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FindControl返回错误的控件?

vb.net asp.net .net

2

Achilles · 技术社区 · 15 年前

FindControl 返回的控件与我搜索的Id不完全匹配。parentcontrol中有两个具有类似ID的控件,如:“MyControl”和“MyControlAlternate”。当我打电话的时候 find控件 (“MyControl”)返回的控件是“MyControlAlternate”。 find控件 .

1 回复 | 直到 15 年前

1

NightOwl888 Jabrwoky 15 年前

FindControl的默认行为是使用自己的命名容器。如果不起作用,它会尝试对名称进行模式匹配。这就解释了为什么您得到了错误的控件—您的命名容器不正确,代码正在进入模式匹配阶段。

以下是FindControl与Reflector的分解:

Public Overridable Function FindControl(ByVal id As String) As Control
    Return Me.FindControl(id, 0)
End Function

Protected Overridable Function FindControl(ByVal id As String, ByVal pathOffset As Integer) As Control
    Dim str As String
    Me.EnsureChildControls
    If Not Me.flags.Item(&H80) Then
        Dim namingContainer As Control = Me.NamingContainer
        If (Not namingContainer Is Nothing) Then
            Return namingContainer.FindControl(id, pathOffset)
        End If
        Return Nothing
    End If
    If (Me.HasControls AndAlso (Me._occasionalFields.NamedControls Is Nothing)) Then
        Me.EnsureNamedControlsTable
    End If
    If ((Me._occasionalFields Is Nothing) OrElse (Me._occasionalFields.NamedControls Is Nothing)) Then
        Return Nothing
    End If
    Dim anyOf As Char() = New Char() { "$"c, ":"c }
    Dim num As Integer = id.IndexOfAny(anyOf, pathOffset)
    If (num = -1) Then
        str = id.Substring(pathOffset)
        Return TryCast(Me._occasionalFields.NamedControls.Item(str),Control)
    End If
    str = id.Substring(pathOffset, (num - pathOffset))
    Dim control2 As Control = TryCast(Me._occasionalFields.NamedControls.Item(str),Control)
    If (control2 Is Nothing) Then
        Return Nothing
    End If
    Return control2.FindControl(id, (num + 1))
End Function