我如何在Winforms中关闭当前打开的标签页 [英] How i can close current open tabpage in winforms

问题描述

我如何在winforms中关闭tabcontrol中的当前(打开)选项卡....

解决方案

TabControl公开了一个"SelectedTab"属性，该属性将为您提供当前活动的TabPage.但是，TabPage本身并不公开``Remove方法(它确实公开了Dispose()方法，但我从未尝试使用此方法).

因此，您必须使用TabControl的TabPages集合公开的Remove方法，以及在删除TabControl时使用的方法...除非您一直对其进行引用:它不见了！

如您所知，您可以将TabPage的"Visible"属性设置为"false"，但这无效.因此，要隐藏TabPage，必须将其删除！

以下是一些代码，这些代码将向您展示如何删除当前的TabPage，如何隐藏它，但保留对其的引用以及如何还原隐藏的最后一个TabPage:

1.假设您在WinForm上有一个带有三个按钮的TabControl，''tabControl1".一个隐藏当前选定的TabControl TabPage，并保存对其的引用；一个还原最后一个隐藏的TabPage；并且，一个永久删除TabPage.

2.假设在设计时将RestoreSavedTabButton的Enabled属性的状态设置为False. 私有 int savedTabPageIndex; 私有 无效 HideCurrentTabButton_Click(对象发​​件人，EventArgs e) { // 在这里变得偏执...如果您愿意，则抛出错误... 如果(tabControl1.TabPages.Count == 0 || tabControl1.SelectedTab == 返回; savedTabPage = tabControl1.SelectedTab; savedTabPageIndex = tabControl1.TabPages.IndexOf(savedTabPage); tabControl1.TabPages.Remove(savedTabPage); // 重新启用RestoreSavedTabButton // RestoreSavedTabButton.Enabled = true ; } 私有 无效 RestoreSavedTabButton_Click(对象发​​件人，EventArgs e) { // 在此抛出错误，因为这种情况永远不会发生? 如果(savedTabPage == 空)返回 ; tabControl1.TabPages.Insert(savedTabPageIndex，savedTabPage); // 防止不适当地重复使用RestoreSavedTabButton // RestoreSavedTabButton.Enabled = false ; } 私有 无效 RemoveCurrentTabButton_Click(对象发​​件人，EventArgs e) { // 在这里抛出错误?或禁用按钮，具体取决于? 如果(tabControl1.TabPages.Count == 0 )返回; tabControl1.TabPages.Remove(tabControl1.SelectedTab); }

讨论:这个简单的示例只能还原上一个隐藏的TabPage:如果要隐藏然后还原多个TabPage，则会出现其他问题，因为TabPages集合的索引顺序会发生变化.

...编辑#1 ...

进行细微调整，以适当地设置RestoreSavedTabButton的启用"状态

...结束编辑#1 ...

感谢BillWoodruff ....
还要感谢mjbohn ...

How i can close current (open) tabpage in tabcontrol in winforms....

解决方案

The TabControl exposes a ''SelectedTab property that will give you the current active TabPage. But, the TabPage does not expose a ''Remove method, itself (it does expose a Dispose() method, but I have never tried using this).

So you have to use the Remove method exposed by the TabPages collection of the TabControl, and when a TabControl is removed ... unless you''ve kept a reference to it: it is gone !

As you may know, you can set a TabPage''s ''Visible property to ''false, but that has no effect. So, to hide a TabPage, you must remove it !

Here''s some code that will show you how to remove the current TabPage, how to Hide it, but keep a reference to it, and how to restore the last TabPage hidden:

1. Assume you have a TabControl, ''tabControl1 on a WinForm with three buttons. One Hides the current selected TabControl TabPage, and saves a reference to it; one restores the last hidden TabPage; and, one Removes a TabPage permanently.

2. Assume you set the state of the RestoreSavedTabButton ''Enabled property to ''false at design-time.

private TabPage savedTabPage;

private int savedTabPageIndex;

private void HideCurrentTabButton_Click(object sender, EventArgs e)
{
    // get paranoid here ... throw an error if you wish ...
    if (tabControl1.TabPages.Count == 0 || tabControl1.SelectedTab == null) return;

    savedTabPage = tabControl1.SelectedTab;

    savedTabPageIndex = tabControl1.TabPages.IndexOf(savedTabPage);

    tabControl1.TabPages.Remove(savedTabPage);

    // re-enable the RestoreSavedTabButton
    //
    RestoreSavedTabButton.Enabled = true;
}

private void RestoreSavedTabButton_Click(object sender, EventArgs e)
{
    // throw an error here, since this should never happen ?
    if (savedTabPage == null) return;

    tabControl1.TabPages.Insert(savedTabPageIndex, savedTabPage);

    // prevent inappropriate re-use of the RestoreSavedTabButton
    //
    RestoreSavedTabButton.Enabled = false;
}

private void RemoveCurrentTabButton_Click(object sender, EventArgs e)
{
    // throw an error here ? Or disable the Button, depending ?
    if (tabControl1.TabPages.Count == 0) return;

    tabControl1.TabPages.Remove(tabControl1.SelectedTab);
}

Discussion: this simple example only can restore the last TabPage hidden: if you wanted to hide, and then restore, multiple TabPages, other issues would arise, since the index order of the TabPages collection would be changing.

... edit #1 ...

minor tweaks to appropriately set the Enabled state of the RestoreSavedTabButton

... end edit #1 ...

Thanks BillWoodruff....
and also thanks to mjbohn...

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