从'对象到'字符串'在行“readValue = My.Computer.Registry.GetValue(" HKEY_LOCAL_MACHINE \ SOFTWARE \ARSS"," EPV",Nothing)”的隐式转换“ [英] Implicit converstion from 'object to 'string' at line "readValue = My.Computer.Registry.GetValue("HKEY_LOCAL_MACHINE\SOFTWARE\ARSS", "EPV", Nothing)"

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本文介绍了从'对象到'字符串'在行“readValue = My.Computer.Registry.GetValue(" HKEY_LOCAL_MACHINE \ SOFTWARE \ARSS"," EPV",Nothing)”的隐式转换“的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

 私有  Sub  PictureBox7_Click( ByVal  sender  As  System。 Object  ByVal  e  As  System.EventArgs) Handles  PictureBox7.Click 
PictureBox7 .Hide()
PictureBox6.Hide()
PictureBox5.Show()
Dim readValue 作为 字符串
readValue = My.Computer.Registry.GetValue( HKEY_LOCAL_MACHINE \ SOFTWARE \ARSS EPV Nothing
如果 readValue< ;> 然后
Button1 .Hide()
ConfigurationMain.TabPages.Remove(TabPage2)
ConfigurationMain.TabPages.Remove(TabPage4)
Savemain.Hide()
Label23.Hide()
Login.Show()
Else
Button1.Show()
ConfigurationMain.TabPages.Remove(TabPage2)
ConfigurationMain .TabPages.Remove(TabPage4)
Login.Hide()
Savemain.Show()
Label23.Hide()
Timer1.Interval = 100
Timer1.Enabled = True
结束 < span class =code-keyword>如果
结束 Sub

解决方案

做类似的事情:



  Dim  readValue  As   String  
readValue = CStr (My.Computer.Registry.GetValue( HKEY_LOCAL_MACHINE\SOFTWARE\ARSS EPV Nothing ))

如果 String .IsNullOrEmpty(readValue)然后
' ....
结束 如果







一条建议,将项目选项'strict'设置为'on - 那么你应该在编译时得到一个错误

Private Sub PictureBox7_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles PictureBox7.Click
        PictureBox7.Hide()
        PictureBox6.Hide()
        PictureBox5.Show()
        Dim readValue As String
        readValue = My.Computer.Registry.GetValue("HKEY_LOCAL_MACHINE\SOFTWARE\ARSS", "EPV", Nothing)
        If readValue <> "" Then
            Button1.Hide()
            ConfigurationMain.TabPages.Remove(TabPage2)
            ConfigurationMain.TabPages.Remove(TabPage4)
            Savemain.Hide()
            Label23.Hide()
            Login.Show()
        Else
            Button1.Show()
            ConfigurationMain.TabPages.Remove(TabPage2)
            ConfigurationMain.TabPages.Remove(TabPage4)
            Login.Hide()
            Savemain.Show()
            Label23.Hide()
            Timer1.Interval = 100
            Timer1.Enabled = True
        End If
    End Sub

解决方案

Hi, make something like that:

Dim readValue As String
readValue = CStr(My.Computer.Registry.GetValue("HKEY_LOCAL_MACHINE\SOFTWARE\ARSS", "EPV", Nothing))

If Not String.IsNullOrEmpty(readValue) Then
    '....
End If




And one advice, set the project option 'strict' to 'on' - then you should get an error at compile time.


这篇关于从'对象到'字符串'在行“readValue = My.Computer.Registry.GetValue(&quot; HKEY_LOCAL_MACHINE \ SOFTWARE \ARSS&quot;,&quot; EPV&quot;,Nothing)”的隐式转换“的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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