c# - 为什么 azure 函数看不到配置的连接字符串？

Question

由于某种奇怪的原因，我的 azure 函数停止看到应用程序配置中的连接字符串。

我可以保证这段代码之前可以工作，在它工作之后我继续在主函数中添加简单的验证，最后它停止查找配置的连接字符串。

现在的问题是 GetMetaData 函数，当访问 mongo:cs 连接字符串时，会引发异常，并显示错误“对象引用未设置为对象的实例”，这意味着未找到连接字符串 mongo:cs。

我向该函数添加了一些调试代码，以便查看加载了哪些连接字符串，并发现加载的连接字符串与配置的连接字符串不对应。

有人遇到过类似的问题吗？

您可以找到完整的函数代码、输出和配置了连接字符串的图像

运行时版本:最新(~1)

using MongoDB.Bson;
using MongoDB.Driver;
using System.Configuration;
using System.Net;

public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, TraceWriter log)
{
    log.Info($"C# HTTP trigger function processed a request. RequestUri={req.RequestUri}");

    // parse query parameter
    string sId = req.GetQueryNameValuePairs()
        .FirstOrDefault(q => string.Compare(q.Key, "id", true) == 0)
        .Value;

    Guid id;
    log.Info($"Step1={sId}");
    if(Guid.TryParse(sId, out id)) 
    {
        log.Info($"Step1.5={id}");
        string metaData = GetMetaData(id, log);
        log.Info($"Step2");
        if(String.IsNullOrEmpty(metaData)) 
        {
            log.Info($"Step3");
            return req.CreateResponse(HttpStatusCode.NotFound);
        } 
        else 
        {
            log.Info($"Step4");
            return req.CreateResponse(HttpStatusCode.OK, metaData);
        }

    } 
    else 
    {
        log.Info($"Step5");
        return req.CreateResponse(HttpStatusCode.BadRequest);
    }
}

private static string GetMetaData(Guid id, TraceWriter log) 
{
    //Begin debug code that was added after the connection string stopped working
    log.Info($"Step6");
    var count = ConfigurationManager.ConnectionStrings.Count;
    log.Info($"Count={count}");
    var name0 = ConfigurationManager.ConnectionStrings[0].Name;
    log.Info($"Name0={name0}");
    var name1 = ConfigurationManager.ConnectionStrings[1].Name;
    log.Info($"Name1={name1}");
    //End debug code
    string cnn = ConfigurationManager.ConnectionStrings["mongo:cs"].ConnectionString;
    log.Info($"Step7");
    IMongoClient client = new MongoClient(cnn);
    log.Info($"Step8");
    IMongoDatabase db = client.GetDatabase("cxsopdev");
    log.Info($"Step9");
    var filter = Builders<BsonDocument>.Filter.Eq("_id", id);
    log.Info($"Step10");
    var result = db.GetCollection<BsonDocument>("excelfiletoload").Find(filter).FirstOrDefault();
    log.Info($"Step11");
    return result.ToString();
}

2016-11-12T00:27:56.786 Function started (Id=20c0183f-9989-4a62-9834-461df7fd8ae5)
2016-11-12T00:27:56.786 C# HTTP trigger function processed a request. RequestUri={...}
2016-11-12T00:27:56.786 Step1=857B689F-C32B-46DA-BCD9-05D92A0F151A
2016-11-12T00:27:56.786 Step1.5=857b689f-c32b-46da-bcd9-05d92a0f151a
2016-11-12T00:27:56.786 Step6
2016-11-12T00:27:56.786 Count=2
2016-11-12T00:27:56.786 Name0=LocalSqlServer
2016-11-12T00:27:56.786 Name1=LocalMySqlServer
2016-11-12T00:27:56.786 Function completed (Failure, Id=20c0183f-9989-4a62-9834-461df7fd8ae5)
2016-11-12T00:27:56.786 Exception while executing function: Functions.GetImportMetaData. GetImportMetaData: Object reference not set to an instance of an object.

Connection strings configured

Answer 1

您发现了一个错误!

暂时请将 FUNCTIONS_EXTENSION_VERSION 应用设置更改回 ~0.9。我们希望尽快通过修补程序更新 ~1。一旦我们确认它已修复，我会尽力记住更新它。

还创建了一个问题，以确保我们从现在开始测试 ConfigurationManager 正常工作... https://github.com/Azure/azure-webjobs-sdk-templates/issues/353