C#|C# 关于sendtoback()和bringtofront() 的特点说明开发语言|sendtoback|bringtofront|

在开发的时候经常会遇到使用这两种方法，调整控件的顺序，尤其是在自动生成控件的时候。有的时候会感觉不好用，这里提供一个解决方案。
这两个方法必须要在添加控件之后才会好用，范例代码如下：
label lbl=new label();
//属性设定。。。。。
control.add(lbl)；
lbl.bringtofront();
控件置顶：控件名.BringToFront();
控件置底：控件名.SendToBack();
c#子线程和主线程创建窗体时顶层显示的区别
主线程
1.设置TopLevel，Topmost,bringfront属性。
子线程
2.在可在Load事件里注册循环设置TopLevel，Topmost,bringTofront属性的方法，如下
frm.Load += new EventHandler((object ob, EventArgs ee) =>
{
Task.Factory.StartNew(() =>
{
while (true)
{
Thread.Sleep(10);
frm.Invoke(new Action(() =>
{
frm.BringToFront();
frm.TopMost = true;
frm.TopLevel = true;
}));
}

});
});

protected override void DoBuildChildren(LayoutPanelBase Layout) { base.DoBuildChildren (Layout); CaptionLabel.Dock = DockStyle.Top; mode = new ComboBox (); mode.Parent = ParentNotePanel; mode.DropDownStyle = ComboBoxStyle.DropDownList; mode.Dock = DockStyle.Top; mode.BringToFront (); mode.Items.Add (Loc.Instance.GetString ("Notes on This Layout")); mode.Items.Add (Loc.Instance.GetString ("All Layouts")); mode.Items.Add (Loc.Instance.GetString ("Notes on Current Layout")); mode.SelectedIndexChanged += HandleDropDownSelectedIndexChanged; SearchDetails = new Panel (); AdjustDockingOfSearchPanel(); CurrentFilterDropDown = new ComboBox (); CurrentFilterDropDown.Dock = DockStyle.Bottom; // because we need the tables to be loaded we CANNOT load this data now LayoutDetails.Instance.UpdateAfterLoadList.Add (this); TextEditor = new ComboBox (); TextEditor.Dock = DockStyle.Bottom; TextEditor.KeyPress += HandleTextEditKeyPress; TextEditor.KeyUp += HandleKeyUp; // Do some cleanup on history item to keep the list reasonable. // This happens only on load to keep things simple if (History.Count > 10) { History.RemoveRange(9, (History.Count)-9); }foreach (string s in History) { TextEditor.Items.Add (s); }TextEditor.SelectedIndexChanged+= (object sender, EventArgs e) =>Refresh (); ; FullTextSearch = new CheckBox(); FullTextSearch.Checked = false; FullTextSearch.Text = Loc.Instance.GetString ("Search All Text Fields"); FullTextSearch.Dock = DockStyle.Bottom; SearchDetails.Controls.Add (TextEditor); SearchDetails.Controls.Add (CurrentFilterDropDown); SearchDetails.Controls.Add (FullTextSearch); list = new ListBox(); //list.SelectedIndexChanged += HandleDropDownSelectedIndexChanged; list.Parent = ParentNotePanel; list.Width = 125; list.Dock = DockStyle.Fill; list.BringToFront(); list.BindingContextChanged+= HandleBindingContextChanged; list.DoubleClick += HandleListBoxDoubleClick; list.Click+= HandleNoteListClick; ParentNotePanel.Controls.Add (SearchDetails); count = new Label(); count.Parent = ParentNotePanel; count.Dock = DockStyle.Bottom; blurb = new Label(); blurb.Parent = ParentNotePanel; blurb.Dock = DockStyle.Bottom; refresh = new Button(); refresh.Text = Loc.Instance.GetString("Refresh"); refresh.Dock = DockStyle.Bottom; refresh.Parent = ParentNotePanel; refresh.Click += HandleRefreshClick; //Menu StuffTokenItem = new ToolStripMenuItem(Loc.Instance.GetString("Dock on Bottom?")); TokenItem.CheckOnClick = true; TokenItem.Click += (object sender, EventArgs e) => { searchDetailsDock = (sender as ToolStripMenuItem).Checked; AdjustDockingOfSearchPanel(); this.SetSaveRequired(true); }; if (searchDetailsDock) TokenItem.Checked = true; else TokenItem.Checked= false; properties.DropDownItems.Add (new ToolStripSeparator()); properties.DropDownItems.Add (TokenItem); // AdjustHeightOfLayoutSearchPanel (); This already gets called when the note type is chosen }

如下的代码:
button2.Dock =DockStyle.Top; button1.Send ToBack();
button1.Dock = DockStyle.Top; button3.Dock = DockStyle.Bottom;
pulon3.vOCK -ocKolyie.Douom,
运行后，3个button的顺序始终为:
button1
button2
button3
如果代码改为:
button2.Dock = DockStyle.Top;
button1.Dock = DockStyle.Top;
button3.Dock = DockStyle.Bottom;
运行后，3个button 的顺序始终为:
button2
button1
button3

【C#|C# 关于sendtoback()和bringtofront() 的特点说明】Z顺序指的是:在 Windows中桌面以及Form都是二维的，也就是×和丫轴，那么Z轴在哪里呢?
其实，Z轴就是垂直于桌面和 Form的方向，这个方向上的排列就叫Z顺序。
Windows窗体的Z顺序就是桌面上所有窗口的在Z轴上的排列;
而控件的Z顺序则是控件所在的父容器上的所有控件的在该父容器得的Z轴上的排列;
.NET中，控件的Dock 属性是将控件做×和Y方向上的排列。这个属性设置后，排列的先后顺序，是与控件被加载的顺序有关的控件的SendToBack 和 BringToFront两个方法，就是用来改变Z方向上的排列顺序的，简单说就是控件或者Form在其父容器或桌面上的叠放层次。所以他们不是用来改变在×和Y方向上的排列的。
要想改变那三个Button的前后顺序，可以在解决方案管理器中找到它所在的窗体，然后点击窗体节点前面的+号，将节点展开，然后双击“你的窗体名称.Designer.cs"打开窗体设计文件来修改调整这三个按钮被Controls.Add(...)的先后顺序，即可达到改变Dock 上下顺序.目的。