如何在选择相同的东西时防止计算重复？

问题描述

Hello CodeProject社区！

我的代码有问题。

当用户点击ComboBox控件中的相同项目时。

NumericUpDown值将重复计算。

当用户在ComboBox控件中选择相同的项目时，如何阻止计算？



我希望你们都可以帮助我，抱歉我的语法不好。

谢谢你。



我尝试过的事情：



为了更好地了解我当前的问题，下面是我的ComboBox控件代码



私人Sub ComboBox2_SelectedIndexChanged（sender As Object，e As EventArgs）处理ComboBox2.SelectedIndexChanged

'更改速度转换器单元

如果ComboBox2.SelectedItem =KB / s则

NumericUpDown2.DecimalPlaces = 0

NumericUpDown2.Increment = 1

TranferRateSpeedKBs.Enabled = True

TranferRateSpeedMBs.Enabled = False



'我的问题[如果用户在组合框中选择了相同的选项，我想阻止计算]

NumericUpDown2。 Value = NumericUpDown2.Value * 1000



ElseIf ComboBox2.SelectedItem =MB / s然后

NumericUpDown2.DecimalPlaces = 2

NumericUpDown2.Increment = 0.01

TranferRateSpeedKBs.Enabled = False

TranferRateSpeedMBs.Enabled = True



'我的问题[如果用户在组合框中选择了相同的选项，我想阻止计算]

NumericUpDown2.Value = NumericUpDown2.Value / 1000



结束如果

解决方案

Hello CodeProject community!
I have a problem with my codes.
When user clicking the same item from ComboBox control.
The NumericUpDown value will repeat the calculation.
So how do I prevent the calculation when user choose the same item in ComboBox control?

I hope you all can help me and sorry for my bad grammar.
Thank you.

What I have tried:

For more understanding about my current problem, below is my code for the ComboBox control

Private Sub ComboBox2_SelectedIndexChanged(sender As Object, e As EventArgs) Handles ComboBox2.SelectedIndexChanged
'Change speed translator unit
If ComboBox2.SelectedItem = "KB/s" Then
NumericUpDown2.DecimalPlaces = 0
NumericUpDown2.Increment = 1
TranferRateSpeedKBs.Enabled = True
TranferRateSpeedMBs.Enabled = False

'My problem [I want to prevent the calculation if user has selected same option in combobox]
NumericUpDown2.Value = NumericUpDown2.Value * 1000

ElseIf ComboBox2.SelectedItem = "MB/s" Then
NumericUpDown2.DecimalPlaces = 2
NumericUpDown2.Increment = 0.01
TranferRateSpeedKBs.Enabled = False
TranferRateSpeedMBs.Enabled = True

'My problem [I want to prevent the calculation if user has selected same option in combobox]
NumericUpDown2.Value = NumericUpDown2.Value / 1000

End If

解决方案

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