ComboBox问题：无法绑定到新值成员 [英] ComboBox Issue: Cannot bind to new value member

问题描述

我有一个组合框，我创建了一个用户控件（它实际上是由一个标签，组合框和文本框组成）。我试图绑定一个数据集到组合框数据源，但我不断得到一个错误消息在ValueMember / Display成员：

 无法绑定到新的显示成员 -  newdisplay member 
无法绑定到新值成员 - 参数名称：值
  

我认为我已经为用户控件正确编码了一切：

  public partial class ucComboBox：UserControl 
 {
 #region属性（6）
 private bool isEditableReadOnly; 
 private bool ArrVisible; 
 private string _value; 
 private string _name; 
 
 public string value 
 {
 get {return _value; } 
 set {_value = value; } 
} 
 public string name 
 {
 get {return _name; } 
 set {_name = value; } 
} 
} 
  

我还有一些其他属性和事件

$ b

我的代码绑定信息：

c $ c>（（ucComboBox）ctrl）.combobox.DataSource = info;
（（ucComboBox）ctrl）.combobox.ValueMember =radiology_id;
（（ucComboBox）ctrl）.combobox.DisplayMember =radiology_name;

每当它碰到值成员时，它就会爆炸，我得到上述两个错误。我在我的用户控制中缺少什么？似乎对我这应该是工作..（fyi - info数据源包含两列）

我尝试了一堆不同的战术，没有成功。请帮助！

感谢

解决方案

不使用Datatset 。创建将保存ID和名称值的类（设施）。将info更改为列表类型。然后下面的代码工作正常：

  info.Add（new Facilities {ID = dr [other_facility_id]。ToString ），Name = dr [other_facility_name]。ToString（）}）; 
 
（（ucComboBox）ctrl）.combobox.DataSource = new BindingSource（info，null）; // info; 
（（ucComboBox）ctrl）.combobox.ValueMember =ID; 
（（ucComboBox）ctrl）.combobox.DisplayMember =Name; 
  

没有绑定问题。

I'v got a combobox that I created as a user control(it's actually made up of a label, combobox and textbox). I'm trying to bind a dataset to the combobox datasource, but I keep getting an error message on ValueMember/Display member:

Cannot bind to the new display member - newdisplay member
Cannot bind to the new value member - parameter name: value

I thought I had everything coded correctly for the usercontrol:

   public partial class ucComboBox : UserControl
{
    #region Properties (6) 
    private bool isEditableReadOnly;
    private bool ArrVisible;
    private string _value;
    private string _name;

    public string value
    {
        get { return _value ; }
        set { _value = value; }
    }
    public string name
    {
        get { return _name; }
        set { _name = value; }
    }
}

I have a few other properties and events in the usercontrol but they shouldnt be the issue.

My code to bind the info:

  ((ucComboBox)ctrl).combobox.DataSource = info;
  ((ucComboBox)ctrl).combobox.ValueMember = "radiology_id";
  ((ucComboBox)ctrl).combobox.DisplayMember = "radiology_name";

It blows up whenever it hits value member, and i get the two errors stated above. Am I missing something in my user control? Seems to me this should be working.. (fyi - the info datasource does contain the two columns)

I've tried a bunch of different tactics with no success. Please help!

Thanks

解决方案

Moved away from using a Datatset. Created a class("Facilities") that will hold an ID and Name values. Changed "info" to a List type. Then the following code worked just fine:

info.Add(new Facilities { ID = dr["other_facility_id"].ToString(), Name = dr["other_facility_name"].ToString() });

  ((ucComboBox)ctrl).combobox.DataSource = new BindingSource(info, null);//info;
  ((ucComboBox)ctrl).combobox.ValueMember = "ID";
  ((ucComboBox)ctrl).combobox.DisplayMember = "Name";

No issues with binding that.

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