[英]ASP.NET Pass Error Messages
This is probably going to end up as a stupid question, but countless research has offered me no results. 这可能最终会成为一个愚蠢的问题,但是无数的研究没有给我任何结果。
I know there are different types of errors I want to check for, and when I should be throwing an exception for "exceptional" errors, and that I should create validating functions for input and other checks. 我知道我要检查的错误类型不同,何时应该为“异常”错误引发异常,并且应该为输入和其他检查创建验证函数。
My problem is, how do I send an error back to a page when the data entered fails in a separate class? 我的问题是,当输入的数据在单独的类中失败时,如何将错误发送回页面?
For Example: 例如:
I can do it on inline page, no problem, its passing it through a separate class that's causing me issues... Maybe I'm not even thinking of this correctly. 我可以在内联页面上完成它,没问题,将它传递给一个单独的类,这会引起我的问题……也许我什至没有正确地考虑这一点。
Any points in the right direction would be of huge help. 朝正确方向的任何观点都会有很大帮助。
Thanks for the help in advance. 我在这里先向您的帮助表示感谢。
The simplest solution is to have Submit() return a boolean indicating whether there was an error or not: 最简单的解决方案是让Submit()返回一个布尔值,该布尔值指示是否存在错误:
If class.Submit() = False Then
lblError.Text = "Hey, that is not right."
End If
It is a good practice to put your class in charge of its own errors, in which case you would expose an error message property: 最好让类负责自己的错误,在这种情况下,您将公开错误消息属性:
If class.Submit() = False Then
lblError.Text = class.GetErrorMessage()
End If
The Submit function would look something like this: Submit函数将如下所示:
Public Function Submit() As Boolean
Dim success As Boolean = False
Try
' Do processing here. Depending on what you do, you can
' set success to True or False and set the ErrorMessage property to
' the correct string.
Catch ex As Exception
' Check for specific exceptions that indicate an error. In those
' cases, set success to False. Otherwise, rethrow the error and let
' a higher up error handler deal with it.
End Try
Return success
End Function
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