form 的 Visible 属性和 form.hide() , form.show() 有什么区别？

lwl0606 2008-08-05 01:17:31

VB.NET 2005
form 的 Visible 属性和 form.hide() , form.show() 有什么区别？

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mzhao 2008-08-05

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System.Windows.Forms.Form（Control）的Show()函数代码（由Reflector反编译）：



Public Sub Show()

    Me.Visible = True

End Sub

Hide()函数：



Public Sub Hide()

    Me.Visible = False

End Sub

实际上这两个函数是定义在Control类型里面的，Form仅仅在Visible属性里定义了操作。

LYDF4151 2008-08-05

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楼上正解。

破咖啡罐子 2008-08-05

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show:
显示控件等效于将 Visible 属性设置为 true。在调用 Show 方法之后，只要不调用 Hide 方法，Visible 属性就返回 true 值。

hide:
隐藏控件等效于将 Visible 属性设置为 false。在调用 Hide 方法之后，只要不调用 Show 方法，Visible 属性就返回 false 值。

MSDN上说的，怎么好像我骗你一样……

ms-help://MS.VSCC.v80/MS.MSDN.v80/MS.NETDEVFX.v20.chs/CPref17/html/M_System_Windows_Forms_Control_Hide.htm
ms-help://MS.VSCC.v80/MS.MSDN.v80/MS.NETDEVFX.v20.chs/CPref17/html/M_System_Windows_Forms_Control_Show.htm

wdgphc 2008-08-05

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我认为Hide()后隐藏了,你这时操作别的窗体,一旦Show()后应该立刻在最前面吧.
而Visible=false 后, 你操作别的窗体,当Visible=true 后也不一定能在最前面.

wdgphc 2008-08-05

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MSDN上说

Hide方法: 隐藏控件等效于将 Visible 属性设置为 false。在调用 Hide 方法之后，只要不调用 Show 方法，Visible 属性就返回 false 值。

whoami333 2008-08-05

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应该是form1.visible=false的话，show也看不到。

ejoe313 2008-08-05

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顾名思意

access数据库的链接 private void notifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e) { this.notifyIcon1.Visible = true; base.ShowInTaskbar = false; this.Activate(); this.Show(); base.WindowState = FormWindowState.Normal; } private void Form1_SizeChanged(object sender, EventArgs e) { if (this.WindowState == FormWindowState.Minimized) { this.notifyIcon1.Visible = true; base.ShowInTaskbar = false; base.Hide(); } } private void 还原ToolStripMenuItem_Click(object sender, EventArgs e) { this.notifyIcon1.Visible = true; base.ShowInTaskbar = false; this.Activate(); this.Show(); base.WindowState = FormWindowState.Normal; } private void 关闭ToolStripMenuItem_Click(object sender, EventArgs e) { this.Close(); }

C#窗体在靠近屏幕边时隐藏显示这里只有一部分核心代码 private void notifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e) { this.notifyIcon1.Visible = true; base.ShowInTaskbar = false; this.Activate(); this.Show(); base.WindowState = FormWindowState.Normal; } private void Form1_SizeChanged(object sender, EventArgs e) { if (this.WindowState == FormWindowState.Minimized) { this.notifyIcon1.Visible = true; base.ShowInTaskbar = false; base.Hide(); } } private void 还原ToolStripMenuItem_Click(object sender, EventArgs e) { this.notifyIcon1.Visible = true; base.ShowInTaskbar = false; this.Activate(); this.Show(); base.WindowState = FormWindowState.Normal; } private void 关闭ToolStripMenuItem_Click(object sender, EventArgs e) { this.Close(); }

点餐系统，sql+vb。大家交流 VERSION 5.00 Begin VB.Form 主食 BackColor = &H80000009& Caption = "主食" ClientHeight = 9165 ClientLeft = 450 ClientTop = 1425 ClientWidth = 14400 LinkTopic = "Form7" ScaleHeight = 9165 ScaleWidth = 14400 Begin VB.Timer Timer1 Interval = 800 Left = 4920 Top = 8400 End Begin VB.CommandButton Command1 BackColor = &H00FF00FF& Caption = "返回" DownPicture = "曹道耘3.frx":0000 BeginProperty Font Name = "宋体" Size = 14.25 Charset = 134 Weight = 700 Underline = 0 'False Italic = 0 'False Strikethrough = 0 'False EndProperty Height = 495 Left = 8280 Picture = "曹道耘3.frx":41FA TabIndex = 5 Top = 8400 Visible = 0 'False Width = 1215 End Begin VB.Image Image5 Height = 4410 Left = 4920 Picture = "曹道耘3.frx":8707 Top = 2760 Width = 4455 End Begin VB.Image Image4 Height = 4395 Left = 9840 Picture = "曹道耘3.frx":D393 Top = 4680 Width = 4470 End Begin VB.Image Image3 Height = 4380 Left = 9840 Picture = "曹道耘3.frx":12B42 Top = 120 Width = 4470 End Begin VB.Image Image2 Height = 4380 Left = 120 Picture = "曹道耘3.frx":17B18 Top = 4680 Width = 4455 End Begin VB.Image Image1 Height = 4410 Left = 12

其中具体的代码如下：ＴＥＸＴ１的ＬＯＳＴＦＯＣＵＳ代码： thisform.image2.click() ＩＭＡＧＥ的ＣＬＩＣＫ代码：clear events ＩＭＡＧＥ的ＣＬＩＣＫ代码： czz=allt(thisform.combo1.value) mm=allt(thisform.text1.value) mi=0 n=len(czz) m=len(mm) for i=1 to n mi=mi+asc(substr(czz,i,1))*2.698 endfor for j=1 to m mi=mi+asc(substr(mm,j,1))/1.3 endfor if str(mi,9,4)==str(mima,9,4) ZOOM WINDOW SCREEN Max _screen.visible=.t. thisformset.release do main.mpr else =messagebox("操作者或密码不正确，请重新输入！",16,"提示") endif Formset1的destroy事件中的代码： set classlib to ('tszl') kj=creat('tszl') kj.dock(0) kj.show Formset1的init事件代码： if empt(xm) this.form2.hide

包含有数据库文件 using System.ComponentModel; using System.Data; using System.Data.SqlClient; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace WindowsFormsApplication10 { public partial class Form1 : Form { int id = 0; public Form1() { InitializeComponent(); radioButton1.Checked = true; } private void button1_Click(object sender, EventArgs e) { if(radioButton1.Checked==true) if (IsUserIdentify() == true) { id = 1; Form2 form1 = new Form2(id); form1.Show(); this.Visible = false; } else { MessageBox.Show("用户名或密码错误"); } if (radioButton2.Checked == true) { Form2 form = new Form2(); form.Show(); this.Hide(); } } private void button2_Click(object sender, EventArgs e) { this.Close(); } private void textBox1_TextChanged(object sender, EventArgs e) { } private void domainUpDown1_SelectedItemChanged(object sender, EventArgs e) { } private void domainUpDown2_SelectedItemChanged(object sender, EventArgs e) { } private void domainUpDown1_SelectedItemChanged_1(object sender, EventArgs e) { } private void listBox1_SelectedIndexChanged(object sender, EventArgs e) { } private void domainUpDown1_SelectedItemChanged_2(object sender, EventArgs e) { } private void menuStrip1_ItemClicked(object sender, ToolStripItemClickedEventArgs e) { } private void Form1_Load(object sender, EventArgs e) { } private void radioButton1_CheckedChanged(object sender, EventArgs e) { } private void radioButton2_CheckedChanged(object sender, EventArgs e) { textBox1.Text = "顺港"; textBox2.Text = "123123"; } private void textBox2_TextChanged(object sender, EventArgs e) { } private bool IsUserIdentify() { SqlConnection Conn = new SqlConnection("Data Source=.;Initial Catalog=book;Integrated Security=True"); Conn.Open(); string sql = "SELECT Name,PassWord FROM Admin WHERE Name='" + this.textBox1.Text + "'and PassWord='" + this.textBox2.Text + "'"; SqlCommand Cmd = new SqlCommand(sql, Conn); SqlDataReader reader = Cmd.ExecuteReader(); if (reader.Read()) { return true; } else { return false; } } } }

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