XAML:在类型中找不到属性

时间:2018-09-15 21:50:37

标签: c# xaml xamarin

我正在尝试构建具有一些其他属性的自定义控件:

public class EntryWithBorder : Entry
{
    public static readonly BindableProperty IsCurvedCornersEnabledProperty =
        BindableProperty.Create(
            "IsCurvedCornersEnabled",
            typeof(bool),
            typeof(EntryWithBorder),
            true);

    public bool IsCurvedCornersEnabled
    {
        get { return (bool)GetValue(IsCurvedCornersEnabledProperty); }
        set { SetValue(IsCurvedCornersEnabledProperty, value); }
    }

}

然后我要在页面中使用自定义控件:

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:App.CustomControls;assembly=App"
             x:Class="App.View.LoginPage"
             BackgroundColor="{StaticResource BackgroundColor}">
    <ScrollView>
        <Grid RowSpacing="0" ColumnSpacing="25">
            <Grid.RowDefinitions>
                <RowDefinition Height="AUTO"/>
                <RowDefinition Height="AUTO"/>
                <RowDefinition Height="AUTO"/>
                <RowDefinition Height="*"/>
            </Grid.RowDefinitions>
            <BoxView BackgroundColor="White" Grid.Row="0" HeightRequest="50"/>

            <!--header spacing-->
            <BoxView BackgroundColor="White" Grid.Row="1"/>
            <Image Source="test.PNG" Aspect="AspectFit" HorizontalOptions="CenterAndExpand"/>
           <!-- <Image Source="CurvedLimiter.png" VerticalOptions="End" HeightRequest="50" Aspect="Fill"/>-->

            <!--header-->
            <BoxView BackgroundColor="White" Grid.Row="2" HeightRequest="100"/>
            <StackLayout Grid.Row="1">
                <local:EntryWithBorder IsCurvedCornersEnabled="True"  Placeholder="Email" Text="super@super.de" x:Name="emailEntry" Style="{StaticResource LoginEntry}"/>
                <Entry IsPassword="True" Placeholder="Password" Text="super" x:Name="passwordEntry" Style="{StaticResource LoginEntry}"/>
                <Switch x:Name="autoLogin" IsToggled="True" HorizontalOptions="Center"/>
                <Button Text="Login" x:Name="btnLogin" Clicked="btnLogin_Clicked" Style="{StaticResource LoginButton}"/>
            </StackLayout>

            <!--login-->
            <BoxView BackgroundColor="White" Grid.Row="3"/>
        </Grid>
    </ScrollView>
</ContentPage>

找到了自定义控件“ local:EntryWithBorder”,但是找不到可绑定的属性“ IsCurvedCornersEnabled”。相反,我收到一个错误XLS0413,在“ EntryWithBorder”类型内找不到该属性。

有什么想法吗?

谢谢!

编辑2018-09-16:可以通过重新启动VS解决此问题。但是,我必须为添加到代码中的每个新BindableProperty重新启动VS。

所以,我也遇到了一个新错误:将以下属性添加到代码中后,在初始化应用程序表单时就会出现异常:

public static readonly BindableProperty Corner123RadiussProperty =
    BindableProperty.Create(
        nameof(Corner123Radiuss),
        typeof(double),
        typeof(EntryWithBorder),
        7);

// Gets or sets CornerRadius value
public double Corner123Radiuss
{
    get { return (double)GetValue(Corner123RadiussProperty); }
    set { SetValue(Corner123RadiussProperty, value); }
}

奇怪的是,我现在甚至没有从XAML代码中引用此属性。在LoginPage中的InitializeComponents()方法中引发异常:

System.TypeInitializationException: The type initializer for 'App.CustomControls.EntryWithBorder' threw an exception.

目前我没有更多信息。

我将项目包装在以下文件中:VS Project

1 个答案:

答案 0 :(得分:0)

更改此

public static readonly BindableProperty Corner123RadiussProperty =
BindableProperty.Create(
    nameof(Corner123Radiuss),
    typeof(double),
    typeof(EntryWithBorder),
    7);

收件人

public static readonly BindableProperty Corner123RadiussProperty =
BindableProperty.Create(
    nameof(Corner123Radiuss),
    typeof(double),
    typeof(EntryWithBorder),
    7.0);

此可绑定属性为double类型,使用7设置默认值将作为整数处理,因此必须为7.0