分页控件的实现
Demo源文件115
实现虚拟服务类，提供数据
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace PagingDemo {
public class VitrualModel {
public int ID { get; set; }
public string Name { get; set; }
public int Age { get; set; }
}
public class VitrulModelPage {
public int RecordCount { get; set; }
public List<VitrualModel> VitrualModels { get; set; }
}
public class VitrualService {
private List<VitrualModel> list;
public VitrualService(int count) {
list = new List<VitrualModel>();
for (int i = 0; i < count; i++) {
VitrualModel model = new VitrualModel();
model.ID = i + 1;
model.Name = getVitrulName(i);
model.Age = getVitrulAge(i);
list.Add(model);
}
}
public VitrulModelPage GetVitrulModelPage(int first, int last) {
VitrulModelPage page = new VitrulModelPage();
page.VitrualModels = list.Where(m => m.ID >= first && m.ID <= last).ToList();
page.RecordCount = list.Count;
return page;
}
private static string getVitrulName(int r) {
Random random = new Random(r);
int length = random.Next(4, 8);
char[] chars = new char[length];
for (int i = 0; i < chars.Length; i++) {
chars[i] = (char)random.Next(97, 112);
}
return new string(chars);
}
private static int getVitrulAge(int r) {
Random random = new Random(r);
return random.Next(15, 55);
}
}
}
实现分页控件
设计器
namespace PagingDemo {
partial class Paging {
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
/// <param name="disposing">如果应释放托管资源，为 true；否则为 false。</param>
protected override void Dispose(bool disposing) {
if (disposing && (components != null)) {
components.Dispose();
}
base.Dispose(disposing);
}
#region 组件设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要
/// 使用代码编辑器修改此方法的内容。
/// </summary>
private void InitializeComponent() {
this.linkFirst = new System.Windows.Forms.LinkLabel();
this.linkPrevious = new System.Windows.Forms.LinkLabel();
this.linkNext = new System.Windows.Forms.LinkLabel();
this.linkLast = new System.Windows.Forms.LinkLabel();
this.cbxIndex = new System.Windows.Forms.ComboBox();
this.labelStatus = new System.Windows.Forms.Label();
this.label1 = new System.Windows.Forms.Label();
this.SuspendLayout();
//
// linkFirst
//
this.linkFirst.AutoSize = true;
this.linkFirst.Enabled = false;
this.linkFirst.Location = new System.Drawing.Point(3, 8);
this.linkFirst.Name = "linkFirst";
this.linkFirst.Size = new System.Drawing.Size(29, 12);
this.linkFirst.TabIndex = 0;
this.linkFirst.TabStop = true;
this.linkFirst.Text = "首页";
this.linkFirst.LinkClicked += new System.Windows.Forms.LinkLabelLinkClickedEventHandler(this.linkFirst_LinkClicked);
//
// linkPrevious
//
this.linkPrevious.AutoSize = true;
this.linkPrevious.Enabled = false;
this.linkPrevious.Location = new System.Drawing.Point(38, 8);
this.linkPrevious.Name = "linkPrevious";
this.linkPrevious.Size = new System.Drawing.Size(29, 12);
this.linkPrevious.TabIndex = 1;
this.linkPrevious.TabStop = true;
this.linkPrevious.Text = "上页";
this.linkPrevious.LinkClicked += new System.Windows.Forms.LinkLabelLinkClickedEventHandler(this.linkPrevious_LinkClicked);
//
// linkNext
//
this.linkNext.AutoSize = true;
this.linkNext.Enabled = false;
this.linkNext.Location = new System.Drawing.Point(73, 8);
this.linkNext.Name = "linkNext";
this.linkNext.Size = new System.Drawing.Size(29, 12);
this.linkNext.TabIndex = 2;
this.linkNext.TabStop = true;
this.linkNext.Text = "下页";
this.linkNext.LinkClicked += new System.Windows.Forms.LinkLabelLinkClickedEventHandler(this.linkNext_LinkClicked);
//
// linkLast
//
this.linkLast.AutoSize = true;
this.linkLast.Enabled = false;
this.linkLast.Location = new System.Drawing.Point(108, 8);
this.linkLast.Name = "linkLast";
this.linkLast.Size = new System.Drawing.Size(29, 12);
this.linkLast.TabIndex = 3;
this.linkLast.TabStop = true;
this.linkLast.Text = "尾页";
this.linkLast.LinkClicked += new System.Windows.Forms.LinkLabelLinkClickedEventHandler(this.linkLast_LinkClicked);
//
// cbxIndex
//
this.cbxIndex.AutoCompleteMode = System.Windows.Forms.AutoCompleteMode.SuggestAppend;
this.cbxIndex.AutoCompleteSource = System.Windows.Forms.AutoCompleteSource.ListItems;
this.cbxIndex.DropDownStyle = System.Windows.Forms.ComboBoxStyle.DropDownList;
this.cbxIndex.FlatStyle = System.Windows.Forms.FlatStyle.Flat;
this.cbxIndex.FormattingEnabled = true;
this.cbxIndex.Location = new System.Drawing.Point(212, 5);
this.cbxIndex.Name = "cbxIndex";
this.cbxIndex.Size = new System.Drawing.Size(50, 20);
this.cbxIndex.TabIndex = 4;
this.cbxIndex.SelectedIndexChanged += new System.EventHandler(this.comboBox1_SelectedIndexChanged);
//
// labelStatus
//
this.labelStatus.AutoSize = true;
this.labelStatus.Location = new System.Drawing.Point(268, 8);
this.labelStatus.Name = "labelStatus";
this.labelStatus.Size = new System.Drawing.Size(23, 12);
this.labelStatus.TabIndex = 5;
this.labelStatus.Text = "1/1";
//
// label1
//
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(153, 8);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(53, 12);
this.label1.TabIndex = 6;
this.label1.Text = "当前页：";
//
// Paging
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.Controls.Add(this.label1);
this.Controls.Add(this.labelStatus);
this.Controls.Add(this.cbxIndex);
this.Controls.Add(this.linkLast);
this.Controls.Add(this.linkNext);
this.Controls.Add(this.linkPrevious);
this.Controls.Add(this.linkFirst);
this.Name = "Paging";
this.Size = new System.Drawing.Size(306, 28);
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
private System.Windows.Forms.LinkLabel linkFirst;
private System.Windows.Forms.LinkLabel linkPrevious;
private System.Windows.Forms.LinkLabel linkNext;
private System.Windows.Forms.LinkLabel linkLast;
private System.Windows.Forms.ComboBox cbxIndex;
private System.Windows.Forms.Label labelStatus;
private System.Windows.Forms.Label label1;
}
}
逻辑
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
namespace PagingDemo {
/// <summary>
/// By Jusfr 2012-4-24, 盗版不究
/// </summary>
public partial class Paging : UserControl {
public event EventHandler PageIndexChanged;
private bool _initialize = false;
private int _pageSize = 20;
private int _recordCount = 0;
private int _pageIndex = 0;
private int _pageCount = 1;
/// <summary>
/// 获取或设置页面容量
/// </summary>
public int PageSize {
get { return _pageSize; }
set {
if (_pageSize != value) {
OnPageSizeChanging(_pageSize, value);
_pageSize = value;
OnPageSizeChanged();
}
}
}
//页面容量变化，如果已经翻页，则需要重新计算当前页码
protected void OnPageSizeChanging(int oldSize, int newSize) {
if (_pageIndex != 0) {
_pageIndex = _pageIndex * oldSize / newSize;
}
}
//页面容量变化，ComboxBox需要重新填充
protected void OnPageSizeChanged() {
_initialize = true;
_pageCount = Math.Max(1, (int)Math.Ceiling((double)_recordCount / _pageSize));
cbxIndex.DataSource = Enumerable.Range(1, _pageCount).ToList();
cbxIndex.SelectedIndex = _pageIndex;
_initialize = false;
labelStatus.Text = String.Format("{0}/{1}", _pageIndex + 1, _pageCount);
linkFirst.Enabled = _pageIndex != 0;
linkPrevious.Enabled = _pageIndex != 0;
linkNext.Enabled = _pageIndex != _pageCount - 1;
linkLast.Enabled = _pageIndex != _pageCount - 1;
}
/// <summary>
/// 获取或设置页面记录总数
/// </summary>
[Browsable(false)]
public int RecordCount {
get { return _recordCount; }
set {
if (_recordCount != value) {
_recordCount = value;
OnRecordCountChanged();
}
}
}
//记录总数变化，视为数据刷新，重置至起始状态
protected void OnRecordCountChanged() {
_initialize = true;
_pageCount = Math.Max(1, (int)Math.Ceiling((double)_recordCount / _pageSize));
cbxIndex.DataSource = Enumerable.Range(1, _pageCount).ToList();
_initialize = false;
_pageIndex = 0;
labelStatus.Text = String.Format("{0}/{1}", _pageIndex + 1, _pageCount);
linkFirst.Enabled = false;
linkPrevious.Enabled = false;
linkNext.Enabled = _pageIndex != _pageCount - 1;
linkLast.Enabled = _pageIndex != _pageCount - 1;
}
/// <summary>
/// 获取当前页码，从零开始
/// </summary>
[Browsable(false)]
public int PageIndex {
get { return _pageIndex; }
private set {
if (_pageIndex != value) {
_pageIndex = value;
_initialize = true;
cbxIndex.SelectedIndex = _pageIndex;
_initialize = false;
OnPageIndexChanged(EventArgs.Empty);
}
}
}
//翻页了，通知注册的方法
protected void OnPageIndexChanged(EventArgs e) {
labelStatus.Text = String.Format("{0}/{1}", _pageIndex + 1, _pageCount);
linkFirst.Enabled = _pageIndex != 0;
linkPrevious.Enabled = _pageIndex != 0;
linkNext.Enabled = _pageIndex != _pageCount - 1;
linkLast.Enabled = _pageIndex != _pageCount - 1;
if (PageIndexChanged != null) {
PageIndexChanged(this, e);
}
}
/// <summary>
/// 获取当前第一条记录的行号
/// </summary>
[Browsable(false)]
public int FirstRecordNumber {
get {
return _pageIndex * _pageSize + 1;
}
}
/// <summary>
/// 获取当前最后一条记录的行号
/// </summary>
[Browsable(false)]
public int LastRecrodNumber {
get {
return (_pageIndex + 1) * _pageSize;
}
}
public Paging() {
InitializeComponent();
_initialize = true;
cbxIndex.DataSource = new List<int> { 1 };
}
//首页
private void linkFirst_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e) {
PageIndex = 0;
}
//前一页
private void linkPrevious_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e) {
PageIndex -= 1;
}
//后一页
private void linkNext_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e) {
PageIndex += 1;
}
//末页
private void linkLast_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e) {
PageIndex = _pageCount - 1;
}
//ComboBox
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e) {
if (!_initialize) {
ComboBox box = sender as ComboBox;
PageIndex = box.SelectedIndex;
}
}
}
}
Demo
设计器
namespace PagingDemo {
partial class Form3 {
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing) {
if (disposing && (components != null)) {
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent() {
this.dataGridView1 = new System.Windows.Forms.DataGridView();
this.button1 = new System.Windows.Forms.Button();
this.textBox1 = new System.Windows.Forms.TextBox();
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.textBox2 = new System.Windows.Forms.TextBox();
this.button2 = new System.Windows.Forms.Button();
this.paging1 = new PagingDemo.Paging();
((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).BeginInit();
this.SuspendLayout();
//
// dataGridView1
//
this.dataGridView1.AllowUserToAddRows = false;
this.dataGridView1.AllowUserToDeleteRows = false;
this.dataGridView1.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
this.dataGridView1.Location = new System.Drawing.Point(12, 53);
this.dataGridView1.Name = "dataGridView1";
this.dataGridView1.ReadOnly = true;
this.dataGridView1.RowTemplate.Height = 23;
this.dataGridView1.Size = new System.Drawing.Size(581, 277);
this.dataGridView1.TabIndex = 0;
//
// button1
//
this.button1.Location = new System.Drawing.Point(178, 10);
this.button1.Name = "button1";
this.button1.Size = new System.Drawing.Size(75, 23);
this.button1.TabIndex = 2;
this.button1.Text = "设置";
this.button1.UseVisualStyleBackColor = true;
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// textBox1
//
this.textBox1.Location = new System.Drawing.Point(412, 12);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(100, 21);
this.textBox1.TabIndex = 3;
this.textBox1.Text = "45";
//
// label1
//
this.label1.AutoSize = true;
this.label1.Location = new System.Drawing.Point(353, 15);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(53, 12);
this.label1.TabIndex = 4;
this.label1.Text = "记录总数";
//
// label2
//
this.label2.AutoSize = true;
this.label2.Location = new System.Drawing.Point(13, 15);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(53, 12);
this.label2.TabIndex = 5;
this.label2.Text = "分页容量";
//
// textBox2
//
this.textBox2.Location = new System.Drawing.Point(72, 12);
this.textBox2.Name = "textBox2";
this.textBox2.Size = new System.Drawing.Size(100, 21);
this.textBox2.TabIndex = 6;
//
// button2
//
this.button2.Location = new System.Drawing.Point(518, 12);
this.button2.Name = "button2";
this.button2.Size = new System.Drawing.Size(75, 23);
this.button2.TabIndex = 7;
this.button2.Text = "刷新";
this.button2.UseVisualStyleBackColor = true;
this.button2.Click += new System.EventHandler(this.button2_Click);
//
// paging1
//
this.paging1.Location = new System.Drawing.Point(15, 337);
this.paging1.Name = "paging1";
this.paging1.PageSize = 10;
this.paging1.RecordCount = 0;
this.paging1.Size = new System.Drawing.Size(306, 28);
this.paging1.TabIndex = 8;
this.paging1.PageIndexChanged += new System.EventHandler(this.paging1_PageIndexChanged);
//
// Form3
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(605, 376);
this.Controls.Add(this.paging1);
this.Controls.Add(this.button2);
this.Controls.Add(this.textBox2);
this.Controls.Add(this.label2);
this.Controls.Add(this.label1);
this.Controls.Add(this.textBox1);
this.Controls.Add(this.button1);
this.Controls.Add(this.dataGridView1);
this.Name = "Form3";
this.Text = "Form3";
this.Load += new System.EventHandler(this.Form2_Load);
((System.ComponentModel.ISupportInitialize)(this.dataGridView1)).EndInit();
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
private System.Windows.Forms.DataGridView dataGridView1;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.TextBox textBox2;
private System.Windows.Forms.Button button2;
private Paging paging1;
}
}
逻辑
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;
namespace PagingDemo {
public partial class Form3 : Form {
private VitrualService service;
public Form3() {
InitializeComponent();
}
private void Form2_Load(object sender, EventArgs e) {
textBox2.Text = paging1.PageSize.ToString();
}
private void query() {
try {
int recordCount = Int32.Parse(textBox1.Text);
int pageSize = Int32.Parse(textBox2.Text);
service = new VitrualService(recordCount);
VitrulModelPage page = service.GetVitrulModelPage(paging1.FirstRecordNumber, paging1.LastRecrodNumber);
paging1.RecordCount = page.RecordCount;
dataGridView1.DataSource = page.VitrualModels;
}
catch (Exception ex) {
MessageBox.Show(ex.Message);
}
}
private void button1_Click(object sender, EventArgs e) {
try {
int pageSize = Int32.Parse(textBox2.Text);
paging1.PageSize = pageSize;
//query();
}
catch (Exception ex) {
MessageBox.Show(ex.Message);
}
}
private void button2_Click(object sender, EventArgs e) {
query();
}
private void paging1_PageIndexChanged(object sender, EventArgs e) {
query();
}
}
}
