标签: valuemember

我正试图从带有C#的ListBox中获取所有选定的项目ValueMember.

例如:

我有这样一个列表:

ID | Name and Lastname
----------------------
1  | John Something
2  | Peter Something2
3  | Mary Smith

这个结构是我的ListBox的一部分.我用这段代码构建了这个列表框:

private void fill_people_listBox()
{
    this.listBoxPeople.DataSource = db.query("SELECT ....");
    this.listBoxPeople.DisplayMember = "people_name_last";
    this.listBoxPeople.ValueMember = "people_id"; 
}

ListBox已成功填充.当用户想要保存更改时,我将遍历此列表以获取所有选定的项目,但我不需要该项目,我需要ID.

例:

1 | John Something.

忽略John Something,得1,所以我不需要DisplayMember,只需要ValueMember.

为此,我尝试了以下几种方法:

1º

        foreach (ListBox selectedItem in this.listBoxGarantes.SelectedItems)
        {
            selectedItem.ToString(); // just an example, I'm printing this.

        }

2º

        string strItem;

        // insert garantes
        foreach (object selectedItem in this.listBoxGarantes.SelectedItems)
        {
            strItem = selectedItem as String;

            strItem; …

好吧所以我有组合框,而数据源是linq查询的结果

//load QA names
            var qaNames =
                from a in db.LUT_Employees
                where a.position == "Supervisor" && a.department == "Quality Assurance"
                select new { a, Names = a.lastName + ", " + a.firstName };

            cboQASupervisor.DataSource = qaNames;
            cboQASupervisor.DisplayMember = "Names";

我遇到的问题是当我尝试添加下一行代码时

cboQASupervisor.ValueMember = "ID";

我在运行时遇到错误,它无法转换匿名类型.我该如何解决？

更正:错误是:

无法绑定到新值成员.参数名称:value

以下代码更新填充了组合框cmbBox1.

OracleDataAdapter oraAdapter = new OracleDataAdapter(oraCmd);
DataSet oraDataSet = new DataSet();
oraAdapter.Fill(oraDataSet);

cmbBox1.ValueMember = oraDataSet.Tables[0].Columns["Val1"].ToString();

cmbBox1.DisplayMember = oraDataSet.Tables[0].Columns["Disp1"].ToString();
cmbBox1.DataSource = oraDataSet.Tables[0];

我需要帮助来弄清楚如何从cmbBox1中删除几个值.我是否从ValueMember/DisplayMember中删除值,或者有什么方法可以隐藏cmbBox1中的值？请指教

如何编写这样的 C# winforms 代码？

CheckedListBox 项没有“Tag”和“ValueMember”属性。

我知道有很多替代方案。但我需要以这种方式工作。

private void LoadPermissionsToCheckedListBox()
{
    Role selectedRole = (Role)comboBox1.SelectedItem;

    int i = 0;
    foreach (Permission p in selectedRole.PermissionItems)
    {
        checkedListBox1.Items.Add(p);
        checkedListBox1.Items[i].Tag = p;
    }

    checkedListBox1.DisplayMember = "PermissionKey";
    checkedListBox1.ValueMember = "PermissionID";
}

我正在尝试创建 ListBox，其中我将拥有键值对。我从课堂上获得的那些数据是从 getter 那里获得的。

班级：

public class myClass
{
    private int key;
    private string value;

    public myClass() { }

    public int GetKey()
    {
        return this.key;
    }

    public int GetValue()
    {
        return this.value;
    }
}

程序：

private List<myClass> myList;

public void Something()
{
    myList = new myList<myClass>();

    // code for fill myList

    this.myListBox.DataSource = myList;
    this.myListBox.DisplayMember = ??; // wanted something like myList.Items.GetValue()
    this.myListBox.ValueMember = ??; // wanted something like myList.Items.GetKey()
    this.myListBox.DataBind();
}

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