BeforeDropDown イベント (UltraDateTimeEditor)

ドロップダウン カレンダーがドロップダウンされる前に発生します。

シンタックス

Visual Basic

'宣言
 
Public Event BeforeDropDown As CancelEventHandler

C#

public event CancelEventHandler BeforeDropDown

イベント データ

イベント ハンドラが、このイベントに関連するデータを含む、CancelEventArgs 型の引数を受け取りました。次の CancelEventArgs プロパティには、このイベントの固有の情報が記載されます。

プロパティ	解説
Cancel

使用例

Visual Basic

Imports Infragistics.Win
Imports Infragistics.Win.UltraWinEditors

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        '	Set focus to the UltraDateTimeEditor
        Me.UltraDateTimeEditor1.Focus()

        '	Set the AlwaysInEditMode property to false
        Me.UltraDateTimeEditor1.AlwaysInEditMode = False

        '	Don't allow null values
        Me.UltraDateTimeEditor1.Nullable = False

        '	Set the DateTime property to the current date
        Me.UltraDateTimeEditor1.DateTime = DateTime.Today

        '	Use the text selection-related properties to clear the edit portion
        Me.UltraDateTimeEditor1.SelectionStart = 0
        Me.UltraDateTimeEditor1.SelectionLength = Me.UltraDateTimeEditor1.Value.ToString().Length
        Me.UltraDateTimeEditor1.SelectedText = ""

    End Sub

    Private Sub UltraDateTimeEditor1_BeforeDropDown(ByVal sender As System.Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles UltraDateTimeEditor1.BeforeDropDown

        If (Not Me.UltraDateTimeEditor1.IsDateValid) Then
            e.Cancel = True
            MessageBox.Show("Please type a valid date.", "BeforeDropDown", MessageBoxButtons.OK)
        End If

    End Sub

C#

using System.Diagnostics;
using Infragistics.Win;
using Infragistics.Win.UltraWinEditors;

		private void button1_Click(object sender, System.EventArgs e)
		{
			//	Set focus to the UltraDateTimeEditor
			this.ultraDateTimeEditor1.Focus();

			//	Set the AlwaysInEditMode property to false
			this.ultraDateTimeEditor1.AlwaysInEditMode = false;

			//	Don't allow null values
			this.ultraDateTimeEditor1.Nullable = false;
		
			//	Set the DateTime property to the current date
			this.ultraDateTimeEditor1.DateTime = DateTime.Today;

			//	Use the text selection-related properties to clear the edit portion
			this.ultraDateTimeEditor1.SelectionStart = 0;
			this.ultraDateTimeEditor1.SelectionLength = this.ultraDateTimeEditor1.Value.ToString().Length;
			this.ultraDateTimeEditor1.SelectedText = "";
		}	

		private void ultraDateTimeEditor1_BeforeDropDown(object sender, System.ComponentModel.CancelEventArgs e)
		{
			if ( ! this.ultraDateTimeEditor1.IsDateValid )
			{
				e.Cancel = true;

				MessageBox.Show( "Please type a valid date.", "BeforeDropDown", MessageBoxButtons.OK );
			}
		}