Caliburn.Micro 的保护子句出错
我正在尝试使用 Caliburn.Micro 实现如此保护处理，但在应用程序运行时出现无效的强制转换异常。
属性：
public Account UserAccount
{
get
{
return account;
}
set
{
account = value;
NotifyOfPropertyChange(() => UserAccount);
NotifyOfPropertyChange(() => CanSaveAndNavigateToComposeView());
}
}
方法：
public void SaveAndNavigateToComposeView()
{
CommitAccountToStorage();
navigationService.UriFor<ComposeViewModel>().Navigate();
}
守卫：
public bool CanSaveAndNavigateToComposeView()
{
return !(string.IsNullOrEmpty(UserAccount.DisplayName) ||
string.IsNullOrEmpty(UserAccount.Username) ||
string.IsNullOrEmpty(UserAccount.Password) ||
string.IsNullOrEmpty(UserAccount.ServerSymbol));
}
如果我取出属性上的通知属性更改，守卫就会起作用，但这意味着我的方法永远不会评估。
I am trying to implement so guard handling with Caliburn.Micro but I am getting an invalid cast exception when the application runs.
The Property:
public Account UserAccount
{
get
{
return account;
}
set
{
account = value;
NotifyOfPropertyChange(() => UserAccount);
NotifyOfPropertyChange(() => CanSaveAndNavigateToComposeView());
}
}
The Method:
public void SaveAndNavigateToComposeView()
{
CommitAccountToStorage();
navigationService.UriFor<ComposeViewModel>().Navigate();
}
The Guard:
public bool CanSaveAndNavigateToComposeView()
{
return !(string.IsNullOrEmpty(UserAccount.DisplayName) ||
string.IsNullOrEmpty(UserAccount.Username) ||
string.IsNullOrEmpty(UserAccount.Password) ||
string.IsNullOrEmpty(UserAccount.ServerSymbol));
}
The guard works if I take out the notify prop change on the property but this means my method would never evaluate.
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评论（1）
您需要将 CanSaveAndNavigateToComposeView 设为属性而不是方法。
You need to make CanSaveAndNavigateToComposeView into a property rather than a method.