【发布时间】：2015-11-13 05:42:52
【问题描述】：
当加载窗口或用户单击按钮时，我想通过 WCF 服务使用数据库中的一些项目填充 Datagrid，但我收到以下消息：
怎么了？
这是我的 WCF 代码：
public IEnumerable<sesizari> getSesizari()
{
try
{
IEnumerable<sesizari> query = from sel in dataP.sesizaris select sel;
return query;
}
catch(FaultException ex)
{
throw ex;
}
}客户端代码：
private void Service_Window_Loaded(object sender, RoutedEventArgs e)
{
try {
GridView gridView = new GridView();
SesizariList.View = gridView;
gridView.Columns.Add(new GridViewColumn
{
Header = "Id Sesizare",
DisplayMemberBinding = new Binding("id_sesizare")
});
gridView.Columns.Add(new GridViewColumn
{
Header = "Titlu",
DisplayMemberBinding = new Binding("titlu"),
});
gridView.Columns.Add(new GridViewColumn
{
Header = "Client",
DisplayMemberBinding = new Binding("client"),
});
SesizariList.ItemsSource = client.getSesizari();
SesizariList.Items.Refresh();
}
catch(Exception ex)
{
MessageBox.Show(ex.Message.ToString());
}
}我已启用跟踪日志记录，问题出在 getSesizari() 方法上，但我不知道出了什么问题...
There was an error while trying to serialize parameter http://tempuri.org/:getSesizariResult.
The InnerException message was 'Type 'System.Data.Entity.DynamicProxies.sesizari_3A8E1D8187ED0306632025D5E2C490F13F4A3E7EF93AFE8F6B9C7DE55AFA8511'
with data contract name sesizari_3A8E1D8187ED0306632025D5E2C490F13F4A3E7EF93AFE8F6B9C7DE55AFA8511:http://schemas.datacontract.org/2004/07/System.Data.Entity.DynamicProxies'
is not expected. Consider using a DataContractResolver or add any types not known statically to the list of known types - for example,
by using the KnownTypeAttribute attribute or by adding them to the list of known types passed to DataContractSerializer.'.
Please see InnerException for more details.【问题讨论】：
-
您的 wcf 服务托管在哪里？可以调试吗？如果是这样，您的请求是否会到达服务器？好像没有。发生这种情况的原因有很多，例如 Web 服务配置问题、网络问题等。附带说明，您需要关闭/处置您的客户端。最好在 using(var client = new MyClient()){//调用服务} 中初始化客户端
-
WCF 服务是本地托管的。我在调试时也看到了这个异常：
Inner Exception: An existing connection was forcibly closed by the remote host at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags) at System.ServiceModel.Channels.SocketConnection.ReadCore(Byte[] buffer, Int32 offset, Int32 size, TimeSpan timeout, Boolean closing) -
你调试了什么？您是否按照我的建议调试了 WCF 服务？
-
我已经调试了客户端和 WCF 服务，我注意到我的查询有问题，因为它显示以下消息：
Results View Function evaluation disabled because a previous function evaluation timed out. You must continue execution to reenable function evaluation.如果我从该表中删除所有数据，则会出现故障异常消失 -
好的。所以现在很明显问题出在您的服务器端。由于服务器端错误，您在客户端看到了之前的异常。希望能帮助您找到根本原因并纠正问题。