Question

对于使用C＃和Xamarin进行Android开发我还是很陌生。我有一个问题，我开始使用MasterDetailPage，现在当我更改MasterDetailpage的xml时，我很难编译程序才能成功运行。

我的代码看起来像这样：

XAML

<?xml version="1.0" encoding="utf-8" ?>
<MasterDetailPage xmlns="http://xamarin.com/schemas/2014/forms" 
                  xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                  x:Class="NavigationMasterDetail.MainPage">

    <MasterDetailPage.Master>
        <ContentPage Title="Menu">
            <Grid BackgroundColor="Transparent">
                <Grid.RowDefinitions>
                    <RowDefinition Height="200" />
                    <RowDefinition Height="*" />
                </Grid.RowDefinitions>
                <Grid>
                    <Image Source="bg.png" Aspect="AspectFill" />
                    <StackLayout Padding="0,20,0,0" HorizontalOptions="CenterAndExpand" VerticalOptions="CenterAndExpand">
                        <Image BorderColor="White" Source="profile.png" Aspect="AspectFill" WidthRequest="85" HeightRequest="85" />
                        <Label Text="Adam Pedley" TextColor="White" FontSize="Large" />
                    </StackLayout>
                </Grid>
                <StackLayout Margin="20,20,20,0" Grid.Row="1" Spacing="15">
                    <ListView x:Name="navigationDrawerList" RowHeight="60" SeparatorVisibility="None" BackgroundColor="#e8e8e8" ItemSelected="OnMenuItemSelected">
                        <ListView.ItemTemplate>
                            <DataTemplate>
                                <ViewCell>
                                    <!-- Main design for our menu items -->
                                    <StackLayout VerticalOptions="FillAndExpand" Orientation="Horizontal" Padding="20,10,0,10" Spacing="20">
                                        <Image Source="{Binding Icon}" WidthRequest="40" HeightRequest="40" VerticalOptions="Center" />
                                        <Label Text="{Binding Title}" FontSize="Medium" VerticalOptions="Center" TextColor="Black" />
                                    </StackLayout>
                                </ViewCell>
                            </DataTemplate>
                        </ListView.ItemTemplate>
                    </ListView>
                </StackLayout>
            </Grid>
        </ContentPage>
    </MasterDetailPage.Master>
    <MasterDetailPage.Detail>
        <NavigationPage></NavigationPage>
    </MasterDetailPage.Detail>
</MasterDetailPage>

现在，后面的代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;
using xfMasterDetailNavigation.MenuItems;
using xfMasterDetailNavigation.Views;

namespace xfMasterDetailNavigation
{
    public partial class MainPage : MasterDetailPage
    {
        public List<MasterPageItem> menuList
        {
            get;
            set;
        }
        public MainPage()
        {
            InitializeComponent();
            menuList = new List<MasterPageItem>();
            // Adding menu items to menuList and you can define title ,page and icon  
            menuList.Add(new MasterPageItem()
            {
                Title = "Home",
                Icon = "homeicon.png",
                TargetType = typeof(HelloTest)
            });
            menuList.Add(new MasterPageItem()
            {
                Title = "Contact",
                Icon = "contacticon.png",
                TargetType = typeof(Information)
            });
            menuList.Add(new MasterPageItem()
            {
                Title = "About",
                Icon = "abouticon.png",
                TargetType = typeof(AboutMe)
            });
            // Setting our list to be ItemSource for ListView in MainPage.xaml  
            navigationDrawerList.ItemsSource = menuList;
            // Initial navigation, this can be used for our home page  
            Detail = new NavigationPage((Page)Activator.CreateInstance(typeof(HelloTest)));
        }

        private void OnMenuItemSelected(object sender, SelectedItemChangedEventArgs e)
        {
            var item = (MasterPageItem)e.SelectedItem;
            Type page = item.TargetType;
            Detail = new NavigationPage((Page)Activator.CreateInstance(page));
            IsPresented = false;
        }
    }
}

现在这是我得到的错误：

1.) InitializeComponent() does not exist in current component
2.) navigationDrawerList does not exist in current component
3.) Property BorderColor was not found in type Image

现在，我从这里https://www.c-sharpcorner.com/article/dynamic-master-detail-page-in-xamarin-forms/开始按照循序渐进的教程

现在请我想知道我在哪里弄错了。我对此很陌生

Answer 1

我根据教程制作了样本。

1。）当前组件中不存在InitializeComponent（）

在我的代码中，它运行良好。也许您的项目无法很好地加载。清理并重建。尝试在设备上运行，如果可以正常运行，请忽略该错误。没关系。

2。）navigationDrawerList在当前组件中不存在

navigationDrawerList已在您的Mainpage列表视图中定义。同样，删除项目的obj和bin文件夹以清理并重建。

3。）在图像类型中找不到属性BorderColor

删除此图像控件的BorderColor属性。此图像不具有BorderColor属性。删除它，一切都会好的。

有关更多详细信息，可以检查Image类：https://docs.microsoft.com/en-us/dotnet/api/xamarin.forms.image?view=xamarin-forms

我将代码示例上传到GitHub，您可以从Test1/XamarinDemo文件夹下载以进行检查。 https://github.com/WendyZang/Test.git

Masterdetailpage Xml返回错误：找不到InitializeComponent

1 个答案: