wpf中类型引用不明确。至少有两个名称空间(“System.Windows”和“System.Windows”)中已出现名为“VisualState

Question

就是字面上的意思，不要图方便了，直接打函数名称，加上他的命名空间
比如MessageBox.Show();
写作System.Windows.Forms.MessageBox.Show();

Answer 1

你敲一遍就知道了，比如timer控件，WPF就有三个，你用的时候就得指定好，好了，我培训去了，回来在说

Answer 2

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                   xmlns:System="clr-namespace:System;assembly=mscorlib"
                        xmlns:cmn="clr-namespace:Common;assembly=TarantulaCommon"
                    xmlns:Microsoft_Windows_Themes="clr-namespace:Microsoft.Windows.Themes;assembly=PresentationFramework.Classic"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/up-compatibility/2006" mc:Ignorable="d"
>
    <cmn:BGConverter x:Key="myBGColor"/>
    <cmn:AlignConverter x:Key="myAlign"/>
    <SolidColorBrush x:Key="DisabledBackgroundBrush" Color="#EEE" />
    <SolidColorBrush x:Key="DisabledBorderBrush" Color="#AAA" />
    <SolidColorBrush x:Key="SelectedBackgroundBrush" Color="#DDD" />
    <SolidColorBrush x:Key="DisabledForegroundBrush" Color="#888" />
    <SolidColorBrush x:Key="WindowBackgroundBrush" Color="#FFF" />
    <SolidColorBrush x:Key="SolidBorderBrush" Color="#888" />
    <Style TargetType="{x:Type Expander}">
        <Setter Property="BorderThickness" Value="1"/>
        <Setter Property="BorderBrush" Value="DarkGray"/>
        <Setter Property="Margin" Value="2,2,2,2"/>
    </Style>    <Style x:Key="ButtonFocusVisual">
        <Setter Property="Control.Template">
            <Setter.Value>
                <ControlTemplate>
                    <Border>
                        <Rectangle SnapsToDevicePixels="true" Stroke="Black" StrokeDashArray="1 2" StrokeThickness="1" Margin="4"/>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
    <!--<Style TargetType="{x:Type DataGrid}">
        <Setter Property="VerticalGridLinesBrush" Value="{StaticResource SolidBorderBrush}"/>
        <Setter Property="HorizontalGridLinesBrush" Value="{StaticResource DisabledBorderBrush}"/>
    </Style>-->
    <Style x:Key="GlassButtonStyle" TargetType="{x:Type Button}">
        <Setter Property="FocusVisualStyle" Value="{StaticResource ButtonFocusVisual}"/>
        <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.ControlBrushKey}}"/>
        <Setter Property="Foreground" Value="#FFFFFFFF"/>
        <Setter Property="BorderBrush" Value="{x:Static Microsoft_Windows_Themes:ClassicBorderDecorator.ClassicBorderBrush}"/>
        <Setter Property="BorderThickness" Value="3"/>
        <Setter Property="HorizontalContentAlignment" Value="Center"/>
        <Setter Property="VerticalContentAlignment" Value="Center"/>
        <Setter Property="Padding" Value="0,0,1,1"/>
        <Setter Property="Height" Value="40" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Button}">
                    <ControlTemplate.Resources>
                        <Storyboard x:Key="Timeline1">
                            <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="grow" Storyboard.TargetProperty="(UIElement.Opacity)">
                                <SplineDoubleKeyFrame KeyTime="00:00:00" Value="0"/>
                                <SplineDoubleKeyFrame KeyTime="00:00:00.2000000" Value="1"/>
                            </DoubleAnimationUsingKeyFrames>
                        </Storyboard>
                        <Storyboard x:Key="Timeline2">
                            <ColorAnimationUsingKeyFrames BeginTime="00:00:00" Duration="00:00:00.0010000" Storyboard.TargetName="grow" Storyboard.TargetProperty="(Panel.Background).(GradientBrush.GradientStops)[1].(GradientStop.Color)">
                                <SplineColorKeyFrame KeyTime="00:00:00" Value="#00FFFFFF"/>
                            </ColorAnimationUsingKeyFrames>
                            <DoubleAnimationUsingKeyFrames BeginTime="00:00:00" Storyboard.TargetName="grow" Storyboard.TargetProperty="(UIElement.Opacity)">
                                <SplineDoubleKeyFrame KeyTime="00:00:00" Value="1"/>
                                <SplineDoubleKeyFrame KeyTime="00:00:00.2000000" Value="0"/>
                            </DoubleAnimationUsingKeyFrames>
                        </Storyboard>
                    </ControlTemplate.Resources>
                    <Border Background="#4C000000" BorderBrush="#FF1351af" BorderThickness="1,1,1,1" CornerRadius="4,4,4,4">
                        <Border Background="#FF1c5cbe" BorderThickness="1,1,1,1" CornerRadius="4,4,4,4">
                            <Grid>
                                <Grid.RowDefinitions>
                                    <RowDefinition Height="0.5*"/>
                                    <RowDefinition Height="0.5*"/>
                                </Grid.RowDefinitions>
                                <Border Opacity="0" Margin="0,0,0,0" x:Name="grow" CornerRadius="4,4,4,4" Grid.RowSpan="2">
                                    <Border.Background>
                                        <RadialGradientBrush>
                                            <RadialGradientBrush.RelativeTransform>
                                                <TransformGroup>
                                                    <ScaleTransform ScaleX="1.995" ScaleY="3.322"/>
                                                    <SkewTransform AngleX="0" AngleY="0"/>
                                                    <RotateTransform Angle="0"/>
                                                    <TranslateTransform X="-0.453" Y="0.1"/>
                                                </TransformGroup>
                                            </RadialGradientBrush.RelativeTransform>
                                            <GradientStop Color="#FF26ECCD" Offset="0.249"/>
                                            <GradientStop Color="#00FFFFFF" Offset="1"/>
                                        </RadialGradientBrush>
                                    </Border.Background>
                                </Border>
                                <Border x:Name="shine" CornerRadius="4,4,0,0">
                                    <Border.Background>
                                        <LinearGradientBrush EndPoint="0.5,2.167" StartPoint="0.5,-3.167">
                                            <GradientStop Color="#FFFFFFFF" Offset="0"/>
                                            <GradientStop Color="#00FFFFFF" Offset="1"/>
                                            <GradientStop Color="#7DFFFFFF" Offset="0.335"/>
                                        </LinearGradientBrush>
                                    </Border.Background>
                                </Border>
                                <ContentPresenter HorizontalAlignment="Center" Margin="0,0,0,0" VerticalAlignment="Center" Grid.RowSpan="2"/>
                            </Grid>
                        </Border>
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsPressed" Value="True">
                            <Setter Property="Visibility" TargetName="grow" Value="Hidden"/>
                            <Setter Property="Opacity" TargetName="shine" Value="0"/>
                        </Trigger>
                        <Trigger Property="IsKeyboardFocused" Value="true"/>
                        <Trigger Property="IsDefaulted" Value="true"/>
                        <Trigger Property="IsPressed" Value="true"/>
                        <Trigger Property="ToggleButton.IsChecked" Value="true"/>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}"/>
                        </Trigger>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Trigger.EnterActions>
                                <BeginStoryboard x:Name="Timeline1_BeginStoryboard" Storyboard="{StaticResource Timeline1}"/>
                            </Trigger.EnterActions>
                            <Trigger.ExitActions>
                                <BeginStoryboard x:Name="Timeline2_BeginStoryboard" Storyboard="{StaticResource Timeline2}"/>
                            </Trigger.ExitActions>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

Answer 3

    <LinearGradientBrush x:Key="NormalBrush" EndPoint="0,1" StartPoint="0,0">
        <GradientStop Color="#EEE" Offset="0.0" />
        <GradientStop Color="#CCC" Offset="1.0" />
    </LinearGradientBrush>    <!-- LightBrush is used for content areas such as Menu, Tab Control background -->
    <LinearGradientBrush x:Key="LightBrush" EndPoint="0,1" StartPoint="0,0">
        <GradientStop Color="#FFF" Offset="0.0" />
        <GradientStop Color="#EEE" Offset="1.0" />
    </LinearGradientBrush>    <LinearGradientBrush x:Key="PressedBorderBrush" EndPoint="0,1" StartPoint="0,0">
        <GradientStop Color="#444" Offset="0.0" />
        <GradientStop Color="#888" Offset="1.0" />
    </LinearGradientBrush>
    <!-- DefaultedBorderBrush is used to show KeyBoardFocus -->
    <LinearGradientBrush x:Key="DefaultedBorderBrush" EndPoint="0,1" StartPoint="0,0">
        <GradientStop Color="#777" Offset="0.0" />
        <GradientStop Color="#000" Offset="1.0" />
    </LinearGradientBrush>
    <!-- This is the thickness setting for most borders -->
    <Thickness x:Key="BorderThickness">1,1,1,1</Thickness>    <!-- Padding value for labels -->
    <Thickness x:Key="LabelPadding">5,8,5,2</Thickness>    <!-- The Background Brush is used as the background for the Headers and Footers-->
    <SolidColorBrush x:Key="BackgroundBrush" Color="#FF323F56" />    <!-- Colors used for the Welcome Header -->
    <LinearGradientBrush x:Key="WelcomeBackgroundBrush" StartPoint="0.132488,0.500228" EndPoint="1,0.500228">
        <GradientStop Color="#FFF1F8FC" Offset="0" />
        <GradientStop Color="#FFA4B0B9" Offset="1" />
    </LinearGradientBrush>    <!-- This is a color setting for text -->
    <SolidColorBrush x:Key="FontColor" Color="#FF1F3066" />    <SolidColorBrush x:Key="HeaderFontColor" Color="#FFFFFFFF" />    <!-- The Border Brush is used as the color for most borders -->
    <SolidColorBrush x:Key="BorderBrush" Color="#FFFFFFFF" />    <LinearGradientBrush x:Key="InputBackgroundBrush" EndPoint="0.504,0.351" StartPoint="0.504,-0.319">
        <GradientStop Color="#FF333333" Offset="0.416" />
        <GradientStop Color="#FF636F8B" Offset="0.54" />
    </LinearGradientBrush>    <!-- This is the default style for all labels -->
    <Style TargetType="{x:Type Label}">
        <Setter Property="Foreground" Value="{DynamicResource FontColor}" />
        <Setter Property="FontWeight" Value="Normal" />
        <Setter Property="Padding" Value="{DynamicResource LabelPadding}" />
        <Setter Property="FontFamily" Value="SimSun" />
        <Setter Property="FontSize" Value="12" />
    </Style>    <!-- This is the default style for all textblocks -->
    <Style TargetType="{x:Type TextBlock}">
        <Setter Property="FontFamily" Value="SimSun" />
        <Setter Property="FontSize" Value="12"/>
    </Style>    <Style x:Key="NormalButtonStyle" TargetType="{x:Type Button}">
        <Setter Property="Foreground" Value="#FFFFFF" />
        <Setter Property="Width" Value="60" />
        <Setter Property="Height" Value="25" />
        <Setter Property="FontSize" Value="12" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type Button}">
                    <Grid>
                        <Rectangle x:Name="Rectangle" Stroke="{x:Null}" StrokeMiterLimit="1.000000" StrokeThickness="0.500000" RadiusX="5" RadiusY="5">
                            <Rectangle.Fill>
                                <LinearGradientBrush EndPoint="0.501,0.039" StartPoint="0.501,0.971">
                                    <GradientStop Color="#FF4A7DDB" Offset="0.335" />
                                    <GradientStop Color="#FF75B5E0" Offset="0.879" />
                                    <GradientStop Color="#FF04448C" Offset="0.011" />
                                    <GradientStop Color="#FF75B5E0" Offset="0.986" />
                                </LinearGradientBrush>
                            </Rectangle.Fill>
                        </Rectangle>
                        <ContentPresenter SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" RecognizesAccessKey="True" />
                    </Grid>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsKeyboardFocused" Value="true" />
                        <Trigger Property="IsMouseOver" Value="true">
                            <Setter Property="Fill" TargetName="Rectangle">
                                <Setter.Value>
                                    <LinearGradientBrush EndPoint="0.501,0.039" StartPoint="0.501,0.971">
                                        <GradientStop Color="#FF5287E8" Offset="0.335" />
                                        <GradientStop Color="#FFA4D4F4" Offset="0.879" />
                                        <GradientStop Color="#FF075AB7" Offset="0.011" />
                                        <GradientStop Color="#FFA4D4F4" Offset="0.986" />
                                    </LinearGradientBrush>
                                </Setter.Value>
                            </Setter>
                        </Trigger>
                        <Trigger Property="IsEnabled" Value="false">
                            <Setter Property="Foreground" Value="#FFACA899"/>
                            <Setter Property="Fill" TargetName="Rectangle" Value="Gray"/>
                        </Trigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>    <!--This sets the default style for all buttons-->
    <Style TargetType="{x:Type Button}" BasedOn="{StaticResource NormalButtonStyle}" />    <LinearGradientBrush x:Key="DarkBrush" StartPoint="0,0" EndPoint="0,1">
        <LinearGradientBrush.GradientStops>
            <GradientStopCollection>
                <GradientStop Color="#FFF" Offset="0.0"/>
                <GradientStop Color="#AAA" Offset="1.0"/>
            </GradientStopCollection>
        </LinearGradientBrush.GradientStops>
    </LinearGradientBrush>

Answer 4

    <LinearGradientBrush x:Key="NormalBorderBrush" StartPoint="0,0" EndPoint="0,1">
        <LinearGradientBrush.GradientStops>
            <GradientStopCollection>
                <GradientStop Color="#CCC" Offset="0.0"/>
                <GradientStop Color="#444" Offset="1.0"/>
            </GradientStopCollection>
        </LinearGradientBrush.GradientStops>
    </LinearGradientBrush>    <SolidColorBrush x:Key="GlyphBrush" Color="#444" />    <Style TargetType="{x:Type DatePicker}">
        <Setter Property="Foreground" Value="#FF333333"/>
        <Setter Property="IsTodayHighlighted" Value="True"/>
        <Setter Property="SelectedDateFormat" Value="Short"/>
        <Setter Property="Background" Value="Transparent"/>
        <Setter Property="Padding" Value="2"/>
        <Setter Property="BorderBrush">
            <Setter.Value>
                <LinearGradientBrush EndPoint=".5,0" StartPoint=".5,1">
                    <GradientStop Color="#FFA3AEB9" Offset="0"/>
                    <GradientStop Color="#FF8399A9" Offset="0.375"/>
                    <GradientStop Color="#FF718597" Offset="0.375"/>
                    <GradientStop Color="#FF617584" Offset="1"/>
                </LinearGradientBrush>
            </Setter.Value>
        </Setter>
        <Setter Property="BorderThickness" Value="1"/>
        <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type DatePicker}">
                    <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}">
                        <VisualStateManager.VisualStateGroups>
                            <VisualStateGroup x:Name="CommonStates">
                                <VisualState x:Name="Normal"/>
                                <VisualState x:Name="Disabled">
                                    <Storyboard>
                                        <DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="PART_DisabledVisual"/>
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                        </VisualStateManager.VisualStateGroups>
                        <Grid x:Name="PART_Root" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}">
                            <Grid.Resources>
                                <SolidColorBrush x:Key="DisabledBrush" Color="#A5FFFFFF"/>
                                <ControlTemplate x:Key="DropDownButtonTemplate" TargetType="{x:Type Button}">
                                    <Grid>
                                        <VisualStateManager.VisualStateGroups>
                                            <VisualStateGroup x:Name="CommonStates">
                                                <VisualStateGroup.Transitions>
                                                    <VisualTransition GeneratedDuration="0"/>
                                                    <VisualTransition GeneratedDuration="0:0:0.1" To="MouseOver"/>
                                                    <VisualTransition GeneratedDuration="0:0:0.1" To="Pressed"/>
                                                </VisualStateGroup.Transitions>
                                                <VisualState x:Name="Normal"/>
                                                <VisualState x:Name="MouseOver">
                                                    <Storyboard>
                                                        <ColorAnimation Duration="0" To="#FF448DCA" Storyboard.TargetProperty="(Border.Background).(SolidColorBrush.Color)" Storyboard.TargetName="Background"/>
                                                        <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[3].(GradientStop.Color)" Storyboard.TargetName="BackgroundGradient">
                                                            <SplineColorKeyFrame KeyTime="0" Value="#7FFFFFFF"/>
                                                        </ColorAnimationUsingKeyFrames>
                                                        <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[2].(GradientStop.Color)" Storyboard.TargetName="BackgroundGradient">
                                                            <SplineColorKeyFrame KeyTime="0" Value="#CCFFFFFF"/>
                                                        </ColorAnimationUsingKeyFrames>
                                                        <ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[1].(GradientStop.Color)" Storyboard.TargetName="BackgroundGradient">
                                                            <SplineColorKeyFrame KeyTime="0" Value="#F2FFFFFF"/>
                                                        </ColorAnimationUsingKeyFrames>
                                                    </Storyboard>

Answer 5

你是不是用了WPFToolKit？如果是的，那原因就是WPFToolKit里也有VisualState，与WPF中的VisualState引用不明确，可以添加原先VisualState的引用：xmlns:sysWin="clr-namespace:System.Windows;assembly=PresentationFramework"
然后给每个VisualState、VisualStateManager还有VisualStateGroup加上sysWin前缀就可以了