我正在使用 Microsoft Sync Framework 将 Android 设备上的 Datadictionary 中的详细信息与 SQL Server 同步。最初从 sql server 同步所有数据成功。但是在添加一些数据并单击“同步”按钮后，出现以下错误。你能告诉我有人遇到过这个吗？
[Sync Error]:Error occurs during sync. Please check logs below.
[Upload Change Response Error]: 500 Response: <ServiceError xmlns="http://schemas.datacontract.org/2004/07/Microsoft.Synchronization.Services" xmlns:i="http://www.w3.org/2001/XMLSchema-instance"><ErrorDescription>System.InvalidOperationException
 serverBlob is empty
 at Microsoft.Synchronization.Services.SqlProvider.SqlSyncProviderService.ApplyChanges(Byte[] serverBlob, List`1 entities)
 at Microsoft.Synchronization.Services.UploadChangesRequestProcessor.ProcessRequest(Request incomingRequest)
 at Microsoft.Synchronization.Services.SyncService`1.ProcessRequestForMessage(Stream messageBody)
 
 
 </ErrorDescription></ServiceError>
在下面的代码中，我在单击 Sync 按钮时得到 xmlHttp.status=500
this.sendRequest = function (serviceUri, successCallback, errorCallback, dir) {
TraceObj("[" + dir + " Request]:", serviceUri, this.dataObject());
// Construct HTTP POST request
var xmlHttp = new XMLHttpRequest();
xmlHttp.open("POST", serviceUri);
xmlHttp.setRequestHeader("Accept", "application/json");
xmlHttp.setRequestHeader("Content-Type", "application/json");
// Handle success & error response from server and then callback
xmlHttp.onreadystatechange = function () {
if (xmlHttp.readyState == 4) {
if (xmlHttp.status == 200) {
var res = new SyncFormatter();
if (res.parse(xmlHttp.responseText)) {
TraceObj("[" + dir + " Response]:", serviceUri, res.dataObject());
alert("[" + dir + " Response]:", serviceUri, res.dataObject());
successCallback(res);
return;
}
}
TraceMsg("[" + dir + " Response Error]: ", xmlHttp.status + " Response: " + xmlHttp.responseText);
errorCallback(xmlHttp.responseText);
}
};
xmlHttp.send(this.toString());
};
}