Aspire集成测试中获取Azurite Blob连接字符串的问题

问题场景 #

使用Aspire.Hosting.Testing开展集成测试，SQL Server已配置成功，但Blob存储部分遇到问题：需要将Blob端点的连接字符串传入环境参数。

当前配置Blob容器的代码：

var builder = DistributedApplication.CreateBuilder(args);
var storage = builder
    .AddAzureStorage("storage")
    .RunAsEmulator();

尝试通过以下代码设置环境变量时触发错误：

context.EnvironmentVariables["CustomOptionObject:ConnectionString"] = storage.Resource.BlobEndpoint;

错误堆栈信息：

Failed to apply environment variable 'CustomOptionObject:ConnectionString'. A dependency may have failed to start.
System.InvalidOperationException: No output for blobEndpoint
   at Aspire.Hosting.Azure.BicepOutputReference.get_Value() in /_/src/Aspire.Hosting.Azure/AzureBicepResource.cs:line 400
   at Aspire.Hosting.Azure.BicepOutputReference.GetValueAsync(CancellationToken cancellationToken) in /_/src/Aspire.Hosting.Azure/AzureBicepResource.cs:line 388
   at Aspire.Hosting.ApplicationModel.ExpressionResolver.EvalValueProvider(IValueProvider vp) in /_/src/Aspire.Hosting/ApplicationModel/ExpressionResolver.cs:line 106
   at Aspire.Hosting.ApplicationModel.ExpressionResolver.ResolveInternalAsync(Object value) in /_/src/Aspire.Hosting/ApplicationModel/ExpressionResolver.cs:line 182

已在项目构建器中添加.WaitFor(storage)，需要解决如何正确获取Blob端点的连接字符串引用。

解决方法 #

• 获取完整连接字符串：使用storage.GetConnectionString()方法获取包含端点、账户名、密钥的完整连接字符串，该方法会自动适配模拟器环境，避免解析错误。修改后的代码：

context.EnvironmentVariables["CustomOptionObject:ConnectionString"] = storage.GetConnectionString();

• 仅获取Blob服务端点URL：如果只需要端点地址，使用storage.Resource.BlobServiceUri属性替代BlobEndpoint，该属性在模拟器运行时能正确返回可用的端点值：

context.EnvironmentVariables["CustomOptionObject:BlobEndpoint"] = storage.Resource.BlobServiceUri;

内容的提问来源于stack exchange，提问作者Davy