C# 如何使用Azure函数使用托管标识连接Azure SQL DW

我已尝试使用Azure功能代码连接到SQL server，并已成功连接。然而，当我尝试对SQLDW（非指定SQL池）使用相同的代码时，我得到了以下错误

有人能帮我吗？我想不出这里有什么问题

message": "Exception while executing function: Synapse_Connectivity -> A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 25 - Connection string is not valid) -> The parameter is incorrect",
    "errorDetails": "Microsoft.Azure.WebJobs.Host.FunctionInvocationException : Exception while executing function: Synapse_Connectivity ---> System.Data.SqlClient.SqlException : A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 25 - Connection string is not valid) ---> System.ComponentModel.Win32Exception : The parameter is incorrect \r\n   End of inner exception\r\n   at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity,SqlConnectionString connectionOptions,SqlCredential credential,Object providerInfo,String newPassword,SecureString newSecurePassword,Boolean redirectedUserInstance,SqlConnectionString userConnectionOptions,SessionData reconnectSessionData,DbConnectionPool pool,String accessToken,Boolean applyTransientFaultHandling,SqlAuthenticationProviderManager sqlAuthProviderManager)\r\n   at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options,DbConnectionPoolKey poolKey,Object poolGroupProviderInfo,DbConnectionPool pool,DbConnection owningConnection,DbConnectionOptions userOptions)\r\n   at System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool,DbConnection owningObject,DbConnectionOptions options,DbConnectionPoolKey poolKey,DbConnectionOptions userOptions)\r\n   at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject,DbConnectionOptions userOptions,DbConnectionInternal oldConnection)\r\n   at System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject,DbConnectionOptions userOptions,DbConnectionInternal oldConnection)\r\n   at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject,UInt32 waitForMultipleObjectsTimeout,Boolean allowCreate,Boolean onlyOneCheckConnection,DbConnectionOptions userOptions,DbConnectionInternal& connection)\r\n   at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject,TaskCompletionSource`1 retry,DbConnectionOptions userOptions,DbConnectionInternal& connection)\r\n   at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection,TaskCompletionSource`1 retry,DbConnectionOptions userOptions,DbConnectionInternal oldConnection,DbConnectionInternal& connection)\r\n   at System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection,DbConnectionFactory connectionFactory,TaskCompletionSource`1 retry,DbConnectionOptions userOptions)\r\n   at System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection,DbConnectionFactory connectionFactory,TaskCompletionSource`1 retry,DbConnectionOptions userOptions)\r\n   at System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource`1 retry)\r\n   at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)\r\n   at System.Data.SqlClient.SqlConnection.Open()\r\n   at async FunctionApp_WBA_QA.Synapse_Connectivity.Run(HttpRequestMessage req,TraceWriter log)\r\n   at async Microsoft.Azure.WebJobs.Host.Executors.FunctionInvoker`2.InvokeAsync[TReflected,TReturnValue](Object instance,Object[] arguments)\r\n   at async Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.InvokeAsync(IFunctionInvoker invoker,ParameterHelper parameterHelper,CancellationTokenSource timeoutTokenSource,CancellationTokenSource functionCancellationTokenSource,Boolean throwOnTimeout,TimeSpan timerInterval,IFunctionInstance instance)\r\n   at async Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.ExecuteWithWatchersAsync(IFunctionInstance instance,ParameterHelper parameterHelper,TraceWriter traceWriter,CancellationTokenSource functionCancellationTokenSource)\r\n   at async Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.ExecuteWithLoggingAsync(??)\r\n   at async Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.ExecuteWithLoggingAsync(??) \r\n   End of inner exception\r\n   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\r\n   at async Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.ExecuteWithLoggingAsync(??)\r\n   at async Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.TryExecuteAsync(IFunctionInstance functionInstance,CancellationToken cancellationToken)\r\n   at Microsoft.Azure.WebJobs.Host.Executors.ExceptionDispatchInfoDelayedException.Throw()\r\n   at async Microsoft.Azure.WebJobs.JobHost.CallAsync(??)\r\n   at async Microsoft.Azure.WebJobs.Script.ScriptHost.CallAsync(String method,Dictionary`2 arguments,CancellationToken cancellationToken)\r\n   at async Microsoft.Azure.WebJobs.Script.WebHost.WebScriptHostManager.HandleRequestAsync(FunctionDescriptor function,HttpRequestMessage request,CancellationToken cancellationToken)\r\n   at async Microsoft.Azure.WebJobs.Script.Host.FunctionRequestInvoker.ProcessRequestAsync(HttpRequestMessage request,CancellationToken cancellationToken,WebScriptHostManager scriptHostManager,WebHookReceiverManager webHookReceiverManager)\r\n   at async Microsoft.Azure.WebJobs.Script.WebHost.Controllers.FunctionsController.<>c__DisplayClass3_0.<ExecuteAsync>b__0(??)\r\n   at async Microsoft.Azure.WebJobs.Extensions.Http.HttpRequestManager.ProcessRequestAsync(HttpRequestMessage request,Func`3 processRequestHandler,CancellationToken cancellationToken)\r\n   at async Microsoft.Azure.WebJobs.Script.WebHost.Controllers.FunctionsController.ExecuteAsync(HttpControllerContext controllerContext,CancellationToken cancellationToken)\r\n   at async System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsync(HttpRequestMessage request,CancellationToken cancellationToken)\r\n   at async System.Web.Http.Dispatcher.HttpControllerDispatcher.SendAsync(HttpRequestMessage request,CancellationToken cancellationToken)\r\n   at async Microsoft.Azure.WebJobs.Script.WebHost.Handlers.WebScriptHostHandler.SendAsync(HttpRequestMessage request,CancellationToken cancellationToken)\r\n   at async Microsoft.Azure.WebJobs.Script.WebHost.Handlers.SystemTraceHandler.SendAsync(HttpRequestMessage request,CancellationToken cancellationToken)\r\n   at async System.Web.Http.HttpServer.SendAsync(HttpRequestMessage request,CancellationToken cancellationToken)"
}

message:“执行函数时出现异常：Synapse_Connectivity->建立与SQL Server的连接时发生网络相关或特定于实例的错误。找不到服务器或无法访问服务器。验证实例名称是否正确，以及SQL Server是否配置为允许远程连接。（提供程序：SQL网络接口，错误：25-连接字符串无效）->参数不正确“，
“errorDetails”：“Microsoft.Azure.WebJobs.Host.FunctionInvocationException:执行函数时异常：Synapse_Connectivity-->System.Data.SqlClient.SqlException:建立与SQL Server的连接时发生网络相关或特定于实例的错误。找不到服务器或无法访问服务器。验证实例名称是否正确，以及SQL Server是否配置为允许远程连接。（提供程序：SQL网络接口，错误：25-连接字符串无效）--->System.ComponentModel.Win32Exception:参数不正确\r\n System.Data.SqlClient.SqlInternalConnectionDS..ctor的内部异常结尾\r\n（DbConnectionPoolIdentity、SqlConnectionString connectionOptions、SqlCredential凭证、对象提供信息、String newPassword、SecureString newSecurePassword、Boolean redirectedUserInstance、SqlConnectionString userConnectionOptions、SessionData重新连接SessionData、DbConnectionPool池、String accessToken、Boolean applyTransientFaultHandling、 SqlAuthenticationProviderManager sqlAuthProviderManager）\r\n位于System.Data.SqlClient.SqlConnectionFactory.CreateConnection（DbConnectionOptions、DbConnectionPoolKey poolKey、Object poolGroupProviderInfo、DbConnectionPool池、DbConnection owningConnection、DbConnectionOptions userOptions）\r\n位于System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection（DbConnectionPool pool、DbConnection owningObject、DbConnectionOptions options、DbConnectionPoolKey poolKey、DbConnectionOptions userOptions）\r\n位于System.Data.ProviderBase.DbConnectionPool.CreateObject（DbConnection owningObject、DbConnectionOptions userOptions、DbConnectionInternal oldConnection）\r\n位于System.Data.ProviderBase.DbConnectionPool.UserCreateRequest（DbConnection owningObject、DbConnectionOptions userOptions、DbConnectionInternal oldConnection）\r\n位于System.Data.ProviderBase.DbConnectionPool.TryGetConnection（DbConnection owningObject、UInt32 waitForMultipleObjectsTimeout、布尔allowCreate、布尔onlyOnECKConnection、DbConnectionOptions用户选项、DbConnectionInternal和connection）\r\n位于System.Data.ProviderBase.DbConnectionPool.TryGetConnection（数据库连接所有者对象，TaskCompletionSource`1重试，数据库连接选项用户选项，数据库连接内部和连接）\r\n位于System.Data.ProviderBase.DbConnectionFactory.TryGetConnection（DbConnection owningConnection，TaskCompletionSource`1重试，DbConnectionOptions用户选项，DbConnectionInternal oldConnection，DbConnectionInternal&connection）\r\n位于System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal（DbConnection outerConnection，DbConnectionFactory connectionFactory，TaskCompletionSource`1重试，DbConnectionOptions用户选项）\r\n位于System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection（DbConnection outerConnection，DbConnectionFactory connectionFactory，TaskCompletionSource`1重试，DbConnectionOptions用户选项）\r\n在System.Data.SqlClient.SqlConnection.TryOpen（TaskCompletionSource`1重试）\r\n在System.Data.SqlClient.SqlConnection.TryOpen（TaskCompletionSource`1重试）\r\n在System.Data.SqlClient.SqlConnection.Open（）\r\n在异步函数上运行（HttpRequestMessage req，TraceWriter日志）\r\n异步Microsoft.Azure.WebJobs.Host.Executors.FunctionInvoker`2.InvokeAsync[TReflected，TReturnValue]（对象实例，对象[]参数）\r\n异步Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.InvokeAsync（IFunctionInvoker调用程序、ParameterHelper ParameterHelper、CancellationTokenSource timeoutTokenSource、CancellationTokenSource函数CancellationTokenSource、Boolean throwOnTimeout、TimeSpan timerInterval、IFunctionInstance实例）\r\n位于async Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.ExecuteWithWatchersAsync（IFunctionInstance实例，ParameterHelper ParameterHelper，TraceWriter TraceWriter，CancellationTokenSource functionCancellationTokenSource）\r\n异步Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.Executor.ExecuteWithLoggingAsync（？？）\r\n异步Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.ExecuteWithLoggingAsync（？）\r\n内部异常结束\r\n在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw（）\r\n异步Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.ExecuteWithLoggingAsync（？？）\r\n在异步Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.TryExecuteAsync（IFunctionInstance functionInstance，CancellationToken CancellationToken）\r\n位于Microsoft.Azure.WebJobs.Host.Executors.ExceptionDispatchInfoDelayedException.Throw（）\r\n位于async Microsoft.Azure.WebJobs.JobHost.CallAsync（？？）\r\n位于async Microsoft.Azure.WebJobs.Script.ScriptHost.CallAsync（字符串方法，字典`2参数，CancellationToken CancellationToken）\r\n异步Microsoft.Azure.WebJobs.Script.WebHost.WebScriptHostManager.HandlerRequestAsync（FunctionDescriptor函数，HttpRequestMessage请求，CancellationToken CancellationToken）\r\n位于async Microsoft.Azure.WebJobs.Script.Host.FunctionRequestInvoker.ProcessRequestAsync（HttpRequestMessage请求，CancellationToken CancellationToken，WebScriptHostManager scriptHostM
using System;
using System.Data.SqlClient;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Azure.Services.AppAuthentication;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.Azure.WebJobs.Host;
using Newtonsoft.Json;

namespace FunctionApp_SQL
{
    public static class Synapse_Connectivity
    {
        [FunctionName("Synapse_Connectivity")]
        public static async Task<HttpResponseMessage> Run([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)]HttpRequestMessage req, TraceWriter log)
        {
            log.Info("C# HTTP trigger function processed a request.");

            string synapse_db_server = GetEnvironmentVariable("SYNAPSE_SQLDB_server");
            string synapse_db_name = GetEnvironmentVariable("SYNAPSE_SQLDB_database");

            string ResourceId = "https://database.windows.net/";

            string sqlConnectionString = String.Format("Data Source=tcp:{0},1433;Initial Catalog={1};Persist Security Info=False;Connect Timeout=30;Encrypt=True;TrustServerCertificate=False;MultipleActiveResultSets=true", synapse_db_server, synapse_db_name);

            log.Info($"sqlConnectionString : {sqlConnectionString}");

            /*Gettting the Token FOR SQL*/
            var tokenProvider = new AzureServiceTokenProvider();
            string accessToken = await tokenProvider.GetAccessTokenAsync(ResourceId);
            log.Info($"AccessToken : {accessToken}");

            log.Info("Connecting to database.");

            var myObj = "";

            using (SqlConnection conn = new SqlConnection(sqlConnectionString))
            {
                conn.AccessToken = accessToken;
                conn.Open();

                var statement = $"select * from ext.test for json path";
                log.Info($"{statement}");

                using (SqlCommand cmd = new SqlCommand(statement, conn))
                {
                    using (SqlDataReader reader = cmd.ExecuteReader())
                    {
                        while (reader.Read())
                        {
                            log.Info($"{reader.GetString(0)}");
                            myObj = reader.GetString(0);

                        }
                    }
                }
            }

            var jsonToReturn = JsonConvert.SerializeObject(myObj);

            return new HttpResponseMessage(HttpStatusCode.OK)
            {
                Content = new StringContent(jsonToReturn, Encoding.UTF8, "application/json")
            };

        }

        public static string GetEnvironmentVariable(string name)
        {
            return System.Environment.GetEnvironmentVariable(name, EnvironmentVariableTarget.Process);
        }
    }
}