vb.net窗体失去的简单介绍

vb窗体不见了

当 vb窗体不见了 发生时，一般情况都是被用户不小心关闭了而已，解决方法如下：

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在右上角的工程那里双击对应的窗体即可（毕竟一个程序未必就一个窗体，万一你创建了几百个窗体呢）

VB.NET 窗体内的一个Panel容器失去焦点就自动隐藏

Public Class Form3 按下,显示控件,并获得焦点. Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click TextBox1.Visible = True TextBox1.Focus() End Sub 判断是否获得焦点. Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click If TextBox1.Focused = True Then MessageBox.Show("已经获得焦点了.") Else MessageBox.Show("已经失去焦点了.") End If End Sub 失去焦点后自动陷藏. Private Sub TextBox1_LostFocus(ByVal sender As Object, ByVal e As System.EventArgs) Handles TextBox1.LostFocus TextBox1.Visible = False End Sub End Class

我的vb.net2010项目的窗体设计器没有了怎么办啊，代码都在！求求大家给

PublicClassSimpleCalculatorInheritsSystem.Windows.Forms.Form#Region"Windows窗体设计器生成的代码"PublicSubNew()MyBase.New()'该调用是Windows窗体设计器所必需的。InitializeComponent()'在InitializeComponent()调用之后添加任何初始化EndSub'窗体重写处置以清理组件列表。ProtectedOverloadsOverridesSubDispose(ByValdisposingAsBoolean)IfdisposingThenIfNot(componentsIsNothing)Thencomponents.Dispose()EndIfEndIfMyBase.Dispose(disposing)EndSub'Windows窗体设计器所必需的PrivatecomponentsAsSystem.ComponentModel.IContainer'注意：以下过程是Windows窗体设计器所必需的'可以使用Windows窗体设计器修改此过程。'不要使用代码编辑器修改它。FriendWithEventsLabel1AsSystem.Windows.Forms.LabelFriendWithEventsTextBox1AsSystem.Windows.Forms.TextBoxFriendWithEventsButton1AsSystem.Windows.Forms.ButtonFriendWithEventsButton2AsSystem.Windows.Forms.ButtonFriendWithEventsButton3AsSystem.Windows.Forms.ButtonFriendWithEventsButton4AsSystem.Windows.Forms.ButtonFriendWithEventsButton5AsSystem.Windows.Forms.ButtonFriendWithEventsButton6AsSystem.Windows.Forms.ButtonFriendWithEventsButton7AsSystem.Windows.Forms.ButtonFriendWithEventsButton8AsSystem.Windows.Forms.ButtonFriendWithEventsButton9AsSystem.Windows.Forms.ButtonFriendWithEventsButton10AsSystem.Windows.Forms.ButtonFriendWithEventsButton11AsSystem.Windows.Forms.ButtonFriendWithEventsButton12AsSystem.Windows.Forms.ButtonFriendWithEventsButton13AsSystem.Windows.Forms.ButtonFriendWithEventsButton14AsSystem.Windows.Forms.ButtonFriendWithEventsButton15AsSystem.Windows.Forms.ButtonFriendWithEventsButton16AsSystem.Windows.Forms.ButtonPrivateSubInitializeComponent()Me.Label1=NewSystem.Windows.Forms.LabelMe.TextBox1=NewSystem.Windows.Forms.TextBoxMe.Button1=NewSystem.Windows.Forms.ButtonMe.Button2=NewSystem.Windows.Forms.ButtonMe.Button3=NewSystem.Windows.Forms.ButtonMe.Button4=NewSystem.Windows.Forms.ButtonMe.Button5=NewSystem.Windows.Forms.ButtonMe.Button6=NewSystem.Windows.Forms.ButtonMe.Button7=NewSystem.Windows.Forms.ButtonMe.Button8=NewSystem.Windows.Forms.ButtonMe.Button9=NewSystem.Windows.Forms.ButtonMe.Button10=NewSystem.Windows.Forms.ButtonMe.Button11=NewSystem.Windows.Forms.ButtonMe.Button12=NewSystem.Windows.Forms.ButtonMe.Button13=NewSystem.Windows.Forms.ButtonMe.Button14=NewSystem.Windows.Forms.ButtonMe.Button15=NewSystem.Windows.Forms.ButtonMe.Button16=NewSystem.Windows.Forms.ButtonMe.SuspendLayout()''Label1'Me.Label1.Location=NewSystem.Drawing.Point(16,16)Me.Label1.Name="Label1"Me.Label1.Size=NewSystem.Drawing.Size(48,16)Me.Label1.TabIndex=0Me.Label1.Text="结果："''TextBox1'Me.TextBox1.Location=NewSystem.Drawing.Point(64,8)Me.TextBox1.Name="TextBox1"Me.TextBox1.Size=NewSystem.Drawing.Size(120,21)Me.TextBox1.TabIndex=1Me.TextBox1.Text=""''Button1'Me.Button1.Location=NewSystem.Drawing.Point(200,8)Me.Button1.Name="Button1"Me.Button1.Size=NewSystem.Drawing.Size(56,24)Me.Button1.TabIndex=2Me.Button1.Text="清空"''Button2'Me.Button2.Location=NewSystem.Drawing.Point(48,56)Me.Button2.Name="Button2"Me.Button2.Size=NewSystem.Drawing.Size(24,24)Me.Button2.TabIndex=3Me.Button2.Text="1"''Button3'Me.Button3.Location=NewSystem.Drawing.Point(88,56)Me.Button3.Name="Button3"Me.Button3.Size=NewSystem.Drawing.Size(24,24)Me.Button3.TabIndex=4Me.Button3.Text="2"''Button4'Me.Button4.Location=NewSystem.Drawing.Point(136,56)Me.Button4.Name="Button4"Me.Button4.Size=NewSystem.Drawing.Size(24,24)Me.Button4.TabIndex=5Me.Button4.Text="3"''Button5'Me.Button5.Location=NewSystem.Drawing.Point(48,88)Me.Button5.Name="Button5"Me.Button5.Size=NewSystem.Drawing.Size(24,24)Me.Button5.TabIndex=6Me.Button5.Text="4"''Button6'Me.Button6.Location=NewSystem.Drawing.Point(88,88)Me.Button6.Name="Button6"Me.Button6.Size=NewSystem.Drawing.Size(24,24)Me.Button6.TabIndex=7Me.Button6.Text="5"''Button7'Me.Button7.Location=NewSystem.Drawing.Point(136,88)Me.Button7.Name="Button7"Me.Button7.Size=NewSystem.Drawing.Size(24,24)Me.Button7.TabIndex=8Me.Button7.Text="6"''Button8'Me.Button8.Location=NewSystem.Drawing.Point(48,120)Me.Button8.Name="Button8"Me.Button8.Size=NewSystem.Drawing.Size(24,24)Me.Button8.TabIndex=9Me.Button8.Text="7"''Button9'Me.Button9.Location=NewSystem.Drawing.Point(88,120)Me.Button9.Name="Button9"Me.Button9.Size=NewSystem.Drawing.Size(24,24)Me.Button9.TabIndex=10Me.Button9.Text="8"''Button10'Me.Button10.Location=NewSystem.Drawing.Point(136,120)Me.Button10.Name="Button10"Me.Button10.Size=NewSystem.Drawing.Size(24,24)Me.Button10.TabIndex=11Me.Button10.Text="9"''Button11'Me.Button11.Location=NewSystem.Drawing.Point(48,152)Me.Button11.Name="Button11"Me.Button11.Size=NewSystem.Drawing.Size(24,24)Me.Button11.TabIndex=12Me.Button11.Text="0"''Button12'Me.Button12.Location=NewSystem.Drawing.Point(176,56)Me.Button12.Name="Button12"Me.Button12.Size=NewSystem.Drawing.Size(24,24)Me.Button12.TabIndex=13Me.Button12.Text="+"''Button13'Me.Button13.Location=NewSystem.Drawing.Point(176,88)Me.Button13.Name="Button13"Me.Button13.Size=NewSystem.Drawing.Size(24,24)Me.Button13.TabIndex=14Me.Button13.Text="-"''Button14'Me.Button14.Location=NewSystem.Drawing.Point(176,120)Me.Button14.Name="Button14"Me.Button14.Size=NewSystem.Drawing.Size(24,24)Me.Button14.TabIndex=15Me.Button14.Text="*"''Button15'Me.Button15.Location=NewSystem.Drawing.Point(176,152)Me.Button15.Name="Button15"Me.Button15.Size=NewSystem.Drawing.Size(24,24)Me.Button15.TabIndex=16Me.Button15.Text="/"''Button16'Me.Button16.Location=NewSystem.Drawing.Point(88,152)Me.Button16.Name="Button16"Me.Button16.Size=NewSystem.Drawing.Size(72,24)Me.Button16.TabIndex=17Me.Button16.Text="计算"''SimpleCalculator'Me.AutoScaleBaseSize=NewSystem.Drawing.Size(6,14)Me.ClientSize=NewSystem.Drawing.Size(264,190)Me.Controls.Add(Me.Button16)Me.Controls.Add(Me.Button15)Me.Controls.Add(Me.Button14)Me.Controls.Add(Me.Button13)Me.Controls.Add(Me.Button12)Me.Controls.Add(Me.Button11)Me.Controls.Add(Me.Button10)Me.Controls.Add(Me.Button9)Me.Controls.Add(Me.Button8)Me.Controls.Add(Me.Button7)Me.Controls.Add(Me.Button6)Me.Controls.Add(Me.Button5)Me.Controls.Add(Me.Button4)Me.Controls.Add(Me.Button3)Me.Controls.Add(Me.Button2)Me.Controls.Add(Me.Button1)Me.Controls.Add(Me.TextBox1)Me.Controls.Add(Me.Label1)Me.Name="SimpleCalculator"Me.Text="简单计算器"Me.ResumeLayout(False)EndSub#EndRegionPrivateSubTextBox1_TextChanged(ByValsenderAsSystem.Object,ByValeAsSystem.EventArgs)EndSubPrivateSubTextBox1_TabStopChanged(ByValsenderAsSystem.Object,ByValeAsSystem.EventArgs)EndSubPrivateSubButton2_Click(ByValsenderAsSystem.Object,ByValeAsSystem.EventArgs)HandlesButton2.ClickDimbtnAsButton'按钮类型的变量btn=sender'把产生该事件的按钮对象赋值给btnTextBox1.Text=TextBox1.Text+btn.Text'把该按钮的Text属性值连接到TextBox1中EndSubPrivateSubButton3_Click(ByValsenderAsSystem.Object,ByValeAsSystem.EventArgs)HandlesButton3.ClickDimbtnAsButtonbtn=senderTextBox1.Text+=btn.TextEndSubPrivateSubButton4_Click(ByValsenderAsSystem.Object,ByValeAsSystem.EventArgs)HandlesButton4.ClickDimbtnAsButtonbtn=senderTextBox1.Text+=btn.TextEndSubPrivateSubButton5_Click(ByValsenderAsSystem.Object,ByValeAsSystem.EventArgs)HandlesButton5.ClickDimbtnAsButtonbtn=senderTextBox1.Text+=btn.TextEndSubPrivateSubButton6_Click(ByValsenderAsSystem.Object,ByValeAsSystem.EventArgs)HandlesButton6.ClickDimbtnAsButtonbtn=senderTextBox1.Text+=btn.TextEndSubPrivateSubButton7_Click(ByValsenderAsSystem.Object,ByValeAsSystem.EventArgs)HandlesButton7.ClickDimbtnAsButtonbtn=senderTextBox1.Text+=btn.TextEndSubPrivateSubButton8_Click(ByValsenderAsSystem.Object,ByValeAsSystem.EventArgs)HandlesButton8.ClickDimbtnAsButtonbtn=senderTextBox1.Text+=btn.TextEndSubPrivateSubButton9_Click(ByValsenderAsSystem.Object,ByValeAsSystem.EventArgs)HandlesButton9.ClickDimbtnAsButtonbtn=senderTextBox1.Text+=btn.TextEndSubPrivateSubButton10_Click(ByValsenderAsSystem.Object,ByValeAsSystem.EventArgs)HandlesButton10.ClickDimbtnAsButtonbtn=senderTextBox1.Text+=btn.TextEndSubPrivateSubButton11_Click(ByValsenderAsSystem.Object,ByValeAsSystem.EventArgs)HandlesButton11.ClickDimbtnAsButtonbtn=senderTextBox1.Text+=btn.TextEndSubPrivateSubButton12_Click(ByValsenderAsSystem.Object,ByValeAsSystem.EventArgs)HandlesButton12.ClickDimbtnAsButtonbtn=sender'在文本框的Text属性后连接一个空格、本按钮的Text属性值和一个空格TextBox1.Text=TextBox1.Text+""+btn.Text+""EndSubPrivateSubButton1_Click(ByValsenderAsSystem.Object,ByValeAsSystem.EventArgs)HandlesButton1.ClickTextBox1.Text=""'清空文本框EndSubPrivateSubButton13_Click(ByValsenderAsSystem.Object,ByValeAsSystem.EventArgs)HandlesButton13.ClickDimbtnAsButtonbtn=senderTextBox1.Text=TextBox1.Text+""+btn.Text+""EndSubPrivateSubButton14_Click(ByValsenderAsSystem.Object,ByValeAsSystem.EventArgs)HandlesButton14.ClickDimbtnAsButtonbtn=senderTextBox1.Text=TextBox1.Text+""+btn.Text+""EndSubPrivateSubButton15_Click(ByValsenderAsSystem.Object,ByValeAsSystem.EventArgs)HandlesButton15.ClickDimbtnAsButtonbtn=senderTextBox1.Text=TextBox1.Text+""+btn.Text+""EndSubPrivateSubButton16_Click(ByValsenderAsSystem.Object,ByValeAsSystem.EventArgs)HandlesButton16.Click'发生错误转移到标号“ErrorPro”指定的行去执行错误处理程序OnErrorGoToErrorProDimrAsDecimal'保存计算结果的变量DimtAsString=TextBox1.Text'用于保存文本框中的算术表达式DimspaceAsInteger=t.IndexOf("")'搜索空格位置,如果没有空格，返回值为0'字符串的取子符方法，第二个参数小于0，则将产生错误号为5的异常，即过程参数不正确Dims1AsString=t.Substring(0,space)'通过取子串方法获得第一个运算数DimopAsString=t.Substring(space+1,1)'通过取子串方法获得运算符Dims2AsString=t.Substring(space+3)'通过取子串方法获得第二个运算数Dimarg1,arg2AsIntegerarg1=Val(s1):arg2=Val(s2)SelectCaseopCase"+":r=arg1+arg2Case"-":r=arg1-arg2Case"*":r=arg1*arg2Case"/":r=arg1/arg2CaseElseMsgBox("输入的运算符有误！")ExitSubEndSelectTextBox1.Text=CStr(r)'显示结果ExitSub'退出过程ErrorPro:'错误处理程序块SelectCaseErr.NumberCase6'除数为零时，或运算溢出时的错误号MsgBox("算术运算溢出！",,"溢出提示")TextBox1.Focus()ExitSubCase5'Substring过程的参数不符合要求的错误号MsgBox("必须输入运算符和第二个运算数！",,"运算数少")ExitSubCaseElse'其它情况显示错误号和错误原因MsgBox("错误号为"Err.NumberChr(10)Chr(13)"错误原因："Err.Description)ExitSubEndSelectEndSubEndClass