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[英]NativeActivity in XAML loaded COMPILED workflow throws Expression Activity type 'CSharpValue1' requires compilation in order to run
[英]Run Workflow with nested XAML-activity
我需要运行工作流程XAML,但是该工作流程会保留对其他XAML的引用。 当我尝试通过以下方式运行工作流程时
ActivityXamlServicesSettings settings = new ActivityXamlServicesSettings
{
CompileExpressions = true
};
return ActivityXamlServices.Load(stream, settings);
我从加载方法中得到下一个错误:
活动'MyNamespace.MyMainActivity'的CacheMetadata抛出'System.Xaml.XamlObjectWriterException:无法创建未知类型'{clr-namespace:MyNamespace} MyNestedActivity'。
我该如何解决?
我认为您必须将内部xamls转换为dll(汇编)文件。 并在读取/加载父xaml的同时加载程序集文件。
System.Xaml.XamlXmlReaderSettings xmlsettings = new System.Xaml.XamlXmlReaderSettings();
if(dllFile != null) {
Assembly wfAssembly = Assembly.Load(dllFile);
xmlsettings.LocalAssembly = wfAssembly;
}
System.IO.StringReader stringReader = new System.IO.StringReader(xaml);
XamlXmlReader reader = new XamlXmlReader(stringReader, xmlsettings);
ActivityXamlServicesSettings settings = new ActivityXamlServicesSettings { CompileExpressions = true };
Activity activity = System.Activities.XamlIntegration.ActivityXamlServices.Load(reader, settings);
希望这可以帮助。
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