我在WPF中用C＃NET 3.5编写了一个项目，它在调试时启动得非常好。
对影响＆＃34; WPF＆＃34;的所有事物都处于低水平。我希望我能在这个项目中成功告诉我，我成功了。
我无法完全向您发送RootWindow.xaml.cs，因为它有超过9000行并且可能很复杂。
无论如何，当我点击项目中的按钮时出现问题， Visual Studio 会将我发回给告诉我null的行，但我不知道如何解决此问题根据我的研究，非常频繁的错误。
以下是有问题的错误：
未处理的类型＆＃39; System.NullReferenceException＆＃39;发生在EWIN_THEME_MAKER.exe中。
附加信息：未将对象引用设置为对象的实例。
因此，当我点击按钮时，VS会突出显示名为null的对象，所以这是：
public void StartPreview_Theme()
{
this.setTheme();
this.previewMaker.MakePreview(ref this.theme);
}
this.previewMaker = null
然而，在课程开始时RootWindow.xaml.cs
private PreviewMaker previewMaker;
所以我在我的PreviewMaker课程中进行了搜索，但我看不出可能是null。特别是因为它看起来很复杂，因为最后引用了几个类。有：PreviewMaker，Theme，LayoutManager
在我的PreviewMaker中，此代码对应于单击按钮时发生的操作：
public void MakePreview(ref Theme theme)
{
this.layoutManager.rootWindow = this.rootWindow;
this.layoutManager.setThemeInfo(theme);
if (this.layoutManager.changeLayout())
{
this.ConvertLayout(ref theme);
this.ReloadPreviewImage();
theme.IsFirstConvert = false;
theme.setChangeFix();
}
else
{
MessageBox.Show(this.rootWindow, Resources.Dialog_Err_Convert, Resources.Dialog_Err_Header);
}
}
我还指出此行中有一个错误，即null：
MessageBox.Show(this.rootWindow, Resources.Dialog_Err_Convert, Resources.Dialog_Err_Header);
这个问题可能来自哪里？
我不会发送我的课程，因为它们太长了，但如果有必要，我可以把它放在它可以帮助我并帮助他人。
PreviewMaker.cs:
using System;
using System.Diagnostics;
using System.IO;
using System.Runtime.InteropServices;
using System.Threading;
using System.Windows;
using EWIN_THEME_MAKER.Properties;
using EWIN_THEME_MAKER.ThemeMaker.Views;
namespace EWIN_THEME_MAKER.ThemeMaker
{
public class PreviewMaker
{
private static readonly IntPtr HWND_TOP = new IntPtr(0);
private static readonly IntPtr HWND_TOPMOST = new IntPtr(-1);
private LayoutManager layoutManager = new LayoutManager();
private const uint SWP_NOSIZE = 1;
private const uint SWP_NOMOVE = 2;
private const int WM_QUIT = 18;
private const int WM_COPYDATA = 74;
private string convertPath;
private string lytviewerPath;
private string layoutFolderPath;
private string layoutDName;
private string layoutDPlayName;
private string layoutUName;
private string layoutUPlayName;
private string outputDFolderPath;
private string outputDPlayFolderPath;
private string outputUFolderPath;
private string outputUPlayFolderPath;
public RootWindow rootWindow;
private IntPtr hWnd;
public PreviewMaker()
{
this.convertPath = ThemeBinaryConverter.App.tmakeRootPath + "tools\\LayoutConverter\\NW4C_LayoutConverter.exe";
this.lytviewerPath = ThemeBinaryConverter.App.tmakeRootPath + "tools\\lytviewer\\lytviewer.exe";
this.layoutFolderPath = ThemeBinaryConverter.App.tmakeRootPath + "resources\\clyt\\Menu\\layout_out\\";
this.layoutDName = this.layoutFolderPath + "DummyMenu_D_00";
this.layoutDPlayName = this.layoutFolderPath + "DummyMenu_D_00_play";
this.layoutUName = this.layoutFolderPath + "DummyMenu_U_00";
this.layoutUPlayName = this.layoutFolderPath + "DummyMenu_U_00_play";
string tempPath = Path.GetTempPath();
this.outputDFolderPath = tempPath + "menu_d";
this.outputDPlayFolderPath = tempPath + "menu_anim_d";
this.outputUFolderPath = tempPath + "menu_u";
this.outputUPlayFolderPath = tempPath + "menu_anim_u";
}
private void ExecConvertLayout(string inputCLYTFilePath, string inputCLANFilePath, string outputFolderPath)
{
string str = "-u -g --bake-infinity \"" + inputCLYTFilePath + "\" \"" + inputCLANFilePath + "\" \"" + outputFolderPath + "\"";
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
Util.Execute(this.convertPath, str, true);
stopwatch.Stop();
Console.Write("{0} コンパイル時間(ms)", (object)outputFolderPath);
Console.WriteLine(" . . . {0}", (object)stopwatch.ElapsedMilliseconds);
}
private void ConvertUpLayout()
{
this.ExecConvertLayout(this.layoutUName + ".clyt", this.layoutUName + ".clan", this.outputUFolderPath);
this.ExecConvertLayout(this.layoutUPlayName + ".clyt", this.layoutUPlayName + ".clan", this.outputUPlayFolderPath);
}
private void ConvertDownLayout()
{
this.ExecConvertLayout(this.layoutDName + ".clyt", this.layoutDName + ".clan", this.outputDFolderPath);
this.ExecConvertLayout(this.layoutDPlayName + ".clyt", this.layoutDPlayName + ".clan", this.outputDPlayFolderPath);
}
private void ConvertLayout(ref Theme theme)
{
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
WaitWindow waitWindow = new WaitWindow();
waitWindow.Owner = Application.Current.MainWindow;
waitWindow.Show();
waitWindow.setPercentLabel("Wait：0/2");
if (theme.IsFirstConvert || theme.IsDownChanged)
this.ConvertDownLayout();
waitWindow.setPercentLabel("Wait：1/2");
if (theme.IsFirstConvert || theme.IsUpChanged)
this.ConvertUpLayout();
waitWindow.setPercentLabel("Wait：2/2");
waitWindow.Close();
stopwatch.Stop();
Console.WriteLine("Please Wait(ms) = {0}", (object)stopwatch.ElapsedMilliseconds);
}
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern IntPtr FindWindow(string lpClassName, string lpWindowName);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
private static extern uint SendMessage(IntPtr hWnd, int msg, IntPtr wParam, ref PreviewMaker.COPYDATASTRUCT lParam);
[DllImport("user32.dll", CharSet = CharSet.Auto)]
public static extern bool PostMessage(IntPtr hWnd, int Msg, int wParam, int lParam);
[DllImport("user32.dll", SetLastError = true)]
public static extern int GetWindowThreadProcessId(IntPtr hWnd, out int lpdwProcessId);
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool SetForegroundWindow(IntPtr hWnd);
[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int x, int y, int cx, int cy, uint flags);
[DllImport("user32.dll")]
private static extern int GetWindowRect(IntPtr hwnd, ref PreviewMaker.RECT lpRect);
public void OpenPreview()
{
this.hWnd = PreviewMaker.FindWindow("TMAKE", (string)null);
if (!this.hWnd.Equals((object)IntPtr.Zero))
return;
try
{
new Process()
{
StartInfo = {
FileName = this.lytviewerPath,
Arguments = (" --upper \"" + this.outputUFolderPath + "\" --lower \"" + this.outputDFolderPath + "\"")
}
}.Start();
Thread.Sleep(1000);
this.hWnd = PreviewMaker.FindWindow("TMAKE", (string)null);
}
catch (Exception ex)
{
int num = (int)MessageBox.Show((Window)this.rootWindow, ex.ToString(), Resources.Dialog_Err_Header);
}
}
public void ActivePreview()
{
this.hWnd = PreviewMaker.FindWindow("TMAKE", (string)null);
if (this.hWnd.Equals((object)IntPtr.Zero))
return;
PreviewMaker.SetForegroundWindow(this.hWnd);
}
public void ReloadPreviewWithDynamicLayout()
{
this.OpenPreview();
PreviewMaker.COPYDATASTRUCT lParam = new PreviewMaker.COPYDATASTRUCT();
PreviewMaker.LayoutProtocol layoutProtocol;
layoutProtocol.Verb = "Open";
layoutProtocol.Data = " -t upper " + this.outputUPlayFolderPath + " -t lower " + this.outputDPlayFolderPath;
IntPtr ptr = Marshal.AllocHGlobal(Marshal.SizeOf((object)layoutProtocol));
Marshal.StructureToPtr((object)layoutProtocol, ptr, false);
lParam.lpData = ptr;
lParam.cbData = 2112U;
PreviewMaker.SendMessage(this.hWnd, 74, this.hWnd, ref lParam);
}
public void ReloadPreviewImage()
{
this.OpenPreview();
PreviewMaker.COPYDATASTRUCT lParam = new PreviewMaker.COPYDATASTRUCT();
PreviewMaker.LayoutProtocol layoutProtocol;
layoutProtocol.Verb = "Open";
layoutProtocol.Data = " -t upper " + this.outputUFolderPath + " -t lower " + this.outputDFolderPath;
IntPtr ptr = Marshal.AllocHGlobal(Marshal.SizeOf((object)layoutProtocol));
Marshal.StructureToPtr((object)layoutProtocol, ptr, false);
lParam.lpData = ptr;
lParam.cbData = 2112U;
PreviewMaker.SendMessage(this.hWnd, 74, this.hWnd, ref lParam);
}
public void ChangePreviewParam(string paramData)
{
this.hWnd = PreviewMaker.FindWindow("TMAKE", (string)null);
if (this.hWnd.Equals((object)IntPtr.Zero))
this.ReloadPreviewImage();
PreviewMaker.COPYDATASTRUCT lParam = new PreviewMaker.COPYDATASTRUCT();
PreviewMaker.LayoutProtocol layoutProtocol;
layoutProtocol.Verb = "Change";
layoutProtocol.Data = paramData;
IntPtr ptr = Marshal.AllocHGlobal(Marshal.SizeOf((object)layoutProtocol));
Marshal.StructureToPtr((object)layoutProtocol, ptr, false);
lParam.lpData = ptr;
lParam.cbData = 2112U;
PreviewMaker.SendMessage(this.hWnd, 74, this.hWnd, ref lParam);
int lpdwProcessId;
PreviewMaker.GetWindowThreadProcessId(this.hWnd, out lpdwProcessId);
Interaction.AppActivate(lpdwProcessId);
}
public void ChangePreviewAnimationParam(int animParam)
{
this.ChangePreviewParam(" -anim " + (object)animParam);
}
public void ChangePreviewVisiblePaneParam(string paneName)
{
this.ChangePreviewParam(" -panevisible N_BaseCtr_00");
}
public void ChangePreviewPositionPaneParam(string paneName, int x, int y)
{
this.ChangePreviewParam(" -panetrans " + paneName + " " + (object)x + " " + (object)y);
}
public void MakePreview(ref Theme theme)
{
this.layoutManager.rootWindow = this.rootWindow;
this.layoutManager.setThemeInfo(theme);
if (this.layoutManager.changeLayout())
{
this.ConvertLayout(ref theme);
this.ReloadPreviewImage();
theme.IsFirstConvert = false;
theme.setChangeFix();
}
else
{
int num = (int)MessageBox.Show((Window)this.rootWindow, Resources.Dialog_Err_Convert, Resources.Dialog_Err_Header);
}
}
public void ClosePreview()
{
this.hWnd = PreviewMaker.FindWindow("TMAKE", (string)null);
if (this.hWnd.Equals((object)IntPtr.Zero))
return;
PreviewMaker.RECT lpRect = new PreviewMaker.RECT();
PreviewMaker.GetWindowRect(this.hWnd, ref lpRect);
Settings.Default.lytviewerX = (double)lpRect.left;
Settings.Default.lytviewerY = (double)lpRect.top;
PreviewMaker.PostMessage(this.hWnd, 18, 0, 0);
}
public void CaptureReportImage(ref Theme theme, string captureFolderPath)
{
int num = theme.RecommendRowNum < eRecommendRowType.Row1 || theme.RecommendRowNum > eRecommendRowType.Row6 ? 11 : 5 + 7 * (int)(theme.RecommendRowNum - 1) + 6;
this.ClosePreview();
string str = "" + " --upper \"" + this.outputUFolderPath + "\"" + " --lower \"" + this.outputDFolderPath + "\"" + " --screenshot " + (object)num + " 0 \"" + captureFolderPath + "\"";
Process process = new Process();
process.StartInfo.FileName = this.lytviewerPath;
process.StartInfo.Arguments = str;
process.Start();
process.WaitForExit();
this.hWnd = PreviewMaker.FindWindow("TMAKE", (string)null);
}
public void Capture(string captureFolderPath)
{
this.Capture(captureFolderPath, 0);
}
public void Capture(string captureFolderPath, int animationNum)
{
this.ClosePreview();
string str1 = "";
if (Settings.Default.CaptureTypeStr == "Both")
str1 = str1 + " --upper \"" + this.outputUFolderPath + "\"" + " --lower \"" + this.outputDFolderPath + "\"";
else if (Settings.Default.CaptureTypeStr == "Up")
str1 = str1 + " --upper \"" + this.outputUFolderPath + "\"";
else if (Settings.Default.CaptureTypeStr == "Down")
str1 = str1 + " --lower \"" + this.outputDFolderPath + "\"";
string str2 = str1 + " --screenshot " + (object)animationNum + " 0 \"" + captureFolderPath + "\"";
Process process = new Process();
process.StartInfo.FileName = this.lytviewerPath;
process.StartInfo.Arguments = str2;
process.Start();
process.WaitForExit();
this.hWnd = PreviewMaker.FindWindow("TMAKE", (string)null);
}
private struct RECT
{
public int left;
public int top;
public int right;
public int bottom;
}
public struct COPYDATASTRUCT
{
public IntPtr dwData;
public uint cbData;
public IntPtr lpData;
}
public struct LayoutProtocol
{
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
public string Verb;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 1024)]
public string Data;
}
}
}
答案 0 :(得分：2)
确保您创建了PreviewMaker类的实例，即尝试在RootWindow.xaml.cs中更改此行：
private PreviewMaker previewMaker;
......对此：
private PreviewMaker previewMaker = new PreviewMaker();
答案 1 :(得分：1)
您已声明previewMaker，但在尝试访问之前未初始化
换句话说，：
private PreviewMaker previewMaker;
将导致previewMaker为空 该行不会创建PreviewMaker类型的对象