我已经声明了一个基本的对话框窗口类，该类键入datacontext以确保附加的viewmodel具有适当的返回类型。当我尝试使用它时，尽管出现通用参数错误：

  

GenericArguments [1]，   'Mocks.MidSoft_Hospitality_ViewModels_Dialogs_ReceiveItemViewModel_32_569724456'，   上   'Mocks.MidSoft_Hospitality_Views_Dialogs_BaseDialogWindow`2_32_569724456 [TResult，TViewModel]'   违反了类型'TViewModel'的约束。

我不明白为什么会这样

基本对话框窗口声明：

public class BaseDialogWindow<TResult,TViewModel> : DialogWindowBase<TResult> where TViewModel: ViewModels.Dialogs.DialogBaseViewModel<TResult>
{
    public BaseDialogWindow() : base()
    {

    }

    new public TViewModel DataContext
    {
        get => this.Getvalue(DataContextProperty) as TViewModel;
        set => this.Setvalue(DataContextProperty,value);
    }

}

DialogWindowBase：

public class DialogWindowBase<TResult> : Window,IDialog<TResult>
{
    public DialogWindowBase()
    {
        //Formatting code here
    }

    public Result Result { get; set; } = Result.None;

    public TResult ReturnData { get; set; }

}

viewModel：

public class ReceiveItemViewModel : ViewModels.Dialogs.DialogBaseViewModel<ReceiveItemResult>
{
    //View Model Code here
}

和xaml：

<local:BaseDialogWindow x:Class="MidSoft.Hospitality.Views.Dialogs.ReceiveItemDialog"
                        x:TypeArguments="local:ReceiveItemResult,vm:ReceiveItemViewModel"
                        xmlns:vm="clr-namespace:MidSoft.Hospitality.ViewModels.Dialogs"
                        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
                        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
                        xmlns:local="clr-namespace:MidSoft.Hospitality.Views.Dialogs"
                        mc:Ignorable="d"
                        d:DataContext="{d:DesignInstance vm:ReceiveItemViewModel,IsDesignTimeCreatable=False}"
                        x:Name="ReceiveStockItemDialog"
                        Height="450" Width="800">
    <Grid>
    </Grid>
</local:BaseDialogWindow>

对话框代码：

    public partial class ReceiveItemDialog
    {
        public ReceiveItemDialog()
        {
            InitializeComponent();
        }
    }

我上面引用的错误是我得到的唯一编译器错误。我将不胜感激对此错误的了解。

更新：我现在注意到应用程序正在编译并运行，没有引发任何异常，但是错误仍然存​​在，并且xaml设计器将其显示为无效标记