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.ArgumentNul
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.
<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...
If the DataContext of an ancestor element in the element tree (technically, the logical tree) is given a value for its DataContext, the value will automatically be inherited by every descendant element in the user interface. In other words, if a window's DataContext is ...
为空时,出现红色叹号,ToolTip提示 "Text cannot be empty." 小于下限时,出现红色叹号,ToolTip提示 "Value out of lower limit range." 大于上限时,出现红色叹号,ToolTip提示 "Value out of upper limit range." IDataErrorInfo IDataErrorInfo是一个接口,Viewmodel 实现接口用于在后台,提供数据验证和错误信息。
_view.SymbolValue = String.Empty; _view.SymbolChange = String.Empty; _view.ServiceProviderName = String.Empty; }privatevoidUpdateView(StockInfo stock){// Update the view_view.QuickInfoErrorMessage = String.Empty; _view.SymbolDisplayName = stock.Symbol; _view.SymbolValue = stock.Quote; _view...
{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...
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 ...
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) ...
This will be used to identify the tab to be deleted in the Click event handler of the button. Bind Text property of TextBlock to the Header of the TabItem. The Header that is a string value will be set in the code-behind. <DataTemplate x:Key="TabHeader" DataType="TabItem"> <Dock...