Environment.GetEnvironmentVariable（QUOT; RoleRoot＆QUOT;）在WebRole调用时返回null [英] Environment.GetEnvironmentVariable("RoleRoot") returning null when called in a WebRole

问题描述

我有一个是由一WebRole和WorkerRole称为方法（在分离的类库）。此方法包含一个文件，该文件是使用返回 Environment.GetEnvironmentVariable（RoleRoot）的路径，如下所示：

I have a method (in a separated class library) which is called by a WebRole and a WorkerRole. This method contains the path of a file, which is returned using Environment.GetEnvironmentVariable("RoleRoot"), as follows:

private string FooPath()    
{
    string appRoot = Environment.GetEnvironmentVariable("RoleRoot");
    return Path.Combine(appRoot + @"\", @"approot\file.foo");
}

当我把这种方法从WorkerRole路径通常返回。但是，当我把它从WebRole我得到空。

When I call this method from a WorkerRole the path is returned normally. But when I call it from a WebRole I get null.

任何想法？

编辑：我使用APNS，夏普将消息传递给iOS和它需要的.p12证书才能工作。目前，我有我的类库的根（这是由两个WebRole和WorkerRole称呼）中.P12。但问题是：为什么？ RoleRoot 返回null时，我把它从WebRole但返回的路径，当我从一个WorkerRole

I am using APNS-Sharp to send push messages to iOS and it requires a .p12 certificate in order to work. Currently I have the .p12 in the root of my class library (which is called by both WebRole and WorkerRole). But the point is: Why RoleRoot returns null when I call it from a WebRole but returns the path when I call from a WorkerRole?

推荐答案

RoleRoot 因为WebRole使用IIS，就像一个正常的网站返回WebRole假的。这就是为什么它是很难从WebRole获取环境变量。

RoleRoot returns false for WebRole because the WebRole uses IIS, just like a normal website. That's why it's difficult to get Environment Variables from a WebRole.

为了正确地获取路径，我不得不使用经典和使用Server.Mappath引用斌文件夹，而不是为approot ：

In order to get the path properly I had to use the classic Server.MapPath and reference the bin folder, instead of approot:

private string FooPathWebRole()    
{
    string appRoot = HttpContext.Current.Server.MapPath(@"~\");
    return Path.Combine(appRoot + @"\", @"bin\file.foo");
}

对于WorkerRole一切都没有改变：

For the WorkerRole nothing has changed:

private string FooPathWorkerRole()    
{
    string appRoot = Environment.GetEnvironmentVariable("RoleRoot");
    return Path.Combine(appRoot + @"\", @"approot\file.foo");
}

另外，我发现Azure不导入P12证书。我将不得不把它改造成另一种格式，我不相信我会的工作。所以，最好的办法是将它们放置在应用程序的根，和纪念的生成操作以内容

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