C# 如何设置#define预编译指令

在VS2017或者更高的版本中

可以在程序集的属性来修改，如下：

也可以按照如下方式修改代码：

 1 <Project Sdk="Microsoft.NET.Sdk">
 2 
 3   <PropertyGroup>
 4     <TargetFramework>net6.0</TargetFramework>
 5     <ImplicitUsings>enable</ImplicitUsings>
 6     <Nullable>enable</Nullable>
 7   </PropertyGroup>
 8 
 9   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
10     <DefineConstants>$(DefineConstants);INIT_DB</DefineConstants>
11   </PropertyGroup>
12 
13   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">
14     <DefineConstants>$(DefineConstants);INIT_DB</DefineConstants>
15   </PropertyGroup>
16 
17   <ItemGroup>
18     <PackageReference Include="Microsoft.Extensions.Configuration" Version="6.0.1" />
19     <PackageReference Include="Microsoft.Extensions.Logging" Version="6.0.0" />
20     <PackageReference Include="SqlSugarCore" Version="5.1.2.2" />
21   </ItemGroup>
22 
23   <ItemGroup>
24     <ProjectReference Include="..\Common.Domain\Common.Domain.csproj" />
25   </ItemGroup>
26 
27 </Project>

文件中的使用方案：

#if INIT_DB
//only when your want to init db
                ConfigureExternalServices = new ConfigureExternalServices
                {
                    EntityService = (c, p) =>
                    {
                        if (p.PropertyName.Equals(nameof(Common.Domain.LogicDeleted.IsDeleted)))
                        {
                            p.IsPrimarykey = true;
                        }
                    }
                },
#endif