C# Winform 分页功能的实现
作者：正人君子！
本文主要介绍了C# Winform 分页功能的实现，文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值，需要的朋友们下面随着小编来一起学习学习吧
首先创建一个用户控件 如下图 用到的控件 label、button、TextBox
内部代码如下
#region 分页字段和属性
private int pageIndex = 1;
/// <summary>
/// 当前页数
/// </summary>
public virtual int PageIndex
{
get { return pageIndex; }
set { pageIndex = value; }
}
private int pageSize = 100;
/// <summary>
/// 每页记录数
/// </summary>
public virtual int PageSize
{
get { return pageSize; }
set { pageSize = value; }
}
private int recordCount = 0;
/// <summary>
/// 总记录数
/// </summary>
public virtual int RecordCount
{
get { return recordCount; }
set { recordCount = value; }
}
private int pageCount = 0;
/// <summary>
/// 总页数
/// </summary>
public int PageCount
{
get
{
if (pageSize != 0)
{
pageCount = GetPageCount();
}
return pageCount;
}
}
#endregion
#region 页码变化时触发事件
public event EventHandler OnPageChanged;
#endregion
#region 分页及相关事件功能实现
/// <summary>
/// 设窗体控件全部可用
/// </summary>
private void SetFormCtrEnabled()
{
linkFirst.Enabled = true;
linkPrevious.Enabled = true;
linkNext.Enabled = true;
linkLast.Enabled = true;
btnGo.Enabled = true;
}
/// <summary>
/// 计算总页数
/// </summary>
/// <returns></returns>
private int GetPageCount()
{
if (PageSize == 0)
{
return 0;
}
int pageCount = RecordCount / PageSize;
if (RecordCount % PageSize == 0)
{
pageCount = RecordCount / PageSize;
}
else
{
pageCount = RecordCount / PageSize + 1;
}
return pageCount;
}
/// <summary>
/// 用于客户端调用
/// </summary>
public void DrawControl(int count)
{
recordCount = count;
DrawControl(false);
}
/// <summary>
/// 根据不同的条件，改变页面控件的呈现状态
/// </summary>
private void DrawControl(bool callEvent)
{
lblCurrentPage.Text = PageIndex.ToString();
lblPageCount.Text = PageCount.ToString();
lblTotalCount.Text = RecordCount.ToString();
txtPageSize.Text = PageSize.ToString();
if (callEvent && OnPageChanged != null)
{
OnPageChanged(this, null);//当前分页数字改变时，触发委托事件
}
SetFormCtrEnabled();
if (PageCount == 1)//有且仅有一页时
{
linkFirst.Enabled = false;
linkPrevious.Enabled = false;
linkNext.Enabled = false;
linkLast.Enabled = false;
btnGo.Enabled = false;
}
else if (PageIndex == 1)//当前页为第一页时
{
linkFirst.Enabled = false;
linkPrevious.Enabled = false;
}
else if (PageIndex == PageCount)//当前页为最后一页时
{
linkNext.Enabled = false;
linkLast.Enabled = false;
}
}
#endregion
#region 相关控件事件
//首页按钮
private void linkFirst_Click(object sender, EventArgs e)
{
PageIndex = 1;
DrawControl(true);
}
//上一页按钮
private void linkPrevious_Click(object sender, EventArgs e)
{
PageIndex = Math.Max(1, PageIndex - 1);
DrawControl(true);
}
//下一页按钮
private void linkNext_Click(object sender, EventArgs e)
{
PageIndex = Math.Min(PageCount, PageIndex + 1);
DrawControl(true);
}
//尾页按钮
private void linkLast_Click(object sender, EventArgs e)
{
PageIndex = PageCount;
DrawControl(true);
}
/// <summary>
/// 按下enter键，执行跳转页面功能
/// </summary>
private void txtPageNum_KeyPress(object sender, KeyPressEventArgs e)
{
btnGo_Click(null, null);
}
/// <summary>
/// 跳转页数限制
/// </summary>
private void txtPageNum_TextChanged(object sender, EventArgs e)
{
int num = 0;
if (int.TryParse(txtPageNum.Text.Trim(), out num) && num > 0)
{ //TryParse 函数，将字符串转换成等效的整数，返回bool型，判断是否转换成功。
//输入除数字以外的字符是转换不成功的
if (num > PageCount) //输入数量大于最大页数时，文本框自动显示最大页数
{
txtPageNum.Text = PageCount.ToString();
}
}
}
/// <summary>
/// 跳转按钮
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnGo_Click(object sender, EventArgs e)
{
int num = 0;
if (int.TryParse(txtPageNum.Text.Trim(), out num) && num > 0)
{
PageIndex = num;
DrawControl(true);
}
}
#endregion
bool isTextChanged = false;
/// <summary>
/// 每页显示的记录数改变时
/// </summary>
private void txtPageSize_TextChanged(object sender, EventArgs e)
{
int num = 0;
//输入不符合规范时，默认设置为100
if (!int.TryParse(txtPageSize.Text.Trim(), out num) || num <= 0)
{
num = 100;
txtPageSize.Text = "100";
}
else
{
isTextChanged = true;
}
pageSize = num;
}
/// <summary>
/// 光标离开 每页设置文本框时，显示到首页
private void txtPageSize_Leave(object sender, EventArgs e)
{
if (isTextChanged)
{
isTextChanged = false;
linkFirst_Click(null, null);
}
}符合我的分页查询方法
/// <summary>
/// 通用分页查询方法
/// </summary>
/// <param name="tableName">表名</param>
/// <param name="strColumns">查询字段名</param>
/// <param name="strWhere">where条件</param>
/// <param name="strOrder">排序条件</param>
/// <param name="pageSize">每页数据数量</param>
/// <param name="currentIndex">当前页数</param>
/// <param name="recordOut">数据总量</param>
/// <returns>DataTable数据表</returns>
public static List<String[]> SelectPaging(string tableName, string strColumns, string strWhere, string strOrder, int pageSize, int currentIndex, out int recordOut)
{
List<String[]> res;
recordOut = Convert.ToInt32(search(string.Format("select count(*) from {0} where{1}" ,tableName, strWhere))[0][0]);
string pagingTemplate = "select {0} from {1} where {2} order by {3} limit {4} offset {5} ";
int offsetCount = (currentIndex - 1) * pageSize;
string commandText = String.Format(pagingTemplate, strColumns, tableName, strWhere, strOrder, pageSize.ToString(), offsetCount.ToString());
res = search(commandText);
return res;
}附上我修改前的分页查询方法
/// <summary>
/// 通用分页查询方法
/// </summary>
/// <param name="connString">连接字符串</param>
/// <param name="tableName">表名</param>
/// <param name="strColumns">查询字段名</param>
/// <param name="strWhere">where条件</param>
/// <param name="strOrder">排序条件</param>
/// <param name="pageSize">每页数据数量</param>
/// <param name="currentIndex">当前页数</param>
/// <param name="recordOut">数据总量</param>
/// <returns>DataTable数据表</returns>
public static DataTable SelectPaging(string tableName, string strColumns, string strWhere, string strOrder, int pageSize, int currentIndex, out int recordOut)
{
DataTable dt = new DataTable();
recordOut = Convert.ToInt32(ExecuteScalar( "select count(*) from " + tableName));
string pagingTemplate = "select {0} from {1} where {2} order by {3} limit {4} offset {5} ";
int offsetCount = (currentIndex - 1) * pageSize;
string commandText = String.Format(pagingTemplate, strColumns, tableName, strWhere, strOrder, pageSize.ToString(), offsetCount.ToString());
DataSet ds= ExecuteDataSet(commandText);
dt = ds.Tables[0];
return dt;
}两种使用方式
1、数据库查询
private void pagerControl1_OnPageChanged(object sender, EventArgs e)
{
initData();
}
public CompanyData()
{
InitializeComponent();
initData();
//激活OnPageChanged事件
pagerControl1.OnPageChanged += new EventHandler(pagerControl1_OnPageChanged);
}
private void initData()
{
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.Append(" 1=1 ");
if (this.TbComName.Text != "")
{
stringBuilder.Append("and comName like '%" + this.TbComName.Text + "%'");
}
int RecordCount;
List<String[]> res = DBHelper.SelectPaging("T_DM_COMPANY", " comId,comCode,comName,configureCode", stringBuilder.ToString(), " configureCode DESC ,comCode", pagerControl1.PageSize, pagerControl1.PageIndex, out RecordCount);
List<Company> list = new List<Company>();
for (int i = 0; i < res.Count; i++)
{
list.Add(new Company(res[i]));
}
pagerControl1.DrawControl(RecordCount);
BindingSource bs = new BindingSource();
bs.DataSource = list;
this.CompanyDataDGW.DataSource = bs;
}2、文件读取数据 分页
private void pagerControl1_OnPageChanged(object sender, EventArgs e)
{
Init();
}
public ProductionConfig()
{
InitializeComponent();
Init();
//激活OnPageChanged事件
pagerControl1.OnPageChanged += new EventHandler(pagerControl1_OnPageChanged);
}
private void Init()
{
//获取template 中ip配置文件信息
//String[] temIp = PropertiesGenerateUtil.getTemplate("template/ip.properties");
int RecordCount;
String[] temIp = PropertiesGenerateUtil.getTemplatePaging("template/ip.properties",pagerControl1.PageSize,pagerControl1.PageIndex,out RecordCount);
List<entity.templateIp> templateIps = new List<entity.templateIp>();
foreach (var item in temIp)
{
templateIps.Add(new entity.templateIp(item.Substring(0, item.IndexOf("="))));
}
pagerControl1.DrawControl(RecordCount);
BindingSource bs = new BindingSource();
bs.DataSource = templateIps;
this.DGVTemplateIp.DataSource = bs;
}
/// <summary>
/// 分页查询文件数据
/// </summary>
/// <param name="path">文件路径</param>
/// <param name="pageSize">每页数量</param>
/// <param name="currentIndex">当前页数</param>
/// <param name="recordOut">数据总量</param>
/// <returns></returns>
public static string[] getTemplatePaging(string path, int pageSize, int currentIndex, out int recordOut)
{
string[] str;
recordOut = getTemplate(path).Count();
using (StreamReader sr = new StreamReader(path))
{
string line;
List<string> list = new List<string> { };
// 1 0 1*100
// 2 100 2*100
int startingValue = (currentIndex - 1) * pageSize;//起始值
int terminationValue = currentIndex * pageSize;//终止值
int tempValue = 0;//计数器
while ((line = sr.ReadLine()) != null)
{
if (line.Contains("#"))//判断是注释跳出
continue;
if(tempValue>=startingValue&&tempValue< terminationValue)//判断是起始值添加
list.Add(line);
if (tempValue == terminationValue)//判断是终止值跳出
break;
tempValue++;
}
str = list.ToArray<String>();
}
return str;
}附上运行结果
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