[英]ComboBox not updating DataBindings on selected item changed (WinForms)
我有一個綁定到數據源的ComboBox但它不會更新綁定,直到控件失去焦點。 如何在所選項目更改時獲取更新綁定? 在下面的屏幕截圖中,我希望標簽立即更新以反映新的選擇。
一些代碼:
public enum MyEnum
{
First,
Second
}
public class MyData
{
public String Name { get; set; }
public MyEnum MyEnum { get; set; }
}
樣品表格:
public SampleForm()
{
InitializeComponent ();
MyData data = new MyData () { Name = "Single Item" };
this.bindingSource1.DataSource = data;
this.comboBox1.DataSource = Enum.GetValues (typeof (MyEnum));
this.label2.DataBindings.Add ("Text", this.bindingSource1, "MyEnum", true, DataSourceUpdateMode.OnPropertyChanged);
this.comboBox1.DataBindings.Add (new System.Windows.Forms.Binding ("SelectedItem", this.bindingSource1, "MyEnum", true));
this.comboBox1.DataBindings.Add (new System.Windows.Forms.Binding ("SelectedValue", this.bindingSource1, "MyEnum", true));
}
注釋掉SelectedItem版本,並像這樣修改SelectedValue綁定以包含UpdateMode:
this.comboBox1.DataBindings.Add(new Binding(
"SelectedValue",
this.bindingSource1,
"MyEnum",
true,
DataSourceUpdateMode.OnPropertyChanged));
LarsTech解決方案是正確的。 您也可以在設計模式下執行此操作:
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