你好,
请参考这样的方法来解决。
1. 新建一个Page,然后在设计界面打开,看是否报错,如果也报错的话,应该是VS没有安装成功。建议修复一下;
2. 清理一下你的解决方案,然后重新编译;
3. 重新启动VS;
谢谢!
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