c# - 在C#中处理来自非托管DLL的异常

我用c编写了以下函数#

public static string GetNominativeDeclension(string surnameNamePatronimic)
{
    if(surnameNamePatronimic == null)
       throw new ArgumentNullException("surnameNamePatronimic");

IntPtr[] ptrs = null;
try
{
    ptrs = StringsToIntPtrArray(surnameNamePatronimic);

    int resultLen = MaxResultBufSize;
    int err = decGetNominativePadeg(ptrs[0], ptrs[1], ref resultLen);
    ThrowException(err);
    return IntPtrToString(ptrs, resultLen);
}
catch
{
    return surnameNamePatronimic;
}
finally
{
    FreeIntPtr(ptrs);
}

}
函数decGetNotifivePadeg位于非托管dll中

[DllImport("Padeg.dll", EntryPoint = "GetNominativePadeg")]
private static extern Int32 decGetNominativePadeg(IntPtr surnameNamePatronimic,
    IntPtr result, ref Int32 resultLength);

并抛出一个异常：
Attempted to read or write protected memory. This is often an indication that other memory is corrupt。
C代码中的捕获实际上并没有捕获它。为什么？如何处理此异常？
谢谢你的帮助！
            
            
            最佳答案            
            
            
“CLR不再将损坏进程状态的异常传递给托管代码中的异常处理程序。”
.NET Framework 4 Migration Issues。
只需将此添加到配置文件：
http://msdn.microsoft.com/en-us/library/dd638517.aspx