绑定中的Azure功能表存储违反了类型参数"TElement"的约束

Question

我正在从Azure功能中读取表存储中的数据.我在表存储绑定中创建了HttpTrigger函数.项目正在使用存储包:

"WindowsAzure.Storage": "8.0.0"

和绑定:

{
  "bindings": [
    {
      "authLevel": "anonymous",
      "name": "req",
      "type": "httpTrigger",
      "direction": "in"
    },
    {
      "name": "$return",
      "type": "http",
      "direction": "out"
    },
    {
      "name": "metadataTable",
      "type": "table",
      "direction": "in",
      "tableName": "metadata",
      "connection": "StorageConnectionString",
      "partitionkey": "some_partition_key"
    }
  ],
  "disabled": false
}

拥有模板生成的代码我添加了新参数:

#r "Microsoft.WindowsAzure.Storage"

using System;
using System.Net;
using Microsoft.WindowsAzure.Storage.Table;
using Microsoft.WindowsAzure.Storage;

public static async Task<HttpResponseMessage> Run(HttpRequestMessage req, 
                    IQueryable<MetadataTable> metadataTable, TraceWriter log)
{
.....
}
public class MetadataTable: TableEntity
{
    public MetadataTable():base() { }

    public MetadataTable(string partitionkey, string rowkey):base(partitionkey,rowkey) {}

    public string Data { get; set;  }
}

在保存和运行过程中,我收到编译错误:

Microsoft.Azure.WebJobs.Host:错误索引方法'Functions.HttpTriggerCSharp1'.Microsoft.Azure.WebJobs.Host:GenericArguments [0],'Submission#0 + MetadataTable','Microsoft.Azure.WebJobs.Host.Tables.TableAttributeBindingProvider + TableToIQueryableConverter 1[TElement]' violates the constraint of type 'TElement'. mscorlib: GenericArguments[0], 'Submission#0+MetadataTable', on 'Microsoft.Azure.WebJobs.Host.Tables.TableAttributeBindingProvider+TableToIQueryableConverter1 [TElement]'违反了类型参数'TElement'的约束.

任何人都可以帮我这个或遇到同样的错误？

Answer 1

错误消息看起来有点奇怪,但尝试WindowsAzure.Storage从project.json文件中删除引用.此包由运行时自动引用,如果明确包含它,则会因版本不匹配而出现各种错误.

我从您的代码创建了一个干净的Azure函数,没有包引用,它编译和工作得很好.尝试相同.