初始化

ClassLibrary1/B.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ClassLibrary1
+{
+    internal class B
+    {
+    }
+}

ClassLibrary1/C.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ClassLibrary1
+{
+    internal class C
+    {
+    }
+}

ClassLibrary1/Class1.cs

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+namespace ClassLibrary1
+{
+    public class Class1
+    {
+
+    }
+}

ClassLibrary1/ClassLibrary1.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+	<PropertyGroup>
+		<TargetFramework>net8.0</TargetFramework>
+		<ImplicitUsings>enable</ImplicitUsings>
+		<Nullable>enable</Nullable>
+	</PropertyGroup>
+
+	<!--<ItemGroup>
+		<Compile Include="B.cs" OutputAssembly="File1.dll" />
+		<Compile Include="C.cs" OutputAssembly="File2.dll" />
+	</ItemGroup>-->
+</Project>