
//
this.nameDataGridViewTextBoxColumn.DataPropertyName = "Name";
this.nameDataGridViewTextBoxColumn.FillWeight = 131.7987F;
this.nameDataGridViewTextBoxColumn.HeaderText = "Name";
this.nameDataGridViewTextBoxColumn.Name = "nameDataGridViewTextBoxColumn";
//
// salaryDataGridViewTextBoxColumn
//
this.salaryDataGridViewTextBoxColumn.DataPropertyName = "ParkingID";
this.salaryDataGridViewTextBoxColumn.DefaultCellStyle = dataGridViewCellStyle2;
this.salaryDataGridViewTextBoxColumn.FillWeight = 121.8274F;
this.salaryDataGridViewTextBoxColumn.HeaderText = "Parking ID";
this.salaryDataGridViewTextBoxColumn.Name = "salaryDataGridViewTextBoxColumn";
//
// iDDataGridViewTextBoxColumn
//
this.iDDataGridViewTextBoxColumn.AutoSizeMode = System.Windows.Forms.DataGridViewAutoSizeColumnMode.Fill;
this.iDDataGridViewTextBoxColumn.DataPropertyName = "ID";
this.iDDataGridViewTextBoxColumn.FillWeight = 46.37391F;
this.iDDataGridViewTextBoxColumn.HeaderText = "ID";
this.iDDataGridViewTextBoxColumn.Name = "iDDataGridViewTextBoxColumn";
this.iDDataGridViewTextBoxColumn.ReadOnly = true;
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(416, 266);
this.Controls.Add(this.dataGridView1);
this.Controls.Add(this.flowLayoutPanel1);
this.Name = "Form1";
this.Text = "IListSource Sample";
this.flowLayoutPanel1.ResumeLayout(false);
this.flowLayoutPanel1.PerformLayout();
((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).EndInit();
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
}
static class Program
{
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
}
}
Компиляция кода
Для этого примера требуются:
- ссылки на сборки System.Drawing и System.Windows.Forms.