c# - ClientContext.ExecuteQuery() 产生连接错误消息

Question

我正在尝试运行ClientContext.ExecuteQuery()，但收到​​以下错误消息：

“底层连接已关闭：预期保持活动的连接已被服务器关闭。” >> “无法从传输连接读取数据：现有连接被远程主机强行关闭。”

我的代码如下：

ClientContext _clientcontext = new ClientContext("<URL of sharepoint site>");
NetworkCredential _cred = new NetworkCredential("userid", "password", "domain");
_clientcontext.Credentials = _cred;
Web _site = _clientcontext.Web;
CamlQuery _query = new CamlQuery();
try
{
    _query.ViewXml = <View><Where><Eq><FieldRef Name=\"Created\"/><Value         Type=\"DateTime\"><Today OffsetDays=\"-4\"/></Value></Eq></Where></View>";
    List _splist = _site.Lists.GetById(new Guid("<GUID>"));
    ListItemCollection _listitems = _splist.GetItems(_query);
    _clientcontext.Load(_listitems);
    _clientcontext.ExecuteQuery();