wpf中的System.Visibility问题 [英] System.Visibility Problem in wpf

问题描述

public Screen2 MyScreen2{ get; set; }
private void Button_Click(object sender, RoutedEventArgs e)
      {
            this.Visibility = System.Windows.Visibility.Collapsed;

            
                this.MyScreen2.Visibility = System.Windows.Visibility.Visible;
            
        }

i尝试这个，显示'System.NullReferenceException' => 对象引用没有设置为对象的实例。

这里MyScreen2显示为null，

给出一些想法如何解决它，提前谢谢

i try this, shows an 'System.NullReferenceException' => "Object reference not set to an instance of an object".
Here MyScreen2 shows null,
Give some idea's how to resolve it, thanks in advance

推荐答案

您正在尝试使用null的东西。这意味着您要么将其设置为null，要么从未初始化它。



我建议您逐步执行代码并找到null对象。

您应该检查 MyScreen2 对象。

- Amy

You are trying to use something that is null. This means you either set it to null, or you never initialized it.

I would suggest you to step through the code and find the null object.
You should check your MyScreen2 object.

--Amy

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