反射 [英] Reflection
问题描述
我正在尝试使用反射来访问
OpenFileDialog fileNames属性的私有属性。我有以下代码：
filedlg.InitialDirectory = directory.Text;
filedlg.Filter =" xml files（* .xml ）| * .XML" ;
filedlg.FileName =" * .xml" ;;
filedlg.ValidateNames = false;
if（filedlg。 ShowDialog（）== DialogResult.Cancel）
返回;
类型t = filedlg.GetType（）;
PropertyInfo rowsPropertyInfo = t.GetProperty（" fileNames"，
BindingFlags.Instance |
BindingFlags.Static |
BindingFlags.GetProperty |
BindingFlags.Public |
BindingFlags.NonPublic |
BindingFlags.SuppressChangeType）;
object [] o = （object []）rowsPropertyInfo.GetValue（filedlg，
BindingFlags.Instance |
BindingFlags.Static |
BindingFlags.GetProperty |
BindingFlags.Public |
BindingFlags.NonPublic |
BindingFlags.SuppressChangeType，
null，null，null）;
我收到一个错误：
BGR中发生未处理的System.NullReferenceException类型异常eport.exe
附加信息：对象引用未设置为
对象的实例。
任意想法？谢谢。
I am trying to use reflection to access the private property of
OpenFileDialog fileNames property. I have the following code :
filedlg.InitialDirectory = directory.Text;
filedlg.Filter = "xml files (*.xml)|*.xml" ;
filedlg.FileName = "*.xml";
filedlg.ValidateNames = false;
if (filedlg.ShowDialog() == DialogResult.Cancel)
return;
Type t = filedlg.GetType();
PropertyInfo rowsPropertyInfo = t.GetProperty("fileNames",
BindingFlags.Instance |
BindingFlags.Static |
BindingFlags.GetProperty |
BindingFlags.Public |
BindingFlags.NonPublic|
BindingFlags.SuppressChangeType);
object[] o = (object[])rowsPropertyInfo.GetValue(filedlg,
BindingFlags.Instance |
BindingFlags.Static |
BindingFlags.GetProperty |
BindingFlags.Public |
BindingFlags.NonPublic|
BindingFlags.SuppressChangeType,
null, null, null);
I got an error :
An unhandled exception of type ''System.NullReferenceException'' occurred in
BGReport.exe
Additional information: Object reference not set to an instance of an
object.
Any idea ? Thanks.
推荐答案
QQ< an ******* @ discussion.microsoft.com>写道：
QQ <an*******@discussions.microsoft.com> wrote:
我试图使用反射来访问
OpenFileDialog fileNames属性的私有属性。我有以下代码：
I am trying to use reflection to access the private property of
OpenFileDialog fileNames property. I have the following code :
< snip>
请参阅我对您问半个问题的回复小时前，
并阅读 http://www.pobox.com/~skeet/csharp/faq/posting.html
-
Jon Skeet - < ; sk *** @ pobox.com>
http：//www.pobox .com / ~siget
如果回复小组，请不要给我发邮件
<snip>
Please see my response to the same question you asked half an hour ago,
and read http://www.pobox.com/~skeet/csharp/faq/posting.html
--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
属性名称上的文本案例错误。
使用FileNames，而不是fileNames。
cu
Adnan
" QQ" <一个******* @ discussions.microsoft.com>在消息新闻中写道：OD ************** @ TK2MSFTNGP11.phx.gbl ...
我试图用反射来访问<的私人财产br />
OpenFileDialog fileNames属性。我有以下代码：
filedlg.InitialDirectory = directory.Text;
filedlg.Filter =" xml files（* .xml ）| * .XML" ;
filedlg.FileName =" * .xml" ;;
filedlg.ValidateNames = false;
if（filedlg。 ShowDialog（）== DialogResult.Cancel）
返回;
类型t = filedlg.GetType（）;
PropertyInfo rowsPropertyInfo = t.GetProperty（" fileNames"，
BindingFlags.Instance |
BindingFlags.Static |
BindingFlags.GetProperty |
BindingFlags.Public |
BindingFlags.NonPublic |
BindingFlags.SuppressChangeType）;
object [] o = （object []）rowsPropertyInfo.GetValue（filedlg，
BindingFlags.Instance |
BindingFlags.Static |
BindingFlags.GetProperty |
BindingFlags.Public |
BindingFlags.NonPublic |
BindingFlags.SuppressChangeType，
null，null，null）;
我收到一个错误：
BGR中发生未处理的System.NullReferenceException类型异常eport.exe
附加信息：对象引用未设置为
对象的实例。
任意想法？谢谢。
Hi,
Wrong text case on property name.
Use "FileNames", and not "fileNames".
cu
Adnan
"QQ" <an*******@discussions.microsoft.com> wrote in message news:OD**************@TK2MSFTNGP11.phx.gbl...
I am trying to use reflection to access the private property of
OpenFileDialog fileNames property. I have the following code :
filedlg.InitialDirectory = directory.Text;
filedlg.Filter = "xml files (*.xml)|*.xml" ;
filedlg.FileName = "*.xml";
filedlg.ValidateNames = false;
if (filedlg.ShowDialog() == DialogResult.Cancel)
return;
Type t = filedlg.GetType();
PropertyInfo rowsPropertyInfo = t.GetProperty("fileNames",
BindingFlags.Instance |
BindingFlags.Static |
BindingFlags.GetProperty |
BindingFlags.Public |
BindingFlags.NonPublic|
BindingFlags.SuppressChangeType);
object[] o = (object[])rowsPropertyInfo.GetValue(filedlg,
BindingFlags.Instance |
BindingFlags.Static |
BindingFlags.GetProperty |
BindingFlags.Public |
BindingFlags.NonPublic|
BindingFlags.SuppressChangeType,
null, null, null);
I got an error :
An unhandled exception of type ''System.NullReferenceException'' occurred in
BGReport.exe
Additional information: Object reference not set to an instance of an
object.
Any idea ? Thanks.
属性名称上的文本大小错误。
使用FileNames，而不是"文件名" ;.
cu
Adnan
" QQ" <一个******* @ discussions.microsoft.com>在消息新闻中写道：OD ************** @ TK2MSFTNGP11.phx.gbl ...
我试图用反射来访问<的私人财产br />
OpenFileDialog fileNames属性。我有以下代码：
filedlg.InitialDirectory = directory.Text;
filedlg.Filter =" xml files（* .xml ）| * .XML" ;
filedlg.FileName =" * .xml" ;;
filedlg.ValidateNames = false;
if（filedlg。 ShowDialog（）== DialogResult.Cancel）
返回;
类型t = filedlg.GetType（）;
PropertyInfo rowsPropertyInfo = t.GetProperty（" fileNames"，
BindingFlags.Instance |
BindingFlags.Static |
BindingFlags.GetProperty |
BindingFlags.Public |
BindingFlags.NonPublic |
BindingFlags.SuppressChangeType）;
object [] o = （object []）rowsPropertyInfo.GetValue（filedlg，
BindingFlags.Instance |
BindingFlags.Static |
BindingFlags.GetProperty |
BindingFlags.Public |
BindingFlags.NonPublic |
BindingFlags.SuppressChangeType，
null，null，null）;
我收到一个错误：
BGR中发生未处理的System.NullReferenceException类型异常eport.exe
附加信息：对象引用未设置为
对象的实例。
任意想法？谢谢。
Hi,
Wrong text case on property name.
Use "FileNames", and not "fileNames".
cu
Adnan
"QQ" <an*******@discussions.microsoft.com> wrote in message news:OD**************@TK2MSFTNGP11.phx.gbl...
I am trying to use reflection to access the private property of
OpenFileDialog fileNames property. I have the following code :
filedlg.InitialDirectory = directory.Text;
filedlg.Filter = "xml files (*.xml)|*.xml" ;
filedlg.FileName = "*.xml";
filedlg.ValidateNames = false;
if (filedlg.ShowDialog() == DialogResult.Cancel)
return;
Type t = filedlg.GetType();
PropertyInfo rowsPropertyInfo = t.GetProperty("fileNames",
BindingFlags.Instance |
BindingFlags.Static |
BindingFlags.GetProperty |
BindingFlags.Public |
BindingFlags.NonPublic|
BindingFlags.SuppressChangeType);
object[] o = (object[])rowsPropertyInfo.GetValue(filedlg,
BindingFlags.Instance |
BindingFlags.Static |
BindingFlags.GetProperty |
BindingFlags.Public |
BindingFlags.NonPublic|
BindingFlags.SuppressChangeType,
null, null, null);
I got an error :
An unhandled exception of type ''System.NullReferenceException'' occurred in
BGReport.exe
Additional information: Object reference not set to an instance of an
object.
Any idea ? Thanks.
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