我想在调用函数返回错误时控制错误消息 [英] i want to control the error message when calling function return an error

问题描述

在调用函数时发生错误时，我想自定义自己的错误框和消息。

i want to customize my own error box and message when an error occur in calling a function .

在此处输入图片描述

我尝试使用try catch异常，但不执行任何操作

i try to use try catch an exception but not doing anything

    Try
            L = objGeoFlowDLL.GFCalc_Main(nInputs, nOutputs, sngInputs, sngOutputs)

        Catch ex As Exception
            MessageBox.Show(ex.Message)
            '  Me.Close()
        Finally

        End Try

推荐答案

Try
  L = objGeoFlowDLL.GFCalc_Main(nInputs, nOutputs, sngInputs, sngOutputs)
Catch ex As DivideByZeroException
  MessageBox.Show("Custom message to be shown when something is divided by zero.")
Catch ex2 As Exception
  MessageBox.Show("Custom message to be shown when any other error occurs.")
End Try

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