在 ViewModel 问题中绑定到对象属性

Question

不确定为什么这不起作用...下面是我的 ViewModel，它设置为我的 View DataContext。

public class UploadViewModel : CrudVMBase
    {
        #region Commands
        public CommandVM UploadButtonCommand { get; set; } =
            new CommandVM
            {
                CommandDisplay = "Perform Upload",
                IconGeometry = App.Current.Resources["pencil30"] as Geometry,
                Message = new CommandMessage { Command = CommandType.UploadFromCamera }
            };
        #endregion End Commands

        #region Public Properties
        UploadInitiation UploadObject { get; set; } = new UploadInitiation();
        #endregion End Public Properties

        public UploadViewModel()
        {

        }

下面是 UploadInitiation class

public class UploadInitiation : Common.NotifyUIBase
    {
        #region Public Properties
            public ObservableCollection<UploadStep> Steps { get; set; } = new ObservableCollection<UploadStep>();
            public int UploadProgress { get; set; } = 45;
            public string UploadTask { get; set; } = "Idle...";
            public bool UploadEnabled { get; set; } = false;
            public bool UploadBegin { get; set; } = false;
        #endregion END Public Properties

        public UploadInitiation()
        {
            // Populate steps required, ensure upload returns UI updates
            Steps.Add(new UploadStep { Message = "Seperate upload to new thread...", Complete = false, Error = null });
            Steps.Add(new UploadStep { Message = "Generate new file names...", Complete = false, Error = null });
            Steps.Add(new UploadStep { Message = "Render Thumbnails, add to database...", Complete = false, Error = null });
            Steps.Add(new UploadStep { Message = "Move images ready for print...", Complete = false, Error = null });
        }
    }

这是我的绑定，您可以看到我正在尝试绑定到 UploadProgress 属性。

<ProgressBar Style="{StaticResource CircularProgress}" Width="180" Value="{Binding UploadObject.UploadProgress}" />

这里是错误

System.Windows.Data Error: 40 : BindingExpression path error: 'UploadObject' property not found on 'object' ''UploadViewModel' (HashCode=33902366)'. BindingExpression:Path=UploadObject.UploadProgress; DataItem='UploadViewModel' (HashCode=33902366); target element is 'ProgressBar' (Name=''); target property is 'Value' (type 'Double')

Answer 1

您需要将属性的作用域声明为 public，否则默认为私有。因此绑定时不可见

public UploadInitiation UploadObject { get; set; } = new UploadInitiation();

在 ViewModel 问题中绑定到对象属性

Binding to Object Property in ViewModel issue

c#

wpf

mvvm

datacontext

access-modifiers

在 ViewModel 问题中绑定到对象 属性

Binding to Object Property in ViewModel issue

c#

wpf

mvvm

datacontext

access-modifiers

在 ViewModel 问题中绑定到对象属性