我想知道你能不能帮助我？我的问题是，如果您在文本框中输入数字/小数并单击一个按钮，然后更新要更改的设置，然后在另一个链接的链接中进行更改，是否可以更改表单中my.Settings的值到my.Settings中的变量？
表格1：
公共类frmConverter
Dim input As String
Dim result As Decimal
Dim EUR_Rate As Decimal = My.Settings.EUR_Rates
Dim USD_Rate As Decimal = 1.6
Dim JYP_Rate As Decimal = 179.65
Private Sub btnCalc_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalc.Click
input = txtInput.Text
Try
If ComboBox1.Text = "£" Then
Pounds()
ElseIf ComboBox1.Text = "€" Then
Euros()
ElseIf ComboBox1.Text = "$" Then
Dollars()
ElseIf ComboBox1.Text = "¥" Then
Yen()
End If
Catch es As Exception
MsgBox("Error!")
End Try
End Sub
Private Sub btnSettings_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSettings.Click
Me.Hide()
frmExchange.Show()
End Sub
Private Sub btnReset_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnReset.Click
txtInput.Text = ""
lblResult.Text = ""
End Sub
Function Pounds()
If ComboBox1.Text = "£" And ComboBox2.Text = "€" Then
result = (input * EUR_Rate)
lblResult.Text = FormatNumber(result, 2) & " " & ComboBox2.Text
ElseIf ComboBox1.Text = "£" And ComboBox2.Text = "$" Then
result = (input * USD_Rate)
lblResult.Text = FormatNumber(result, 2) & " " & ComboBox2.Text
ElseIf ComboBox1.Text = "£" And ComboBox2.Text = "¥" Then
result = (input * JYP_Rate)
lblResult.Text = FormatNumber(result, 2) & " " & ComboBox2.Text
End If
Return 0
End Function
表格2：公共类frmExchange
Private Sub frmExchange_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
My.Settings.EUR_Rates = (txtinput.Text)
My.Settings.Save()
My.Settings.Reload()
End Sub
Public Sub SetNewRate(ByVal rate As Decimal)
txtinput.Text = rate.ToString
End Sub
Private Sub btnchange_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnchange.Click
If ComboBox1.Text = "€" Then
My.Settings.USD_Rates = (txtinput.Text)
frmConverter.SetNewRate(txtinput.Text)
End If
End Sub
结束班
听起来您正在尝试将其My.Settings用作某种类型的全局参考变量集。那不是他们的目的，不是他们的工作方式，也不是他们的目的。
首先，打开Option Strict，因为它看起来像是Off。这会将文本框的十进制值存储到设置为Decimal的Settings变量中：
My.Settings.USD_Rates = CDec(SomeTextBox.Text)
就是这样。它不会保存值，也不会传递它或与其他形式和变量共享它。
My.Settings.Save 'saves current settings to disk for next time
My.Settings.Reload 'Load settings from last time
这在MSDN上都有介绍。任何地方都没有链接。如果您具有其他形式的代码，例如：
txtRate.Text = My.Settings.USD_Rates.ToString
txtRate当您向“设置”中发布新值时，将不会自动更新。只有值而不是对象（请参阅值类型和引用类型）。要将新值传递给另一种形式：
' in other form:
Public Sub SetNewRate(rate As Decimal)
' use the new value:
soemTextBox.Text = rate.ToString
End Sub
以获取更改的形式：
Private Sub btnchangeRate(....
' save to settings which has nothing to do with passing the data
My.Settings.USD_Rates = CDec(RateTextBox.Text)
otherForm.SetNewRate(CDec(RateTextBox.Text))
End Sub
如果使用默认表单实例，则可能会遇到问题，但这是另一个问题。
您把指示弄糊涂了。这两个过程应该采用两种不同的形式-一种发送新值，一种接收新值。通过编辑和更完整的图片，可以找到更简单的方法。
Private Sub btnSettings_Click(...) Handles btnSettings.Click
' rather than EMULATE a dialog, lets DO a dialog:
'Me.Hide()
'frmExchange.Show()
Using frm As New frmExchange ' the proper way to use a form
frm.ShowDialog
' Im guessing 'result' is the xchg rate var
result = CDec(frm.txtInput.Text)
End Using ' dispose of form, release resources
End Sub
在另一种形式
Private Sub btnchange_Click(....)
' do the normal stuff with Settings, if needed then:
Me.Hide
End Sub
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