避免groupBox中所有组合框的SelectedIndexChanged函数在更改其中一个选项时被触发。

问题描述

我通过使用DataSource属性和数据集中的相同数据来填充8个组合框，并为所有这些属性定义了SelectedIndexChanged函数。



现在我的问题是SelectedIndexChanged如果我改变我对任何组合框的选择，所有组合框的功能都会被触发。

I am filling 8 combobox by using their DataSource property with same data from dataset and have defined SelectedIndexChanged function for all of them.

Now my problem is that SelectedIndexChanged function of all the comboboxes get fired if I change my selection for any of the comboboxes.

foreach (var comboBox in panel2.Controls.OfType<ComboBox>())
{
    comboBox.DataSource = ds.Tables[1];
    comboBox.DisplayMember = "FeeName";
    comboBox.ValueMember = "ID";
}

推荐答案

foreach (var comboBox in panel2.Controls.OfType<ComboBox>())
{
    comboBox.DataSource = ds.Tables[1].Copy();
    comboBox.DisplayMember = "FeeName";
    comboBox.ValueMember = "ID";
}

foreach(Control control in panel2.Controls) {
    ComboBox comboBox = control as ComboBox;
    if (comboBox == null) continue;
    comboBox.//... dereference if and do the same thing
    //...
}

-SA

private bool isUpdating = false;

在你负责更新组合框的代码中有一些技巧：

In your code responsible for updating comboboxes do some kind of trick:

private void UpdateDataSources()
{
    isUpdating = true;

    foreach (var comboBox in panel2.Controls.OfType<ComboBox>())
    {
        comboBox.DataSource = ds.Tables[1];
        comboBox.DisplayMember = "FeeName";
        comboBox.ValueMember = "ID";
    }

    isUpdating = false;
}

然后在每个组合框的SelectedIndexChanged中（或者如果共享事件处理程序）插入IF语句：

And then in SelectedIndexChanged of every combobox (or if shared event handler) insert IF statement:

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    if (!isUpdating)
    {
        // Real code goes here
    }
}

在更新ComboBoxes数据源后，请考虑将SelectedIndexItem设置为-1。



我没试过这，但我认为这可以帮助你。让我知道:)）

Consider setting SelectedIndexItem to -1 after updating ComboBoxes datasources.

I didn't tried this but i think that can help you. Let me know :)

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