WinForm下編寫分頁控制元件,實現DataGridView的分頁效果
阿新 • • 發佈:2019-02-09
前幾天做C/S專案的時候用到了分頁查詢,所以就想去網上找一些封裝好的分頁控制元件,類似BS專案中的那種。但是找了好幾個都不是特別的好,沒有自己想要的。而且WinForm 裡面的DataGridView也不像WebForm裡面的GridView那樣有自帶的分頁功能。沒辦法還是自己動手封裝一個吧,以後複用也方便。
從網上找了幾個demo做了一下,實現挺簡單的。
用到的方法就是編寫一個使用者控制元件,下面說明如何實現:
一,先畫介面
新建一個使用者控制元件,然後拖拽幾個標籤,文字框和按鈕,排列好。如下圖所示:
二,編寫程式碼
public partial class PagerControl : UserControl { #region 建構函式 public PagerControl() { InitializeComponent(); } #endregion #region 分頁欄位和屬性 private int pageIndex = 1; /// <summary> /// 當前頁數 /// </summary> public virtual int PageIndex { get { return pageIndex; } set { pageIndex = value; } } private int pageSize = 100; /// <summary> /// 每頁記錄數 /// </summary> public virtual int PageSize { get { return pageSize; } set { pageSize = value; } } private int recordCount = 0; /// <summary> /// 總記錄數 /// </summary> public virtual int RecordCount { get { return recordCount; } set { recordCount = value; } } private int pageCount = 0; /// <summary> /// 總頁數 /// </summary> public int PageCount { get { if (pageSize != 0) { pageCount = GetPageCount(); } return pageCount; } } #endregion #region 頁碼變化時觸發事件 public event EventHandler OnPageChanged; #endregion #region 分頁及相關事件功能實現 /// <summary> /// 設窗體控制元件全部可用 /// </summary> private void SetFormCtrEnabled() { linkFirst.Enabled = true; linkPrevious.Enabled = true; linkNext.Enabled = true; linkLast.Enabled = true; btnGo.Enabled = true; } /// <summary> /// 計算總頁數 /// </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> /// 用於客戶端呼叫 /// </summary> public void DrawControl(int count) { recordCount = count; DrawControl(false); } /// <summary> /// 根據不同的條件,改變頁面控制元件的呈現狀態 /// </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);//當前分頁數字改變時,觸發委託事件 } SetFormCtrEnabled(); if (PageCount == 1)//有且僅有一頁時 { linkFirst.Enabled = false; linkPrevious.Enabled = false; linkNext.Enabled = false; linkLast.Enabled = false; btnGo.Enabled = false; } else if (PageIndex == 1)//當前頁為第一頁時 { linkFirst.Enabled = false; linkPrevious.Enabled = false; } else if (PageIndex == PageCount)//當前頁為最後一頁時 { linkNext.Enabled = false; linkLast.Enabled = false; } } #endregion #region 相關控制元件事件 //首頁按鈕 private void linkFirst_Click(object sender, EventArgs e) { PageIndex = 1; DrawControl(true); } //上一頁按鈕 private void linkPrevious_Click(object sender, EventArgs e) { PageIndex = Math.Max(1, PageIndex - 1); DrawControl(true); } //下一頁按鈕 private void linkNext_Click(object sender, EventArgs e) { PageIndex = Math.Min(PageCount, PageIndex + 1); DrawControl(true); } //尾頁按鈕 private void linkLast_Click(object sender, EventArgs e) { PageIndex = PageCount; DrawControl(true); } /// <summary> /// 按下enter鍵,執行跳轉頁面功能 /// </summary> private void txtPageNum_KeyPress(object sender, KeyPressEventArgs e) { btnGo_Click(null, null); } /// <summary> /// 跳轉頁數限制 /// </summary> private void txtPageNum_TextChanged(object sender, EventArgs e) { int num = 0; if (int.TryParse(txtPageNum.Text.Trim(), out num) && num > 0) { //TryParse 函式,將字串轉換成等效的整數,返回bool型,判斷是否轉換成功。 //輸入除數字以外的字元是轉換不成功的 if (num > PageCount) //輸入數量大於最大頁數時,文字框自動顯示最大頁數 { txtPageNum.Text = PageCount.ToString(); } } } /// <summary> /// 跳轉按鈕 /// </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> /// 每頁顯示的記錄數改變時 /// </summary> private void txtPageSize_TextChanged(object sender, EventArgs e) { int num = 0; //輸入不符合規範時,預設設定為100 if (!int.TryParse(txtPageSize.Text.Trim(), out num) || num <= 0) { num = 100; txtPageSize.Text = "100"; } else { isTextChanged = true; } pageSize = num; } /// <summary> /// 游標離開 每頁設定文字框時,顯示到首頁 private void txtPageSize_Leave(object sender, EventArgs e) { if (isTextChanged) { isTextChanged = false; linkFirst_Click(null, null); } } }
三,客戶端呼叫
public partial class frmPagerDemo : Form { public frmPagerDemo() { InitializeComponent(); } private void StartForm_Load(object sender, EventArgs e) { //建立一個檔案資料庫表。 MDataTable.CreateSchema("Users.txt", false, new string[] { "選擇", "使用者名稱", "密碼", "性別", "註冊日期" }, SqlDbType.Bit, SqlDbType.NVarChar, SqlDbType.NVarChar, SqlDbType.NVarChar, SqlDbType.NVarChar); for (int i = 0; i < 200; i++)//插入200條資料。 { using (MAction action = new MAction("Users.txt", "Txt Path={0}")) { action.Set("選擇", i % 2 == 0); action.Set("使用者名稱", "Obama_" + i); action.Set("密碼", "123" + i); action.Set("性別", "男"); action.Set("註冊日期", DateTime .Now.ToShortDateString()); action.Insert(InsertOp.None); } } LoadData(); //啟用OnPageChanged事件 pagerControl1.OnPageChanged += new EventHandler(pagerControl1_OnPageChanged); } /// <summary> /// 頁數變化時呼叫繫結資料方法 /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private void pagerControl1_OnPageChanged(object sender, EventArgs e) { LoadData(); } /// <summary> /// 重新載入資料 /// </summary> private void LoadData() { int count; using (MAction action = new MAction("Users.txt", "Txt Path={0}")) { action.Select(pagerControl1.PageIndex, pagerControl1.PageSize, string.Empty, out count).Bind(gvUsers); pagerControl1.DrawControl(count); } } }
四,顯示效果
至此一個WinForm版的分頁控制元件製作就完成了。
有問題的地方歡迎指出。