Extract CreateExecutable to own class

ExeLauncher/ExeGenerator.cs

@@ -0,0 +1,66 @@
+using System;
+using System.CodeDom.Compiler;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Reflection;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.CSharp;
+
+namespace ExeLauncher.GUI
+{
+    public class ExeGenerator
+    {
+        static ExeGenerator()
+        {
+            var file = Assembly.GetExecutingAssembly().GetManifestResourceStream("ExeLauncher.Code.cs");
+            var reader = new StreamReader(file);
+
+            Code = reader.ReadToEnd();
+
+            reader.Close();
+        }
+
+        const string Paths = "%Paths%";
+        const string Arguments = "%Arguments%";
+        const string WorkingDirectories = "%WorkingDirectories%";
+
+        private static string Code { get; }
+
+        private string _code;
+
+        public ExeGenerator()
+        {
+            _code = Code;
+        }
+
+        public CompilerErrorCollection CreateExecutable(string location, string paths, string arguments, string workingDirectories, string icon)
+        {
+            _code = _code.Replace(Paths, paths);
+            _code = _code.Replace(Arguments, arguments);
+            _code = _code.Replace(WorkingDirectories, workingDirectories);
+
+            using (var codeProvider = new CSharpCodeProvider())
+            {
+                var compilerParameters = new CompilerParameters()
+                {
+                    CompilerOptions = string.IsNullOrWhiteSpace(icon) ? "-target:winexe" : $" -target:winexe -win32icon:\"{icon}\"",
+                    GenerateExecutable = true,
+                    OutputAssembly = location
+                };
+                compilerParameters.ReferencedAssemblies.Add("System.dll");
+
+                var result = codeProvider.CompileAssemblyFromSource(compilerParameters, _code);
+
+                if (result.Errors.HasErrors)
+                {
+                    return result.Errors;
+                }
+            }
+
+            return null;
+        }
+
+    }
+}

ExeLauncher/ExeLauncher.csproj

@@ -66,6 +66,7 @@
   </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Include="Code.cs" />
+    <Compile Include="ExeGenerator.cs" />
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>

ExeLauncher/Program.cs

@@ -1,4 +1,5 @@
-using Microsoft.CSharp;
+using ExeLauncher.GUI;
+using Microsoft.CSharp;
 using System;
 using System.CodeDom.Compiler;
 using System.Diagnostics;
@@ -10,22 +11,11 @@ namespace ExeLauncher
 {
     public class Program
     {
-        const string Paths = "%Paths%";
-        const string Arguments = "%Arguments%";
-        const string WorkingDirectories = "%WorkingDirectories%";
 
-        static string code;
 
         [STAThread]
         static void Main(string[] args)
         {
-            var file = Assembly.GetExecutingAssembly().GetManifestResourceStream("ExeLauncher.Code.cs");
-            var reader = new StreamReader(file);
-
-            code = reader.ReadToEnd();
-
-            reader.Close();
-
             string path, arguments, workingDirectory, icon;
 
             Console.Write("Path: ");
@@ -55,43 +45,24 @@ namespace ExeLauncher
             Console.WriteLine();
             Console.WriteLine("Generating file...");
 
-            CreateExecutable(location, path, arguments, workingDirectory, icon);
+            var errors = new ExeGenerator().CreateExecutable(location, path, arguments, workingDirectory, icon);
+
+            if (errors != null)
+            {
+                Console.WriteLine("An error occured while compiling the executable: ");
+
+                foreach (var compilerError in errors)
+                {
+                    Console.WriteLine("\t{0}", compilerError.ToString());
+                    Console.WriteLine();
+                }
+            }
 
             Console.WriteLine();
             Console.WriteLine("Done.");
             Console.ReadKey(true);
         }
 
-        public static void CreateExecutable(string location, string paths, string arguments, string workingDirectories, string icon)
-        {
-            code = code.Replace(Paths, paths);
-            code = code.Replace(Arguments, arguments);
-            code = code.Replace(WorkingDirectories, workingDirectories);
-
-            using (var codeProvider = new CSharpCodeProvider())
-            {
-                var compilerParameters = new CompilerParameters()
-                {
-                    CompilerOptions = $"-target:winexe -win32icon:\"{icon}\"",
-                    GenerateExecutable = true,
-                    OutputAssembly = location
-                };
-                compilerParameters.ReferencedAssemblies.Add("System.dll");
-
-                var result = codeProvider.CompileAssemblyFromSource(compilerParameters, code);
-
-                if (result.Errors.HasErrors)
-                {
-                    Console.WriteLine("An error occured while compiling the executable: ");
-                    foreach (var compilerError in result.Errors)
-                    {
-                        Console.WriteLine("\t{0}", compilerError.ToString());
-                        Console.WriteLine();
-                    }
-                }
-            }
-        }
-
         public static string GetIcon()
         {
             var dialog = new OpenFileDialog()