Question

我用Xamarin形式创建了MasterDetailPage但是当我试图运行应用程序时它给了我上面的错误。下面是我的MasterDetailPage的Xaml代码

R version 3.3.1 (2016-06-21)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 16.04.1 LTS

locale:
 [1] LC_CTYPE=pl_PL.UTF-8       LC_NUMERIC=C               LC_TIME=pl_PL.UTF-8        LC_COLLATE=pl_PL.UTF-8    
 [5] LC_MONETARY=pl_PL.UTF-8    LC_MESSAGES=pl_PL.UTF-8    LC_PAPER=pl_PL.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C             LC_MEASUREMENT=pl_PL.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] testthat_1.0.2       rmarkdown_1.0.9016   RevoUtilsMath_10.0.0

loaded via a namespace (and not attached):
 [1] Rcpp_0.12.7      crayon_1.3.2     digest_0.6.10    assertthat_0.1   R6_2.1.3         formatR_1.4      magrittr_1.5    
 [8] evaluate_0.9     stringi_1.1.2    RevoUtils_10.0.1 tools_3.3.1      stringr_1.1.0    rsconnect_0.4.3  yaml_2.1.13     
[15] htmltools_0.3.5  knitr_1.14       tibble_1.2

母版页的代码隐藏在

之下

<?xml version="1.0" encoding="utf-8" ?>
<MasterDetailPage xmlns="http://xamarin.com/schemas/2014/forms"
         xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
         xmlns:pages="clr-namespace:App2;assembly=App2"
         x:Class="App2.ParentsMenuPage">
<MasterDetailPage.Master>
<pages:ParentMasterPage x:Name="masterPage" />
</MasterDetailPage.Master>
<MasterDetailPage.Detail>
<NavigationPage>
  <x:Arguments>
    <pages:ParentHomePage />
   </x:Arguments>
  </NavigationPage>
</MasterDetailPage.Detail>
</MasterDetailPage>


 The Xaml code for My Master Page is below


 <?xml version="1.0" encoding="utf-8" ?>
 <ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
         xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
         x:Class="App2.ParentMasterPage" Padding="0,40,0,0">
<ContentPage.Content>
<StackLayout VerticalOptions="FillAndExpand">
  <ListView x:Name="listView" VerticalOptions="FillAndExpand" SeparatorVisibility="None">
    <ListView.ItemTemplate>
      <DataTemplate>
        <ImageCell Text="{Binding Title}" ImageSource="{Binding IconSource}" />
      </DataTemplate>
    </ListView.ItemTemplate>
   </ListView>
  </StackLayout>
</ContentPage.Content>

然后详细页面

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using Xamarin.Forms;

namespace App2
{
public class ParentMasterItem
{
    public string Title { get; set; }
    public string IconSource { get; set; }
    public Type TargetType { get; set; }
}

public partial class ParentMasterPage : ContentPage
{
    public ListView ListView { get { return listView; } }

    public ParentMasterPage()
    {
        InitializeComponent();

        var masterPageItems = new List<ParentMasterItem>();
        masterPageItems.Add(new ParentMasterItem
        {
            Title = "Home",
            IconSource = "images/home-small.png",
            TargetType = typeof(ParentHomePage)
        });
        masterPageItems.Add(new ParentMasterItem
        {
            Title = "My Ward's",
            IconSource = "images/ward-small.png",
            TargetType = typeof(ParentWardsPage)
        });
        masterPageItems.Add(new ParentMasterItem
        {
            Title = "Chat",
            IconSource = "images/chat-small.png",
            TargetType = typeof(ParentChatPage)
        });

        listView.ItemsSource = masterPageItems;
       }
      }
    }

请任何人帮我解决问题所在

Answer 1

MyMasterPage应该有一个标题。
考虑在MasterDetailsPage.Master内标记内容页面应该有标题。

mscorlib.ni.dll中出现“System.Reflection.TargetInvocationException”类型的异常，但未在用户代码中处理：在Xamarin表单中

1 个答案: