如何在Visual Basic 2008 Express Edition中修复此错误 [英] how to fix this error in visual basic 2008 express edition

问题描述

当我以vb形式放置打印按钮代码时:

When i put the print button code in my vb form:

Private Sub btnPrint_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnPrint.Click
        PrintForm1.PrinterSettings.DefaultPageSettings.Landscape = True
        PrintForm1.Print()

它给我错误:对象变量或With块变量未设置
对于行:PrintForm1.PrinterSettings.DefaultPageSettings.Landscape = True

it gives me the error: Object variable or With block variable not set
for line :PrintForm1.PrinterSettings.DefaultPageSettings.Landscape = True

推荐答案

可能的原因:

-PrintForm1可以为空
-PrintForm1.PrinterSettings可以为空
-PrintForm1.PrinterSettings.DefaultPageSettings可以为空.

请先检查是否为空，然后再继续.

更新1:

在VB中空检查:

Possible reason:

- PrintForm1 could be null
- PrintForm1.PrinterSettings could be null
- PrintForm1.PrinterSettings.DefaultPageSettings could be null.

Please check for null before you proceed.

Update 1:

Null Check in VB:

If PrintForm1 IsNot Nothing Then

'YOUR CODE

End If

尼什的猜想:

PrintForm1为null.

试试，

Nish''s Guess:

PrintForm1 is null.

Try,

PrintForm1 = New PrintForm1
PrintForm1.PrinterSettings.DefaultPageSettings.Landscape = True
PrintForm1.Print()

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