使用 System.Reflection 打印所有 System.Environment 信息

Question

We have a little task to print in a console window all the variables of the Environment class using reflection , but how to do so I don't even have a clue. I am sorry if I've written anything wrong here, I'm new to C# .

Of course I could use this kind of code, but that is not what is required from me.

string machineName = System.Environment.MachineName;
Console.WriteLine(machineName);

I searched Google so much and this is what I found, but I don't think this is what I need. I don't even know what I need.

System.Reflection.Assembly info = typeof(System.Int32).Assembly;
System.Console.WriteLine(info);

Any suggestions, clues?

Answer 1

You don't need reflection here

foreach(DictionaryEntry e in System.Environment.GetEnvironmentVariables())
{
    Console.WriteLine(e.Key  + ":" + e.Value);
}

var compName = System.Environment.GetEnvironmentVariables()["COMPUTERNAME"];

Answer 2

Get the all public and static properties of Environment using GetProperties method, then display the name and the value of each property:

var properties = typeof(Environment)
                .GetProperties(BindingFlags.Public | BindingFlags.Static);

foreach(var prop in properties)
   Console.WriteLine("{0} : {1}", prop.Name, prop.GetValue(null));

Answer 3

Although it's an old question, there is a neater possible answer based on the accepted answer, using Linq:

IEnumerable<string> environmentVariables = Environment.GetEnvironmentVariables()
   .Cast<DictionaryEntry>()
   .Select(de => $"{de.Key}={de.Value}");

Console.WriteLine("Environment Variables: " + string.Join(Environment.NewLine, environmentVariables));

Or, a shorter version of the same code:

Console.WriteLine("Environment Variables: " + string.Join(Environment.NewLine, 
    Environment.GetEnvironmentVariables()
       .Cast<DictionaryEntry>()
       .Select(de => $"{de.Key}={de.Value}")));