在Web应用程序中读取Word文档(使用Microsoft.Office.Interop.Word) [英] Reading Word Document (using Microsoft.Office.Interop.Word) in web application

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问题描述

我正在使用Mirosoft办公室互操作来读取放置在本地系统上的word文档中的数据但是当我执行代码时,它会打开一个窗口,以只读模式打开,当我选择它时会打开一个其他选项单词文档,但它无法获取数据并导致异常。

对象引用未设置为对象的实例。

文件存在且路径也有效。

[删除紧急评论]



 Microsoft.Office.Interop.Word .ApplicationClass wordApp = new Microsoft.Office.Interop.Word.ApplicationClass(); 
object file =文件名;
object readOnly = false;
object nullobj = System.Reflection.Missing.Value;
Document docs = wordApp.Documents.Open(
ref file,ref nullobj,ref readOnly,
ref nullobj,ref nullobj,ref nullobj,
ref nullobj,ref nullobj,ref nullobj,
ref nullobj,ref nullobj,ref nullobj,
ref nullobj,ref nullobj,ref nullobj,ref nullobj);
docs.ActiveWindow.Selection.WholeStory();
docs.ActiveWindow.Selection.Copy();
System.Windows.Forms.IDataObject data = System.Windows.Forms.Clipboard.GetDataObject(); //当我调试应用程序时,data为null
FileContent = data.GetData(DataFormats.Text)。 ToString(); //此处发生异常''对象引用未设置为对象的实例。''

解决方案

System.Windows.Forms.IDataObject data = System.Windows.Forms.Clipboard.GetDataObject();

这意味着数据为NULL,因此当您尝试 data.GetData 时,出现错误。

我想,你在获取数据之前没有在clipborad中设置任何数据。因此没有任何回报。首先尝试setData然后尝试getData。这里的一个例子: MSDN:剪贴板类 [ ^ ]





通常,对象引用未设置为对象的实例

发生此错误当您尝试使用属性或调用null对象的方法时。更多细节:此处 [ ^ ]


您没有显示带有对象引用未设置为实例的消息的异常的位置一个物体被抛出。



不用担心。这是检测和修复的最简单的案例之一。它只是意味着某些引用类型的某个成员/变量通过使用和它的实例(非静态)成员解除引用,这要求此成员/变量为非null,但实际上它似乎为null。只需在调试器下执行它,它将停止抛出异常的执行。在该行上设置一个断点,重新启动应用程序并再次到达这一点。评估下一行中涉及的所有引用,并查看哪一个为null,而不需要为null。解决这个问题之后,修复代码:确保将成员/变量正确初始化为非空引用,或者将其检查为null,如果为null,则执行其他操作。



另请参阅:想要在按钮点击时显示下一条记录。但是如果下一条记录功能的条件对象引用没有设置为对象的实例 [ ^ ]。



祝你好运,

-SA

I am using the Mirosoft office interop for reading data from the word document placed on the local system but when I execute the code it opens a window saying open in read-only mode and some other option when I select it opens a actual word document but it fails to fetch the data and cause the exception.
Object reference not set to an instance of an object.
The file is present and path is also valid.
[Removed urgency comment]

Microsoft.Office.Interop.Word.ApplicationClass wordApp = new Microsoft.Office.Interop.Word.ApplicationClass();
object file = Filename;
object readOnly=false;
object nullobj = System.Reflection.Missing.Value;
Document docs = wordApp.Documents.Open(
                        ref file, ref nullobj, ref readOnly,
                     ref nullobj, ref nullobj, ref nullobj,
                     ref nullobj, ref nullobj, ref nullobj,
                     ref nullobj, ref nullobj, ref nullobj,
                     ref nullobj, ref nullobj, ref nullobj, ref nullobj);
docs.ActiveWindow.Selection.WholeStory();
docs.ActiveWindow.Selection.Copy();
System.Windows.Forms.IDataObject data = System.Windows.Forms.Clipboard.GetDataObject();//data is null when I debug the application
FileContent = data.GetData(DataFormats.Text).ToString();//exception occured here ''Object reference not set to an instance of an object.''

解决方案

System.Windows.Forms.IDataObject data = System.Windows.Forms.Clipboard.GetDataObject();
This means that data is NULL and thus when you tried data.GetData , you got an error.
I guess, you have not set any data in clipborad before doing get data. Hence nothing was returned. Try to setData first and then getData. An example here: MSDN: Clipboard Class[^]


In general, Object reference not set to an instance of an object:
This error happens when you try to use a property or call a method of an object that is null. More details: here[^]


You did not show where the exception with the message "Object reference not set to an instance of an object" is thrown.

Not to worry. This is one of the very easiest cases to detect and fix. It simply means that some member/variable of some reference type is dereferenced by using and of its instance (non-static) members, which requires this member/variable to be non-null, but in fact it appears to be null. Simply execute it under debugger, it will stop the execution where the exception is thrown. Put a break point on that line, restart the application and come to this point again. Evaluate all references involved in next line and see which one is null while it needs to be not null. After you figure this out, fix the code: wither make sure the member/variable is properly initialized to a non-null reference, or check it for null and, in case of null, do something else.

Please see also: want to display next record on button click. but got an error in if condition of next record function "object reference not set to an instance of an object"[^].

Good luck,
—SA


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