c# - 依赖注入(inject)在 Azure 功能中失败，一旦部署，但在本地工作

Question

我有一个类，它有一个公共(public)构造函数，它采用 SqlConnection作为参数。

private readonly SqlConnection _sqlConnection;

public Sample(SqlConnection sqlConnection)
{
    _sqlConnection = sqlConnection;
}

在启动文件中我正在尝试做 DI

var sqlConnection = new SqlConnection(Environment.GetEnvironmentVariable("AzureSQLConnection"));

builder.Services.AddSingleton<SqlConnection>(sqlConnection);

它在本地运行，但在部署到 Azure 时失败并出现错误

System.InvalidOperationException : Unable to resolve service for type 'System.Data.SqlClient.SqlConnection' while attempting to activate 'Test.Sample.Sample'. at Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetService(IServiceProvider sp,Type type,Type requiredBy,Boolean isDefaultParameterRequired) at lambda_method(Closure ,IServiceProvider ,Object[] ) at Microsoft.Azure.WebJobs.Host.Executors.DefaultJobActivator.CreateInstance[T](IServiceProvider serviceProvider) at C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\DefaultJobActivator.cs : 37 at Microsoft.Azure.WebJobs.Host.Executors.DefaultJobActivator.CreateInstance[T](IFunctionInstanceEx functionInstance) at C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\DefaultJobActivator.cs : 32 at Microsoft.Azure.WebJobs.Host.Executors.ActivatorInstanceFactory1.<>c__DisplayClass1_1.<.ctor>b__0(IFunctionInstanceEx i) at C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\ActivatorInstanceFactory.cs : 20 at Microsoft.Azure.WebJobs.Host.Executors.ActivatorInstanceFactory1.Create(IFunctionInstanceEx functionInstance) at C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\ActivatorInstanceFactory.cs : 26 at Microsoft.Azure.WebJobs.Host.Executors.FunctionInvoker`2.CreateInstance(IFunctionInstanceEx functionInstance) at C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionInvoker.cs : 44 at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.ParameterHelper.Initialize() at C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs : 846 at async Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.TryExecuteAsyncCore(IFunctionInstanceEx functionInstance,CancellationToken cancellationToken) at C:\projects\azure-webjobs-sdk-rqm4t\src\Microsoft.Azure.WebJobs.Host\Executors\FunctionExecutor.cs : 117

Answer 1

尝试检查 SqlConnection 的命名空间在启动和 Test.Sample.Sample classes .问题是有两个名称几乎相同的类( Microsoft.Data.SqlClient.SqlConnection 和 System.Data.SqlClient.SqlConnection )。
两个类中的类型必须相同。