未处理的“System.NullReferenceException”类型的异常

[flyrat]

项目work 应用类库slope,运行到

object oMissing = System.Reflection.Missing.Value;
object oEndOfDoc = "\\endofdoc"; /* \endofdoc is a predefined bookmark */

//Start Word and create a new document.
Word._Application oWord;
Word._Document oDoc;
oWord = new Word.Application();
oWord.Visible = true;

object oTemplate = "d:\\f\\word\\MyTemplate.dot";

oDoc = oWord.Documents.Add(ref oTemplate, ref oMissing,
ref oMissing, ref oMissing);


这里的时候出现错误。


************** 异常文本 **************
System.NullReferenceException: 未将对象引用设置到对象的实例。
at slope.Form1.button7_Click(Object sender, EventArgs e) in d:\f\slope\form1.cs:line 1611
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)


************** 已加载的程序集 **************
mscorlib
程序集版本: 1.0.5000.0
Win32 版本: 1.1.4322.573
基本代码: file:///c:/windows/microsoft.net/framework/v1.1.4322/mscorlib.dll
----------------------------------------
work
程序集版本: 1.0.1887.28722
Win32 版本: 1.0.1887.28722
基本代码: file:///D:/f/work/bin/Debug/work.exe
----------------------------------------
System.Windows.Forms
程序集版本: 1.0.5000.0
Win32 版本: 1.1.4322.573
基本代码: file:///c:/windows/assembly/gac/system.windows.forms/1.0.5000.0__b77a5c561934e089/system.windows.forms.dll
----------------------------------------
System
程序集版本: 1.0.5000.0
Win32 版本: 1.1.4322.573
基本代码: file:///c:/windows/assembly/gac/system/1.0.5000.0__b77a5c561934e089/system.dll
----------------------------------------
System.Drawing
程序集版本: 1.0.5000.0
Win32 版本: 1.1.4322.573
基本代码: file:///c:/windows/assembly/gac/system.drawing/1.0.5000.0__b03f5f7f11d50a3a/system.drawing.dll
----------------------------------------
System.Xml
程序集版本: 1.0.5000.0
Win32 版本: 1.1.4322.573
基本代码: file:///c:/windows/assembly/gac/system.xml/1.0.5000.0__b77a5c561934e089/system.xml.dll
----------------------------------------
slope
程序集版本: 1.0.1887.28722
Win32 版本: 1.0.1887.28722
基本代码: file:///d:/f/work/bin/debug/slope.dll
----------------------------------------
Interop.Word
程序集版本: 8.2.0.0
Win32 版本: 8.2.0.0
基本代码: file:///D:/f/work/bin/Debug/Interop.Word.DLL
----------------------------------------
mscorlib.resources
程序集版本: 1.0.5000.0
Win32 版本: 1.1.4322.573
基本代码: file:///c:/windows/assembly/gac/mscorlib.resources/1.0.5000.0_zh-chs_b77a5c561934e089/mscorlib.resources.dll
----------------------------------------
System.Windows.Forms.resources
程序集版本: 1.0.5000.0
Win32 版本: 1.1.4322.573
基本代码: file:///c:/windows/assembly/gac/system.windows.forms.resources/1.0.5000.0_zh-chs_b77a5c561934e089/system.windows.forms.resources.dll
----------------------------------------

[flyrat]

object oMissing = System.Reflection.Missing.Value;
object oEndOfDoc = "\\endofdoc"; /* \endofdoc is a predefined bookmark */

//Start Word and create a new document.
Word._Application oWord;
Word._Document oDoc;
oWord = new Word.Application();
oWord.Visible = true;

object oTemplate = "d:\\f\\word\\MyTemplate.dot";

oDoc = oWord.Documents.Add(ref oTemplate, ref oMissing,
ref oMissing, ref oMissing);

object oMissing = System.Reflection.Missing.Value;
object oEndOfDoc = "\\endofdoc"; /* \endofdoc is a predefined bookmark */

//Start Word and create a new document.
Word._Application oWord;
Word._Document oDoc;
oWord = new Word.Application();
oWord.Visible = true;

object oTemplate = "d:\\f\\word\\MyTemplate.dot";

oDoc = oWord.Documents.Add(ref oTemplate, ref oMissing,
ref oMissing, ref oMissing);
object oBookMark = "MyBookmark";
Word.Table oTable;
Word.Range wrdRng = oDoc.Bookmarks.Item(ref MyBookmark).Range;//（错误在这句）

[storm97]

Word.Range wrdRng = oDoc.Bookmarks.Item(ref MyBookmark).Range;//（错误在这句）
ref MyBookmark--MyBookmark你没有定义啊！

[web_gus]

MyBookmark 应该是 oBookMark 吧？

[flyrat]

改过来了，还是同样的错误。


单独编译slope为windows应用程序运行是没有问题的。只是编译为DLL，然后被work项目引用就出现问题了。

[白掌柜]

if ( oWord != null )
{
oDoc = oWord.Documents.Add(ref oTemplate, ref oMissing,
ref oMissing, ref oMissing);
}
else
{
MessageBox.Show("Null");
}

[foolnet]

if ( !Object.ReferenceEquals(oWord,null) )
{
oDoc = oWord.Documents.Add(ref oTemplate, ref oMissing,
ref oMissing, ref oMissing);
}
else
{
MessageBox.Show("Null");
}

[foolnet]

line 1611
是哪句？

[ofei]

可能是oDoc.Bookmarks.Item(ref MyBookmark)为null

[flyrat]

!Object.ReferenceEquals(oWord,null) 返回是真的。
应该是oDoc.Bookmarks.Item(ref MyBookmark)为null，在slope编译的windows应用程序，执行那段没有问题。把他编译为dll被work引用的时候，slope作为work窗体的一个子窗体，这种情况下就不行了。
调用slope.dll的代码是：

Assembly asm = Assembly.LoadFile(System.Windows.Forms.Application.StartupPath+"\\slope.dll");
Type formType = asm.GetType("slope.Form1");
Form[] charr = this.MdiChildren;
Form frm = OpenForm(formType);



Form OpenForm(Type formType)
{
Form frm = formType.InvokeMember(null,
BindingFlags.DeclaredOnly
| BindingFlags.Public
| BindingFlags.NonPublic
| BindingFlags.Instance
| BindingFlags.CreateInstance,
null, null, null) as Form;
frm.MdiParent = this;
frm.Show();
return frm;
}

[kenMoxi]

up

[flyrat]

谢谢各位了，object oTemplate = "d:\\f\\word\\MyTemplate.dot";
是这句的路径不对。