The Idea
I want players to be able to interact with the game through C# scripting.
Everything works in the editor (go ahead an try it), but not when I “build” the game.
This is the error (exception message) I see:
The Error Message
An exception was thrown by the type initializer for Mono.CSharp.CSharpCodeCompiler System
at Microsoft.CSharp.CSharpCodeProvider.CreateCompiler ()
[0x00000] in :0
at System.CodeDom.Compiler.CodeDomProvider.CompileAssemblyFromSource (System.CodeDom.Compiler.CompilerParameters options, System.String fileNames) [0x00000] in :0
at ScriptEditor.Compile () [0x00000] in :0
The Code
To Run this script in your game:
- Create a C# script file "ScriptEditor.cs "
- Paste this code.
- Attach to any game object
- In Build Settings->Player Settings, change “.NET 2.0 Subset” to “.NET 2.0”
using UnityEngine;
using System;
using System.Text;
using System.Collections;
using System.Reflection;
using System.CodeDom;
using System.CodeDom.Compiler;
using Microsoft.CSharp;
/// <summary>
/// ScriptEditor.cs (Attach this to any game object)
/// Useage Notes:
/// For this to run, you MUST:
/// 1. Go to File-->Build Settings...
/// 2. Click "Player Settings..."
/// 3. "Other Settings"
/// 4. "Optimization"-->"API Compatability Level"
/// 5. Change from ".NET 2.0 Subset" --> ".NET 2.0"
/// </summary>
public class ScriptEditor : MonoBehaviour
{
void Update()
{
// Dont run our script until it has been COMPILED successfully.
if(myScript_Type == null || myScript_Instance == null) return;
// Run the script's Update() function
myScript_Type.InvokeMember("Update",BindingFlags.InvokeMethod | BindingFlags.Instance | BindingFlags.Public, null, myScript_Instance, null);
// Read the scripts "readme" variable.
PropertyInfo readmePropertyInfo = myScript_Type.GetProperty("readme"); // Source: http://www.csharp-examples.net/reflection-examples/
readme = (string)readmePropertyInfo.GetValue(myScript_Instance, null);
}
private string scriptText =
@"using System;
using System.Collections.Generic;
public class MyScript
{
public string readme {get;set;} // Our unity program will read this variable.
private int counter = 0;
public MyScript() // Constructor
{
readme = """";
}
public void Update() // Our unity game will run this function.
{
counter++;
readme = ""Hi! Script is Running! "" + counter + ""
“”;
}
}
";
private string readme = ""; // Displayed on the GUI
private string compilerErrorMessages = ""; // Displayed on the GUI
void OnGUI()
{
// ********** Display the script in Unity
scriptText = GUI.TextArea(new Rect(10, 10, 700, 500), scriptText);
// ********** Compile your script
if (GUI.Button(new Rect(720, 10, 300, 30), "Compile and Run"))
{
Compile (); // Compile the script. Write errors to "compilerErrorMessages", if any.
}
// ********** Display any compiler errors
GUI.TextArea(new Rect(10, 510, 700, 50), compilerErrorMessages); // The console for displaying errors.
// ********** Display the Script's Output.
GUI.TextArea (new Rect(720, 50, 300, 30), readme);
}
private Assembly generatedAssembly; // Compiled code is called an "Assembly"
private Type myScript_Type = null; // These two variables are used run the compiled code.
private object myScript_Instance = null; // These two variables are used run the compiled code.
private void Compile()
{
try
{
compilerErrorMessages = ""; // clear any previous messages
// ********** Create an instance of the C# compiler
CSharpCodeProvider codeProvider = new CSharpCodeProvider();
// ********** add compiler parameters
CompilerParameters compilerParams = new CompilerParameters();
compilerParams.CompilerOptions = "/target:library /optimize /warn:0";
compilerParams.GenerateExecutable = false;
compilerParams.GenerateInMemory = true;
compilerParams.IncludeDebugInformation = false;
compilerParams.ReferencedAssemblies.Add("System.dll");
compilerParams.ReferencedAssemblies.Add("System.Core.dll");
// ********** actually compile the code ??????? THIS LINE WORKS IN UNITY EDITOR --- BUT NOT IN BUILD ??????????
CompilerResults results = codeProvider.CompileAssemblyFromSource(compilerParams,scriptText);
// ********** Do we have any compiler errors
if (results.Errors.Count > 0)
{
foreach (CompilerError error in results.Errors)
compilerErrorMessages = compilerErrorMessages + error.ErrorText + '
';
}
else
{
// ********** get a hold of the actual assembly that was generated
generatedAssembly = results.CompiledAssembly;
if(generatedAssembly != null)
{
// get type of class Calculator from just loaded assembly
myScript_Type = generatedAssembly.GetType("MyScript");
// create instance of class MyScript
myScript_Instance = Activator.CreateInstance(myScript_Type);
// Say success!
compilerErrorMessages = "Success!";
}
}
}
catch(Exception o)
{
compilerErrorMessages = ""+o.Message +"
“+ o.Source +”
“+ o.StackTrace +”
";
}
}
}
