c# - Azure 表 : Unable to load one or more of the requested types. 检索 LoaderExceptions 属性以获取更多信息

Question

我收到错误消息“无法加载一种或多种请求的类型”。检索 LoaderExceptions 属性以获取 Func.exe 命令提示符内显示的更多信息。

当我注释掉除 Table Entity 子类之外的所有代码时，我发现了这一点。这是给我一个异常(exception)的代码。

public class RollCallHistoryEntity : TableEntity
{
    public RollCallHistoryEntity() { }

    public RollCallHistoryEntity(RollCallTransaction transaction)
    {
        this.PartitionKey = Convert.ToString(transaction.OrgId);
        this.RowKey = Guid.NewGuid().ToString();

        this.OrgId = transaction.OrgId;
        this.AttendanceId = transaction.AttendanceId;
        this.ActionId = transaction.ActionId;
        this.HappenedOn = transaction.HappenedOn;

public static class Function1
{
    [FunctionName("Function1")]
    public static async Task Run([QueueTrigger("queue-trigger", Connection = "tuxdev_STORAGE")]string myQueueItem, TraceWriter log)
    {
        log.Info($"C# Queue trigger function processed: {myQueueItem}");

        var queueItem = JsonConvert.DeserializeObject<RollCallTransaction>(myQueueItem);
        //var historyTable = await Azure.AzureTable.GetTable(Azure.AzureTable.TABLE_ROLLCALL_HISTORY);
        //var historyEntity = new Azure.Entity.RollCallHistoryEntity(queueItem);
    }
}

不用担心 RollCallProcessor，这是我的旧项目。我用上面的代码重新创建了一个新项目，但仍然有同样的问题。

Answer 1

Is there a way to look at the LoaderException stacktrace.

您可以使用StackTrace类来跟踪项目中的异常。

或者您可以检索 ReflectionTypeLoadException.LoaderException属性以获取有关 LoaderException 的更多信息。

捕获 Code 中的异常:

try
{
  // load the assembly or type
}
catch (Exception ex)
{
  if (ex is System.Reflection.ReflectionTypeLoadException)
  {
    var typeLoadException = ex as ReflectionTypeLoadException;
    var loaderExceptions  = typeLoadException.LoaderExceptions;
  }
}

At the moment, Under Property of the Project, Application -> Target Framework is running in .netStandard 2.0

只有触发器类型中的某些功能可以在 Azure function v2 预览模板中使用:

例如，BlobTrigger 在 v2 中支持良好。您可以尝试操作azure storage。

创建 Azure function v2 预览版:

创建 BlobTrigger:

BlobTrigger 中的代码:

public static class Function1
    {
        [FunctionName("Function1")]
        public static void Run([BlobTrigger("helloworld/{name}", Connection = "AzureWebJobsStorage")]Stream myBlob, string name, TraceWriter log)
        {
            CloudStorageAccount storageAccount = CloudStorageAccount.Parse(
   "storage account connection string");
            CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
            CloudBlobContainer container = blobClient.GetContainerReference("helloworld");
            CloudAppendBlob blob = container.GetAppendBlobReference("log2.txt");
            using (var fileStream = System.IO.File.OpenRead(@"D:\log.txt"))
            {
                blob.UploadFromStreamAsync(fileStream);
            }
            log.Info($"C# Blob trigger function Processed blob\n Name:{name} \n Size: {myBlob.Length} Bytes");
        }

}

BlobTrigger 中的结果:

所以您最好选择兼容的平台版本。更多详情请引用此article .

Azure Functions runtime 2.0 is in preview, and currently not all features of Azure Functions are supported.