创建一个使用ColorDialog 对话框的应用程序。将应用程序主窗体的背景颜色设置为ColorDialog 返回的颜色。返回的颜色被存储在Color属性中。提示：创建一个ColorDialog变量，调用该对话框时，选择的颜色应该存储在Color属性中。-Create a to ColorDialog dialog application. The application' s main form background color settings color ColorDialog return. The color returned is stored in the Color property. Tip: Create a a ColorDialog variable, call the dialog box, select the color should be stored in the Color property.