C＃WinForm的事件處理程序

我有2個構造函數在我的課：C＃WinForm的事件處理程序

public partial class Fiche_Ordre : Le_MainForm 
    { 
     public Fiche_Ordre() 
       { 
        InitializeComponent();   
        Constuct_Page();    
       } 

       public Fiche_Ordre(string OrderID): this() 
       { 


        Pers_Ordre oPersOrdr = oOrder_BL.Get_OrdreOne_BL(ClientID, Convert.ToInt32(OrderID), false); 

       textEdit_RefExpred.Text = oPersOrdr.RefExpd; 
       lookUpEdit_Agence.EditValue = oPersOrdr.Agence; 
       lookUpEdit_Transport.EditValue = oPersOrdr.Transporteur; 

       lookUpEdit_Dest.EditValue = oPersOrdr.DestId; 
    .................. 

       } 


       public void Constuct_Page() 
       { 
        try 
        { 
         ClientID = Program.Le_ClientID; 
         .... 

       #region LookUpEdidt Destinataire 

        lookUpEdit_Dest.Properties.DataSource = Auxiliaire_BL.FillCombo_BL(false, ClientID).Tables["ComboFill"]; 
        lookUpEdit_Dest.Properties.ValueMember = "CODE_DEST"; 
        lookUpEdit_Dest.Properties.DisplayMember = "CODE_DEST"; 
        LookUpColumnInfoCollection coll_Dest = lookUpEdit_Dest.Properties.Columns; 
        // A column to display the ProductID field's values. 
        coll_Dest.Add(new LookUpColumnInfo("CODE_DEST", 0, "Code Destinataire")); 
        // A column to display the ProductName field's values. 
        coll_Dest.Add(new LookUpColumnInfo("RS_NOM", 0, "Raison Social")); 
        // Set column widths according to their contents and resize the popup, if required. 
        lookUpEdit_Dest.Properties.BestFitMode = BestFitMode.BestFitResizePopup; 
        // Enable auto completion search mode. 
        lookUpEdit_Dest.Properties.SearchMode = SearchMode.AutoComplete; 
        // Specify the column against which to perform the search. 
        lookUpEdit_Dest.Properties.AutoSearchColumnIndex = 1; 
        lookUpEdit_Dest.EditValueChanged += new EventHandler(lookUpEdit_Dest_EditValueChanged); 
       #endregion 
     ... 
     }

很奇怪，因爲當我使用public Fiche_Ordre()它不火new EventHandler(lookUpEdit_Dest_EditValueChanged);;但是當我使用public Fiche_Ordre(string OrderID)時，它會觸發事件處理程序。

這是正常與否？

第一constuctor它的主要形式

public partial class Le_MainForm : DevExpress.XtraEditors.XtraForm 
    { 
     public Le_MainForm() 
     { 
      InitializeComponent(); 

      this.Name = "MainUSER"; 

      if (Program.IsFA) barButtonItem_OrdList.Visibility = DevExpress.XtraBars.BarItemVisibility.Never; 


     } 

private void barButtonItem_CreatOrdreAller_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e) 
     { 
      Close_AllForm(); 
      Program.AllerRetour = "Ordre Aller"; 
      Fiche_Ordre f_Fiche = new Fiche_Ordre(); 

      f_Fiche.Show(); 
     }

呼叫和第二構造我把它從

public partial class Liste_Ordres : Le_MainForm 
    { 

    private void Liste_DobleClic(object sender, EventArgs e) 
      { 
       try 
       { 
        Program.OrderId = gridView_Liste_Ordres.GetFocusedRowCellValue("NO_ORDRE").ToString(); 
        this.Hide(); 
        Fiche_Ordre f_Fiche = new Fiche_Ordre(gridView_Liste_Ordres.GetFocusedRowCellValue("NO_ORDRE").ToString()); 
        f_Fiche.Show(); 
       } 
       catch (Exception excThrown) 
       { 
        MessageBox.Show(excThrown.Message); 
       } 
      }

預先感謝您。 PS：第一個構造函數只是創建NEW空白頁，第二個構造函數是創建NOT NEW（編輯頁面），所以我傳遞了id並填充了所有控件（文本框，備忘錄等等）。）

來源

2012-05-02 user609511

你在第二個構造函數中使用了OrderID？ – McGarnagle

@dbaseman這是如何幫助你解決問題的？ – Likurg

@Likurg，因爲這是兩個構造函數之間的唯一區別，我認爲它可能是相關的，呃？ – McGarnagle

EditValueChanged手柄在最後一行Constuct_Page中連線。因此它僅在Constuct_Page之後發生變化。它是否在..................部分代碼中發生了變化？這聽起來像一個過於簡單化的猜測，但它是值得仔細檢查反正...

此外，我可以建議你另外一個改進：

public Fiche_Ordre(string OrderID) : this.Fiche_Ordre() { // invokes the other constructor first, so they're guaranteed // do be equivalent in the first part Pers_Ordre oPersOrdr = oOrder_BL.Get_OrdreOne_BL(ClientID, Convert.ToInt32(OrderID), false); // ... }

來源

2012-05-02 08:28:46