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[英]Why I'm getting exception System.Reflection.TargetInvocationException: 'Exception has been thrown by the target of an invocation.'?
[英]Xamarin Forms System.Reflection.TargetInvocationException: 'Exception has been thrown by the target of an invocation.'
嘿,我是 Xamarin Forms 的新手,不知何故我看不透那個有約束力的東西。
這是我設置 BindingContext 的代碼:
public MainPage()
{
InitializeComponent();
BindingContext = new GameViewModel();
}
這是 ViewModel:
public class GameViewModel
{
private Team Team1 { get; set; }
public Team Team2 { get; set; }
public string Team1Name { get { return Team1.Name; } }
public string StaticString { get { return "static"; } }
}
StaticString 正在工作,綁定 Team1.Name 未顯示任何內容,而 Team1Name 正在引發異常。
這是視圖:
<StackLayout Orientation="Horizontal">
<StackLayout Orientation="Vertical">
<Entry Placeholder="{Binding Team1.Name}" />
<Label Text="Welcome to Xamarin.Forms!" />
</StackLayout>
<StackLayout Orientation="Vertical">
<Entry Placeholder="{Binding Team1Name}" />
<Label Text="Welcome to Xamarin.Forms!" />
</StackLayout>
</StackLayout>
我得到的例外是
System.Reflection.TargetInvocationException: 'Exception has been thrown by the target of an invocation.'
感謝 Jasons 的評論,我發現我忘記初始化 Team 類。 不幸的是,我從 Xamarin 收到的錯誤消息並沒有那么有用。
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