【发布时间】：2016-11-04 10:32:48
【问题描述】：
下面是使用 MVVM 概念开发简单 UWP 项目的代码。我正在努力解决 Locator 类中的 AddEngineerviewmodel 静态属性引发的 System.TypeInitializationException。
指向 View.xaml 中 DataContext 行的内部异常：
找不到具有名称/主要密钥 [行：10 位置：5]"} 的资源 ..
型号：
public class AddEngineerModel : BindableBase
{
private string _engrName;
public string EngrName
{
get { return _engrName; }
set
{
_engrName = value;
RaisePropertyChanged("EngrName");
}
}
private string _phoneNo;
public string PhoneNo
{
get { return _phoneNo; }
set
{
_phoneNo = value;
RaisePropertyChanged("PhoneNo");
}
}
private string _email;
public string Email
{
get { return _email; }
set
{
_email = value;
RaisePropertyChanged("Email");
}
}
private string _address;
public string Address
{
get { return _address; }
set
{
_address = value;
RaisePropertyChanged("Address");
}
}
private int _salary;
public int Salary
{
get { return _salary; }
set
{
_salary = value;
RaisePropertyChanged("Salary");
}
}
}
视图模型：
public class AddEngineerViewModel:BindableBase
{
#region Constructor
public AddEngineerViewModel(IAddEngineerDataService _engineerDataService, IDialogServices _dialog)
{
_engineerDataService = new AddEngineerDataServices(new AddEngineerData());
_dialog = new DialogServices();
LoadCommand();
}
#endregion
#region Fields
private static IAddEngineerDataService _engineerDataService;
private static IDialogServices _dialog;
private string _engrName;
public string EngrName
{
get { return _engrName; }
set
{
_engrName = value;
RaisePropertyChanged("EngrName");
}
}
private string _phoneNo;
public string PhoneNo
{
get { return _phoneNo; }
set
{
_phoneNo = value;
RaisePropertyChanged("PhoneNo");
}
}
private string _email;
public string Email
{
get { return _email; }
set
{
_email = value;
RaisePropertyChanged("Email");
}
}
private string _address;
public string Address
{
get { return _address; }
set
{
_address = value;
RaisePropertyChanged("Address");
}
}
private int _salary;
public int Salary
{
get { return _salary; }
set
{
_salary = value;
RaisePropertyChanged("Salary");
}
}
#endregion
#region Methods
#region Command
public ICommand AddEngineerCommand { get; set; }
public ICommand ViewEmployeeCommand { get; set; }
private void LoadCommand()
{
AddEngineerCommand = new CustomCommand(Add, CanAdd);
ViewEmployeeCommand = new CustomCommand(Views, CanView);
}
private void Views(object obj)
{
_dialog.ShowDialog();
}
private bool CanView(object obj)
{
return true;
}
private bool CanAdd(object obj)
{
return true;
}
private void Add(object obj)
{
_engineerDataService.Add_Engineer_Details(new AddEngineerModel { EngrName=_engrName,Email=_email,PhoneNo=_phoneNo,Address=_address,Salary=_salary });
}
#endregion
#endregion
}
定位器：
public class Locator
{
private static IDialogServices Dialog = new DialogServices();
private static IAddEngineerDataService EngineerService = new AddEngineerDataServices(new AddEngineerData());
private static ISupervisorDataServices SupervisorService = new SupervisorDataServices(new SupervisorData());
private static AddEngineerViewModel _engineerViewModel = new AddEngineerViewModel(EngineerService, Dialog);
public static AddEngineerViewModel EngineerViewModel
{
get { return _engineerViewModel; }
}
}
app.xaml
<Application.Resources>
<locator:Locator x:Key="loc"/>
</Application.Resources>
View.xaml
<Page
Datacontext={Binding Source={StaticResources loc},Path=EngineerViewModel}/>
【问题讨论】：
-
点击“查看详情”查看内部异常。这通常可以很好地提示问题所在。
-
哇，一张异常的照片。那没有帮助。但是，如果您查看图片，上面有一个链接，上面写着“将异常详细信息复制到剪贴板”。现在，如果您单击该链接，然后单击 edit 链接，然后将图片替换为剪贴板中的文本，那将非常有帮助。
-
您是否使用了第三方包？棱镜还是 Mvvmlight？
-
不，我没有使用第三方软件包（Prism 或 Mvvmlight）@Sunteen。为什么 Sunteen 那个包对我有帮助？