構造函數中的 System.Reflection.TargetInvocationException

Question

我不斷得到

System.Reflection.TargetInvocationException

和 PresentationFramework.dll，附加信息 調用的目標已拋出異常。

有人可以幫我嗎？

信息：調用堆棧

PresentationFramework.dll!System.Windows.Markup.WpfXamlLoader.Load(System.Xaml.XamlReader xamlReader, System.Xaml.IXamlObjectWriterFactory writerFactory, bool skipJournaledProperties, object rootObject, System.Xaml.XamlObjectWriterSettings settings, System.Uri baseUri) 未知

    namespace PMD.Analysis.AnalysisViewModel
        {
            using PMD.Measurement.MeasurementModel;
            using System.Windows.Data;
            using PMD.Analysis.AnalysisModel;
            using System;
            using System.Collections.Generic;
            using PMD.Measurement.MeasurementViewModel;
            public class AnalysisViewModel : ViewModel
            {

        /// <summary>
        /// New analysis command.
        /// </summary>
        private ICommand newAnalysis = null;
        public PMD.Analysis.AnalysisViewModel.NewAnalysisViewModel m_NewAnalysisViewModel;
        Measurement measurement = new Measurement();
        private ICollectionView measurements = null;
        /// <summary>
        /// Measurement's search by title field.
        /// </summary>
        private string searchTitle;
        /// <summary>
        /// Measurement's search by title field.
        /// </summary>
        private string searchTester;
        /// <summary>
        /// Measurement's search by vehicle VIN field.
        /// </summary>
        private string searchVehicleVIN;

        public MeasurementModel MeasurementModel
        {
            get;
            set;
        }


        public enum SelectedState
        {
            // No Masurements.
            Inactive,
            // Masurements.
            Active,
            // Waiting for Masurements.
            WaitingAnswer
        };


        public SelectedState CurrentSelectedState { get; set; }

        public Analysis Analysis
        {
            get;
            set;
        }

        public AnalysisViewModel()
        {

            Analysis = new Analysis();
            measurements = new ListCollectionView(MeasurementModel.Measurements);
            measurements.Filter = new Predicate<object>(SearchCallbackAnalysis);
        }

        ~AnalysisViewModel()
        {

        }

        /// <summary>
        /// List of measurements that will be displayed in analysis view.
        /// </summary>
        public ICollectionView Measurements
        {
            get { return measurements; }

            set { measurements = value; }
        }

        /// <summary>
        /// Gets or sets new analysis command.
        /// </summary>
        public ICommand NewAnalysis
        {
            get
            {
                if (newAnalysis == null)
                    newAnalysis = new NewAnalysisCommand(this);
                return newAnalysis;
            }
        }


        public bool SearchCallbackAnalysis(object item)
        {
            bool isItemShowed = true;
            if ((searchTitle != "") && (searchTitle != null))
                isItemShowed &= (((Measurement)item).Title == searchTitle);
            if ((searchVehicleVIN != "") && (searchVehicleVIN != null))
                isItemShowed &= (((Measurement)item).Vehicle.VehicleVIN == searchVehicleVIN);
            if ((SearchTester != "") && (SearchTester != null))
                isItemShowed &= (((Measurement)item).Tester == SearchTester);
            return isItemShowed;
        }



        /// <summary>
        /// Gets or sets measurement's search by title field.
        /// </summary>
        public string SearchTitle
        {
            get
            {
                return searchTitle;
            }

            set
            {

                searchTitle = value;
                Measurements.Refresh();
            }
        }

        /// <summary>
        /// Gets or sets measurement's search by tester name field.
        /// </summary>
        public string SearchTester
        {
            get
            {
                return searchTester;
            }

            set
            {

                searchTester = value;
                Measurements.Refresh();
            }
        }

        /// <summary>
        /// Gets or sets measurement's search by vehicle VIN field.
        /// </summary>
        public string SearchVehicleVIN
        {
            get
            {
                return searchVehicleVIN;
            }
            set
            {    
                searchVehicleVIN = value;
                Measurements.Refresh();
            }
        }      
    }//end AnalysisViewModel

}//end namespace AnalysisViewModel

如果我在構造函數中注釋這行代碼：

measurements.Filter = new Predicate<object>(SearchCallbackAnalysis); 

一切正常，但我需要此行在列表中進行搜索。

附加信息：

xamlReader  Cannot obtain value of local or argument 'xamlReader' as it is not available at this instruction pointer, possibly because it has been optimized away.  System.Xaml.XamlReader

writerFactory   Cannot obtain value of local or argument 'writerFactory' as it is not available at this instruction pointer, possibly because it has been optimized away.   System.Xaml.IXamlObjectWriterFactory

skipJournaledProperties Cannot obtain value of local or argument 'skipJournaledProperties' as it is not available at this instruction pointer, possibly because it has been optimized away. bool

rootObject  Cannot obtain value of local or argument 'rootObject' as it is not available at this instruction pointer, possibly because it has been optimized away.  object

settings    Cannot obtain value of local or argument 'settings' as it is not available at this instruction pointer, possibly because it has been optimized away.    System.Xaml.XamlObjectWriterSettings

baseUri Cannot obtain value of local or argument 'baseUri' as it is not available at this instruction pointer, possibly because it has been optimized away. System.Uri

Answer 1

我嘗試過：

public ICollectionView Measurements
        {
            get { return measurements; }

            set { measurements = value; 
measurements.Filter = new Predicate<object>(SearchCallbackAnalysis);
}
        }

現在一切正常。 感謝您嘗試幫助我。