无法将List<string>从方法1传递到方法2

Question

我正在微软Azure的图书馆工作。我试图动态地返回一个容器列表，在那里我可以作为参数传递到Microsoft的代码中。这两种方法都在同一个类中。

ListContainer()

 static public List<string> ListContainer(StartConfig config)
 {
    List<string> container = new List<string>();

    if (config == null || config.BlobClient == null)
    {
        config = Program.GetConfig();
    }

        //Get the list of the blob from the above container
    IEnumerable<CloudBlobContainer> containers = config.BlobClient.ListContainers();

    foreach (CloudBlobContainer item in containers)
    {
       container.Add(item.Name);
    }

    //Adding a print statement
    Console.WriteLine(String.Join("\n", container));
    Console.WriteLine("\n");

    return container;
}

GetConfig()

public static StartConfig GetConfig()
{
    StartConfig config = new StartConfig();

    // Retrieve storage account from connection string.
   config.StorageAccount = CloudStorageAccount.Parse(CloudConfigurationManager.GetSetting("StorageConnectionString"));

    // Create the blob object.
    config.BlobClient = config.StorageAccount.CreateCloudBlobClient();


    //Get a reference to a container to use for the sample code, and create it if it does not exist.
    config.Container = config.BlobClient.GetContainerReference(//List of Container names which are returned from ListContainer());

    //Create the container if it does not exisit.
    config.Container.CreateIfNotExists();

    return config;
}

我只想简单地将方法ListContainer()称为var test = ListContiner(null)，并将其放在GetConfig()中。当我这样做的时候，我会得到一个StackOverflowException。这是因为ListContainer正在检查以确保config不是null，然后运行GetConfig()并将其分配给配置。如果有人对如何简单地在GetConfig()中填充来自ListContainers()的容器列表有任何想法，那就太棒了！

Answer 1

当您将var test = ListContainer(null)放入GetConfig方法中时，每当您调用GetConfig时，它都会调用ListContainer(null)，这将检查config == null是否并再次调用GetConfig，从而抛出StackOverflowException。

你必须设法打破这个循环。我的建议是，不要在ListContainer中调用ListContainer，而是需要将一个config传递给它，并在调用者不调用的情况下设置一个保护机制来保护自己。

public static List<string> ListContainer(StartConfig config)
{
    if (config == null)
        throw new ArgumentNullException("config");
    if (config.BlobClient == null)
        throw new ArgumentException("BlobClient must not be null", "config");

    List<string> container = new List<string>();

    //Get the list of the blob from the above container
    IEnumerable<CloudBlobContainer> containers = config.BlobClient.ListContainers();

    foreach (CloudBlobContainer item in containers)
    {
       container.Add(item.Name);
    }

    //Adding a print statement
    Console.WriteLine(String.Join("\n", container));
    Console.WriteLine("\n");

    return container;
}

您还将更改GetConfig方法以调用传递config的ListContainer

public static StartConfig GetConfig()
{
    StartConfig config = new StartConfig();

    // Retrieve storage account from connection string.
    config.StorageAccount = CloudStorageAccount.Parse(CloudConfigurationManager.GetSetting("StorageConnectionString"));

    // Create the blob object.
    config.BlobClient = config.StorageAccount.CreateCloudBlobClient();

    var containers = ListContainer(config);

    //Get a reference to a container to use for the sample code, and create it if it does not exist.
    config.Container = config.BlobClient.GetContainerReference(//List of Container names which are returned from ListContainer());

    //Create the container if it does not exisit.
    config.Container.CreateIfNotExists();

    return config;
}