为什么Facebook帖子批处理失败，出现GraphBatchException-#0

以下是我使用NuGet:中的C#Facebook SDK 6.8.0测试批处理的代码

var client = new FacebookClient();
client.AppId = application.FacebookAppId;
client.AppSecret = application.FacebookAppSecret;
var batchedRequests = new List<FacebookBatchParameter>();
batchedRequests.Add(new FacebookBatchParameter()
{
    HttpMethod = HttpMethod.Post,
    Path = "2982XXXXXXXXXX001/feed",
    Parameters = new Dictionary<string, object>
    {
        {"access_token", "CAAK9UGtbUaMBAKX..."},
        {"message", "Check out our stuff at Google: " + DateTime.UtcNow.Ticks},
        {"link", "http://www.google.com"}
    }
});
batchedRequests.Add(new FacebookBatchParameter()
{
    HttpMethod = HttpMethod.Post,
    Path = "755XXXXXXXXXX21/photos",
    Parameters = new Dictionary<string, object>
    {
        {"access_token", "CAAK9UGtbUaMBAA6..."},
        {"message", "Lions, oh my! " + DateTime.UtcNow.Ticks},
        {"url", "http://i.imgur.com/DVSsmpa.jpg"}
    }
});
batchedRequests.Add(new FacebookBatchParameter()
{
    HttpMethod = HttpMethod.Post,
    Path = "2982XXXXXXXXXX001/feed", // Same as first
    Parameters = new Dictionary<string, object>
    {
        {"access_token", "CAAK9UGtbUaMBAKX..."}, // Same as first
        {"message", "Check out our stuff at Facebook: " + DateTime.UtcNow.Ticks},
        {"link", "http://www.facebook.com"}
    }
});
var batchedParams = new Dictionary<string, object>();
batchedParams.Add("access_token", defaultPage.PageAccessToken);
dynamic facebookResponse = client.Batch(batchedRequests.ToArray(), batchedParams);

如果我注释掉三个batchedRequest.Add（）调用中的任何一个，它都可以正常工作。

只有当三者都在一起时，它才会断开。

这是我得到的错误：

Unhandled Exception: Facebook.FacebookApiException: (GraphBatchException - #0) Batch parameter must be a JSON array
   at Facebook.FacebookClient.ProcessResponse(HttpHelper httpHelper, String responseString, Type resultType, Boolean containsEtag, IList`1 batchEtags)
   at Facebook.FacebookClient.Api(HttpMethod httpMethod, String path, Object parameters, Type resultType)
   at Facebook.FacebookClient.Post(String path, Object parameters)
   at Facebook.FacebookClient.Post(Object parameters)
   at Facebook.FacebookClient.Batch(FacebookBatchParameter[] batchParameters, Object parameters)
   at FacebookTest.Program.FacebookBatchTest() in c:'Test'Program.cs:line 81
   at FacebookTest.Program.Main(String[] args) in c:'Test'Program.cs:line 23