如何访问xaml文件中定义的代码后面的颜色

时间：2018-01-17 00:30:45

标签： c# wpf xaml

尝试使用在另一个分隔的xaml文件中定义的颜色更改ForeColor或Backcolor。如果我使用它：

LOGIN SUCCESSFULL
Login.js:62 VALIDATE TOKEN SUCCESSFULL
Login.js:63 Response {type: "default", status: 200, ok: true, statusText: undefined, headers: Headers, …}
Login.js:65 {…}
IndexLunches.js:24 RESPONSE OK : GET LUNCHES
IndexLunches.js:27 (6) [{…}, {…}, {…}, {…}, {…}, {…}]
IndexLunches.js:28 Headers {map: {…}}
ShowLunch.js:48 ENTER IN LUNCH VIEW
ShowLunch.js:49 {}
ExceptionsManager.js:65 TypeError: Cannot read property '0' of undefined

This error is located at:
    in ShowLunch (at navigationStore.js:319)
    in Wrapped (at SceneView.js:31)
    in SceneView (at CardStack.js:412)
    in RCTView (at View.js:113)
    in View (at CardStack.js:411)
    in RCTView (at View.js:113)
    in View (at CardStack.js:410)
    in RCTView (at View.js:113)
    in View (at createAnimatedComponent.js:134)
    in AnimatedComponent (at Card.js:26)
    in Card (at PointerEventsContainer.js:55)
    in Container (at CardStack.js:454)
    in RCTView (at View.js:113)
    in View (at CardStack.js:383)
    in RCTView (at View.js:113)
    in View (at CardStack.js:382)
    in CardStack (at CardStackTransitioner.js:97)
    in RCTView (at View.js:113)
    in View (at Transitioner.js:192)
    in Transitioner (at CardStackTransitioner.js:49)
    in CardStackTransitioner (at StackNavigator.js:60)
    in Unknown (at createNavigator.js:52)
    in Navigator (at createNavigationContainer.js:210)
    in NavigationContainer (at Router.js:70)
    in App (at Router.js:91)
    in Router (at LunchRouter.js:31)
    in LunchRouter (at App.js:16)
    in RCTView (at View.js:113)
    in View (at App.js:14)
    in App (created by AwakeInDevApp)
    in RCTView (at View.js:113)
    in View (created by AwakeInDevApp)
    in AwakeInDevApp (at registerRootComponent.js:34)
    in RootErrorBoundary (at registerRootComponent.js:33)
    in ExpoRootComponent (at renderApplication.js:35)
    in RCTView (at View.js:113)
    in View (at AppContainer.js:102)
    in RCTView (at View.js:113)
    in View (at AppContainer.js:122)
    in AppContainer (at renderApplication.js:34)
handleException @ ExceptionsManager.js:65
ReactNativeFiberErrorDialog @ ReactNativeFiber-dev.js:231
logCapturedError @ ReactNativeFiber-dev.js:19
captureError @ ReactNativeFiber-dev.js:2649
performWork @ ReactNativeFiber-dev.js:2601
batchedUpdates @ ReactNativeFiber-dev.js:2756
batchedUpdates @ ReactNativeFiber-dev.js:202
batchedUpdatesWithControlledComponents @ ReactNativeFiber-dev.js:209
_receiveRootNodeIDEvent @ ReactNativeFiber-dev.js:3559
receiveTouches @ ReactNativeFiber-dev.js:3572
__callFunction @ MessageQueue.js:302
(anonymous) @ MessageQueue.js:116
__guard @ MessageQueue.js:265
callFunctionReturnFlushedQueue @ MessageQueue.js:115
(anonymous) @ debuggerWorker.js:72
ExceptionsManager.js:73 TypeError: TypeError: Cannot read property '0' of undefined

This error is located at:
    in ShowLunch (at navigationStore.js:319)
    in Wrapped (at SceneView.js:31)
    in SceneView (at CardStack.js:412)
    in RCTView (at View.js:113)
    in View (at CardStack.js:411)
    in RCTView (at View.js:113)
    in View (at CardStack.js:410)
    in RCTView (at View.js:113)
    in View (at createAnimatedComponent.js:134)
    in AnimatedComponent (at Card.js:26)
    in Card (at PointerEventsContainer.js:55)
    in Container (at CardStack.js:454)
    in RCTView (at View.js:113)
    in View (at CardStack.js:383)
    in RCTView (at View.js:113)
    in View (at CardStack.js:382)
    in CardStack (at CardStackTransitioner.js:97)
    in RCTView (at View.js:113)
    in View (at Transitioner.js:192)
    in Transitioner (at CardStackTransitioner.js:49)
    in CardStackTransitioner (at StackNavigator.js:60)
    in Unknown (at createNavigator.js:52)
    in Navigator (at createNavigationContainer.js:210)
    in NavigationContainer (at Router.js:70)
    in App (at Router.js:91)
    in Router (at LunchRouter.js:31)
    in LunchRouter (at App.js:16)
    in RCTView (at View.js:113)
    in View (at App.js:14)
    in App (created by AwakeInDevApp)
    in RCTView (at View.js:113)
    in View (created by AwakeInDevApp)
    in AwakeInDevApp (at registerRootComponent.js:34)
    in RootErrorBoundary (at registerRootComponent.js:33)
    in ExpoRootComponent (at renderApplication.js:35)
    in RCTView (at View.js:113)
    in View (at AppContainer.js:102)
    in RCTView (at View.js:113)
    in View (at AppContainer.js:122)
    in AppContainer (at renderApplication.js:34)
    at ShowLunch.lunchView (ShowLunch.js:54)
    at ShowLunch.proxiedMethod (createPrototypeProxy.js:44)
    at ShowLunch.render (ShowLunch.js:72)
    at ShowLunch.proxiedMethod (createPrototypeProxy.js:44)
    at finishClassComponent (ReactNativeFiber-dev.js:1667)
    at updateClassComponent (ReactNativeFiber-dev.js:1659)
    at beginWork (ReactNativeFiber-dev.js:1786)
    at performUnitOfWork (ReactNativeFiber-dev.js:2528)
    at workLoop (ReactNativeFiber-dev.js:2554)
    at Object._invokeGuardedCallback (ReactNativeFiber-dev.js:73)
reactConsoleErrorHandler @ ExceptionsManager.js:73
console.error @ YellowBox.js:71
componentDidCatch @ RootErrorBoundary.js:71
proxiedMethod @ createPrototypeProxy.js:44
commitErrorHandling @ ReactNativeFiber-dev.js:2675
commitAllLifeCycles @ ReactNativeFiber-dev.js:2462
_invokeGuardedCallback @ ReactNativeFiber-dev.js:73
invokeGuardedCallback @ ReactNativeFiber-dev.js:47
commitAllWork @ ReactNativeFiber-dev.js:2485
workLoop @ ReactNativeFiber-dev.js:2555
performWorkCatchBlock @ ReactNativeFiber-dev.js:2587
_invokeGuardedCallback @ ReactNativeFiber-dev.js:73
invokeGuardedCallback @ ReactNativeFiber-dev.js:47
performWork @ ReactNativeFiber-dev.js:2604
batchedUpdates @ ReactNativeFiber-dev.js:2756
batchedUpdates @ ReactNativeFiber-dev.js:202
batchedUpdatesWithControlledComponents @ ReactNativeFiber-dev.js:209
_receiveRootNodeIDEvent @ ReactNativeFiber-dev.js:3559
receiveTouches @ ReactNativeFiber-dev.js:3572
__callFunction @ MessageQueue.js:302
(anonymous) @ MessageQueue.js:116
__guard @ MessageQueue.js:265
callFunctionReturnFlushedQueue @ MessageQueue.js:115
(anonymous) @ debuggerWorker.js:72
ShowLunch.js:24 RESPONSE OK : GET LUNCH, ID: 5
ShowLunch.js:27 {id: 5, title: "Coconut, Beef and Winter melon ", description: "["Propre subline nom origines sans vers.", "Italiq…rent mille qui.", "Pour nostalgique fin chemin."]", portion: 4, supply: "Aucun", …}
ShowLunch.js:28 Headers {map: {…}}
ExceptionsManager.js:73 Warning: Can only update a mounted or mounting component. This usually means you called setState, replaceState, or forceUpdate on an unmounted component. This is a no-op.

Please check the code for the ShowLunch component.

我会在程序开始时抛出异常： System.InvalidCastException：“指定的强制转换无效。”

如果我使用它：

_toolTip.ForeColor = (Color)Application.Current.Resources["Color_001"];

它告诉我Color类不允许Null并且不能用as-operater引用。

我有没有错过的方法？

ColorBrush.xaml中的代码

_toolTip.ForeColor = Resources["Color_001"] as Color;

App.xaml中的代码

<Color x:Key="Color_001">#FFFFFFFF</Color>

App.xaml.cs中的代码

<Application.Resources>
    <ResourceDictionary >
        <ResourceDictionary.MergedDictionaries >
            <ResourceDictionary Source="pack://application:,,,/ColorBrush.xaml" />
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Application.Resources>

2 个答案:

答案 0 :(得分：0)

确保您正在投射到正确的颜色类：

        //Yep, working
        System.Windows.Media.Color color1 = (System.Windows.Media.Color)Application.Current.Resources["Color_001"];

        //Works too
        System.Windows.Media.Color? color2 = Application.Current.Resources["Color_001"] as System.Windows.Media.Color?;

        //InvalidCastException
        System.Drawing.Color color3 = (System.Drawing.Color)Application.Current.Resources["Color_001"];

答案 1 :(得分：0)

在Roger Leblanc的帮助下的最终解决方案：

System.Windows.Media.Color color_01 = (System.Windows.Media.Color)Application.Current.Resources["Color_001"];
_toolTip.ForeColor = System.Drawing.Color.FromArgb(color_01.A, color_01.R, color_01.G, color_01.B);
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