Visual Studio新建VB WinForms项目启动时窗体设计器报错

问题详情 #

新建VB WinForms项目后，未添加任何代码，Visual Studio加载窗体设计器时抛出异常。“加载设计器”提示会持续数分钟才被错误信息替换，完全无法开展开发工作。已尝试重启VS、重启电脑，问题仍反复出现。

错误提示截图显示设计器加载失败的异常信息。

调用栈信息：

at Microsoft.DotNet.DesignTools.Client.Host.ServerProcess.d__36.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.DotNet.DesignTools.Client.Host.ServerProcess.d__28.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.DotNet.DesignTools.Client.Host.ServerHostFactory.d__9.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.DotNet.DesignTools.Client.DesignToolsClientLoader.d__29.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.DotNet.DesignTools.Client.DesignToolsClientLoader.<>c__DisplayClass25_1.<<-ctor>b__1>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at Microsoft.DotNet.DesignTools.Client.DesignToolsClientLoader.d__27.MoveNext()

可行解决步骤 #

• 修复Visual Studio安装：打开Visual Studio Installer，选中对应VS版本，点击「修改」后选择「修复」，完成后重启VS。
• 清理设计器缓存：删除以下路径的缓存文件夹：
  • %LocalAppData%\Microsoft\VisualStudio\<你的VS版本号>\Designer\ShadowCache
  • %LocalAppData%\Microsoft\VisualStudio\<你的VS版本号>\ComponentModelCache
• 禁用第三方扩展：进入VS的「扩展」→「管理扩展」，禁用所有非官方扩展后重启VS，排查是否为扩展冲突导致。
• 切换目标框架：尝试将项目目标.NET框架切换为稳定正式版（例如从.NET 8预览版切换至.NET 7），重新加载项目后测试设计器。
• 重置VS设置：打开VS命令提示符，运行命令 devenv /ResetSettings 重置默认设置，重启后验证问题是否解决。

内容的提问来源于stack exchange，提问作者Sheep_Rustler