环境变量 <environmentVariables>

项目
03/14/2024

概述

<applicationPools> 的 <environmentVariables> 元素/<add> 元素指定 Internet Information Services (IIS) 10 在启动应用程序时传递给工作进程的环境变量列表。 <environmentVariables> 元素包含 <add> 元素的集合，这些元素定义每个环境变量的各个名称/值对。

兼容性

版本	说明
IIS 10.0	`<environmentVariables>` 元素是在 IIS 10 中引入的。
IIS 8.0	空值
IIS 7.5	空值
IIS 7.0	空值
IIS 6.0	空值

安装

<environmentVariables> 元素包含在 IIS 10 的默认安装中。

操作方式

没有用于为 IIS 10 设置环境变量的用户界面。有关如何以编程方式设置环境变量的示例，请参阅本文档的代码示例一节。

配置

特性

无。

子元素

元素	说明
`add`	可选元素。将环境变量添加到环境变量集合中。
`remove`	可选元素。从环境变量集合中删除环境变量。

配置示例

以下示例将环境变量添加到应用程序池。

<applicationPools>
   <add name="Contoso" managedRuntimeVersion="v4.0" managedPipelineMode="Classic">
      <environmentVariables>
         <add name="foo" value="bar" />
      </environmentVariables>
   </add>
</applicationPools>

代码示例

以下示例演示如何向环境变量集合添加名称/值对。

AppCmd.exe

appcmd.exe set config -section:system.applicationHost/applicationPools /+"[name='Contoso'].environmentVariables.[name='foo',value='bar']" /commit:apphost

C#

using System;
using System.Text;
using Microsoft.Web.Administration;

internal static class Sample {
   private static void Main() {
      using(ServerManager serverManager = new ServerManager()) { 
         Configuration config = serverManager.GetApplicationHostConfiguration();
         ConfigurationSection applicationPoolsSection = config.GetSection("system.applicationHost/applicationPools");
         ConfigurationElementCollection applicationPoolsCollection = applicationPoolsSection.GetCollection();
         ConfigurationElement addElement = FindElement(applicationPoolsCollection, "add", "name", @"Contoso");
         if (addElement == null) throw new InvalidOperationException("Element not found!");
         ConfigurationElementCollection environmentVariablesCollection = addElement.GetCollection("environmentVariables");
         ConfigurationElement addElement1 = environmentVariablesCollection.CreateElement("add");
         addElement1["name"] = @"foo";
         addElement1["value"] = @"bar";
         environmentVariablesCollection.Add(addElement1);
         serverManager.CommitChanges();
      }
   }
   private static ConfigurationElement FindElement(ConfigurationElementCollection collection, string elementTagName, params string[] keyValues)
   {
      foreach (ConfigurationElement element in collection)
      {
         if (String.Equals(element.ElementTagName, elementTagName, StringComparison.OrdinalIgnoreCase))
         {
            bool matches = true;
            for (int i = 0; i < keyValues.Length; i += 2)
            {
               object o = element.GetAttributeValue(keyValues[i]);
               string value = null;
               if (o != null)
               {
                  value = o.ToString();
               }
               if (!String.Equals(value, keyValues[i + 1], StringComparison.OrdinalIgnoreCase))
               {
                  matches = false;
                  break;
               }
            }
            if (matches)
            {
               return element;
            }
         }
      }
      return null;
   }
}

VB.NET

Imports System
Imports System.Text
Imports Microsoft.Web.Administration

Class Sample
   
   Private Shared Sub Main()
      Dim serverManager As ServerManager = New ServerManager
      Dim config As Configuration = serverManager.GetApplicationHostConfiguration
      Dim applicationPoolsSection As ConfigurationSection = config.GetSection("system.applicationHost/applicationPools")
      Dim applicationPoolsCollection As ConfigurationElementCollection = applicationPoolsSection.GetCollection
      Dim addElement As ConfigurationElement = FindElement(applicationPoolsCollection, "add", "name", "Contoso")
      If (addElement Is Nothing) Then
         Throw New InvalidOperationException("Element not found!")
      End If
      Dim environmentVariablesCollection As ConfigurationElementCollection = addElement.GetCollection("environmentVariables")
      Dim addElement1 As ConfigurationElement = environmentVariablesCollection.CreateElement("add")
      addElement1("name") = "foo"
      addElement1("value") = "bar"
      environmentVariablesCollection.Add(addElement1)
      serverManager.CommitChanges
   End Sub

   Private Function FindElement(ByVal collection As ConfigurationElementCollection, ByVal elementTagName As String, ByVal ParamArray keyValues() As String) As ConfigurationElement
      For Each element As ConfigurationElement In collection
         If String.Equals(element.ElementTagName, elementTagName, StringComparison.OrdinalIgnoreCase) Then
            Dim matches As Boolean = True
            Dim i As Integer
            For i = 0 To keyValues.Length - 1 Step 2
               Dim o As Object = element.GetAttributeValue(keyValues(i))
               Dim value As String = Nothing
               If (Not (o) Is Nothing) Then
                  value = o.ToString
               End If
               If Not String.Equals(value, keyValues((i + 1)), StringComparison.OrdinalIgnoreCase) Then
                  matches = False
                  Exit For
               End If
            Next
            If matches Then
               Return element
            End If
         End If
      Next
      Return Nothing
   End Function

End Class

JavaScript

var adminManager = new ActiveXObject('Microsoft.ApplicationHost.WritableAdminManager');
adminManager.CommitPath = "MACHINE/WEBROOT/APPHOST";
var applicationPoolsSection = adminManager.GetAdminSection("system.applicationHost/applicationPools", "MACHINE/WEBROOT/APPHOST");
var applicationPoolsCollection = applicationPoolsSection.Collection;
var addElementPos = FindElement(applicationPoolsCollection, "add", ["name", "Contoso"]);
if (addElementPos == -1) throw "Element not found!";

var addElement = applicationPoolsCollection.Item(addElementPos);
var environmentVariablesCollection = addElement.ChildElements.Item("environmentVariables").Collection;

var addElement1 = environmentVariablesCollection.CreateNewElement("add");
addElement1.Properties.Item("name").Value = "foo";
addElement1.Properties.Item("value").Value = "bar";
environmentVariablesCollection.AddElement(addElement1);

adminManager.CommitChanges();

function FindElement(collection, elementTagName, valuesToMatch) {
   for (var i = 0; i < collection.Count; i++) {
      var element = collection.Item(i);
      if (element.Name == elementTagName) {
         var matches = true;
         for (var iVal = 0; iVal < valuesToMatch.length; iVal += 2) {
            var property = element.GetPropertyByName(valuesToMatch[iVal]);
            var value = property.Value;
            if (value != null) {
               value = value.toString();
            }
            if (value != valuesToMatch[iVal + 1]) {
               matches = false;
               break;
            }
         }
         if (matches) {
            return i;
         }
      }
   }
   return -1;
}

VBScript

Set adminManager = CreateObject("Microsoft.ApplicationHost.WritableAdminManager")
adminManager.CommitPath = "MACHINE/WEBROOT/APPHOST"
Set applicationPoolsSection = adminManager.GetAdminSection("system.applicationHost/applicationPools", "MACHINE/WEBROOT/APPHOST")
Set applicationPoolsCollection = applicationPoolsSection.Collection

addElementPos = FindElement(applicationPoolsCollection, "add", Array("name", "Contoso"))
If addElementPos = -1 Then
   WScript.Echo "Element not found!"
   WScript.Quit
End If

Set addElement = applicationPoolsCollection.Item(addElementPos)
Set environmentVariablesCollection = addElement.ChildElements.Item("environmentVariables").Collection

Set addElement1 = environmentVariablesCollection.CreateNewElement("add")
addElement1.Properties.Item("name").Value = "foo"
addElement1.Properties.Item("value").Value = "bar"
environmentVariablesCollection.AddElement(addElement1)

adminManager.CommitChanges()

Function FindElement(collection, elementTagName, valuesToMatch)
   For i = 0 To CInt(collection.Count) - 1
      Set element = collection.Item(i)
      If element.Name = elementTagName Then
         matches = True
         For iVal = 0 To UBound(valuesToMatch) Step 2
            Set property = element.GetPropertyByName(valuesToMatch(iVal))
            value = property.Value
            If Not IsNull(value) Then
               value = CStr(value)
            End If
            If Not value = CStr(valuesToMatch(iVal + 1)) Then
               matches = False
               Exit For
            End If
         Next
         If matches Then
            Exit For
         End If
      End If
   Next
   If matches Then
      FindElement = i
   Else
      FindElement = -1
   End If
End Function