0.问题描述
EF生成的model带有导航属性,则json序列化会报循环引用错误,尝试如下
protected void Application_Start()
{
GlobalConfiguration.Configure(WebApiConfig.Register);
////config.Formatters.JsonFormatter.MediaTypeMappings.Add(new System.Net.Http.Formatting.QueryStringMapping("datatype", "json", "application/json"));/*http://www.cnblogs.com/mirrortom/p/5931573.html*/
GlobalConfiguration.Configuration.Formatters.XmlFormatter.SupportedMediaTypes.Clear();//清除xml序列化
//HttpConfiguration config = GlobalConfiguration.Configuration;
////config.Formatters.JsonFormatter.SerializerSettings.ReferenceLoopHandling = Newtonsoft.Json.ReferenceLoopHandling.Ignore;
//config.Formatters.JsonFormatter.SerializerSettings.PreserveReferencesHandling = Newtonsoft.Json.PreserveReferencesHandling.Objects;
}
均无法解决.经搜索发现可以修改tt模板,给字段添加JsonIgnore特性
1.观察edmx生成的model字段
发现导航属性都是virtual,并且标记有特性[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
2.修改tt模板,添加JsonIgnore特性
找到edmx文件下的.tt文件
搜索[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
并在此行之上添加一行
[Newtonsoft.Json.JsonIgnore]
添加后
3.项目添加NewtonSoftJson.dll的引用并编译
此时controller里直接返回db.Table1.ToList();不会发生循环引用
From:http://www.cnblogs.com/xuejianxiyang/p/6204111.html