在SSIS脚本任务静态构造函数中访问可配置的值 [英] Accessing a Configurable Value in an SSIS Script Task Static Constructor
问题描述
我有一个SSIS程序包,其中包含一个脚本任务,该脚本任务需要一个第三方程序集.由于不允许将该程序集放置在SSIS服务器上的GAC中,因此我在运行时将程序集绑定到脚本任务的静态构造函数中.此
I have an SSIS package with a script task that needs a 3rd party assembly. Since I am not allowed to place this assembly in the GAC on the SSIS server, I am binding the assembly at run time in the static constructor of the script task. This article is what I used as a guideline. However I want to find a way to avoid hardcoding the path to the assembly file.
我的工作代码如下:
static ScriptMain()
{
AppDomain.CurrentDomain.AssemblyResolve += new ResolveEventHandler(CurrentDomain_AssemblyResolve);
}
static System.Reflection.Assembly CurrentDomain_AssemblyResolve(object sender, ResolveEventArgs args)
{
if (args.Name.Contains("thirdparty"))
{
string path = @"C:\mydrive\Solution\Reference";
return System.Reflection.Assembly.LoadFile(System.IO.Path.Combine(path, "thirdparty.dll"));
}
return null;
}
我尝试过的事情:
1)将路径设置为包变量.这是行不通的,因为在静态构造函数运行时Dts对象尚未实例化,因此无法访问包变量.
1) Setting the path as a package variable. This doesn't work because the Dts object is not yet instantiated when the static constructor runs so there is no access to the package variables.
2)尝试访问正在触发程序集解析事件的应用程序域,如下所示:
2) Tried accessing the app domain that is firing the assembly resolve event like this:
string appDomainPath = ((AppDomain)sender).BaseDirectory;
但这只是获取VSTA代码所在的目录.
But this just gets the directory where the VSTA code lives.
我没主意了.这有可能吗?
I'm out of ideas. Is this even possible?
推荐答案
可以使用Environment将包变量潜入静态构造函数中:
It is possible to make use of Environment to sneak a package variable into the static constructor:
在初始化"脚本任务中,Main():
In an "Initialization" Script Task, Main():
Environment.SetEnvironmentVariable("LIBRARY_PATH", Dts.Variables["$Package::LIBRARY_PATH"].Value.ToString(), EnvironmentVariableTarget.Process);
然后在将来的脚本组件/任务中的任何地方
Then anywhere in future Script Component/Task
static System.Reflection.Assembly CurrentDomain_AssemblyResolve(object sender, ResolveEventArgs args)
{
string library_path = Environment.GetEnvironmentVariable("LIBRARY_PATH", EnvironmentVariableTarget.Process);
/* ...
... */
}
注意:
- 首选使用包变量,因为它可以根据环境进行覆盖并通过SQL Server代理进行设置:
- 在不需要组装的初始Task中,我们将路径粘贴到EnvironmentVariable中,并使用具有DTS访问权限的Main()限制进程(以防止泄漏到其他并发执行中).
- 仅此而已,现在您可以收获更多...我们的库路径将在其他所有下游任务中的静态构造函数中访问.
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