IsNull Property (Document)

Gets a value that indicates whether or not the value of the document is null value.

Syntax

public bool IsNull {get;}

Property Value

Type: System.Boolean
true if the document value is null, otherwise false.

Example

The following code example uses the IsNull property.

public static int Execute(Instance instance, IZennoPosterProjectModel project)
{
    // clear cookies
    instance.ClearCookie();
    
    // go to lessons.zennolab.com
    Tab tab = instance.MainTab;
    if ((tab.IsVoid) || (tab.IsNull)) return -1;
    if (tab.IsBusy) tab.WaitDownloading();
    tab.Navigate("lessons.zennolab.com");
    if (tab.IsBusy) tab.WaitDownloading();
    
    // get document
    Document doc = tab.MainDocument;
    
    // if document is null then exit
    if (doc.IsNull) return -1;
    
    return 0;
}

public static function Execute($instance, $project)
{
    // clear cookies
    $instance->ClearCookie();
    
    // go to lessons.zennolab.com
    $tab = $instance->MainTab;
    if (($tab->IsVoid) || ($tab->IsNull)) return -1;
    if ($tab->IsBusy) $tab->WaitDownloading();
    $tab->Navigate("lessons.zennolab.com");
    if ($tab->IsBusy) $tab->WaitDownloading();
    
    // get document
    $doc = $tab->MainDocument;
    
    // if document is null then exit
    if ($doc->IsNull) return -1;
    
    return 0;
}

Requirements

Target Platforms: Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, Windows Vista, Windows Server 2008 family, Windows Seven

Reference

Document Class
Document Members
IsVoid Property