我要送一个列表我的自定义对象（拨号）到客户端从我的WCF service.This对象有5属性：ID，名称，类型，Individual_avg，Dept_avg。对于ID，名称和类型的值从表中到来，但Individual_avg和dept_avg是从第三方的服务。未来的要求是：

I have to send a List of my custom object("Dial") to the client from my WCF service.This object has 5 properties:Id,Name,Type,Individual_avg,Dept_avg. The values for Id,Name and Type are coming from a table but the Individual_avg and dept_avg are coming from a 3rd party service.The requirement is:

我在30 seconds.That超时调用第三方服务，如果服务时间超过30秒的反应，我必须与只有3个属性获取从表（ID，姓名发送对象，类型）和设置其他2个属性为null。例如，有5个拨号的列表研究。产卵5个线程调用第三方服务来获得2 properties.If获取值2 拨号后发生超时，发送列表与这2 拨号，只有编号，名称和类型设置为其他3拨号设置的所有属性。我有以下的code来实现它。

I have to timeout the call to 3rd party service after 30 seconds.That is,if the service takes more than 30 seconds to respond,I have to send the objects with only the 3 properties fetched from the table(Id,Name,Type) and set the other 2 properties to null. For example,there are 5 Dials in the List. Spawn 5 threads to call the 3rd party service to get the 2 properties.If the timeout occurs after getting the values for 2 Dials,send the List with all properties set for these 2 Dials and only Id,Name and Type set for the other 3 Dials. I have the following code to achieve it.

public DialResponse GetDials(DialRequest req)
{
    DialResponse response = new DialResponse();
    var indiDials = new List<DialDetails>();
    foreach (var c in indiDialIdToShow)
    {
        var indiObj = _repository.FindQueryable<DashboardDial_Tbl>().Where(p => p.DialId == c.DialIdToShow && p.IsActive == true).Select(p => new DialDetails()
            {
                Id = p.DialId,
                Name = p.DialName,
                Type = p.DialType,
             }).SingleOrDefault();
        indiDials.Add(indiObj);
    }
var timeout = 30000; // 30 seconds
var cts = new CancellationTokenSource();
var token = new CancellationToken();
token = cts.Token;
var myOptions = new ParallelOptions { CancellationToken = cts.Token };
using (var t = new Timer(_ => cts.Cancel(), null, timeout, -1))
{
    Parallel.ForEach(indiDials, myOptions, c =>
    {
        DialDetails newDial = c;
        ReadConfig(c.Id, userName, ref newDial);
        //send a reference to the "dial" object and set the 2 properties on the object

     });
 }
response.DialsList = indiDials;
}

private void ReadConfig(string userName,ref DialDetails dialObj)
{
   //call the 3rd party service
   dialObj.Individual_avg = serviceResponse.someValue;
   dialObj.dept_avg = serviceResponse.anotherValue;
}

要测试的超时的功能，我把 Thread.sleep代码（40000）在ReadConfig method.This返回拨号，而不是发送拨号的只有3个属性（ID，名称，类型）设置一个空列表。我应该什么样的变化，使这片code ++工程的按计划？

To test the "timeout" functionality,I put a Thread.Sleep(40000) in "ReadConfig" method.This returns an empty list of "Dials" instead of the sending "Dials" with only 3 properties(Id,Name,Type) set. What changes should I make so that this piece of code works as intended?

推荐答案

ReadConfig 在本地，因此进行修改 indiDials 未更新。你可以将它转换成一个函数返回修改后的项目。样品code：

ReadConfig is performing the modifications locally and thus indiDials is not updated. You can convert it into a function to return the modified item. Sample code:

private DialDetails ReadConfig(string userName,ref DialDetails dialObj)
{
   //call the 3rd party service
   dialObj.Individual_avg = serviceResponse.someValue;
   dialObj.dept_avg = serviceResponse.anotherValue;

   retun dialObj;
}

和从循环调用它使得列表修改

And call it from the loop such that the List is modified:

indiDials[indiDials.IndexOf(newDial)] = ReadConfig(userName, ref newDial);