Question

我一直在按照教程创建一个在C＃/ Windows手机中工作的MVVM原型。这是我的主要。但我得到的错误是ExampleMvvmPhone.ViewModel是namespace但是像type一样使用。请在这里帮助我。谢谢

namespace ExampleMvvmPhone
{ 
    public partial class MainPage : PhoneApplicationPage
    {
        public MainPage()
        {
            InitializeComponent();
            ViewModel viewModel = new ViewModel();
            this.DataContext = viewModel;
        }
    }
}

我的xaml

<TextBox x:Name="txtFirstName" Grid.Column="2"  Grid.Row="2" Margin="0,0,0,5" FontSize="24" Text="{Binding Current.FirstName, Mode=TwoWay}"/>
<TextBox x:Name="txtLastName" Grid.Column="2"  Grid.Row="3" Margin="0,0,0,5" FontSize="24" Text="{Binding Current.LastName, Mode=TwoWay}"/>
<TextBox x:Name="txtEmail" Grid.Column="2"  Grid.Row="4"  Margin="0,0,0,5" FontSize="24" Text="{Binding Current.Email, Mode=TwoWay}"/>
<TextBox x:Name="txtPhone" Grid.Column="2"  Grid.Row="5"  Margin="0,0,0,5" FontSize="24" Text="{Binding Current.Phone, Mode=TwoWay}"/>

我的ViewModel类：

    namespace ExampleMvvmPhone.ViewModel
    {
    public class ViewModel
    {
        private List<Customer> customers;
        private int currentCustomer;

        //constructor
        public ViewModel()
        {
            this.currentCustomer = 0;
            this.customers = new List<Customer>
            {
               new Customer
               {
                   CustomerID = 1,
                   Title = "Mr",
                   FirstName = "Mwangi",
                   LastName = "Austin",
                   Email = "mwangi@gmail.com",
                   Phone = "0728704660"
               },
               new Customer
               {
                   CustomerID = 2,
                   Title = "Mrs",
                   FirstName = "Christine",
                   LastName = "Nekunda",
                   Email = "mwangi@gmail.com",
                   Phone = "0728704660"
               },
               new Customer
               {
                   CustomerID = 3,
                   Title = "Ms",
                   FirstName = "Catherine",
                   LastName = "Nakutenga",
                   Email = "mwangi@gmail.com",
                   Phone = "0728704660"
               }
            };
        }

        public Customer Current
        {
            get
            {
                return this.customers[currentCustomer];
            }
        }
    }
}

Answer 1

问题出在这一行：

ViewModel viewModel = new ViewModel();

由于您位于不同的命名空间中，您应该包含使用using定义的命名空间ViewModel：

using ExampleMvvmPhone.ViewModel;
namespace ExampleMvvmPhone
{
...

或使用将其添加到类名：

ViewModel.ViewModel viewModel = new ViewModel.ViewModel();

Answer 2

似乎错误告诉您确切的问题是什么：

'ExampleMvvmPhone.ViewModel'是'命名空间'，但用作“类型”

如果您查看代码，那么您将看到将您的命名空间和类名命名为ViewModel。改变这个：

namespace ExampleMvvmPhone.ViewModel
{
    public class ViewModel
    {        ...

到此：

namespace ExampleMvvmPhone
{
    public class ViewModel
    {
        ...

Answer 3

在您的ViewModel课程中，将您的名称空间namespace ExampleMvvmPhone.ViewModel更改为namespace ExampleMvvmPhone。因为如果对namespace ExampleMvvmPhone.ViewModel类使用ViewModel，那么编译器就会感到困惑，ViewModel是class还是namespace。

由于

'ExampleMvvmPhone.ViewModel'是'命名空间'，但用作“类型”

3 个答案: