vb中用控制台定义一个限差类TolError,附带事件OverError,限差值设计为属性,由用户输入若干个高差(可正可负),计算其总的高差h,超过限差值则触发事件OverError。
时间: 2024-09-26 16:05:51 浏览: 21
在VB(Visual Basic)中,你可以定义一个名为`TolError`的自定义控件类,用于处理高差限差和超出范围的情况。这个类可能会包含以下几个部分:
1. **类声明**:
```vb
Public Class TolError
' 定义限差值作为公共属性
Public Property LimitDifference As Double
' 初始化时设置默认限差值
Public Sub New(limitDiff As Double)
LimitDifference = limitDiff
End Sub
' 事件声明,当高差超过限差值时触发
Public Event OverError(highDifference As Double)
End Class
```
2. **计算总高差和处理事件**:
```vb
Private Function CalculateTotalHeight(heights() As Double) As Double
Dim totalHeight As Double = 0
For Each height In heights
totalHeight += height
If totalHeight > LimitDifference Then
RaiseEvent OverError(totalHeight - LimitDifference) ' 触发事件
End If
Next
Return totalHeight
End Function
```
3. **用户输入和实例化**:
```vb
Sub UserInput()
' 用户输入高差数组
Dim userHeights(5) As Double
' 获取并验证用户输入
Console.WriteLine("请输入高差数值(按Enter结束):")
For i = 0 To 5
Dim input As String
Console.Write(i & ". ")
Do While Not IsNumeric(input)
Console.Write("无效输入,请输入数字: ")
input = Console.ReadLine()
Loop
userHeights(i) = CDbl(input)
Next
' 创建TolError对象并计算总高差
Dim tolErr As New TolError(10) ' 示例限差值为10
Dim totalHeight As Double = tolErr.CalculateTotalHeight(userHeights)
Console.WriteLine($"总高差为{totalHeight}.")
End Sub
```