Visual Studio 2019数据集设计器错误：值不能为空。参数名称：实例 [英] Visual Studio 2019 Dataset Designer Error: Value cannot be null. Parameter name:instance

问题描述

我在VS 2109中打开了一个现有项目。 当试图打开任何数据集时，我收到以下错误。

I have opened an existing project in VS 2109.  When trying to open any data set I get the following error.

值不能为空。参数名称：实例

Value cannot be null. Parameter name:instance

调用堆栈：

在System.ComponentModel.TypeDescriptor.AddAttributes（对象实例，属性[]属性）

at Microsoft.VisualStudio.Design.VSDesignSurface.CreateDesigner（IComponent component，Boolean rootDesigner）

at System.ComponentModel.Design.DesignerHost.AddToContainerPostProcess（IComponent component，String name，IContainer containerToAddTo）< System.ComponentModel.Design.DesignerHost.PerformAdd（IComponent组件，String name）的
在System.ComponentModel.Design.DesignerHost.Add（IComponent组件，String name）的
<在System.ComponentModel.Container.Add（IComponent组件）上的
在Microsoft.VSDesigner.DataSource.Designer.DataSourceDesignerLoader.HandleLoad（IDesignerSerializationManager serializationManager）的


at Microsoft.VSDesigner.DesignerFramework.BaseDesignerLoader.PerformLoad（IDesignerSerializationManager serializationManager）

at Microsoft.VSDesigner.Desig nerFramework.BaseDesignerLoader.Microsoft.VisualStudio.TextManager.Interop.IVsTextBufferDataEvents.OnLoadCompleted（Int32 fReload）

at System.ComponentModel.TypeDescriptor.AddAttributes(Object instance, Attribute[] attributes)
at Microsoft.VisualStudio.Design.VSDesignSurface.CreateDesigner(IComponent component, Boolean rootDesigner)
at System.ComponentModel.Design.DesignerHost.AddToContainerPostProcess(IComponent component, String name, IContainer containerToAddTo)
at System.ComponentModel.Design.DesignerHost.PerformAdd(IComponent component, String name)
at System.ComponentModel.Design.DesignerHost.Add(IComponent component, String name)
at System.ComponentModel.Container.Add(IComponent component)
at Microsoft.VSDesigner.DataSource.Designer.DataSourceDesignerLoader.HandleLoad(IDesignerSerializationManager serializationManager)
at Microsoft.VSDesigner.DesignerFramework.BaseDesignerLoader.PerformLoad(IDesignerSerializationManager serializationManager)
at Microsoft.VSDesigner.DesignerFramework.BaseDesignerLoader.Microsoft.VisualStudio.TextManager.Interop.IVsTextBufferDataEvents.OnLoadCompleted(Int32 fReload)

我尝试更改目标框架。 没有帮助。

I have tried changing the target Framework.  Did not help.

有什么建议吗？

推荐答案

可能有初步修复。

May have an initial fix.

我的项目是针对Framework 4.6.1。  ;我将目标框架更改为4.7.2。 然后我就可以打开所有数据集。 

My project was targeted to Framework 4.6.1.  I changed the target Framework to 4.7.2.  I was then able to open all datasets. 

我尝试了其他几个版本（4.5,4.6.2,4.7.1，没有其他框架版本可以使用。

I tried several other versions (4.5, 4.6.2, 4.7.1, etc. ), no other Framework version worked.

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