private void ValidateRunOptions(RunOptions opts)
{
if (opts.GetNamespace() == null || opts.GetNamespace().Length == 0)
{
throw new RunError("The namespace must not be blank");
}
if (opts.GetClass() == null || opts.GetClass().Length == 0)
{
throw new RunError("The class must not be blank");
}
if (opts.GetMethod() == null || opts.GetMethod().Length == 0)
{
throw new RunError("The method must not be blank");
}
}
/// <summary>
/// Runs a method in the compiled code based on the given options. If the code does not compile,
/// it throws an exception. If the method cannot be run or is not found, it throws an exception.
/// </summary>
/// <param name="opts">The configuration based on which the method is run.</param>
/// <returns>The result of invoking the method. If the method is void, the result is set to null.</returns>
public object Run(RunOptions opts)
{
ValidateRunOptions(opts);
using (var compileStream = new MemoryStream())
{
EmitResult result = cSharpCompilation.Emit(compileStream);
if (!result.Success)
{
throw CompilationError.Build(GetErrors());
}
compileStream.Seek(0, SeekOrigin.Begin);
Assembly assembly = AssemblyLoadContext.Default.LoadFromStream(compileStream);
string namespaceAndClass = $"{opts.GetNamespace()}.{opts.GetClass()}";
var type = assembly.GetType(namespaceAndClass);
if (type == null)
{
throw new RunError(
$"Could not find class '{opts.GetClass()}' in namespace '{opts.GetNamespace()}'");
}
var members = type.GetMember(opts.GetMethod());
if (members == null || members.Count() == 0)
{
throw new RunError(
$"Could not find method '{opts.GetMethod()}' in class '{opts.GetClass()}' and namespace '{opts.GetNamespace()}'");
}
var member = members.First() as MethodInfo;
if (member == null)
{
throw new RunError(
$"Could not find method '{opts.GetMethod()}' in class '{opts.GetClass()}' and namespace '{opts.GetNamespace()}'");
}
var instance = assembly.CreateInstance(namespaceAndClass);
return(member.Invoke(instance, opts.GetArgs()));
}
}