无法在嵌入式 ASPX 代码中引用动态对象

发布于 2024-10-12 02:12:02 字数 1626 浏览 1 评论 0原文

我正在 Page_Init 事件期间创建一个 List 成员变量。我在从 *.aspx 页面中嵌入的 C# 代码引用列表中的对象时遇到问题。该错误是运行时绑定程序异常，显示“'object' 不包含 'JobID' 的定义”。

当调用调试器时，我可以看到 foreach 循环的变量 j 确实有一个名为 JobID 的动态属性，并且它填充了一个 int 值。所以，我的问题是为什么我的嵌入式 C# 代码无法使用动态对象。是否有<%@导入%>？我需要使用动态对象的声明？我尝试添加 <%@ Import namespace="System.Dynamic" %>但这没有帮助。

感谢您的帮助。标记

隐藏代码：

 using System;
    using System.Collections.Generic;
    using System.Linq;
    using Jobbarama.WebCode;
    using DataModel;


    public partial class contact : System.Web.UI.Page
    {
        public List<dynamic> JobList { get; set; }

        protected void Page_Init(object sender, EventArgs e)
        {
            SessionManager mgr = SessionManager.Current;

                using (myEntities context = new myEntities())
                {
                    var qry = from c in context.vjobList
                        where c.CampaignID == mgr.CampaignID
                        select new
                        {
                            c.JobID, c.JobTitle, c.CompanyName, c.InterestDate, c.InterestLevel
                        };

                    JobList = qry.ToList<dynamic>();
                }
            }

        }
    }

ASPX 代码：

<select id='cboJob' name='cboJob' style='width: 150px;'>
   <%foreach (var j in JobList){ %>
      <option value="<%=j.JobID %>"><%=j.JobTitle%> [<%=j.CompanyName%>]</option>
   <%} %>
</select>

原文

I'm creating a List member variable during my Page_Init event. I'm having a problem referencing the objects in the list from my embedded C# code in the *.aspx page. The error is a Runtime Binder Exception that says "'object' does not contain a definition for 'JobID'".

When the debugger is invoked, I can see that the foreach loop's variable j does indeed have a dynamic property named JobID and it's filled with an int value. So, my question is why my embedded C# code can't work with the dynamic object. Is there an <%@ Import %> statement that I need to work with dynamic objects? I tried adding <%@ Import namespace="System.Dynamic" %> but that didn't help.

Thanks for the help.
Mark

Code Behind:

 using System;
    using System.Collections.Generic;
    using System.Linq;
    using Jobbarama.WebCode;
    using DataModel;


    public partial class contact : System.Web.UI.Page
    {
        public List<dynamic> JobList { get; set; }

        protected void Page_Init(object sender, EventArgs e)
        {
            SessionManager mgr = SessionManager.Current;

                using (myEntities context = new myEntities())
                {
                    var qry = from c in context.vjobList
                        where c.CampaignID == mgr.CampaignID
                        select new
                        {
                            c.JobID, c.JobTitle, c.CompanyName, c.InterestDate, c.InterestLevel
                        };

                    JobList = qry.ToList<dynamic>();
                }
            }

        }
    }

ASPX Code:

<select id='cboJob' name='cboJob' style='width: 150px;'>
   <%foreach (var j in JobList){ %>
      <option value="<%=j.JobID %>"><%=j.JobTitle%> [<%=j.CompanyName%>]</option>
   <%} %>
</select>

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甜尕妞 2024-10-19 02:12:02

我猜这可能是由于在不同程序集中使用匿名类和 aspx 后期编译内容而导致的权限问题。

您可以使用impromptu-interface来实现此目的。

using ImpromptuInterface

然后你创建一个接口（我使用动态，因为我不知道你的类型）

interface ISelectJob
 dynamic JobID
 dynamic JobTitle
 dynamic CompanyName
 dynamic InterestDate
 dynamic InterestLevel
}

你的属性应该使用该接口

public List<ISelectJob> JobList { get; set; }

并创建你的列表只需添加 .AllActLike()

JobList = qry.AllActLike<ISelectJob>().ToList();

这应该工作，因为它生成一个轻量级 dlr 代理并将上下文设置为其自身的匿名类，因此它认为它始终具有访问权限，这与使用动态关键字调用不同。

My guess this might be a permission issue due to using an anonymous class and aspx late compiling stuff in different assemblies.

You can use impromptu-interface to make this work.

using ImpromptuInterface

then you make an Interface (I'm using dynamic because i don't know your types)

interface ISelectJob
 dynamic JobID
 dynamic JobTitle
 dynamic CompanyName
 dynamic InterestDate
 dynamic InterestLevel
}

Your Property should use the interface

public List<ISelectJob> JobList { get; set; }

And to create your list just add .AllActLike<ISelectJob>()

JobList = qry.AllActLike<ISelectJob>().ToList();

And this should work, as it generates a lightweight dlr proxy and sets the context to the anonymous class its self so it thinks it always has access, unlike calling with the dynamic keyword.

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