小编Fra*_*gg7的帖子

我想在做一些异步操作后将焦点设置在一个SearchBox控件中,我想从我的ViewModel中做到这一点.

我怎么能这样做？

编辑

ViewModel代码:

    private bool _searchBarFocused;

    public bool SearchBarFocused
    {
        get { return _searchBarFocused; }
        set
        {
            _searchBarFocused = value;
            base.OnPropertyChanged("SearchBarFocused");
        }
    }

    public async Task InitializeData()
    {
        // Other operations...

        SearchBarFocused = true;
    }

查看代码隐藏代码:

    protected override void OnAppearing()
    {
        base.OnAppearing();
        (this.BindingContext as MyViewModel).InitializeData();
    }

SearchBar XAML代码:

  <SearchBar SearchCommand="{Binding SearchItemsCommand}">
    <SearchBar.Triggers>
      <DataTrigger TargetType="SearchBar"
                   Binding="{Binding SearchBarFocused, Mode=TwoWay}" Value="True">
        <Trigger.EnterActions>
          <triggers:SearchBarFocusTriggerAction Focused="True" />
        </Trigger.EnterActions>

        <Trigger.ExitActions>
          <triggers:SearchBarFocusTriggerAction Focused="False" />
        </Trigger.ExitActions>
      </DataTrigger>
    </SearchBar.Triggers>
  </SearchBar> …

我正在使用ASP.NET MVC5和Identity 2.0(beta).

用户可以更改用户名吗？

我正在尝试使用UserManager.UpdateAsync方法抛出异常.

Regrads,

弗兰.

我正在尝试实现密码重置功能。我使用 ASP.NET 身份。

我正在使用UserManager.GetConfirmationToken返回这样的令牌：

UW/cj4xUj08kiGCntnWs7z1eUcWlyfNczH5IZfvf0ScTi4L1jgdkkus/Zb5ROJOWb%2b1XAVRSiBUvVGnESfEyauDDa4u%2bPDUH6D/CIpwPcFYRvLi%2b%2bq6f%2bRIhKHRTsGMV0y8lXpSZ5V qySWGSSaW9kofGage/IjW4HrvONeETA4Szov3u7HgmqEUf0yzgivJ0

然后，我编写 URL 并通过电子邮件将其发送给注册用户。激活账户的url是这样的：

http://localhost:4322/Account/Confirm/UW/cj4xUj08kiGCntnWs7z1eUcWlyfNczH5IZfvf0ScTi4L1jgdkkus/Zb5ROJOWb%2b1XAVRSiBUvVGnESfEyauDDa4u%2bPDUH6D/CIpwPcFYRvLi%2b%2bq6f%2bRIhKHRTsGMV0y8lXpSZ5VqySWGSSaW9kofGage/IjW4HrvONeEtA4Szov3u7HgmqEUf0yzgivJ0

当我点击时，出现这个错误：
Error HTTP 404.11 - Double escape sequence issue

当我在Release中构建我的Xamarin.Android应用程序时出现以下错误.

"Java.exe" exited with code 1

这是输出......

...    
1> java.io.IOException: Can't read [C:\Users\FranciscoJavier\AppData\Local\Android\android-sdk\platforms\android-24\android.jar] (Can't process class [java/nio/charset/CharsetDecoder.class] (Unsupported class version number [52.0] (maximum 51.0, Java 1.7)))
1> at proguard.InputReader.readInput(InputReader.java:230)
1> at proguard.InputReader.readInput(InputReader.java:200)
1> at proguard.InputReader.readInput(InputReader.java:178)
1> at proguard.InputReader.execute(InputReader.java:100)
1> at proguard.ProGuard.readInput(ProGuard.java:196)
1> at proguard.ProGuard.execute(ProGuard.java:78)
1> at proguard.ProGuard.main(ProGuard.java:492)
1> Caused by: java.io.IOException: Can't process class [java/nio/charset/CharsetDecoder.class] (Unsupported class version number [52.0] (maximum 51.0, Java 1.7))
1> at proguard.io.ClassReader.read(ClassReader.java:112)
1> at proguard.io.FilteredDataEntryReader.read(FilteredDataEntryReader.java:87)
1> at proguard.io.JarReader.read(JarReader.java:65)
1> at proguard.io.DirectoryPump.readFiles(DirectoryPump.java:65)
1> at proguard.io.DirectoryPump.pumpDataEntries(DirectoryPump.java:53)
1> …

我想尽可能遵循MVVM模式，但我不知道我的导航是否做得很好。请注意，我正在使用 MasterDetail 页面，并且我想维护 Master 页面，在导航时仅更改 Detail 侧。

public class ViewModelOne : ViewModelBase
{
    private void GoToViewTwo()
    {
        var viewTwo = new ViewTwo(new ViewModelTwo());
        ((MasterView)Application.Current.MainPage).NavigateToPage(viewTwo);
    }
}

public class MasterView : MasterDetailPage
{
    public void NavigateToPage(Page page)
    {
        Detail = new NavigationPage(page);
        IsPresented = false;
    }
}

public partial class ViewTwo : PageBase
{
    public MenuView(ViewModelTwo vm)
        : base(vm)
    {
        InitializeComponent();
    }
}

public class PageBase …