摘要
延续前面「GridView+FormView 示范数据新增/修改/删除(进阶篇:服务器控件)」的文章,文章后记有提及若要达到零程序代码要求,上篇已实作「扩展 CommandField 类别 - Header 加入新增钮」解决其中一个问题。另一个问题就要扩展 TextBox 控件,让 TextBox 可以自行判断 FormView 的 CurrentMode 来决定 TextBox 的启用状态,本文接下来就是来说明如何扩展 TextBox 控件来达到此需求。
TBFormViewModeStatus 类别
首先我们先定义 TBFormViewModeStatus 类别,此类别是用来设定控件在每种 FormViewMode 的状态。TBFormViewModeStatus 类别具有 InsertMode、EditMode、BrowseMode 三个属性,分别用来设定 FormViewMode 为 Insert、Edit、ReadOnly 三种情形时,TextBox 控件的启用状态。
扩展 TBTextBox 控件
接下来就是改写 TextBox 控件,我们继承 TextBox 类别命名为 TBTextBox,加入一个 FormViewModeStatus 属性( TBFormViewModeStatus 型别),用来设定控件在每种 FormViewMode 的状态,例如设定 FormViewModeStatus.InsertMode 可以设定 FormViewMode.Insert 情形时,控件状态为「不设定、启用、不启用」三择一。主要的作法是覆写 OnPreRender 方法,在此方法中去呼叫 DoFormViewModeStatus 方法,自行判断 TextBox 所属 FormView 的 CurrentMode 来决定本身的状态。
使用 TBTextBox 控件
将 TBTextBox 放置 FormView 的 EditItemTemplate(Edit 及 Insert 共享 Template,即 InsertItemTemplate=EditItemTemplate)中,在 TBTextBox 的属性窗口中就可以直接设定 FormViewModeStatus 属性即可。如此就可以不用麻烦的判断 FormView 的 CurrentMode,又要 FindControl 来做相关设定,就可以真正达到零程序代码的要求了。
![](http://files.dotblogs.com.tw/jeff377/0805/TextBoxFormViewMode_119D5/image_thumb.png)
<bee:TBTextBox ID="txtEmployeeID" runat="server" Text='<%# Bind("EmployeeID") %>'>
<FormViewModeStatus InsertMode="Enable" EditMode="Disable" />
</bee:TBTextBox>
延续前面「GridView+FormView 示范数据新增/修改/删除(进阶篇:服务器控件)」的文章,文章后记有提及若要达到零程序代码要求,上篇已实作「扩展 CommandField 类别 - Header 加入新增钮」解决其中一个问题。另一个问题就要扩展 TextBox 控件,让 TextBox 可以自行判断 FormView 的 CurrentMode 来决定 TextBox 的启用状态,本文接下来就是来说明如何扩展 TextBox 控件来达到此需求。
TBFormViewModeStatus 类别
首先我们先定义 TBFormViewModeStatus 类别,此类别是用来设定控件在每种 FormViewMode 的状态。TBFormViewModeStatus 类别具有 InsertMode、EditMode、BrowseMode 三个属性,分别用来设定 FormViewMode 为 Insert、Edit、ReadOnly 三种情形时,TextBox 控件的启用状态。
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''' <summary>
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''' 控件状态列举。
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''' </summary>
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Public Enum EControlStatus
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''' <summary>
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''' 不设定。
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''' </summary>
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NotSet = 0
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''' <summary>
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''' 启用。
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''' </summary>
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Enable = 1
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''' <summary>
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''' 不启用。
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''' </summary>
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Disable = 2
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End Enum
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''' <summary>
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''' 依 FormViewMode 来设定控件状态。
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''' </summary>
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< _
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Serializable(), _
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TypeConverter(GetType(ExpandableObjectConverter)) _
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> _
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Public Class TBFormViewModeStatus
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Private FInsertMode As EControlStatus = EControlStatus.NotSet
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Private FEditMode As EControlStatus = EControlStatus.NotSet
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Private FBrowseMode As EControlStatus = EControlStatus.NotSet
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''' <summary>
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''' 在新增模式(FormViewMode=Insert)的控件状态。
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''' </summary>
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< _
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NotifyParentProperty(True), _
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DefaultValue(GetType(EControlStatus), "NotSet") _
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> _
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Public Property InsertMode() As EControlStatus
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Get
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Return FInsertMode
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End Get
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Set(ByVal value As EControlStatus)
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FInsertMode = value
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End Set
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End Property
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''' <summary>
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''' 在编辑模式(FormViewMode=Edit)的控件状态。
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''' </summary>
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< _
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NotifyParentProperty(True), _
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DefaultValue(GetType(EControlStatus), "NotSet") _
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> _
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Public Property EditMode() As EControlStatus
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Get
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Return FEditMode
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End Get
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Set(ByVal value As EControlStatus)
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FEditMode = value
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End Set
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End Property
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''' <summary>
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''' 在浏览模式(FormViewMode=ReadOnly)的控件状态。
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''' </summary>
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< _
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NotifyParentProperty(True), _
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DefaultValue(GetType(EControlStatus), "NotSet") _
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> _
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Public Property BrowseMode() As EControlStatus
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Get
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Return FBrowseMode
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End Get
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Set(ByVal value As EControlStatus)
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FBrowseMode = value
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End Set
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End Property
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End Class
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扩展 TBTextBox 控件
接下来就是改写 TextBox 控件,我们继承 TextBox 类别命名为 TBTextBox,加入一个 FormViewModeStatus 属性( TBFormViewModeStatus 型别),用来设定控件在每种 FormViewMode 的状态,例如设定 FormViewModeStatus.InsertMode 可以设定 FormViewMode.Insert 情形时,控件状态为「不设定、启用、不启用」三择一。主要的作法是覆写 OnPreRender 方法,在此方法中去呼叫 DoFormViewModeStatus 方法,自行判断 TextBox 所属 FormView 的 CurrentMode 来决定本身的状态。
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Imports System
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Imports System.ComponentModel
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Imports System.Drawing
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Imports System.Web
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Imports System.Web.UI
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Imports System.Web.UI.WebControls
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Imports System.Security.Permissions
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Namespace WebControls
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< _
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Description("文字框控件"), _
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ToolboxData("<{0}:TBTextBox runat=server></{0}:TBTextBox>") _
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> _
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Public Class TBTextBox
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Inherits TextBox
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Private FFormViewModeStatus As TBFormViewModeStatus
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''' <summary>
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''' 依 FormViewMode 来设定控件状态。
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''' </summary>
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''' <value></value>
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''' <returns></returns>
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''' <remarks></remarks>
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< _
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Description("依 FormViewMode 来设定控件状态"), _
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NotifyParentProperty(True), _
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DesignerSerializationVisibility(DesignerSerializationVisibility.Content), _
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PersistenceMode(PersistenceMode.InnerProperty), _
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DefaultValue("") _
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> _
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Public ReadOnly Property FormViewModeStatus() As TBFormViewModeStatus
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Get
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If FFormViewModeStatus Is Nothing Then
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FFormViewModeStatus = New TBFormViewModeStatus
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End If
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Return FFormViewModeStatus
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End Get
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End Property
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''' <summary>
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''' 处理控件状态。
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''' </summary>
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''' <param name="ControlStatus">控件状态。</param>
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Private Sub DoControlStatus(ByVal ControlStatus As EControlStatus)
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Select Case ControlStatus
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Case EControlStatus.Enable
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Me.Enabled = True
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Case EControlStatus.Disable
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Me.Enabled = False
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End Select
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End Sub
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''' <summary>
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''' 依 FormView 的模式来处理控件状态。
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''' </summary>
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Private Sub DoFormViewModeStatus()
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Dim oFormView As FormView
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'若控件置于 FormView 中,则依 FormView 的模式来处理控件状态
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If TypeOf Me.BindingContainer Is FormView Then
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oFormView = DirectCast(Me.BindingContainer, FormView)
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Select Case oFormView.CurrentMode
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Case FormViewMode.Insert
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DoControlStatus(Me.FormViewModeStatus.InsertMode)
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Case FormViewMode.Edit
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DoControlStatus(Me.FormViewModeStatus.EditMode)
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Case FormViewMode.ReadOnly
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DoControlStatus(Me.FormViewModeStatus.BrowseMode)
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End Select
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End If
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End Sub
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''' <summary>
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''' 覆写。引发 PreRender 事件。
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''' </summary>
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Protected Overrides Sub OnPreRender(ByVal e As EventArgs)
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MyBase.OnPreRender(e)
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'依 FormView 的模式来处理控件状态
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DoFormViewModeStatus()
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End Sub
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End Class
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End Namespace
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使用 TBTextBox 控件
将 TBTextBox 放置 FormView 的 EditItemTemplate(Edit 及 Insert 共享 Template,即 InsertItemTemplate=EditItemTemplate)中,在 TBTextBox 的属性窗口中就可以直接设定 FormViewModeStatus 属性即可。如此就可以不用麻烦的判断 FormView 的 CurrentMode,又要 FindControl 来做相关设定,就可以真正达到零程序代码的要求了。
![](http://files.dotblogs.com.tw/jeff377/0805/TextBoxFormViewMode_119D5/image_thumb.png)
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