为什么Me.components什么都没有？ [英] Why is Me.components Nothing?

问题描述

我写了一个自定义的ErrorProvider，它为现有的ErrorProvider添加了一些功能（设置了控件BackColor，ErrorCount等）。可以正常工作，但是由于某种原因，它落在了构造函数上：

I have written a custom ErrorProvider which adds some functionality to the existing ErrorProvider (sets control BackColor, ErrorCount etc). This was working find but now for some reason it falls over on the constructor:

_LoginErrorProvider = New ErrorLogErrorProvider(Me.components)

错误是NullReferenceException，它是由Me.components为Nothing引起的。谁能阐明为什么表单的组件集合什么都没有？

The error is a NullReferenceException which is caused by the fact that Me.components is Nothing. Can anyone shed any light on why a form's components collection would be Nothing? The form seems to work fine in every other way!

推荐答案

将表单添加到设计图面时，它会将其添加到表单中。 InitializeComponent函数

when you add a component to the design surface it adds this in the InitializeComponent function

me.components = new System.ComponentModel.Container()

所以只需在自己中添加即可。

so just add this in your self.

或您的

_LoginErrorProvider = New ErrorLogErrorProvider(Me.components)

在InitializeComponent之前被调用

is being called before InitializeComponent

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