托管DLL方法在安装程序中失败

Question

好的，我有下面的类库，我用C#写的：

public class Program
{
    public void GetProductID(string location, out string productId)
    {
        ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM Win32_Product");
        ManagementObjectCollection collection = searcher.Get();
        var item = new Win32Product();
        //var crap = (collection as IEnumerable<ManagementObject>).Where(o => o["InstallLocation"].ToString().StartsWith(location));
        foreach (ManagementObject obj in collection)
        {
            try
            {
                item = new Win32Product();
                item.IdentifyingNumber = (string)obj["IdentifyingNumber"];
                item.InstallLocation = (string)obj["InstallLocation"];
                item.Name = (string)obj["Name"];
            }
            catch
            { }  //shut up. I know it's an empty catch block. Its fine.
                 //If there are exceptions thrown, I don't want the data, I just
                 //want to keep running.
        }
        productId = item.ProductID.ToString();
    }        
} 

public class Win32Product
{
   //properties
}

这并不重要，GetProductId()只是搜索给定目录下的任何已安装的程序。如果我在其他地方测试它，它可以工作得很好，但是当从installshield (作为控制事件)运行时，它失败了(返回值3)。

我想，这是一个模糊的问题，但是你知道为什么GetProductInfo()会因为安装失败而失败吗？

Answer 1

这里有一些给你的阅读材料：

Deployment Tools Foundation (DTF) Managed Custom Actions

Reasons DTF is Better

顺便说一句，Win32_Product类是一个POS机。它在包装底层MSI API方面做得非常糟糕。切换到DTF时，请改用ProductInstallation::GetProducts方法。它在调用MsiEnumProductsEx方面做得要好得多。