Question:
I am trying to access Azure Storage from a console app like this:
CloudStorageAccount storageAccount = CloudStorageAccount.FromConfigurationSetting("myConnectionString"); where the connection string is something like:
DefaultEndpointsProtocol=https;AccountName=XXX;AccountKey=XXX
but i get an exception:
System.Runtime.InteropServices.SEHException was caught Message=External component has thrown an exception. Source=msshrtmi ErrorCode=-2147467259
StackTrace:
at RoleEnvironmentGetConfigurationSettingValueW(UInt16* , UInt16* , UInt64 , UInt64* ) at Microsoft.WindowsAzure.ServiceRuntime.Internal.InteropRoleManager.GetConfigurationSetting(String name, String& ret) at Microsoft.WindowsAzure.ServiceRuntime.RoleEnvironment.GetConfigurationSettingValue(String configurationSettingName) at AzureUpload.Program.<Init>b__2(String configName, Func`2 configSetter) in C:\Users\siddjain\Documents\Visual Studio 2010\Projects\ConsoleAplication1\Program.cs:line 51 at Microsoft.WindowsAzure.CloudStorageAccount.StorageAccountConfigurationSetting..ctor(String configurationSettingName) at Microsoft.WindowsAzure.CloudStorageAccount.FromConfigurationSetting(String settingName) at AzureUpload.Program.UploadBlob(String directory, String searchPattern, String container) in C:\Users\siddjain\Documents\Visual Studio 2010\Projects\ConsoleApplication1\Program.cs:line 87 InnerException
Do I need to start up azure services or something before running my app?
Solution:1
As Steve mentioned, you're trying to retrieve settings from the Azure configuration settings, which don't exist in a console app.
If you want to write your code to run in either non-Azure or Azure environments, you can specify a configuration publisher. When in Azure, it's simply a wrapper. Otherwise, you basically redirect to app.config / web.config.
There's a great CodeProject article that demonstrates this. Here's a code snippet from that article. In essence, you'd specify the configuration publisher in your OnStart method:
CloudStorageAccount.SetConfigurationSettingPublisher( StorageAccountFactory.GetConfigurationSettingPublisher() ); In this case, you'd have a factory method deciding where to store/retrieve config settings, based on whether you're in Azure (RoleEnvironment.IsAvailable):
public static Action<string, Func<string,bool>> GetConfigurationSettingPublisher() { if (RoleEnvironment.IsAvailable) return (configName, configSetter) => configSetter(RoleEnvironment.GetConfigurationSettingValue(configName)); return (configName, configSetter) => configSetter(ConfigurationManager.AppSettings[configName]); }
Solution:2
FromConfigurationSetting uses the role runtime API, which tries to read configuration settings. That will not work when running outside Windows Azure.
Use CloudStorageAccount.Parse("<myConnectionString>") instead. (Or fetch the config setting from app.config or somewhere else and then pass it into Parse()).
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