vb.net 在 ComboBox 的 ValueMembers 中搜索一个值
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/20414956/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Search ComboBox's ValueMembers for a value
提问by Morteza Bashardoost
I have a ComboBox (myCombo) with following features:
我有一个 ComboBox (myCombo) 具有以下功能：
Index ValueMember DisplayMember
0 11 A
1 34 H
2 36 J
3 85 W
4 99 M
I want to find the index of a ValueMember in the ComboBox.
我想在 ComboBox 中找到 ValueMember 的索引。
myCombo.FindString() searches within the DisplayMembers, But i want to search within the ValueMembers.
myCombo.FindString() 在 DisplayMembers 中搜索，但我想在 ValueMembers 中搜索。
回答by T.S.
Lets pretend that Items in your combo are of unanimous type. Sorry for c# but it is really close to VB
让我们假设您组合中的项目是一致类型的。对不起 c# 但它真的很接近 VB
Setup your combo in constructor:
在构造函数中设置你的组合：
comboBox1.Items.Add(new { Name = "a", Val = 35 });
comboBox1.Items.Add(new { Name = "b", Val = 30 });
comboBox1.Items.Add(new { Name = "c", Val = 256 });
comboBox1.ValueMember = "Val";
comboBox1.DisplayMember = "Name";
Then, on click I am looking for an index of item with value 256:
然后，单击我正在查找值为 256 的项目索引：
private void button1_Click(object sender, EventArgs e)
{
for (int i = 0; i < comboBox1.Items.Count; i++)
{
if ((int)comboBox1.Items[i].GetType().GetProperty("Val").GetValue(comboBox1.Items[i]) = 256)
{
MessageBox.Show("index: " + i.ToString());
}
}
}
Here I am using reflection to get the value of the property of unanimous type. If you know the type of the object you use - it even easier - use DirectCast (this is VB):
这里我使用反射来获取一致类型属性的值。如果你知道你使用的对象的类型 - 更容易 - 使用 DirectCast（这是 VB）：
If DirectCast(comboBox1.Items(i), <known_type>).Val = 256 Then...
Main thing here is that in this line, I get the item property and get its value and compare to supplied value (in VB):
这里的主要内容是，在这一行中，我获取 item 属性并获取其值并与提供的值进行比较（在 VB 中）：
CInt(comboBox1.Items(i).GetType().GetProperty("Val").GetValue(comboBox1.Items(i))) = <your int value>
回答by user2260011
Try this:
尝试这个：
(For index = 0 To comboBox1.Items.Count - 1
comboBox1.SelectedIndex = index
Dim dr As DataRowView = TryCast(Me.BindingContext(comboBox1.DataSource).Current, DataRowView)
If dr(1).ToString() = "your Value" Then
Exit For
End If
Next)
