将程序集的基本路径从bin目录更改为其他目录

Question

I have a Test.cs file in C:\\ This test file reads from an input file and writes the same to an output file. Test.cs

public class Test
{
    public static int Main(string[] args)
    {
        var reader = new StreamReader("in.txt");
        string input = reader.ReadLine();
        var writer = new StreamWriter("out.txt");
        writer.WriteLine(input);
        return 0;
     }
 }

Here it should be noted that the code only uses the filename and not the full file path , which means the file is expected to be in the directory where the program is running. And I have created the in.txt in C:\\

Now, there is ac# code called Runner.cs in a solution in C:\\Project\\Runner.cs , that dynamically compiles the Test.cs code and runs it using reflection. Now, when the Test.cs runs, it expects the in.txt file to be in C:\\Project\\bin\\Debug\\in.txt , but it is actually present in C:\\in.txt

So, my question is, is there a way to make the code to get the file from C:\\in.txt and not from the bin directory without changing the path of the file in the Test.cs code file.

Edit: It is my bad that I forgot to mention why I am in need of this requirement.

The Test.cs file comes from over the wire. And I felt it will not be a good choice to edit this file and set the file path accordingly. I want to compile it and run it as it is.

I hope I am clear. If not, please feel free to ask for more information.

Answer 1

If it is as simple as you show in your code switching the CurrentDirectory works for this example:

var mainMembers = new CSharpCodeProvider()
    .CreateCompiler()
    .CompileAssemblyFromSource(
        new CompilerParameters { GenerateInMemory = true }
        , @"
        using System; 
        using System.IO;
        public class M {
            public static int Main() { 
                Console.WriteLine(""CurDir = ""+ Environment.CurrentDirectory); 
                var reader = new StreamReader(""in.txt"");
                string input = reader.ReadLine();
                var writer = new StreamWriter(""out.txt"");
                writer.WriteLine(input);
                return 0;
            }
        }")
     .CompiledAssembly
     .GetType("M")
     .GetMember("Main");
 // inspect
 Environment.CurrentDirectory.Dump("current");
 // keep 
 var oldcd = Environment.CurrentDirectory;
 // switch
 Environment.CurrentDirectory = "c:\\temp";
 // invoke external code
 ((MethodInfo) mainMembers[0]).Invoke(null,null);
 // restore
 Environment.CurrentDirectory = oldcd;

In a multi threaded scenario this becomes unreliable.