EDM4与POCO x WebService [英] EDM4 with POCO x WebService

问题描述

我对此代码有疑问：

我的班级：
公共班级人员（）
{
私人名单<人员> _peopleparent = new List< People>（）;

public virtual int Id {get;组;公共虚拟字符串名称{get;组;公共虚拟int？ ParentId {get;组;公共虚拟人父母{get;组;公共虚拟列表< People> PeopleParent
{
get {return _peopleparent; }集{_peopleparent = value;我的网络服务：公共类PeopleWS：System.Web.Services.WebService
{
ModelContext db = new ModelContext（）;

[WebMethod]
公共列表< People>选择所有（）
{
返回（从db.People中的q选择q）.ToList（）;
}
}

当我的错误执行webservice：
System.InvalidOperationException：生成XML文档时出错。 ---> System.InvalidOperationException：序列化PeopleWS.People类型的对象时检测到循环引用。

解决方案

您可能需要归因于class - 例如

[

DataContractAttribute （IsReference = true ）]

I have a problem with this code:

My class:
public class People()
{
    private List<People> _peopleparent = new List<People>();

    public virtual int Id { get; set; };
    public virtual string Name  { get; set; }
    public virtual int? ParentId { get; set; }
    public virtual People Parent { get; set; }
    public virtual List<People> PeopleParent
    {
        get { return _peopleparent; }
        set { _peopleparent = value; }
    }
}

My webservice:
public class PeopleWS : System.Web.Services.WebService
{
    ModelContext db = new ModelContext();

    [WebMethod]
    public List<People> SelectAll()
    {
        return (from q in db.People select q).ToList();
    }
}

The error when I execute the webservice:
System.InvalidOperationException: There was an error generating the XML document. ---> System.InvalidOperationException: A circular reference was detected while serializing an object of type PeopleWS.People.

解决方案

You may need to attribute your class - e.g.

[

 

DataContractAttribute(IsReference=true)]

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