Compiler Error ASPIRE008

Version introduced: 9.2.0

‘[ProjectName]’ project requires GenerateAssemblyInfo to be enabled. The Aspire AppHost relies on assembly metadata attributes to locate required dependencies.

This error appears when an Aspire AppHost project has GenerateAssemblyInfo set to false. The Aspire AppHost relies on AssemblyMetadataAttribute to embed DCP (Developer Control Plane) and Dashboard paths during compilation. When GenerateAssemblyInfo is disabled, these attributes aren’t generated, causing runtime failures about missing orchestration dependencies.

Example

The following AppHost project file has GenerateAssemblyInfo disabled, which causes ASPIRE008:

C# project file

<Project Sdk="Aspire.AppHost.Sdk/13.1.0">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net10.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
    <UserSecretsId>98048c9c-bf28-46ba-a98e-63767ee5e3a8</UserSecretsId>
    <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
  </PropertyGroup>

</Project>

To correct this error

Remove the <GenerateAssemblyInfo>false</GenerateAssemblyInfo> line from your project file, or set it to true:

C# project file

<Project Sdk="Aspire.AppHost.Sdk/13.1.0">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net10.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
    <UserSecretsId>98048c9c-bf28-46ba-a98e-63767ee5e3a8</UserSecretsId>
  </PropertyGroup>

</Project>

Suppress the error

Danger

Suppressing this error isn’t recommended, as it will cause runtime failures when the AppHost attempts to locate orchestration dependencies.

If you must temporarily suppress this error, add the following property to your project file:

C# project file

<PropertyGroup>
  <NoWarn>$(NoWarn);ASPIRE008</NoWarn>
</PropertyGroup>