“myObject的'不包含名为'ID'（不是笔误）的属性 [英] 'myObject' does not contain a property with the name 'ID' (Not a typo)

问题描述

我建立一个ASP.NET C＃网站，我有一个DropDownList，我结合我所创建的对象的列表。结合DropDownList中的code是这样的：

I am building an ASP.NET C# website, and I have a dropdownlist that I am binding to a list of objects that I have created. The code that binds the dropdownlist looks like this:

protected void PopulateDropdownWithObjects(DropDownList dropdownlist, List<myObject>() myObjects)
{
    dropdownlist.DataValueField = "ID";
    dropdownlist.DataTextField = "Name";
    dropdownlist.DataSource = myObjects;  // my code fails here
    dropdownlist.DataBind();
}

然而，当它击中的方法中的3号线，则将引发异常：

However, when it hits the 3rd line within the method, an exception is thrown:

DataBinding: 'myObject' does not contain a property with the name 'ID'.

不过，我可以清楚地看到myObject.ID价值，同时我调试：我可以在即时窗口中访问它，它是公开的，它不是空的，我拼写正确，并用正确的情况：

However, I can clearly see the myObject.ID value while I debug: I can access it in the Immediate window, it's public, it isn't null, and I spelled it correctly and with the proper case:

public class myObject
{
    public int ID;   // see? "ID" is right here!
    public string Name;

    public myObject(
        int id,
        string name
        )
    {
        this.ID = id;
        this.Name = name;
    }
}

还有什么可以引起这个错误？

Is there anything else that can cause this error?

推荐答案

您code就不行，因为 ID 是的字段，不是的属性的

Your code will not work, because ID is a field, not a property.

如果你改变你的类，如下图所示，在code将工作打算：

If you change your class, as shown below, the code will work as intended:

public class myObject
{
    public int ID    // this is now a property
    {
        get;
        set;
    }

    public string Name
    {
        get;
        set;
    }

    public myObject(
        int id,
        string name
        )
    {
        this.ID = id;
        this.Name = name;
    }
}

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