Question

我正在尝试创建一个MVVM应用程序，该应用程序从API中提取数据并将数据放入用于导航程序的列表中。

我遇到的问题是列表产生了此错误，我无法弄清原因：

绑定：绑定到“ Avalonia.Controls.TextBlock”。“文本”时出错： “在“属性”上找不到CLR属性“名称””

对于上下文，'attributes'类包含'name'变量，我已经确认了name变量是预先填充的（程序在我试图形成列表之前就打印了name变量）。

XAML代码（MainWindow.xaml）：

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:vm="clr-namespace:RT_Stream_App.ViewModels;assembly=RT_Stream_App"
        Icon="resm:RT_Stream_App.Assets.avalonia-logo.ico"
        Title="RT Stream App">

  <Design.DataContext>
    <vm:MainWindowViewModel/>
  </Design.DataContext>

  <ListBox Items="{Binding CompanyList}" HorizontalAlignment="Left" Width="512" Height="512" Margin="20,20,0,10" VerticalAlignment="Top">
    <ListBox.ItemTemplate>
      <DataTemplate>
        <StackPanel DataContext="attributes">
          <TextBlock Text="{Binding name}" TextAlignment="Center" />
        </StackPanel>
      </DataTemplate>
    </ListBox.ItemTemplate>
  </ListBox>
  <!-- <TextBlock Text="{Binding Greeting}" HorizontalAlignment="Center" VerticalAlignment="Center"/>  -->


</Window>

MainWindowViewModel.cs

namespace RT_Stream_App.ViewModels
{
    public class MainWindowViewModel : ViewModelBase
    {
        // use => instead of = for assigning
        // public string Greeting => "I am testing!";

        public companies.APIData siteList => loadCompanies();

        //public string Greeting => TestLoop(siteList);
        public ObservableCollection<companies.companyData> CompanyList => siteList.data;

        public companies.APIData loadCompanies()
        {
            // This takes the API data for companies and converts it into a useable class
            companies.APIData toReturn = JsonConvert.DeserializeObject<companies.APIData>(new WebClient().DownloadString("https://svod-be.roosterteeth.com/api/v1/channels"));
            return toReturn;
        }
    }
}

类别数据（companies.cs）：

namespace RT_Stream_App.Classes
{

public class companies
{
    /// <summary>
    /// Root of the JSON
    /// </summary>
    public class APIData
    {
        public ObservableCollection<companyData> data = new ObservableCollection<companyData>();
    }

    /// <summary>
    /// A class that holds the data for each company (Name and link mostly)
    /// </summary>
    public class companyData
    {
        public attributeData attributes = new attributeData();
        public linkData links = new linkData();
    }

    /// <summary>
    /// Contains the company name
    /// </summary>
    public class attributeData
    {
        public string name { get; set; }
    }

    /// <summary>
    /// Contains link data for the next step
    /// </summary>
    public class linkData
    {
        public string shows { get; set; }
    }


}
}

我在做什么错，需要更改什么？

更新：我尝试将XAML中的DataTemplate更改为以下内容：

<DataTemplate>
        <StackPanel>
          <TextBlock Text="{Binding attributes.name}" TextAlignment="Center" />
        </StackPanel>
      </DataTemplate>

哪个会产生此错误：

绑定：绑定到“ Avalonia.Controls.TextBlock”。“文本”时出错： “找不到CLR属性的“属性”

<DataTemplate>
        <StackPanel DataContext="{Binding attributes}">
          <TextBlock Text="{Binding name}" TextAlignment="Center" />
        </StackPanel>
      </DataTemplate>

产生此错误：

绑定：绑定到错误 “ Avalonia.Controls.StackPanel”。“ DataContext”：“找不到CLR 属性“属性”

修复更新：从Kekekeks的答案中，我弄清楚了为什么我的程序无法正常工作，现在列出了负载。由于使用JSON.NET，我担心使用构造函数，但是我对所有类进行了以下更改，并且程序显示了预期的列表

类数据（companies.cs）已更新：公共类APIData {

            public APIData()
            {
                this.data = new ObservableCollection<companyData>();
            }
            public ObservableCollection<companyData> data {
                get;
                set;
                }
            }

Answer 1

您正在将字符串“属性”设置为DataContext。然后Binding在System.String上找不到属性“ name”。

删除DataContext="attributes"，然后将绑定替换为Text="{Binding attributes.name}"

绑定“找不到CLR属性”时出现Avalonia UI错误

1 个答案: