/// <summary>
/// In the constructor sets the host instance into a static object.
/// </summary>
/// <param name="host">The host to set as current.</param>
public void SetCurrentHost(TemplateHost host)
{
if (host == null)
{
throw new ArgumentNullException("host");
}
TemplateHost.CurrentHost = host;
}
/// <summary>
/// Initialize the host.
/// </summary>
/// <param name="host"></param>
public override void Initialize(ITextTemplatingEngineHost host)
{
base.Initialize(host);
if (host == null)
{
throw new ArgumentNullException("host");
}
this.host = (TemplateHost)host;
}
/// <summary>
/// Invokes the T4 rendering engine
/// </summary>
/// <param name="templateCode">The T4 template to render</param>
/// <param name="templateFile">The file containing the template code</param>
/// <returns>The rendered result</returns>
protected string Render(string templateCode, string templateFile)
{
// Get the package root folder.
string basePath = GetBasePath();
// Create the Engine
ITextTemplatingEngine engine = new Engine();
// Build arguments.
IValueInfoService mdService = (IValueInfoService)GetService(typeof(IValueInfoService));
Dictionary <string, PropertyData> args = new Dictionary <string, PropertyData>();
foreach (string key in additionalArguments.Keys)
{
Type type = null;
try
{
type = mdService.GetInfo(key).Type;
}
catch (ArgumentException)
{
// Type is not defined in recipe, so take it from the argument value itself.
// This is useful for values passed-in as configuration attributes.
if (additionalArguments[key] != null)
{
type = additionalArguments[key].GetType();
}
else
{
// Can't determine type, so we can't emit a property.
continue;
}
}
PropertyData propertyData = new PropertyData(additionalArguments[key], type);
args.Add(key, propertyData);
}
// Create the Host. References will be resolved relative to the guidance
// package installation folder.
TemplateHost host = new TemplateHost(basePath, args);
host.TemplateFile = templateFile;
// Set the output
string content = engine.ProcessTemplate(templateCode, host);
// Looking for errors
if (host.Errors.HasErrors)
{
throw new TemplateException(host.Errors);
}
else if (host.Errors.HasWarnings)
{
StringBuilder warnings = new StringBuilder();
foreach (CompilerError warning in host.Errors)
{
warnings.AppendLine(warning.ToString());
}
Trace.WriteLine(String.Format(
CultureInfo.CurrentCulture,
Properties.Resources.T4Action_CompilationWarnings,
templateFile,
warnings.ToString()));
}
return(content);
}
/// <summary>
/// Causes the current host on the current AppDomain to be set to
/// the received one for static access from the template.
/// </summary>
public TemplateHostInitializer(TemplateHost host)
{
this.SetCurrentHost(host);
}