A first chance exception of type 'System.Windows.Markup.XamlParseException' occurred in System.Windows.ni.dll
intializecomponent()中app.xaml文件中发生错误;方法
public App()
{
// Global handler for uncaught exceptions.
UnhandledException += Application_UnhandledException;
// Standard XAML initialization
InitializeComponent();
// Phone-specific initialization
InitializePhoneApplication();
由于我在添加应用程序资源时发生错误
<converter:RssTextTrimmer xmlns:converter="clr-namespace:HomePage" x:Key="RssTextTrimmer" />
当我删除它时,应用程序运行良好。
以下是完整代码:
<Application
x:Class="HomePage.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone">
<!--Application Resources-->
<Application.Resources>
<local:LocalizedStrings xmlns:local="clr-namespace:HomePage" x:Key="LocalizedStrings"/>
<converter:RssTextTrimmer xmlns:converter="clr-namespace:HomePage" x:Key="RssTextTrimmer" />
</Application.Resources>
<Application.ApplicationLifetimeObjects>
<!--Required object that handles lifetime events for the application-->
<shell:PhoneApplicationService
Launching="Application_Launching" Closing="Application_Closing"
Activated="Application_Activated" Deactivated="Application_Deactivated"/>
</Application.ApplicationLifetimeObjects>
转换器代码
命名空间HomePage { class RssTextTrimmer:IValueConverter {
// Clean up text fields from each SyndicationItem.
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (value == null) return null;
int maxLength = 200;
int strLength = 0;
string fixedString = "";
// Remove HTML tags and newline characters from the text, and decodes HTML encoded characters.
// This is a basic method. Additional code would be needed to more thoroughly
// remove certain elements, such as embedded Javascript.
// Remove HTML tags.
fixedString = Regex.Replace(value.ToString(), "<[^>]+>", string.Empty);
// Remove newline characters
fixedString = fixedString.Replace("\r", "").Replace("\n", "");
// Remove encoded HTML characters
fixedString = HttpUtility.HtmlDecode(fixedString);
strLength = fixedString.ToString().Length;
// Some feed management tools include an image tag in the Description field of an RSS feed,
// so even if the Description field (and thus, the Summary property) is not populated, it could still contain HTML.
// Due to this, after we strip tags from the string, we should return null if there is nothing left in the resulting string.
if (strLength == 0)
{
return null;
}
// Truncate the text if it is too long.
else if (strLength >= maxLength)
{
fixedString = fixedString.Substring(0, maxLength);
// Unless we take the next step, the string truncation could occur in the middle of a word.
// Using LastIndexOf we can find the last space character in the string and truncate there.
fixedString = fixedString.Substring(0, fixedString.LastIndexOf(" "));
}
fixedString += "...";
return fixedString;
}
// This code sample does not use TwoWay binding and thus, we do not need to flesh out ConvertBack.
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
}
答案 0 :(得分:7)
在您的RssTextTrimmer.cs文件中,确保该类是公开的 “公共课RssTextTrimmer:IValueConverter” 不 “class RssTextTrimmer:IValueConverter” 这就是我的烦恼