SelectedIndexChanged在WinForms中运行时生成的控件不触发

本文关键字：控件 WinForms 运行时 SelectedIndexChanged | 更新日期: 2023-09-27 18:16:46

我的额头在这张桌子上撞破了。

我有一个表单，根据传递给它的参数生成一堆自定义UserControls (FieldMapper对象)。FieldMapper UserControl本质上只是几个标签，一个BindingSource和一个组合框(绑定到BindingSource)组织在一个TableLayoutPanel上。这个UserControl上的ComboBox被设置为DropDownList，并被绑定到BindingSource，该BindingSource使用在构造时作为参数传递的illist填充。

FieldMapper有一个名为MappingChanged的事件，每当底层SelectedIndexChanged事件被触发时，该事件就会被触发，并且一些逻辑决定了与事件一起触发的MappingChangedEventArgs的参数。这用于从其他组合框中删除/添加项目，以便在FieldMapping控件系列中没有任何内容可以被选中两次

问题是只有一个控件触发底层SelectedIndexChanged事件。这个控件是我首先改变的任何控件，它是ComboBox的选定值/索引。我选择哪一个并不重要，但只有该控件将触发后续事件，尽管其他控件的组合框已更改。

下面是FieldMapper 的构造函数(删除了与问题无关的参数)

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控件的父窗体生成它们如下:

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;
}

当我在调试这个问题时检查断点时，事件处理程序总是为FieldMapper和FieldMapper的comobobox的SelectedIndexChanged事件填充，所以我不确定为什么它们不触发。

编辑:按要求这里是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);
    }

SelectedIndexChanged在WinForms中运行时生成的控件不触发

Replace:

private void mapSelector_SelectedIndexChanged(object sender, EventArgs e)
由:

private void bindingSource_CurrentChanged(object sender, EventArgs e)
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