OdbcDataReader引发AccessViolationException [英] OdbcDataReader throws AccessViolationException

问题描述

大家好，

我正在使用C#4.0创建一个应用程序，该应用程序确实从Oracle数据库的所有表中进行选择.对于大多数表，代码执行正常.但是，我收到一条错误消息:未处理AccessViolationException:尝试读取或写入受保护的内存.这通常表明其他内存已损坏."在OdbcDataReader.HasRows属性中.我添加了try catch块，但是应用程序仍然停止并且没有进入catch部分.

这是一段代码:

Hi all,

I am creating an application using C# 4.0 that do select from all tables in Oracle database. For most tables, the code performs okay. However, I got an error saying "AccessViolationException was unhandled: Attempted to read or write protected memory. This is often an indication that other memory is corrupt." in the OdbcDataReader.HasRows property. I added try catch block, but the application still stops and not entering the catch section.

Here is the piece of code:

public void Execute(string query, ref List<String> columnNames, ref Dictionary<int, String> rows)
{
    OdbcCommand odbcCommand;
    OdbcDataReader odbcDataReader;

    try
    {
        odbcCommand = _odbcConnection.CreateCommand();
        odbcCommand.CommandText = query;

        // right after executing this line of code, the OdbcDataReader.HasRows threw an exception
        odbcDataReader = odbcCommand.ExecuteReader();

     // ... other lines of code

注意:当我使用TOAD for Oracle进行查询时，该表没有任何行.

任何想法如何解决此问题?

Note: when I do query using TOAD for Oracle, the table does not have any rows.

Any ideas how to solve this problem?

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