WCF中的自訂類中包括自訂枚舉類型時出錯

現有自訂類型EventLogItem：

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public class EventLogItem
    {
public int EventID
        {
get;
set;
        }
public EventLevel EventType
        {
get;
set;
        }
public string EventTime
        {
get;
set;
        }
public string EventTask
        {
get;
set;
        }
public string EventUser
        {
get;
set;
        }
public string EventSource
        {
get;
set;
        }
public string EventIP
        {
get;
set;
        }
public string EventMessage
        {
get;
set;
        }
    }

自訂枚舉類型EventLevel：

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public enum EventLevel
    {
        Warning,
        Infomation
    }

WCF中定義的函數：

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//sqlCore.getUserLogs()傳回型別為List<EventLogItem>
[OperationContract]
public List<EventLogItem> getLogs()
        {
            SqlCore sqlCore = new SqlCore();
return sqlCore.getUserLogs();
        }

現在用戶端調用WCF服務中的方法：

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protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            SeAdminSvc.SeAdminClient client = new SeAdminSvc.SeAdminClient();
            client.getLogsCompleted+=new EventHandler<SeAdminSvc.getLogsCompletedEventArgs>(client_getLogsCompleted);
            client.getLogsAsync();
        }
private void client_getLogsCompleted(object sender, SeAdminSvc.getLogsCompletedEventArgs e)
        {
            dataGrid.ItemsSource = null;
            dataGrid.AutoGenerateColumns = true;
            dataGrid.ItemsSource = e.Result;
        }

編譯後運行程式，將會收到一個異常：  “e.Result”引發了“System.Reflection.TargetInvocationException”類型的異常

其實這就是由於自訂枚舉類型導致的，如果將自訂枚舉類型換成String類型，問題便可迎刃而解。