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[英]Retain controls and properties generated in SelectedIndexChanged
[英]SelectedIndexChanged Not Firing in WinForms for Controls Generated at Runtime
我的额头因撞到我的桌子上的桌子而被撞伤。
我有一个窗体,该窗体根据传递给它的参数生成一堆自定义UserControl(FieldMapper对象)。 FieldMapper UserControl本质上只是组织在TableLayoutPanel上的几个标签,一个BindingSource和一个ComboBox(绑定到BindingSource)。 此UserControl上的ComboBox设置为DropDownList,并绑定到BindingSource,该绑定源在构造时使用作为参数传递的IList进行填充。
FieldMapper有一个称为MappingChanged的事件,该事件在底层的SelectedIndexChanged事件被触发时触发,并且某些逻辑确定随该事件一起触发的MappingChangedEventArgs的参数。 这用于从其他组合框中删除/添加项目,因此在FieldMapping控件系列中不能两次选择任何内容
问题在于, 只有一个控件会触发基础的SelectedIndexChanged事件。 这个控件是我首先更改的任何控件,它是ComboBox的选定值/索引。 尽管选择了其他控件的组合框,但选择哪个控件都没有关系,但只有该控件将触发后续事件。
这是FieldMapper的构造函数(已删除的与问题无关的参数)
public FieldMapper(IList<string> fields)
{
InitializeComponent();
fields = fields.OrderBy(s => s).ToList();
string[] copyBuffer = new string[fields.Count + 1];
fields.CopyTo(copyBuffer, 1);
copyBuffer[0] = "NONE";
AvailableMappings = new BindingList<string>(copyBuffer.ToList());
AvailableMappings.RaiseListChangedEvents = true;
bindingSource = new BindingSource();
mapSelector.DataSource = bindingSource;
bindingSource.DataSource = AvailableMappings;
mapSelector.SelectedItem = "NONE";
mapSelector.SelectedIndexChanged += mapSelector_SelectedIndexChanged;
}
这些FieldMapper控件的父窗体按如下方式生成它们:
private void BuildMappingTable(IEnumerable<string> fieldNames)
{
int row = 0;
foreach (var field in fbProject.Fields)
{
FieldMapper mapper = new FieldMapper(field.Key, field.Value.FieldName, fieldNames.ToList());
mapper.EnableMappingField = false;
mapper.Anchor = AnchorStyles.Right | AnchorStyles.Left;
mapper.MappingChanged += MappingChanged;
mappingTable.Controls.Add(mapper, 0, row);
row++;
}
if (!built && !original)
SetInitialValues()
built = true;
}
当我在调试此问题时检查断点时,总是为FieldMapper和FieldMapper的comobobox的SelectedIndexChanged事件填充事件处理程序,因此我不确定为什么不触发它们。
编辑:这里要求是mapSelector_SelectedIndexChanged方法
private void mapSelector_SelectedIndexChanged(object sender, EventArgs e)
{
if (currentValue == null || currentValue.Equals("NONE"))
{
currentValue = (string)mapSelector.SelectedItem;
OnMappingChanged(new MappingSelectedEventArgs(MappingSelectedEventArgs.MappingSelectedAction.SET, currentValue));
}
else if (mapSelector.SelectedItem.Equals("NONE"))
{
OnMappingChanged(new MappingSelectedEventArgs(MappingSelectedEventArgs.MappingSelectedAction.REMOVED, currentValue));
currentValue = "NONE";
}
else if (!mapSelector.SelectedItem.Equals(currentValue))
{
OnMappingChanged(new MappingSelectedEventArgs(MappingSelectedEventArgs.MappingSelectedAction.CHANGED, currentValue,
(string)mapSelector.SelectedItem));
currentValue = (string)mapSelector.SelectedItem;
}
}
protected void OnMappingChanged(MappingSelectedEventArgs args)
{
if (MappingChanged != null)
MappingChanged(this, args);
}
更换:
private void mapSelector_SelectedIndexChanged(object sender, EventArgs e)
通过:
private void bindingSource_CurrentChanged(object sender, EventArgs e)
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