Hiding and Showing TabPages in tabControl

Question

I am trying to show or hide tabpages as per user choice. If user selects gender male then form for male in a tabpage "male" should be displayed and if user selects female then similar next form should be displayed in next tab "female"

I tried using

tabControl1.TabPages.Remove(...)

and

tabControl1.TabPages.Add(...)

It adds and removes the tabpages but doing so will loose my controls on tabpages too... i can't see them back. what's the problem here?

Answer 1

我认为答案要容易得多.

要隐藏选项卡,您可以使用已经尝试过的方式或使用TabPage本身.

TabControl1.TabPages.Remove(TabPage1) 'Could be male
TabControl1.TabPages.Remove(TabPage2) 'Could be female

ASO

删除TabPage不会破坏它及其上的控件.要再次显示相应的选项卡,只需使用以下代码

TabControl1.TabPages.Insert(0, TabPage1) 'Show male
TabControl1.TabPages.Insert(1, TabPage2) 'Show female

Answer 2

您可以从TabControl.TabPages集合中删除选项卡页面并将其存储在列表中.例如:

    private List<TabPage> hiddenPages = new List<TabPage>();

    private void EnablePage(TabPage page, bool enable) {
        if (enable) {
            tabControl1.TabPages.Add(page);
            hiddenPages.Remove(page);
        }
        else {
            tabControl1.TabPages.Remove(page);
            hiddenPages.Add(page);
        }
    }

    protected override void OnFormClosed(FormClosedEventArgs e) {
        foreach (var page in hiddenPages) page.Dispose();
        base.OnFormClosed(e);
    }

Answer 3

改进Hans Passant的优秀解决方案我决定根据他的解决方案编写扩展方法并添加其他内容.我很惊讶,即使在.NET 4中,这个基本功能还没有修复.

• 将其实现为扩展方法,可以以更透明的方式重用
• 清理方法仅清理正在处理/清理的控件的页面.
• 只要有可能,标签页就会恢复到同一位置.如果您隐藏/显示多个标签页,则并非总是可行.
• 它做了一些错误和参数检查
• 为了使其不可见,它会找到它的父级.在显示时,必须给出它,因为删除选项卡页时Parent属性为null.

public static class TabPageExtensions
{
        private struct TabPageData
        {
            internal int Index;
            internal TabControl Parent;
            internal TabPage Page;

            internal TabPageData(int index, TabControl parent, TabPage page)
            {
                Index = index;
                Parent = parent;
                Page = page;
            }

            internal static string GetKey(TabControl tabCtrl, TabPage tabPage)
            {
                string key = "";
                if (tabCtrl != null && tabPage != null)
                {
                    key = String.Format("{0}:{1}", tabCtrl.Name, tabPage.Name);
                }
                return key;
            }
        }

        private static Dictionary<string, TabPageData> hiddenPages = new Dictionary<string, TabPageData>();

        public static void SetVisible(this TabPage page, TabControl parent)
        {
            if (parent != null && !parent.IsDisposed)
            {
                TabPageData tpinfo;

                string key = TabPageData.GetKey(parent, page);
                if (hiddenPages.ContainsKey(key))
                {
                    tpinfo = hiddenPages[key];
                    if (tpinfo.Index < parent.TabPages.Count)
                        parent.TabPages.Insert(tpinfo.Index, tpinfo.Page); // add the page in the same position it had
                    else
                        parent.TabPages.Add(tpinfo.Page);
                    hiddenPages.Remove(key);
                }
            }
        }

        public static void SetInvisible(this TabPage page)
        {
            if (IsVisible(page))
            {
                TabControl tabCtrl = (TabControl)page.Parent;
                TabPageData tpinfo;
                tpinfo = new TabPageData(tabCtrl.TabPages.IndexOf(page), tabCtrl, page);
                tabCtrl.TabPages.Remove(page);
                hiddenPages.Add(TabPageData.GetKey(tabCtrl, page), tpinfo);
            }
        }

        public static bool IsVisible(this TabPage page)
        {
            return page != null && page.Parent != null; // when Parent is null the tab page does not belong to any container
        }

        public static void CleanUpHiddenPages(this TabPage page)
        {
            foreach (TabPageData info in hiddenPages.Values)
            {
                if (info.Parent != null && info.Parent.Equals((TabControl)page.Parent))
                    info.Page.Dispose();
            }
        }

    }

Answer 4

我更喜欢制作扁平风格的外观： /sf/answers/1763450741/

    tabControl1.Appearance = TabAppearance.FlatButtons;
    tabControl1.ItemSize = new Size(0, 1);
    tabControl1.SizeMode = TabSizeMode.Fixed;

但是每个选项卡页上都会显示一个像素，因此如果删除每个选项卡页的所有文本，那么选项卡在运行时将完全不可见。

    foreach (TabPage tab in tabControl1.TabPages)
    {
        tab.Text = "";
    }

之后，我使用树视图来更改选项卡页面...单击节点。