我从WPF开始。我正在做教程SofiaCarRental,我有'本地'别名的问题。有人能用这个别名帮我吗? 我找不到所有这些课程。
错误列表
Error 3 ''local' is an undeclared prefix. Line 1, position 2.' XML is not valid. c:\..\SofiaCarRental.WPF\Views\AddEditWindow.xaml 1 2 SofiaCarRental.WPF
Error 5 The attachable property 'Resources' was not found in type 'Window'. c:\..\SofiaCarRental.WPF\Views\AddEditWindow.xaml 8 6 SofiaCarRental.WPF
Error 2 The name "NullableBooleanConverter" does not exist in the namespace "clr-namespace:SofiaCarRental.WPF.Views". c:\..\SofiaCarRental.WPF\Views\MainWindow.xaml 10 9 SofiaCarRental.WPF
Error 1 The namespace prefix "local" is not defined. c:\..\SofiaCarRental.WPF\Views\AddEditWindow.xaml 1 1 SofiaCarRental.WPF
Error 4 The type 'local:BaseDialogWindow' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built. c:\..\SofiaCarRental.WPF\Views\AddEditWindow.xaml 1 2 SofiaCarRental.WPF
Error 8 The type 'local:EmptyStringConverter' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built. c:\..\SofiaCarRental.WPF\Views\AddEditWindow.xaml 11 10 SofiaCarRental.WPF
Error 6 The type 'local:NullableBooleanConverter' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built. c:\..\SofiaCarRental.WPF\Views\AddEditWindow.xaml 9 10 SofiaCarRental.WPF
Error 7 The type 'local:YearConverter' was not found. Verify that you are not missing an assembly reference and that all referenced assemblies have been built. c:\..\SofiaCarRental.WPF\Views\AddEditWindow.xaml 10 10 SofiaCarRental.WPF
主窗口(这里我指定'本地')
<Window x:Class="SofiaCarRental.WPF.Views.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
xmlns:local ="clr-namespace:SofiaCarRental.WPF.Views"
Title="Sofia Car Rental"
Height="720" Width="1280"
MinHeight="720" MinWidth="1280">
<Window.Resources>
<local:NullableBooleanConverter x:Key="booleanConverter" />
<Style x:Key="checkBoxColStyle" TargetType="telerik:GridViewCell">
<Setter Property="HorizontalContentAlignment" Value="Center" />
</Style>
</Window.Resources>
<Grid HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Width="Auto">
...
</Grid></Window>
AddEditWindow
<local:BaseDialogWindow x:Class="SofiaCarRental.WPF.Views.AddEditWindow"
xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="AddEditWindow"
Height="417" Width="383"
Title="{Binding Path=Title}">
<Window.Resources>
<local:NullableBooleanConverter x:Key="booleanConverter" />
<local:YearConverter x:Key="yearConverter" />
<local:EmptyStringConverter x:Key="emptyStringConverter" />
</Window.Resources>
<Grid Margin="20,10,50,10">
...
</Grid></local:BaseDialogWindow>
BaseDialogWindow类:
namespace SofiaCarRental.WPF.Views
{
public class BaseDialogWindow : Window
{
public BaseDialogWindow()
{
this.Owner = App.Current.MainWindow;
this.ShowInTaskbar = false;
this.ResizeMode = System.Windows.ResizeMode.NoResize;
this.WindowStartupLocation = System.Windows.WindowStartupLocation.CenterOwner;
}
}}
NullableBooleanConverter
namespace SofiaCarRental.WPF.Views{
public class NullableBooleanConverter : IValueConverter
{
public object Convert(object value, Type targetType,
object parameter, CultureInfo culture)
{
object result = this.NullableBooleanToFalse(value);
return result;
}
public object ConvertBack(object value, Type targetType,
object parameter, CultureInfo culture)
{
object result = this.NullableBooleanToFalse(value);
return result;
}
private object NullableBooleanToFalse(object value)
{
if (value == null)
{
return false;
}
else
{
return value;
}
}
}}
答案 0 :(得分:4)
错误3''local'是未声明的前缀。第1行,第2位。' XML无效。 c:.. \ SofiaCarRental.WPF \ Views \ AddEditWindow.xaml 1 2 SofiaCarRental.WPF
在文件AddEditWindow.xaml
中,未声明local
前缀。 XML名称空间声明在逐个文件的基础上工作。它们不是继承的,只对当前文件有效。如果要在该文件中使用其他命名空间中的组件,则还必须在其中添加声明。你可以在代码中看到它们就像using
一样 - 只要你想使用一个类型,就必须先告诉编译器在哪里查找它:
<local:BaseDialogWindow x:Class="SofiaCarRental.WPF.Views.AddEditWindow"
…
xmlns:local="clr-namespace:SofiaCarRental.WPF.Views"
… >
错误5在“窗口”类型中找不到可附加属性“资源”。 c:.. \ SofiaCarRental.WPF \ Views \ AddEditWindow.xaml 8 6 SofiaCarRental.WPF
虽然local:BaseDialogWindow
是Window
的子类型,但这仍然是此文件的类型。编译器在查看此部分的XAML时会看到这一点:
<SomeType …>
<OtherType.Property>…</OtherType.Property>
</SomeType>
这基本上等同于:
<SomeType … OtherType.Property="…" />
由于OtherType
与SomeType
不同,因此这是XAML中的附加属性。但是Window
没有名为Resources
的附加属性。
您想要做的是改为设置窗口的Resources
属性。你的窗口类型是SomeType
,所以你需要这样写:
<SomeType …>
<SomeType.Property>…</SomeType.Property>
</SomeType>
所以在你的情况下,你想设置这样的资源:
<local:BaseDialogWindow x:Class="SofiaCarRental.WPF.Views.AddEditWindow"
… >
<local:BaseDialogWindow.Resources>
…
</local:BaseDialogWindow.Resources>
…
</local:BaseDialogWindow>
剩下的错误都是因为你使用local:
前缀而没有先声明它而编译器没有找到你的类型。