PrinterSettings.IsDefaultPrinter 属性
定义
重要
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获取一个值，该值指示 PrinterName 属性是否指定默认打印机（用户显式设置 PrinterName 的情况除外）。
public:
property bool IsDefaultPrinter { bool get(); };public bool IsDefaultPrinter { get; }member this.IsDefaultPrinter : boolPublic ReadOnly Property IsDefaultPrinter As Boolean属性值
若 PrinterName 指定默认打印机，则为 true；否则为 false。
示例
以下示例演示如何使用 IsDefaultPrinter 属性。 若要运行此示例，请将以下代码粘贴到窗体中，并从窗体的构造函数或Load事件处理方法调用 PopulateInstalledPrintersCombo 。
private ComboBox comboInstalledPrinters = new ComboBox();
private PrintDocument printDoc = new PrintDocument();
private void PopulateInstalledPrintersCombo()
{
comboInstalledPrinters.Dock = DockStyle.Top;
Controls.Add(comboInstalledPrinters);
// Add list of installed printers found to the combo box.
// The pkInstalledPrinters string will be used to provide the display string.
int i;
string pkInstalledPrinters;
for (i = 0; i < PrinterSettings.InstalledPrinters.Count; i++)
{
pkInstalledPrinters = PrinterSettings.InstalledPrinters[i];
comboInstalledPrinters.Items.Add(pkInstalledPrinters);
if (printDoc.PrinterSettings.IsDefaultPrinter)
{
comboInstalledPrinters.Text = printDoc.PrinterSettings.PrinterName;
}
}
}
Private WithEvents comboInstalledPrinters As New ComboBox
Private WithEvents printDoc As New PrintDocument
Private Sub PopulateInstalledPrintersCombo()
comboInstalledPrinters.Dock = DockStyle.Top
Controls.Add(comboInstalledPrinters)
' Add list of installed printers found to the combo box.
' The pkInstalledPrinters string will be used to provide the display string.
Dim i As Integer
Dim pkInstalledPrinters As String
For i = 0 To PrinterSettings.InstalledPrinters.Count - 1
pkInstalledPrinters = PrinterSettings.InstalledPrinters.Item(i)
comboInstalledPrinters.Items.Add(pkInstalledPrinters)
If (printDoc.PrinterSettings.IsDefaultPrinter()) Then
comboInstalledPrinters.Text = printDoc.PrinterSettings.PrinterName
End If
Next
End Sub
注解
IsDefaultPrinter当将 属性显式设置为 PrinterName 字符串值而不是 null时，始终返回 false 。
