本文整理匯總了C#中System.Environment.GetEnvironmentVariables方法的典型用法代碼示例。如果您正苦於以下問題：C# Environment.GetEnvironmentVariables方法的具體用法？C# Environment.GetEnvironmentVariables怎麽用？C# Environment.GetEnvironmentVariables使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類System.Environment的用法示例。
在下文中一共展示了Environment.GetEnvironmentVariables方法的3個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的C#代碼示例。
示例1: Main
// Sample for the Environment.GetEnvironmentVariables method
using System;
using System.Collections;
class Sample
{
public static void Main()
{
Console.WriteLine();
Console.WriteLine("GetEnvironmentVariables: ");
foreach (DictionaryEntry de in Environment.GetEnvironmentVariables())
Console.WriteLine(" {0} = {1}", de.Key, de.Value);
}
}
// Output from the example is not shown, since it is:
// Lengthy.
// Specific to the machine on which the example is run.
// May reveal information that should remain secure.示例2: Main
//引入命名空間
using System;
using System.Collections;
using Microsoft.Win32;
class Sample
{
public static void Main()
{
// Environment variable names for default, process, user, and machine targets.
string defaultEnvVar = nameof(defaultEnvVar);
string processEnvVar = nameof(processEnvVar);
string userEnvVar = nameof(userEnvVar);
string machineEnvVar = nameof(machineEnvVar);
string dft = nameof(dft);
string process = nameof(process);
string user = nameof(user);
string machine = nameof(machine);
// Set the environment variable for each target.
Console.WriteLine("Setting environment variables for each target...\n");
// The default target (the current process).
Environment.SetEnvironmentVariable(defaultEnvVar, dft);
// The current process.
Environment.SetEnvironmentVariable(processEnvVar, process,
EnvironmentVariableTarget.Process);
// The current user.
Environment.SetEnvironmentVariable(userEnvVar, user,
EnvironmentVariableTarget.User);
// The local machine.
Environment.SetEnvironmentVariable(machineEnvVar, machine,
EnvironmentVariableTarget.Machine);
// Define an array of environment variables.
string[] envVars = { defaultEnvVar,processEnvVar, userEnvVar, machineEnvVar };
// Try to get the environment variables from each target.
// The default (no specified target).
Console.WriteLine("Retrieving environment variables from the default target:");
foreach (var envVar in envVars)
{
var value = Environment.GetEnvironmentVariable(envVar) ?? "(none)";
Console.WriteLine($" {envVar}: {value}");
}
// The process block.
Console.WriteLine("\nRetrieving environment variables from the Process target:");
foreach (var envVar in envVars)
{
var value = Environment.GetEnvironmentVariable(envVar, EnvironmentVariableTarget.Process) ?? "(none)";
Console.WriteLine($" {envVar}: {value}");
}
// The user block.
Console.WriteLine("\nRetrieving environment variables from the User target:");
foreach (var envVar in envVars)
{
var value = Environment.GetEnvironmentVariable(envVar, EnvironmentVariableTarget.User) ?? "(none)";
Console.WriteLine($" {envVar}: {value}");
}
// The machine block.
Console.WriteLine("\nRetrieving environment variables from the Machine target:");
foreach (var envVar in envVars)
{
var value = Environment.GetEnvironmentVariable(envVar, EnvironmentVariableTarget.Machine) ?? "(none)";
Console.WriteLine($" {envVar}: {value}");
}
// Delete the environment variable for each target.
Console.WriteLine("\nDeleting environment variables for each target...\n");
// The default target (the current process).
Environment.SetEnvironmentVariable(defaultEnvVar, null);
// The current process.
Environment.SetEnvironmentVariable(processEnvVar, null,
EnvironmentVariableTarget.Process);
// The current user.
Environment.SetEnvironmentVariable(userEnvVar, null,
EnvironmentVariableTarget.User);
// The local machine.
Environment.SetEnvironmentVariable(machineEnvVar, null,
EnvironmentVariableTarget.Machine);
}
}輸出：
Setting environment variables for each target... Retrieving environment variables from the default target: defaultEnvVar: dft processEnvVar: process userEnvVar: user machineEnvVar: (none) Retrieving environment variables from the Process target: defaultEnvVar: dft processEnvVar: process userEnvVar: user machineEnvVar: (none) Retrieving environment variables from the User target: defaultEnvVar: (none) processEnvVar: (none) userEnvVar: user machineEnvVar: (none) Retrieving environment variables from the Machine target: defaultEnvVar: (none) processEnvVar: (none) userEnvVar: (none) machineEnvVar: machine Deleting environment variables for each target... The example displays the following output if run on a Unix-based system: Setting environment variables for each target... Retrieving environment variables from the default target: defaultEnvVar: dft processEnvVar: process userEnvVar: (none) machineEnvVar: (none) Retrieving environment variables from the Process target: defaultEnvVar: dft processEnvVar: process userEnvVar: (none) machineEnvVar: (none) Retrieving environment variables from the User target: defaultEnvVar: (none) processEnvVar: (none) userEnvVar: (none) machineEnvVar: (none) Retrieving environment variables from the Machine target: defaultEnvVar: (none) processEnvVar: (none) userEnvVar: (none) machineEnvVar: (none) Deleting environment variables for each target...
示例3: Environment.GetEnvironmentVariables()
//引入命名空間
using System;
using System.Collections;
class MainClass
{
public static void Main()
{
Console.WriteLine("Environment Variables");
foreach (DictionaryEntry var in Environment.GetEnvironmentVariables())
Console.WriteLine("{0}={1}", var.Key, var.Value);
}
}