ComboBox.ValueMember和DisplayMember

我该如何设置这个值？ 我有一个DataTable，包含我想在combobox中设置的所有数据，但我无法找到如何设置它。

我试过了

ComboBox1.DataSource = dataTable; ComboBox1.ValueMember = "id"; // --> once hes here, he just jumps out the method ComboBox1.DisplayMember = "name"; 

没有编译错误，警告，没有..只是跳出来！

这是填充DataTable的查询

 "Select * from \"Table\"" 

我检查了调试器并填充了数据表。 列名称是“id”和“name”。 ComboBox是空白的。 我第一次填写它！

Answer 1

您不应按此顺序设置列表框和/或combobox的datasource

 ComboBox1.DataSource = dataTable; ComboBox1.ValueMember = "id"; ComboBox1.DisplayMember = "name"; 

相反，这是正确的顺序：

 ComboBox1.ValueMember = "id"; ComboBox1.DisplayMember = "name"; ComboBox1.DataSource = dataTable; 

注意：设置datasource应该是最后一行。

如果先设置datasource ，则会触发SelectedIndexChanged事件，您可能会收到强制转换错误或其他exception。

Answer 2

  ComboBox1.DataSource= dt; //the data table which contains data ComboBox1.ValueMember = "id"; // column name which you want in SelectedValue ComboBox1.DisplayMember = "name"; // column name that you need to display as text 

Answer 3

他们采取串…

 ComboBox1.ValueMember = "id"; ComboBox1.DisplayMember = "name"; 

Answer 4

 public class ComboDeger { private string yazi; private int deger; public ComboDeger(string stryazi, int strdeger) { this.yazi = stryazi; this.deger = strdeger; } public string yazisi { get { return yazi; } } public int degeri { get { return deger; } } } private void combobox_doldur() { ArrayList ComboDegerleri = new ArrayList(); ComboDegerleri.Add(new ComboDeger("9 : NORMAL", 9)); ComboDegerleri.Add(new ComboDeger("10 : ENGELLİ", 10)); comboBox1.DataSource = ComboDegerleri; comboBox1.DisplayMember = "yazisi"; comboBox1.ValueMember = "degeri"; } private void Form3_Load(object sender, EventArgs e) { con.Open(); combobox_doldur(); // Populate the COMBOBOX using an array as DataSource. } 

Answer 5

我遇到了同样的麻烦。 在我的情况下，SelectedIndexChanged事件触发并只是跳出该方法。 尝试不要使用SelectedIndexChanged事件。 或类似的东西：

 ComboBox1.SelectedIndexChanged -= new System.EventHandler(ComboBox1_SelectedIndexChanged); ComboBox1.DataSource = dataTable; ComboBox1.ValueMember = "id"; ComboBox1.DisplayMember = "name"; ComboBox1.SelectedIndexChanged += new System.EventHandler(ComboBox1_SelectedIndexChanged); 

它对我有用。 =）

Answer 6

使用keyvalue对填充combobox

填充combobox的一种巧妙方法是将数据源设置为键值对列表。 它也可能激发使用存储在某种列表中的数据：

 //Some values to show in combobox string[] ports= new string[3] {"COM1", "COM2", "COM3"}; //Set datasource to string array converted to list of keyvaluepairs combobox.Datasource = ports.Select(p => new KeyValuePair(p, p)).ToList(); //Configure the combo control combobox.DisplayMember = "Key"; combobox.ValueMember = "Value"; combobox.SelectedValue = ports[0]; 

也可以使用以下语法填充数据源：

 ports.Select(p => new { Key = p, Value = p }).ToList(); 

可以使用多个列列表的更多属性名称扩展该技术。

Answer 7

你可以像这样指定

  ComboBox1.ValueMember = "id"; ComboBox1.DisplayMember = "name"; 

Answer 8

 ComboBox1.ValueMember = dataTable.Columns["id"].ColumnsName; // column name which the values are not visible ComboBox1.DisplayMember = dataTable.Columns ["name"].ColumnsName; /* column name that you need to select item by proprity : ComboBox1.SelectedItem; Or you can use easly this : ComboBox1.Text; */ ComboBox1.DataSource= dataTable; //the data table which contains data // and this should be last :)