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Thursday, July 12, 2007

Using the Environment Class


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Environment: .NET, C#

The .NET Framework takes a much different approach to the Environment than Windows. There is a class called Environment, part of the System namespace. The documentation states:

Use this class to retrieve the following information:

  • Command line arguments
  • Exit codes
  • Environment variable settings
  • Contents of the call stack
  • Time since last system boot
  • Version of the common language runtime

Besides getting all or a particular environment variable(s), there are other objects available. Most objects are read only, and there is no method to set or add a variable. As far as I can tell, only CurrentDirectory and ExitCode can be changed. There is no method to add or modify the environment variables. The most interesting thing I noticed when coding the example C# program was the way GetEnvironmentVariables() worked. The method returns an IDictionary object that represents a collection of key-and-value pairs. Another interesting method is GetFolderPath, which retrieves paths to various system folders.

//-----------------------------------------------------------

The following is a C# example of how to retrieve all environment variables.

case 0:
IDictionary id;
String sString;

ArrayList values = new ArrayList();

m_env_list.Items.Clear ();
id = Environment.GetEnvironmentVariables();
foreach (DictionaryEntry myEntry in id)
{
sString = myEntry.Key.ToString();
sString += "=";
sString += myEntry.Value.ToString();
m_env_list.Items.Add(sString);
}
m_env_list.SetSelected(0, true);
m_env_list_SelectedIndexChanged(this,null);
break;
//-----------------------------------------------------------

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