我正在使用 VS 2019 社区升级客户的旧 VB.Net (2003) 桌面应用程序。我有一个无法解决的问题。我收到一个 BC2008 错误代码，描述为“未指定输入源”。
我做了一些谷歌搜索，有些人发现重新安装 VS 以某种方式解决了问题，但对我没有用。我什至不知道如何调试这个。据我所知，该项目与升级前的2003版本相同。
有任何想法吗？
错误：
数据层项目：
编辑：
.vbproj 文件的内容：
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="Current" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" DefaultTargets="Build">
<PropertyGroup>
<ProjectType>Local</ProjectType>
<ProductVersion>7.10.3077</ProductVersion>
<SchemaVersion>2.0</SchemaVersion>
<ProjectGuid>{4934644F-F06D-4F6D-B0D1-BF892686E073}</ProjectGuid>
<SccProjectName>
</SccProjectName>
<SccLocalPath>
</SccLocalPath>
<SccAuxPath>
</SccAuxPath>
<SccProvider>
</SccProvider>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
<ApplicationIcon />
<AssemblyKeyContainerName />
<AssemblyName>DataLayer</AssemblyName>
<AssemblyOriginatorKeyFile />
<AssemblyOriginatorKeyMode>None</AssemblyOriginatorKeyMode>
<DefaultClientScript>JScript</DefaultClientScript>
<DefaultHTMLPageLayout>Grid</DefaultHTMLPageLayout>
<DefaultTargetSchema>IE50</DefaultTargetSchema>
<DelaySign>false</DelaySign>
<OutputType>Library</OutputType>
<OptionCompare>Binary</OptionCompare>
<OptionExplicit>On</OptionExplicit>
<OptionStrict>Off</OptionStrict>
<RootNamespace>DataLayer</RootNamespace>
<StartupObject>DataLayer.%28None%29</StartupObject>
<FileUpgradeFlags>
</FileUpgradeFlags>
<MyType>Windows</MyType>
<UpgradeBackupLocation>
</UpgradeBackupLocation>
<OldToolsVersion>0.0</OldToolsVersion>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
<OutputPath>bin\</OutputPath>
<DocumentationFile>DataLayer.xml</DocumentationFile>
<BaseAddress>285212672</BaseAddress>
<ConfigurationOverrideFile />
<DefineConstants />
<DefineDebug>true</DefineDebug>
<DefineTrace>true</DefineTrace>
<DebugSymbols>true</DebugSymbols>
<Optimize>false</Optimize>
<RegisterForComInterop>false</RegisterForComInterop>
<RemoveIntegerChecks>false</RemoveIntegerChecks>
<TreatWarningsAsErrors>false</TreatWarningsAsErrors>
<WarningLevel>1</WarningLevel>
<NoWarn>42016,42017,42018,42019,42032,42353,42354,42355</NoWarn>
<DebugType>full</DebugType>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
<OutputPath>bin\</OutputPath>
<DocumentationFile>DataLayer.xml</DocumentationFile>
<BaseAddress>285212672</BaseAddress>
<ConfigurationOverrideFile />
<DefineConstants />
<DefineDebug>false</DefineDebug>
<DefineTrace>true</DefineTrace>
<DebugSymbols>false</DebugSymbols>
<Optimize>true</Optimize>
<RegisterForComInterop>false</RegisterForComInterop>
<RemoveIntegerChecks>false</RemoveIntegerChecks>
<TreatWarningsAsErrors>false</TreatWarningsAsErrors>
<WarningLevel>1</WarningLevel>
<NoWarn>42016,42017,42018,42019,42032,42353,42354,42355</NoWarn>
<DebugType>none</DebugType>
</PropertyGroup>
<ItemGroup>
<Import Include="Microsoft.VisualBasic" />
<Import Include="System" />
</ItemGroup>
<ItemGroup>
<Content Include="MySql.Data.dll" />
<Content Include="Paperbase.dll" />
<Content Include="SD.LLBLGen.Pro.DQE.SqlServer.NET11.dll" />
<Content Include="SD.LLBLGen.Pro.ORMSupportClasses.NET11.dll" />
</ItemGroup>
<ItemGroup>
<Folder Include="My Project\" />
</ItemGroup>
<Import Project="$(MSBuildToolsPath)\Microsoft.VisualBasic.targets" />
<PropertyGroup>
<PreBuildEvent />
<PostBuildEvent />
</PropertyGroup>
</Project>