问题描述
我正在尝试在我的简单应用程序中更改网格的背景颜色(名称为colorPlace")(当我单击按钮时).我试过(红色、绿色和蓝色是字节):
I am trying to change background color of grid (with name "colorPlace") in my simple app (when I click on button). I tried (where red, green and blue are bytes):
colorPlace.Background = new SolidColorBrush(Color.FromArgb(255, red, green, blue));
和:
colorPlace.SetValue(BackgroundProperty, "#FFFFFFFF");
而我得到的只是:
An exception of type 'System.NullReferenceException' occurred in Project.DLL but was not handled in user code
有什么办法吗?
哦，我刚刚找到了一个解决方案 - 元素(网格、按钮等)的所有更改都应该在 InitializeComponent(); 行之后完成.p>
Oh, I just find an solution - all changes in elements (grid, buttons etc.) should be done AFTER InitializeComponent(); line.
推荐答案
一切看起来都不错.项目本身有问题..看起来 colorPlace 在运行时为空.或者您正在尝试在 InitializeComponent 调用之前设置背景.
Everything looks good. Something wrong with the project itself.. it looks like that the colorPlace is null at the runtime. or you are trying to set the background before the InitializeComponent call.
public MainPage()
{
colorPlace.Background = new SolidColorBrush(Color.FromArgb(255, 100, 100, 100));
InitializeComponent();
}
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