环境
首先要下载.NET Core 3.0 与Visual Studio 2019
编辑 csproj 文件
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< Project Sdk = "Microsoft.NET.Sdk.WindowsDesktop" >
< PropertyGroup >
< OutputType >WinExe</ OutputType >
< TargetFramework >netcoreapp3.0</ TargetFramework >
< UseWindowsForms >true</ UseWindowsForms >
< GenerateAssemblyInfo >false</ GenerateAssemblyInfo >
</ PropertyGroup >
</ Project >
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恢复 NuGet 包
找到package.config文件右击选择Upgrade to PackageReference 但是我会弹框
我也不知道该怎么解决,搜了一圈没搜到,如果有知道的可以在评论区告诉我,于是我就老老实实将
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<? xml version = "1.0" encoding = "utf-8" ?>
< packages >
< package id = "Dapper" version = "1.50.2" targetFramework = "net45" />
< package id = "EntityFramework" version = "6.0.0" targetFramework = "net45" />
< package id = "MySql.Data" version = "6.7.9" targetFramework = "net45" />
< package id = "System.Data.SQLite" version = "1.0.108.0" targetFramework = "net45" />
< package id = "System.Data.SQLite.Core" version = "1.0.108.0" targetFramework = "net45" />
< package id = "System.Data.SQLite.EF6" version = "1.0.108.0" targetFramework = "net45" />
< package id = "System.Data.SQLite.Linq" version = "1.0.108.0" targetFramework = "net45" />
</ packages >
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改为下列代码,并写到csproj文件中在 project的子节点中
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< ItemGroup >
< PackageReference Include = "Dapper" Version = "1.50.2" />
< PackageReference Include = "EntityFramework" Version = "6.0.0" />
< PackageReference Include = "MySql.Data" Version = "6.7.9" />
< PackageReference Include = "System.Data.SQLite" Version = "1.0.108.0" />
< PackageReference Include = "System.Data.SQLite.Core" Version = "1.0.108.0" />
< PackageReference Include = "System.Data.SQLite.EF6" Version = "1.0.108.0" />
< PackageReference Include = "System.Data.SQLite.Linq" Version = "1.0.108.0" />
</ ItemGroup >
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增加引用
同时,有些dll是 .net framework独有,而 .net core因为各种原因并没有引用进来的。参考Porting to .NET Core。如以下几个是需要重新引用的:
- System.Data。虽然基础层已经是 .NET Core的一部分,即提供者模型和SQL客户端,但目前还没有一些功能,例如架构支持和DataTable/ DataSet。
- System.DirectoryServices。.NET Core目前不支持与LDAP或Active Directory通信。
- System.Drawing。虽然严格来说它是客户端API,但许多开发人员在服务器上使用绘图API来提供缩略图生成或水印。我们目前在 .NET Core中不支持这些API。
- System.Transactions。虽然ADO.NET支持事务,但不支持分布式事务,其中包括环境事务和登记的概念。
- System.Xml.Xsl和System.Xml.Schema。.NET Core支持XmlDocumentLinq XDocument,包括XPath。但是,目前不支持XSD(XmlSchema)或XSLT(XslTransform)。
- System.Net.Mail。目前不支持使用这些API从 .NET Core发送电子邮件。
- System.IO.Ports。.NET Core目前不包括与串行端口通信的功能。
- System.Workflow。Windows Workflow Foundation(WF)目前在 .NET Core上不可用。
- System.Xaml。在创建UWP应用程序时,开发人员将使用WinRT XAML API。因此,.NET Core目前不包含托管XAML框架,该框架包括解析XAML文档和实例化描述的对象图的能力。
在我的项目中,我引用了这些:
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< ItemGroup >
< Reference Include = "System.Data" />
< Reference Include = "System.Xaml" />
< Reference Include = "System.Transactions" />
< Reference Include = "System.Drawing" />
< Reference Include = "System.Data.DataSetExtensions" />
< Reference Include = "Microsoft.CSharp" />
< Reference Include = "System.Net.Http" />
</ ItemGroup >
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增加其他文件
增加了如下几个项目本身就有的文件
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< ItemGroup >
< None Include = "App_Data\data.db" />
< None Include = "packages.config" />
< None Include = "Properties\Settings.settings" >
< Generator >SettingsSingleFileGenerator</ Generator >
< LastGenOutput >Settings.Designer.cs</ LastGenOutput >
</ None >
</ ItemGroup >
< ItemGroup >
< None Include = "App.config" >
< SubType >Designer</ SubType >
</ None >
</ ItemGroup >
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最终的csproj文件
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< Project Sdk = "Microsoft.NET.Sdk.WindowsDesktop" >
< PropertyGroup >
< OutputType >WinExe</ OutputType >
< TargetFramework >netcoreapp3.0</ TargetFramework >
< UseWindowsForms >true</ UseWindowsForms >
< GenerateAssemblyInfo >false</ GenerateAssemblyInfo >
</ PropertyGroup >
< ItemGroup >
< PackageReference Include = "Dapper" Version = "1.50.2" />
< PackageReference Include = "EntityFramework" Version = "6.0.0" />
< PackageReference Include = "MySql.Data" Version = "6.7.9" />
< PackageReference Include = "System.Data.SQLite" Version = "1.0.108.0" />
< PackageReference Include = "System.Data.SQLite.Core" Version = "1.0.108.0" />
< PackageReference Include = "System.Data.SQLite.EF6" Version = "1.0.108.0" />
< PackageReference Include = "System.Data.SQLite.Linq" Version = "1.0.108.0" />
</ ItemGroup >
< ItemGroup >
< Reference Include = "System.Data" />
< Reference Include = "System.Xaml" />
< Reference Include = "System.Transactions" />
< Reference Include = "System.Drawing" />
< Reference Include = "System.Data.DataSetExtensions" />
< Reference Include = "Microsoft.CSharp" />
< Reference Include = "System.Net.Http" />
</ ItemGroup >
< ItemGroup >
< None Include = "App_Data\data.db" />
< None Include = "packages.config" />
< None Include = "Properties\Settings.settings" >
< Generator >SettingsSingleFileGenerator</ Generator >
< LastGenOutput >Settings.Designer.cs</ LastGenOutput >
</ None >
</ ItemGroup >
< ItemGroup >
< None Include = "App.config" >
< SubType >Designer</ SubType >
</ None >
</ ItemGroup >
</ Project >
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移植过程中遇到的问题
.net core不支持Access数据库
我的代码中有带Access数据库相关代码,都报了缺少程序集引用的错误,因此我初步增加了引用
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< ItemGroup >
< Reference Include = "System.Data" />
< Reference Include = "System.Data.OleDb" />
</ ItemGroup >
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但是还是没用,参考了.NET Core Data Access,发现是.net core不支持Access的原因,因此都把这段代码用条件编译代码 #if 给包起来了。
缺少hostfxr.dll文件
编译成功后运行项目发现弹这个窗口,我查了下C:\Program Files\dotnet文件中是存在hostfxr.dll的,看了环境变量也是手动设置了DOTNET_ROOT变量的,但是总是出错,没办法,最后通过复制hostfxr.dll文件到bin\Debug\netcoreapp3.0\下才运行成功
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原文链接:https://blog.csdn.net/m0_37080285/article/details/90211658