VisualStateManager.GoToState返回false，並且可視狀態未更改

Question

我有這個XAML代碼：

       <Button x:Name="btnStartRecord" Visibility="Collapsed">
            <Button.BorderBrush>
                <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                    <GradientStop Color="Black" Offset="0"/>
                    <GradientStop Color="#FFF3883E" Offset="1"/>
                </LinearGradientBrush>
            </Button.BorderBrush>
        </Button>
        <Button x:Name="btnStopRecord" Visibility="Collapsed">
            <Button.BorderBrush>
                <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                    <GradientStop Color="Black" Offset="0"/>
                    <GradientStop Color="#FFF3883E" Offset="1"/>
                </LinearGradientBrush>
            </Button.BorderBrush>
        </Button>

<VisualStateManager.VisualStateGroups>
            <VisualStateGroup x:Name="MainStates">
                <VisualState x:Name="RecordIconState">
                    <Storyboard>
                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="btnStartRecord" Storyboard.TargetProperty="(UIElement.Visibility)">
                            <DiscreteObjectKeyFrame KeyTime="0:0:0" Value="Visible"/>
                            <!--<DiscreteObjectKeyFrame KeyTime="0" Value="Visible"/>-->
                        </ObjectAnimationUsingKeyFrames>
                        <!--<ObjectAnimationUsingKeyFrames Storyboard.TargetName="btnStopRecord" Storyboard.TargetProperty="Visibility">
                            <DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed"/>
                        </ObjectAnimationUsingKeyFrames>-->
                    </Storyboard>
                </VisualState>
                <VisualState x:Name="StopRecordIconState">
                    <Storyboard>
                        <!--<ObjectAnimationUsingKeyFrames Storyboard.TargetName="btnStartRecord" Storyboard.TargetProperty="Visibility">
                            <DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed"/>
                        </ObjectAnimationUsingKeyFrames>-->
                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="btnStopRecord" Storyboard.TargetProperty="Visibility">
                            <DiscreteObjectKeyFrame KeyTime="0" Value="Visible"/>
                        </ObjectAnimationUsingKeyFrames>
                    </Storyboard>
                </VisualState>
                </VisualStateGroup>                
        </VisualStateManager.VisualStateGroups>

然后在“代碼隱藏”中，我在OnLoad / Constructor中調用以下函數：

private void SwitchRecordButtonContent()
    {
        {
            if (m_bRecording)
            {
                //btnStartStopRecord.Content = "StopRecord";
                VisualStateManager.GoToState(this, StopRecordIconState.Name, false);
                VisualState currentState = MainStates.CurrentState;
                Visibility temp = btnStartRecord.Visibility;
            }
            else
            {
                //btnStartStopRecord.Content = "StartRecord";
                bool op = VisualStateManager.GoToState((Button)this.btnStartRecord, RecordIconState.Name, false); // I get this always false
                VisualState currentState = MainStates.CurrentState;
                Visibility temp = btnStartRecord.Visibility;
            }
        }
    }

但是我看不到視覺狀態的變化，也無法弄清楚為什么:(

我做錯了什么嗎？

Answer 1

你在打電話

VisualStateManager.GoToState((Button)this.btnStartRecord, RecordIconState.Name, false); // I get this always false

但基於一瞥，您應該打電話給

VisualStateManager.GoToState(this, RecordIconState.Name, false);

Answer 2

就像上面評論中提到的atomaras一樣，將代碼移到了usercontrol的根目錄，並且可以正常工作:)