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C＃说this.Controls为null，为什么呢？

[英]C# says this.Controls is null, why?

原文 2010-04-21 09:07:12 0 3 c#/ .net/ user-interface/ designer/ nullreferenceexception

Earlier my code was running nicely.. then I edited some .. did not touch the designer code. 早些时候我的代码运行得很好..然后我编辑了一些..没有碰到设计器代码。

alt text http://img718.imageshack.us/img718/3759/errorstack.jpg 替代文字http://img718.imageshack.us/img718/3759/errorstack.jpg

Why this error is being shown? 为什么显示此错误？

3 个解决方案

如果这是Windows窗体-您是否从窗体的构造函数中删除了InitializeComponent（）行？

Maybe its the label is Null and that's causing the trouble. 也许它的标签是Null，这会引起麻烦。 I'm not that experienced with C# but it could be the case that Controls doesn't except a Null-Pointer. 我对C＃并没有那么丰富的经验，但是控件可能只是Null指针而已。

Looks like, at this point in code label1 is not yet initialized. 看起来，此时代码label1尚未初始化。 Whic event handler are you coding this in ? 您在其中使用哪个事件处理程序进行编码？ Make sure controls are initialized before using them. 使用控件之前，请确保控件已初始化。 Make sure you are using the controls after InitComplete event. 确保在InitComplete事件之后使用控件。

this.Controls返回null - this.Controls returns null

如何在WPF中使用foreach（this.Controls中的控件c） - How to use foreach (Control c in this.Controls) in WPF

this.Controls不包含所有控件 - this.Controls doesn't contain all controls

从 this.Controls 中删除的标签不断重新出现 - Labels removed from this.Controls keep reappearing

用XmlNodeList填充“ this.Controls [controlName]”组合框 - Populate a “this.Controls[controlName]” comboBox with XmlNodeList

为什么在循环内更改 child.Parent 属性时，foreach over this.Controls 集合无法正常工作 - Why foreach over this.Controls collection does not work correctly when child.Parent property changed inside the loop

SOAP返回数据，但C＃表示null响应 - SOAP returns data, but C# says null response

为什么flowlayoutpanel控件计数为0 C＃ - Why flowlayoutpanel controls count 0 C#

为什么有时在C＃的FlowLayoutPanels中忽略控件？ - Why are controls sometimes ignored in FlowLayoutPanels in C#?

找不到 this.Controls - 我错过了什么？ - Can't find this.Controls - what am I missing?

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相关问题 this.Controls返回null - this.Controls returns null 如何在WPF中使用foreach（this.Controls中的控件c） - How to use foreach (Control c in this.Controls) in WPF this.Controls不包含所有控件 - this.Controls doesn't contain all controls 从 this.Controls 中删除的标签不断重新出现 - Labels removed from this.Controls keep reappearing 用XmlNodeList填充“ this.Controls [controlName]”组合框 - Populate a “this.Controls[controlName]” comboBox with XmlNodeList 为什么在循环内更改 child.Parent 属性时，foreach over this.Controls 集合无法正常工作 - Why foreach over this.Controls collection does not work correctly when child.Parent property changed inside the loop SOAP返回数据，但C＃表示null响应 - SOAP returns data, but C# says null response 为什么flowlayoutpanel控件计数为0 C＃ - Why flowlayoutpanel controls count 0 C# 为什么有时在C＃的FlowLayoutPanels中忽略控件？ - Why are controls sometimes ignored in FlowLayoutPanels in C#? 找不到 this.Controls - 我错过了什么？ - Can't find this.Controls - what am I missing?

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