WPF- ViewModel [英] WPF- ViewModel

问题描述

我目前正在尝试使用ViewModel模式并提出错误。

我在向现有viewmodel类添加新属性时出错。

错误显示为"名称"ViewModel"名称空间"clr-namespace：ViewModels"中不存在。" 但是我可以成功构建我的项目。但无法访问设计视图。我试图清理构建并重建 
和 厌倦了创建新项目，但仍然有相同的问题..我不明白为什么这些类型的错误显示。任何人都可以提供解决方案来解决这个问题。它将帮助我前进。非常感谢。 

The Error shown as "The name "ViewModel" does not exist in the namespace "clr-namespace:ViewModels"."  However i can build my project successfully. But cannot access the design view. I tried to clean the build and rebuild  and  tired to creating new project but still having the same issue.. i did't understand why these type of error displays. Could anyone give the solutions to solve this problem. it will help me to moving forward. Thanks a lot. 

推荐答案

嗨Gowthaman Duraisamy ，

Hi Gowthaman Duraisamy,

根据您的错误消息，您似乎没有在窗口实体中定义xmlns，如下所示：

According to your error message, it seems that you have not define xmlns in your window entity, like this:

<Window
    x:Class="MyWpfApplication.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:v="clr-namespace:MyWpfApplication.Views"
    xmlns:vm="clr-namespace:MyWpfApplication.ViewModels"
    Title="DERP"
    Content="{Binding DataContext, RelativeSource={RelativeSource Self}}">
    <Window.Resources>
        <DataTemplate
            DataType="{x:Type vm:MainWindowViewModel}">
            <v:MainWindowView />
        </DataTemplate>
    </Window.Resources>
    <Window.DataContext>
        <vm:MainWindowViewModel />
    </Window.DataContext>
</Window>

如果问题仍然存在，请提供相关代码，以便重现问题。或者通过OneDrive分享一个简单的演示。

if the issue still exist, could you please provide related code, which could reproduce the issue. or share a simple demo via OneDrive.

祝你好运，

张龙

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