Question

我正在创建一个观众。第一次进入目录时，可以通过处理文件，修改图像和将数据序列化为数据文件来创建数据文件。然后，我将新创建的文件反序列化为要查看的表单。第二次进入目录时，它会看到文件ans尝试反序列化它以填充表单。系统必须首先创建它才能正常工作，但如果它已经存在，我会收到一个未引用的对象错误。我错过了什么？

 private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            listView1.Items.Clear();
            fileInfoList.Clear();
            //fileNameList.Clear();
            ClearFlowPanel();

            TreeNode newSelected = e.Node;
            DirectoryInfo nodeDirInfo = (DirectoryInfo)newSelected.Tag;

            dirPath = nodeDirInfo.FullName;
            label_selectedPath.Text = dirPath;

            foreach (FileInfo file in nodeDirInfo.GetFiles("*.sbs", option))
            {
                if (file.Extension == ".sbs")
                {
                    fileInfoList.Add(file);

                }
            }

            foreach (FileInfo info in fileInfoList)
            {
                ListViewItem i = listView1.Items.Add(info.Name, 1);
                i.SubItems.Add(SizeInKB(info.Length));
                i.SubItems.Add(info.LastWriteTime.ToShortDateString());
            }
            listView1.AutoResizeColumns(ColumnHeaderAutoResizeStyle.HeaderSize);

            string binData = dirPath + "\\" + ".browser" + "\\" + "_browser.bin";
            if (File.Exists(binData))
            {
                DeserializeData(binData); //creates error
            }
        }

        private void DeserializeData(string binPath)
        {
            FileStream fs = new FileStream(binPath, FileMode.Open);
            BinaryFormatter bin = new BinaryFormatter();

            int length = (int)bin.Deserialize(fs);

            MessageBox.Show(length.ToString());

            for (int i = 0; i < length; i++)
            {
                viewerData[i] = (ViewerData)bin.Deserialize(fs); //problem
            }

            for (int i = 0; i < viewerData.Length; i++)
            {
                PopulateFlowControl(viewerData[i]);
                viewerNameList.Add(viewerData[i].name);
            }
        }

        private void UpdateDirectory()
        {
            thumbPath = dirPath + "\\" + ".browser";
            if (!Directory.Exists(thumbPath))
            {
                Directory.CreateDirectory(thumbPath);
            }

            fileInfoArray = fileInfoList.ToArray();
            viewerData = new ViewerData[fileInfoArray.Length];

            string binData = thumbPath + "\\" + "_browser.bin";
            Stream stream = File.Open(binData, FileMode.Create);
            BinaryFormatter bin = new BinaryFormatter();
            bin.Serialize(stream, fileInfoArray.Length);

            ProgressBar_Form progressBar = new ProgressBar_Form(fileInfoArray.Length);
            progressBar.Show();

            for (int i = 0; i < fileInfoArray.Length; i++)
            {
                viewerData[i] = new ViewerData(fileInfoArray[i]);
                bin.Serialize(stream, viewerData[i]);

                progressBar.progressBar1.PerformStep();
                progressBar.label_progress.Text = "Processing : " + fileInfoArray[i].Name;

                viewerData[i].image.Dispose();

                if (File.Exists(viewerData[i].imagePath))
                {
                    File.Delete(viewerData[i].imagePath);
                }
            }

            stream.Close();
            progressBar.Close();

            DeserializeData(binData); //works fine
        }

编辑：

错误：对象引用未设置为对象的实例 - 在DeserializeData（string binPath）的第一个for循环中注释'problem';

堆栈跟踪......

在X：\ Visual Studio 2010 \ Projects \ Substance Designer \ Substance_Browser_12 \ Substance_Browser_12 \ Form1.cs中的Substance_Browser_12.Form1.DeserializeData（String binPath）：第151行 at Substance_Browser_12.Form1.treeView1_NodeMouseClick（Object sender，TreeNodeMouseClickEventArgs e）在X：\ Visual Studio 2010 \ Projects \ Substance Designer \ Substance_Browser_12 \ Substance_Browser_12 \ Form1.cs：第133行在System.Windows.Forms.TreeView.OnNodeMouseClick（TreeNodeMouseClickEventArgs e）在System.Windows.Forms.TreeView.WmNotify（消息＆amp; m）在System.Windows.Forms.TreeView.WndProc（消息＆amp; m）在System.Windows.Forms.Control.ControlNativeWindow.OnMessage（Message＆amp; m）在System.Windows.Forms.Control.ControlNativeWindow.WndProc（Message＆amp; m）在System.Windows.Forms.NativeWindow.DebuggableCallback（IntPtr hWnd，Int32 msg，IntPtr wparam，IntPtr lparam）在System.Windows.Forms.UnsafeNativeMethods.SendMessage（HandleRef hWnd，Int32 msg，IntPtr wParam，IntPtr lParam）在System.Windows.Forms.Control.SendMessage（Int32 msg，IntPtr wparam，IntPtr lparam）在System.Windows.Forms.Control.ReflectMessageInternal（IntPtr hWnd，Message＆amp; m）在System.Windows.Forms.Control.WmNotify（消息＆amp; m）在System.Windows.Forms.Control.WndProc（消息＆amp; m）在System.Windows.Forms.ScrollableControl.WndProc（消息＆amp; m）在System.Windows.Forms.Control.ControlNativeWindow.OnMessage（Message＆amp; m）在System.Windows.Forms.Control.ControlNativeWindow.WndProc（Message＆amp; m）在System.Windows.Forms.NativeWindow.DebuggableCallback（IntPtr hWnd，Int32 msg，IntPtr wparam，IntPtr lparam）在System.Windows.Forms.UnsafeNativeMethods.CallWindowProc（IntPtr wndProc，IntPtr hWnd，Int32 msg，IntPtr wParam，IntPtr lParam）在System.Windows.Forms.NativeWindow.DefWndProc（消息＆amp; m）在System.Windows.Forms.Control.DefWndProc（消息＆amp; m）在System.Windows.Forms.TreeView.WmMouseDown（消息＆amp; m，MouseButtons按钮，Int32点击）在System.Windows.Forms.TreeView.WndProc（消息＆amp; m）在System.Windows.Forms.Control.ControlNativeWindow.OnMessage（Message＆amp; m）在System.Windows.Forms.Control.ControlNativeWindow.WndProc（Message＆amp; m）在System.Windows.Forms.NativeWindow.DebuggableCallback（IntPtr hWnd，Int32 msg，IntPtr wparam，IntPtr lparam）在System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW（MSG＆amp; msg）在System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop（IntPtr dwComponentID，Int32 reason，Int32 pvLoopData）在System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner（Int32 reason，ApplicationContext context）在System.Windows.Forms.Application.ThreadContext.RunMessageLoop（Int32 reason，ApplicationContext context）在System.Windows.Forms.Application.Run（Form mainForm） at Substance_Browser_12.Program.Main（）在X：\ Visual Studio 2010 \ Projects \ Substance Designer \ Substance_Browser_12 \ Substance_Browser_12 \ Program.cs：第18行在System.AppDomain._nExecuteAssembly（RuntimeAssembly程序集，String [] args）在System.AppDomain.ExecuteAssembly（String assemblyFile，Evidence assemblySecurity，String [] args）在Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly（）在System.Threading.ThreadHelper.ThreadStart_Context（对象状态） at System.Threading.ExecutionContext.RunInternal（ExecutionContext executionContext，ContextCallback callback，Object state，Boolean preserveSyncCtx） at System.Threading.ExecutionContext.Run（ExecutionContext executionContext，ContextCallback callback，Object state，Boolean preserveSyncCtx）在System.Threading.ExecutionContext.Run（ExecutionContext executionContext，ContextCallback回调，对象状态）在System.Threading.ThreadHelper.ThreadStart（）

Answer 1

msdn BinaryFormatter.Deserialize Method (Stream)

中的

为了成功反序列化，流中的当前位置必须位于对象图的开头。

所以当您尝试反序列化流中的当前位置时，可能不会出现在对象图的开头。

Answer 2

你只需要改成这个

private void DeserializeData(string binPath)
    {
        FileStream fs = new FileStream(binPath, FileMode.Open);

       fs.Seek(0, SeekOrigin.Begin);

        BinaryFormatter bin = new BinaryFormatter();

        int length = (int)bin.Deserialize(fs);

        MessageBox.Show(length.ToString());

        for (int i = 0; i < length; i++)
        {
            viewerData[i] = (ViewerData)bin.Deserialize(fs); //problem
        }

        for (int i = 0; i < viewerData.Length; i++)
        {
            PopulateFlowControl(viewerData[i]);
            viewerNameList.Add(viewerData[i].name);
        }
    }

OR

public static System.IO.MemoryStream Serialize(object _Object)
{
    System.IO.MemoryStream _Return = new System.IO.MemoryStream();
    Serialize(ref _Return, _Object);
    return _Return;
}

public static void Serialize(ref System.IO.Stream Stream, object _Object)
{
    BinaryFormatter BF = new BinaryFormatter();
    BF.Serialize(Stream, _Object);
}

public static objType Deserialize<objType>(ref System.IO.Stream Stream)
{
    object _Return = null;
    Stream.Seek(0, SeekOrigin.Begin);
    BinaryFormatter BF = new BinaryFormatter();
    _Return = BF.Deserialize(Stream);
    return (objType)_Return;
}

Answer 3

您将多个ViewerData对象序列化为一个文件，但文件中没有这些对象的容器。我认为BinaryFormatter不支持这种用法。序列化这些对象的其他方法：

每个文件序列化一个ViewerData。
将所有ViewerData对象添加到集合中，然后序列化该集合。如果存在许多大图像，则可能会因此方法而出现内存不足错误。
开发一种将BinaryFormatter与手动写入/读取相结合的算法，以避免使用过多的内存。这可能需要一个中间流，例如MemoryStream用于序列化每个ViewerData。请参阅下面的伪代码步骤。

将对象的数量写入文件流对于每个对象。使用BinaryFormatter到MemoryStream进行序列化。将MemoryStream的长度写入文件流。将MemoryStream写入文件流

然后反过来反序列化对象。

Answer 4

我需要在DeserializeData（string binPath）中重新初始化viewerData。如果它来自UpdateDirectory（）它已经存在。

viewerData = new ViewerData[length];

感谢大家的意见！

序列化 - 反序列化（二进制）

4 个答案: