如何在取消按鈕單擊UltraGrid時停止單元格驗證

Question

在我的ultragrid中，我有一個Nullable = Disallow的列，表示該字段不能爲空。如果我嘗試將我的列編輯爲空白字符串，則會引發我的CellDataError事件，如我所料。然後，然後，我想在整個對話框中單擊「取消」（單元格仍爲空白），然後再次觸發驗證。

如何在單擊取消按鈕時跳過驗證？

Answer 1

爲了跳過驗證，當單擊取消按鈕時必須允許可爲空的值，然後在更新單元格時再次禁止可以爲空的值。以下是您如何使用代碼實現它。

public partial class Form1 : Form 
{ 
    public Form1() 
    { 
     InitializeComponent(); 
    } 

    private void Form1_Load(object sender, EventArgs e) 
    { 
     this.ultraGrid1.DataSource = InitializeGridSource(); 
     this.ultraGrid1.DisplayLayout.Bands[0].Columns[0].Nullable = Infragistics.Win.UltraWinGrid.Nullable.Disallow; 
     this.ultraGrid1.AfterCellUpdate += new CellEventHandler(ultraGrid1_AfterCellUpdate); 
     this.Deactivate += new EventHandler(Form1_Deactivate); 
    } 

    private void ultraGrid1_AfterCellUpdate(object sender, Infragistics.Win.UltraWinGrid.CellEventArgs e) 
    { 
     this.ultraGrid1.ActiveCell.Column.Nullable = Infragistics.Win.UltraWinGrid.Nullable.Disallow; 
    } 

    private void Form1_Deactivate(object sender, EventArgs e) 
    { 
     if (this.OwnedForms.Length > 0 && this.OwnedForms[0].Text == "Data Error") 
     { 
      this.OwnedForms[0].FormClosing += new FormClosingEventHandler(Form1_FormClosing); 
     } 
    } 

    private void Form1_FormClosing(object sender, FormClosingEventArgs e) 
    { 
     if ((sender as Form).DialogResult == System.Windows.Forms.DialogResult.Cancel) 
     { 
      var activeCell = this.ultraGrid1.ActiveCell; 
      activeCell.Column.Nullable = Infragistics.Win.UltraWinGrid.Nullable.Automatic; 
      activeCell.EditorResolved.ExitEditMode(forceExit: true, applyChanges: true); 
      this.ultraGrid1.UpdateData();  
     } 
    } 

    private DataTable InitializeGridSource(int rows = 7) 
    { 
     DataTable newTable = new DataTable("Table1"); 

     newTable.Columns.Add("String Column", typeof(string)); 

     for (int index = 0; index < rows; index++) 
     { 
      newTable.Rows.Add(new object[] { "Text " + index }); 
     } 

     return newTable; 
    } 
}