EvalException: Oops! The current expression is null. The error occurred for expression "=" at position 16 near "= actionItem;". --OriginalCode: _context.Action = actionItem; --ParsedCode: _context.Action = actionItem; --Token: = --StartPosition: 16 --NearText: = actionItem; StackTrace: 在 .(Expression , SyntaxNode ) 在 .(ExpressionScope , SyntaxNode ) 在 .(ExpressionScope , SyntaxNode , Expression , Boolean ) 在 .(ExpressionScope , SyntaxNode , Expression , Boolean ) 在 .(ExpressionScope , SyntaxNode , Expression , Boolean ) 在 Z.Expressions.CodeCompiler.CSharp.ExpressionParser.ParseSyntax(ExpressionScope scope, SyntaxNode node, Type resultType) 在 .[](EvalContext , String , IDictionary`2 , Type , EvalCompilerParameterKind , ExpressionScope , String , Boolean , Boolean ) 在 .[](EvalContext , String , IDictionary`2 , Type , EvalCompilerParameterKind , Boolean , Boolean , Boolean ) 在 Z.Expressions.EvalContext.Execute[TResult](String code, Object parameters) 在 Quicker.Domain.Actions.X.XActionHelper.uQ3pYFT43jB(String , ActionExecuteContext ) 在 System.ComponentModel.CancelEventHandler.Invoke(Object sender, CancelEventArgs e) 在 System.Windows.Window.OnClosing(CancelEventArgs e) 在 System.Windows.Window.WmClose() 在 System.Windows.Window.WindowFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) 在 System.Windows.Interop.HwndSource.PublicHooksFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) 在 MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled) 在 MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) 在 System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) 在 System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)