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在选项卡之间切换时，每当我tabCurves在初始输入后的任何时候输入控件时，都会System.IO.FileLoadException在 line 处抛出a lstCurves_SelectedIndexChanged(Nothing, EventArgs.Empty)。这对我来说完全莫名其妙，因为我有另一个 sub ( tabNURBS_Enter(...)) 具有几乎相同的代码，但不会引发任何异常。

这里发生了什么？

代码：


Private Sub tabCurves_Enter(ByVal sender As Object, ByVal e As System.EventArgs) Handles tabCurves.Enter
    ' See if the tab enter event is marked to be supressed...
    If tabMain.Tag Is tabMain Then _
        Exit Sub

    With lstCurves.Items
        ' Remove old entries.
        .Clear()

        ' Add new curves.
        For I As Integer = 0 To m_NIS.Curves.Count - 1
            .Add(m_NIS.Curves(I).Name)
        Next I
    End With

    ' Update selection.
    lstCurves_SelectedIndexChanged(Nothing, EventArgs.Empty)
End Sub

Private Sub lstCurves_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles lstCurves.SelectedIndexChanged
    If lstCurves.SelectedIndex = -1 Then
        ' Since no curve is selected, disable all UI controls except the add button.
        ' ### code snipped ###

        ' Reset fields.
        ' ### code snipped ###
    Else
        ' Since a curve is selected, enable all UI controls.
        ' ### code snipped ###

        ' Update the fields.
        ' ### code snipped ###

        ' Force update of slider.
        sldCURVKeyframes_ValueChanged(Nothing, EventArgs.Empty)
    End If
End Sub

Private Sub sldCURVKeyframes_ValueChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles sldCURVKeyframes.ValueChanged
    ' Enable\Disable controls depending upon whether the slider is enabled or not.
    ' ### code snipped ###
End Sub

Private Sub tabNURBS_Enter(ByVal sender As Object, ByVal e As System.EventArgs) Handles tabNURBS.Enter
    ' See if the tab enter event is marked to be supressed...
    If tabMain.Tag Is tabMain Then _
        Exit Sub

    With lstNURBS.Items
        ' Remove old entries.
        .Clear()

        ' Add new curves.
        For I As Integer = 0 To m_NIS.BSplines.Count - 1
            .Add(m_NIS.BSplines(I).Name)
        Next I
    End With

    ' Update selection.
    lstNURBS_SelectedIndexChanged(Nothing, EventArgs.Empty)
End Sub

Private Sub lstNURBS_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles lstNURBS.SelectedIndexChanged
    If lstNURBS.SelectedIndex = -1 Then
        ' Since no curve is selected, disable all UI controls except the add button.
        ' ### code snipped ###

        ' Reset fields.
        ' ### code snipped ###
    Else
        ' Since a curve is selected, enable all UI controls.
        ' ### code snipped ###

        ' Update the fields.
        ' ### code snipped ###

        ' Force update of sliders.
        sldNURBSCtlPoints_ValueChanged(Nothing, EventArgs.Empty)
        sldNURBSKnots_ValueChanged(Nothing, EventArgs.Empty)
    End If
End Sub

Private Sub sldNURBSCtlPoints_ValueChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles sldNURBSCtlPoints.ValueChanged
    ' Enable\Disable controls depending upon whether the slider is enabled or not.
    ' ### code snipped ###

    ' Update fields.
    ' ### code snipped ###
End Sub

Private Sub sldNURBSKnots_ValueChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles sldNURBSKnots.ValueChanged
    ' Enable\Disable controls depending upon whether the slider is enabled or not.
    ' ### code snipped ###

    ' Update fields.
    ' ### code snipped ###
End Sub

根据下面 Adrian 的评论，我决定窥探lstCurves_SelectedIndexChanged并注释掉所有代码并减慢未注释的每一行，直到我发现问题（下面以粗体显示）。


Private Sub lstCurves_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles lstCurves.SelectedIndexChanged
    If lstCurves.SelectedIndex = -1 Then
        ' Since no curve is selected, disable all UI controls except the add button.
        btnCURVRemove.Enabled = False
        btnCURVRename.Enabled = False

        ' Reset fields.
        txtCURVPreInfinity.Text = ""
        txtCURVPostInfinity.Text = ""

        sldCURVKeyframes.Enabled = False
        sldCURVKeyframes.Value = 0
        sldCURVKeyframes.Maximum = 0
    Else
        ' Since a curve is selected, enable all UI controls.
        btnCURVRemove.Enabled = True
        btnCURVRename.Enabled = True

        ' Update the fields.
        With m_NIS.Curves(lstCurves.SelectedIndex)
            txtCURVPreInfinity.Text = .PreInfinity
            txtCURVPostInfinity.Text = .PostInfinity
            sldCURVKeyframes.Enabled = True
            sldCURVKeyframes.Maximum = .Keyframes.Count - 1
            sldCURVKeyframes.Value = 0
        End With

        ' Force update of slider.
        sldCURVKeyframes_ValueChanged(Nothing, EventArgs.Empty)
    End If
End Sub

Keyframes是 type IList(Of Keyframe)，它实际上是一个属性，它返回一个类型的内部列表EventList(Of T) Implements IList(Of T)到 type的强制转换IList(Of Keyframe)。EventList(Of T)是一个包装器，当项目被添加、插入、移除、即将被移除、修改或列表被清除或即将被清除时抛出事件。

这会导致我遇到的问题吗？

这是定义 m_NIS 和动画曲线对象的相关文件。下载

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1 回答 1

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遵循使用 app.config 文件并添加了推荐的 xml 代码的建议修复：

<startup useLegacyV2RuntimeActivationPolicy="true">
  <supportedRuntime version="v4.0" />
</startup>
于 2013-05-22T23:54:00.217 回答