AWS中的SQS收發message時，有幾點需要注意：
1.message可以有參數，參數的類型鎖定在“Binary”，“Number”，“String”三類。
2.message的參數有個數限制，限制在10個（小於或等於10個）。
3.鑒於參數個數限制，他的大小應當也是有限制的（尚未測出）。
4.超過10個參數怎么辦？
將幾個參數合並為dictionary，后轉成binary存儲。
1 Dictionary<string, int> dicIntParat = new Dictionary<string, int>(); 2 dicIntParat["DataDownloadID"] = _dataDownload.DataDownloadID; 3 dicIntParat["CreateUserID"] = _dataDownload.CreateUserID; 4 dicIntParat["TopicClientID"] = _dataDownload.TopicClientID; 5 dicIntParat["ProcessStatusID"] = _dataDownload.ProcessStatusID; 6 MemoryStream msNumber = new MemoryStream(); 7 BinaryFormatter bf = new BinaryFormatter(); 8 bf.Serialize(msNumber, dicIntParat); 9 10 MessageAttributeValue DataDownloadIDValue = new MessageAttributeValue(); 11 DataDownloadIDValue.DataType = "Binary"; 12 DataDownloadIDValue.BinaryValue = msNumber; 13 sendMessageRequest.MessageAttributes["DataDownloadID"] = DataDownloadIDValue;
讀取message時，也相應的將Binary轉換成dictionary后取值。
1 MemoryStream msNumber = new MemoryStream(); 2 BinaryFormatter bf = new BinaryFormatter(); 3 msNumber = result.Messages[i].MessageAttributes["DataDownloadID"].BinaryValue; 4 Dictionary<string, int> dicIntParat = (Dictionary<string, int>)bf.Deserialize(msNumber); 5 6 dd.DataDownloadID = dicIntParat["DataDownloadID"]; 7 dd.CreateUserID = dicIntParat["CreateUserID"]; 8 dd.TopicClientID = dicIntParat["TopicClientID"]; 9 dd.ProcessStatusID = dicIntParat["ProcessStatusID"];