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using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Text;
using System.CodeDom;
using System.CodeDom.Compiler;
using System.Runtime.Remoting;
using System.IO;
using Microsoft.CSharp;
namespace CodeDomAssistant
{
/// <summary>
/// Execute a CSharp Code Snippet and return results
/// </summary>
public class CSharpSnippet
{
List<string> assemblies = new List<string>();
List<string> namespaces = new List<string>();
CompilerParameters parameters = new CompilerParameters();
string codesnippet = string.Empty;
public CSharpSnippet(string codesnippet)
{
this.codesnippet = codesnippet;
parameters.ReferencedAssemblies.Add("System.dll");
parameters.ReferencedAssemblies.Add("RemoteLoader.dll");
namespaces.Add("System");
namespaces.Add("System.Reflection");
namespaces.Add("RemoteLoader");
}
/// <summary>
/// List of Referenced Assemblies Needed To Run Snippet
/// </summary>
public StringCollection ReferencedAssemblies
{
get { return parameters.ReferencedAssemblies; }
}
/// <summary>
/// List of Namespaces
/// </summary>
public List<string> Namespaces
{
get { return namespaces; }
}
/// <summary>
/// Execute Snippet Method
/// </summary>
/// <param name="method"></param>
/// <param name="args"></param>
/// <returns></returns>
public object Execute(string method, params object[] args)
{
object results = null;
AppDomain appdomain = null;
string script_assembly = "script_" + Guid.NewGuid().ToString();
try
{
// Build Assembly Code
StringBuilder sb = new StringBuilder();
StringWriter sw = new StringWriter(sb);
foreach (string ns in this.namespaces) {
sw.WriteLine("using " + ns + ";");
}
sw.WriteLine();
sw.WriteLine("namespace CodeDomAssistant.Script {");
sw.WriteLine(" // Encapsulate Code Snippet Script");
sw.WriteLine(" public class CodeSnippet : MarshalByRefObject, IRemoteInterface {");
sw.WriteLine(" // Invoke Method Through IRemoteInterface");
sw.WriteLine(" public object Invoke(string method, object[] parms) {");
sw.WriteLine(" return this.GetType().InvokeMember(method, BindingFlags.InvokeMethod, null, this, parms);");
sw.WriteLine(" }");
sw.WriteLine();
sw.WriteLine(codesnippet);
sw.WriteLine(" }");
sw.WriteLine("}");
sw.Flush();
sw.Close();
// compile code snippet into assembly
parameters.OutputAssembly = script_assembly + ".dll";
CSharpCodeProvider provider = new CSharpCodeProvider();
provider.CompileAssemblyFromSource(parameters, sb.ToString());
// run snippet in its own AppDomain
AppDomainSetup setup = new AppDomainSetup();
setup.ApplicationBase = AppDomain.CurrentDomain.BaseDirectory;
appdomain = AppDomain.CreateDomain("Scripting", null, setup);
ObjectHandle handle = appdomain.CreateInstance("RemoteLoader", "RemoteLoader.RemoteLoaderFactory");
RemoteLoader.RemoteLoaderFactory factory = (RemoteLoader.RemoteLoaderFactory)handle.Unwrap();
RemoteLoader.IRemoteInterface objSnippet = factory.Create(script_assembly + ".dll", "CodeDomAssistant.Script.CodeSnippet", null);
results = objSnippet.Invoke(method, args);
}
finally
{
if (appdomain != null)
{
AppDomain.Unload(appdomain);
}
if (File.Exists(script_assembly + ".dll"))
{
File.Delete(script_assembly + ".dll");
}
}
return results;
}
}
}
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