I find a bug in your u201CCrystal Reports for Visual Studio 2010u201D. When I use CrystalReportsViewer in our WPF application a get this exception: Value cannot be null. Parameter name: window System.ArgumentNullException was unhandled Message=Value cannot be null. Parameter name: window Sour...
When i adding Elementhost into Winform, an error occurs, showing "Value cannot be null. Parameter name: context" This problem has puzzled me for a long time, any help is highly appreciated.
AI代码解释 publicclassIntegerValidationRule:ValidationRule{publicint MaxVal{get;set;}publicint MinVal{get;set;}publicoverride ValidationResultValidate(object value,CultureInfo cultureInfo){string text=valueasstring;if(!int.TryParse(text,out int result)){returnnewValidationResult(false,"Text cannot be empty...
直接在Setter方法中,对value进行校验,如果不符合规则,那么就抛出异常。然后修改XAML不忽视异常。 publicclassPersonValidateInSetter : ObservableObject {privatestringname;privateintage;publicstringName {get{returnthis.name; }set{if(string.IsNullOrWhiteSpace(value)) {thrownewArgumentException("Name cannot be empty!
{thrownewFormatException("Longitude value cannot be converted", ex); }returnnewMyPointItem() { Latitude=lat, Longitude=lon }; } } 转换类型不是万能的: 只有类型转换,也会遇到难以处理的情况。比如MyClass.Item = "null"。我的意思是将Item赋值为null。但是编译不会这么处理,仍然会调用转换类型MyPoint...
Error "Value '' could not be converted." Error in g.cs files Error when running XAML script with powershell error: A TwoWay or OneWayToSource binding cannot work on the read-only property? error: The property 'Content' is set more than once Error: Unable to add event handler (button) ...
FallbackValue:定义当绑定无法返回值时的替代值。默认为空白。 StringFormat:一个表明了数据如何格式化的字符串。 ValidatesOnDataErrors:定义后,将会验证 DataErrors 。你可以通过实现接口 IDataErrorInfo 来为数据更新定义自定义的验证代码块。可以从以下链接阅读更多:使用 IDataErrorInfo 验证应用 ...
<add key="BreakIntoDebugger" value="True" /> 另一种方法是如前所述,将插件创建为独立应用程序。 然后您可以将插件作为独立应用程序对其大部分进行调试,只需定期检查与 WPF 宿主的集成是否正常工作。 如果插件进程在启动时进入调试程序中,您需要通过更改 WpfHost app.config 文件的第 4 行增加就绪事件的超时...
Learn how the precedence of different property-based inputs within the WPF property system determines the effective value of a dependency property.
{_packedData&=0xFFDFFFFF;}}}privatebool CanModifyEffectiveValues{get{return(_packedData&0x00080000)!=0;}set{Debug.Assert(!DO_Sealed,"A Sealed DO cannot be modified");if(value){_packedData|=0x00080000;}else{_packedData&=0xFFF7FFFF;}}}publicabstractclassDispatcherObject{protectedDispatcherObject...