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引发自定义控件LoadPostData方法的必要条件!
时间：2022-06-30 10:22:18 编辑：袖梨 来源：一聚教程网
自定义控件要引发LoadPostData方法，需要包含一个ID为this.UniqueID的控件
可在控件组中加入一个Hidden控件!
writer.Write("")
或者干脆更简单的做法，把submit的name属性设置为me.UniqueID
Imports System.ComponentModel
Imports System.Web.UI
Imports System.Web.UI.WebControls
")> Public Class Login
Inherits System.Web.UI.WebControls.WebControl
Implements IPostBackDataHandler
Public Event CheckError As EventHandler
Private _user As String
Private _pass As String
Public Function LoadPostData(ByVal postDataKey As String, ByVal postCollection As System.Collections.Specialized.NameValueCollection) As Boolean Implements System.Web.UI.IPostBackDataHandler.LoadPostData
_user = CType(postCollection(Me.UniqueID & ":User"), String)
_pass = CType(postCollection(Me.UniqueID & ":Pass"), String)
If _user <> _pass Then
Return True
Else
Return False
End If
End Function
Public Sub RaisePostDataChangedEvent() Implements System.Web.UI.IPostBackDataHandler.RaisePostDataChangedEvent
OnCheckError()
End Sub
Public Sub OnCheckError()
RaiseEvent CheckError(Me, New System.EventArgs())
End Sub
Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)
writer.RenderBeginTag(HtmlTextWriterTag.Table)
writer.RenderBeginTag(HtmlTextWriterTag.Tr)
writer.RenderBeginTag(HtmlTextWriterTag.Td)
writer.Write("用户名：")
writer.RenderEndTag()
writer.RenderBeginTag(HtmlTextWriterTag.Td)
writer.AddAttribute(HtmlTextWriterAttribute.Type, "TextBox")
可在控件组中加入一个Hidden控件!
writer.Write("")
或者干脆更简单的做法，把submit的name属性设置为me.UniqueID
Imports System.ComponentModel
Imports System.Web.UI
Imports System.Web.UI.WebControls
Inherits System.Web.UI.WebControls.WebControl
Implements IPostBackDataHandler
Public Event CheckError As EventHandler
Private _user As String
Private _pass As String
Public Function LoadPostData(ByVal postDataKey As String, ByVal postCollection As System.Collections.Specialized.NameValueCollection) As Boolean Implements System.Web.UI.IPostBackDataHandler.LoadPostData
_user = CType(postCollection(Me.UniqueID & ":User"), String)
_pass = CType(postCollection(Me.UniqueID & ":Pass"), String)
If _user <> _pass Then
Return True
Else
Return False
End If
End Function
Public Sub RaisePostDataChangedEvent() Implements System.Web.UI.IPostBackDataHandler.RaisePostDataChangedEvent
OnCheckError()
End Sub
Public Sub OnCheckError()
RaiseEvent CheckError(Me, New System.EventArgs())
End Sub
Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)
writer.RenderBeginTag(HtmlTextWriterTag.Table)
writer.RenderBeginTag(HtmlTextWriterTag.Tr)
writer.RenderBeginTag(HtmlTextWriterTag.Td)
writer.Write("用户名：")
writer.RenderEndTag()
writer.RenderBeginTag(HtmlTextWriterTag.Td)
writer.AddAttribute(HtmlTextWriterAttribute.Type, "TextBox")
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