C# 获取填充了数据源的 ComboBox 的项目
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Getting the items of a ComboBox with its DataSource filled
提问by
Consider that there is a ComboBox which is populated through its DataSource property. Each item in the ComboBox is a custom object and the ComboBox is set with a DisplayMemberand ValueMember.
考虑有一个通过其 DataSource 属性填充的 ComboBox。ComboBox 中的每个项目都是一个自定义对象，并且 ComboBox 使用DisplayMember和 进行设置ValueMember。
IList<CustomItem> aItems = new List<CustomItem>();
//CustomItem has Id and Value and is filled through its constructor
aItems.Add(1, "foo");
aItems.Add(2, "bar");
myComboBox.DataSource = aItems;
Now the problem is that, I want to read the items as string that will be rendered in the UI. Consider that I don't know the type of each item in the ComboBox (CustomItemis unknown to me)
现在的问题是，我想将项目作为将在 UI 中呈现的字符串读取。考虑到我不知道 ComboBox 中每个项目的类型（我不知道CustomItem）
Is this possible ?
这可能吗 ？
回答by Steven Evers
Binding:
捆绑：
ComboBox1.DataSource = aItems;
ComboBox1.DisplayMember = "Value";
Getting the item:
获取物品：
CustomItem ci = ComboBox1.SelectedValue as CustomItem;
edit: If all that you want to get is a list of all of the display values of the combobox
编辑：如果您想要获得的只是组合框所有显示值的列表
List<String> displayedValues = new List<String>();
foreach (CustomItem ci in comboBox1.Items)
displayedValues.Add(ci.Value);
回答by Mitch Wheat
回答by Henk Holterman
You should be able to get at ValueMember and DisplayMember through reflection. But interrogating the combobox might be a little easier. The following will work, but maybe you want to surround it with SuspendUpdate or something.
您应该能够通过反射获得 ValueMember 和 DisplayMember。但是询问组合框可能更容易一些。以下将起作用，但也许您想用 SuspendUpdate 或其他东西包围它。
string s = string.Empty;
int n = comboBox1.Items.Count;
for (int i = 0; i < n; i++)
{
comboBox1.SelectedIndex = i;
s = s + ';' + comboBox1.Text; // not SelectedText;
}
回答by Zack
Although slightly more computationally expensive, Reflection could do what you want:
尽管计算成本稍高，反射可以做你想做的事：
using System.Reflection;
private string GetPropertyFromObject(string propertyName, object obj)
{
PropertyInfo pi = obj.GetType().GetProperty(propertyName);
if(pi != null)
{
object value = pi.GetValue(obj, null);
if(value != null)
{
return value.ToString();
}
}
//return empty string, null, or throw error
return string.Empty;
}
