'无法绑定到新值成员。参数名称：newDisplayMember'。

Question

我在Visual Studio 2010中使用C＃。我有2个组合框从数据库中提取数据。代码看起来像这样：

 cbo1.DisplayMember = "Name"; 
     cbo1.ValueMember = "HROfficeLocationID"; 
     cbo1.DataSource = offices; 
     cbo2.DisplayMember = "Name"; 
     cbo2.ValueMember = "HROfficeLocationID"; 
     cbo2.DataSource = offices; 

我不断收到此异常：'无法绑定到新值成员。参数名称：newDisplayMember'。我四处搜寻，然后重组的代码行，使cbo.DataSource来之前.DisplayMember和.ValueMember。它结束了看起来像这样：

 cbo1.DataSource = offices; 
     cbo1.DisplayMember = "Name"; 
     cbo1.ValueMember = "HROfficeLocationID"; 
     cbo2.DataSource = offices; 
     cbo2.DisplayMember = "Name"; 
     cbo2.ValueMember = "HROfficeLocationID"; 

异常走。只是想我会分享。

Answer 1

我时，我用的是内部类有varialbles“内部”发生这种情况。改变他们为“公共”，它工作得很好。

Answer 2

一些属性的属性也导致此错误像[可浏览（假）]

Answer 3

指定为一个属性，而不是作为在例如一个类的变量，

public class projectData 
{ 
    public string ProjName { get; set; } 
    public string ProjId { get; set; } 
} 


List<projectData> projects = getProjects(); 


lBoxFDTProjects.DataSource = projects; 

lBoxFDTProjects.ValueMember = "ProjId"; 
lBoxFDTProjects.DisplayMember = "ProjName"; 

Answer 4

public class CmbStringItem 
{ 

    public CmbStringItem(string text, string val) 
    { 
     Text = text; 
     Value = val; 
    } 

    private string text; 

    public string Text 
    { 
     get {return text;} 
     set {text = value;} 
    } 
    private string val; 

    [System.ComponentModel.BrowsableAttribute(true)] // must use 
    public string Value 
    { 
     get {return val;} 
     set {val = value;} 
    } 

    public override string ToString() 
    { 
     return Text; 
    } 
} 

---

 List<CmbStringItem> items = new List<CmbStringItem>(); 
     items.Add(new CmbStringItem("Onula", "0")); 
     items.Add(new CmbStringItem("Jedna", "1")); 
     items.Add(new CmbStringItem("Dva", "2")); 
     items.Add(new CmbStringItem("Tri", "3")); 

     this.cmbSklad.DataSource = items; 

     this.cmbSklad.ValueMember = "Value"; 
     this.cmbSklad.DisplayMember = "Text"; 
     this.cmbSklad.SelectedIndex = 0; 

---

//设置Chombobox - 显示vlaue

cmbSklad.SelectedValue = “1”;