背景

机房收费系统里面有个基本数据设定的功能，我有个想法，就是如果我没有修改基本数据然后点击更新，希望系统能识别出来，并且告诉我。

基本思路

在外观层，用一个实体类对象保存从数据库查询出来的当前基本数据，然后U层的数据也组装成一个实体类保存U层的基本数据设定。然后比较这两个实体类的属性是不是完全相同。

关键代码

    Public Sub UpdateBasicData(enBasicData As Entity.BasicDataEntity)
        Dim i As Integer
        Dim oldValue As String
        Dim newValue As String
        Dim pi As System.Reflection.PropertyInfo
        Dim mpi() As System.Reflection.PropertyInfo

        mpi = GetType(Entity.BasicDataEntity).GetProperties()

        For i = 0 To mpi.Length - 3
            pi = mpi(i)

            oldValue = pi.GetValue(NewBasicDataEntity, Nothing).ToString()
            newValue = pi.GetValue(enBasicData, Nothing).ToString()

            If oldValue <> newValue Then
                Exit For
            End If
        Next

        If i = mpi.Length - 2 Then
            Throw New BasicDataNotEdit
        End If
        BasicDataBLL.EditBasicData(enBasicData)
    End Sub

参考资料

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