InvalidOperationException: 序列不包含任何匹配元素 StackTrace: 在 System.Linq.Enumerable.First[TSource](IEnumerable`1 source, Func`2 predicate) 在 QuickerCodeEditor.View.CodeEditorWrapper.RemoveVariable(ExpressionInputParam inputParam) 在 QuickerCodeEditor.View.CodeEditorWrapper.<CreateContextMenu>b__22_0(Object s, RoutedEventArgs e) 在 System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised) 在 System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args) 在 System.Windows.Controls.MenuItem.InvokeClickAfterRender(Object arg) 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)