问题描述
你好，
我仍然是C＃的新手，并且想从
TreeNode派生来扩展TreeNode类。这是测试程序：
我在第0077行收到错误说：
"发生了'System.InvalidCastException'类型的未处理异常
inheritance.exe中的
附加信息：已指定演员无效。
请帮助，谢谢。
-
Mark Allison，SQL服务器MVP
寻找SQL Server复制书？
Hi there,
I''m still very much a newbie to C#, and would like to derive from
TreeNode to extend the TreeNode class. Here''s test program:
http://www.vkarlsen.no/pastebin/default.asp?id=4090
I get an error on line 0077 saying:
"An unhandled exception of type ''System.InvalidCastException'' occurred
in inheritance.exe
Additional information: Specified cast is not valid."
Please help, thanks.
--
Mark Allison, SQL Server MVP
http://www.markallison.co.uk
Looking for a SQL Server replication book?
http://www.nwsu.com/0974973602m.html
推荐答案
你正在添加一个TreeNodeEx，还有一个直的TreeNode - 和
，这是在tvwTest_AfterSelect中立即使用的那个。
-
Jon Skeet - < sk *** @ pobox.com>
如果回复该群组，请不要给我发邮件
You''re adding one TreeNodeEx, but also one straight TreeNode - and
that''s the one which is immediately being used in tvwTest_AfterSelect.
--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
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