Question

我无法解决验证事件。我创建了一个非常简单的窗体来演示这个问题。该表单包含两个文本框，我希望在第一个文本框中按Tab键时触发验证事件，但事实并非如此。我正在使用在Windows 7 Professional SP1下运行的Powershell V4.0。代码如下： -

Function ValidateField( [string]$FieldValue )
{
    Write-Host "ValidateField: Function Entered"

    if ( $FieldValue -eq $Null -Or $FieldValue.Trim().Length -eq 0 ) { Return $True } else { Return $False }
}

Function GenerateForm 
{
    Write-Host "GenerateForm: Function Entered"

    [Reflection.Assembly]::LoadWithPartialName( "System.Windows.Forms"  ) | Out-Null
    [Reflection.Assembly]::LoadWithPartialName( "System.Drawing"  ) | Out-Null

    $Form = New-Object System.Windows.Forms.Form ; $IFWS = New-Object System.Windows.Forms.FormWindowState
    $Code = New-Object System.Windows.Forms.TextBox ; $Desc = New-Object System.Windows.Forms.TextBox
    $Form.ClientSize = New-Object System.Drawing.Size( 400,200 ) 
    $Form.StartPosition = "CenterScreen" ; $Form.add_Load( $FormLoad )

    $OnLoadForm_StateCorrection = { $Form.WindowState = $IFWS }

    $Code.DataBindings.DefaultDataSourceUpdateMode = 0 ; $Code.Location = New-Object System.Drawing.Size( 10,10 )
    $Code.Size = New-Object System.Drawing.Size( 40,20 ) ; $Code.CausesValidation = $True

    $Code_Validating = [System.ComponentModel.CancelEventHandler] { 

        { $Result = ( ValidateField $Code.Text )

        if ( $Result -eq $True ) { $_.Cancel = $True } }
    }

    $Form.Controls.Add( $Code )

    $Desc.DataBindings.DefaultDataSourceUpdateMode = 0 ; $Desc.Location = New-Object System.Drawing.Size( 100,10 )
    $Desc.Size = New-Object System.Drawing.Size( 169,20 ) ; $Form.Controls.Add( $Desc )

    $IFWS = $Form.WindowState ; $Form.add_Load( $OnLoadForm_StateCorrection ) ; $Form.ShowDialog() | Out-Null
}

GenerateForm

我可能只是错过了一些非常简单的事情 - 但这已经让我疯了3天了，所以任何帮助都会感激不尽。

Answer 1

我看不到您要连接到Validating事件的位置。用以下代码替换$ Code_Validating作业：

$Code.add_Validating({ 
    $result = ValidateField $sender.Text
    if ($result) {$eventArgs.Cancel = $true}
})

验证事件未触发

1 个答案: