webservice使用EF生成的model序列化问题

<#
foreach (var navigationProperty in navigationProperties)
{
if (navigationProperty.ToEndMember.RelationshipMultiplicity == RelationshipMultiplicity.Many)
{
#>
[Newtonsoft.Json.JsonIgnore]
[System.Xml.Serialization.XmlIgnore]
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
<#

使用

DBEntities dc = new DBEntities();
dc.Configuration.ProxyCreationEnabled = false;

var list=dc.News.ToList();

return list;  //此时list可成功序列化

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