Question

我是PowerShell中WPF的新手。我正在构建一个小应用程序，通过从表单中选择数据库来执行按需SQL备份，如此捕获中所示。 WPF PowerShell Form

我的表单正常，能够进行备份。我现在正在尝试禁用备份/恢复按钮，以便仅在选中至少一个复选框时才可以单击它们。这需要将备份按钮绑定到复选框（在我的理解中）。我已经能够找到一种方法将它与一个复选框绑定，但无法找到一种方法来执行多个复选框。我的XAML复选框和按钮如下所示。

<CheckBox Name="UAT_DB1" Content="UAT-DB1" HorizontalAlignment="Left" Margin="21,113,0,0" VerticalAlignment="Top" Cursor=""/>
<CheckBox Name="UAT_DB2" Content="UAT-DB2" HorizontalAlignment="Left" Margin="21,140,0,0" VerticalAlignment="Top"/>
<Button Name="btn_backup" Content="Backup" HorizontalAlignment="Left" Height="29" Margin="238,343,0,0" VerticalAlignment="Top" Width="78" IsEnabled="{Binding ElementName=UAT_DB1, Path=IsChecked}"/>

如果我选择了DB1，则启用该按钮并单击，检查从所有复选框中选择的内容并备份所有这些数据库。下面是备份按钮上的点击功能代码。

$WPFbtn_backup.Add_Click(
{ 
    foreach($var in $vars)
    {
        if($var.Name -match "WPFUAT" -and $var.Value.IsChecked -eq $true)
        {
            $name = $var.Value.Content
            $dbs = $dbs + $name
        }        
    }
    if ($dbs.Length -gt 0)
    {
        $msg = $dbs -join "`n"       
        $confirmation = [System.Windows.MessageBox]::Show("Following DBs will be backed up.`n`n$msg",'Tipper','OKCancel','Info')
    }
    else
    {
        [System.Windows.MessageBox]::Show("`nYou have to select a DB to backup or restore.",'Tipper','OK','Warning')
    }        
    switch($confirmation)
    {
        'OK'{
            Backup-Database($dbs)
        }
        'Cancel'{
            Write-Host "You clicked No"
        }
    }       
}

）

上面的代码调用函数来备份数据库。此功能如下。

function Backup-Database ($dbnames) 
{    
    foreach( $db in $dbnames )
    {
        Write-Host "[Now backing up $db]"
        Backup-SqlDatabase -Database $db -BackupFile "S:\backup\$db.bak" -ServerInstance localhost
    }
    [System.Windows.MessageBox]::Show("`nDatabase Backup has completed.",'Tipper','OK','Info')    
}

感谢您的阅读和帮助。

Answer 1

在您的XAML代码中使用MultiDataTrigger来定义条件，并在选中一个或多个复选框时删除IsEnabled="{Binding ElementName=UAT_DB1, Path=IsChecked}"启用按钮：

<CheckBox Name="UAT_DB1" Content="UAT-DB1" HorizontalAlignment="Left" Margin="21,113,0,0" VerticalAlignment="Top" Cursor=""/>
<CheckBox Name="UAT_DB2" Content="UAT-DB2" HorizontalAlignment="Left" Margin="21,140,0,0" VerticalAlignment="Top"/>
<Button Name="btn_backup" Content="Backup" HorizontalAlignment="Left" Height="29" Margin="238,343,0,0" VerticalAlignment="Top" Width="78">
    <Button.Style>
        <Style TargetType="Button">
            <Style.Triggers>
                <MultiDataTrigger>
                    <MultiDataTrigger.Conditions>
                        <Condition Binding="{Binding ElementName=UAT_DB1, Path=IsChecked}" Value="False" />
                        <Condition Binding="{Binding ElementName=UAT_DB2, Path=IsChecked}" Value="False" />
                    </MultiDataTrigger.Conditions>
                    <Setter Property="IsEnabled" Value="False" />
                </MultiDataTrigger>
            </Style.Triggers>
        </Style>
    </Button.Style>
</Button>

如何在PowerShell WPF中绑定多个元素

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