public Action <IApplicationBuilder> LoadStartup(
string applicationName,
string environmentName,
IList <string> diagnosticMessages)
{
if (String.IsNullOrEmpty(applicationName))
{
return(_next.LoadStartup(applicationName, environmentName, diagnosticMessages));
}
var assembly = Assembly.Load(new AssemblyName(applicationName));
if (assembly == null)
{
throw new Exception(String.Format("TODO: assembly {0} failed to load message", applicationName));
}
var startupName1 = "Startup" + environmentName;
var startupName2 = "Startup";
// Check the most likely places first
var type =
assembly.GetType(startupName1) ??
assembly.GetType(applicationName + "." + startupName1) ??
assembly.GetType(startupName2) ??
assembly.GetType(applicationName + "." + startupName2);
if (type == null)
{
// Full scan
var definedTypes = assembly.DefinedTypes.ToList();
var startupType1 = definedTypes.Where(info => info.Name.Equals(startupName1, StringComparison.Ordinal));
var startupType2 = definedTypes.Where(info => info.Name.Equals(startupName2, StringComparison.Ordinal));
var typeInfo = startupType1.Concat(startupType2).FirstOrDefault();
if (typeInfo != null)
{
type = typeInfo.AsType();
}
}
if (type == null)
{
throw new Exception(String.Format("TODO: {0} or {1} class not found in assembly {2}",
startupName1,
startupName2,
applicationName));
}
var configureMethod = FindMethod(type, "Configure{0}", environmentName, typeof(void), required: true);
var servicesMethod = FindMethod(type, "Configure{0}Services", environmentName, typeof(IServiceProvider), required: false)
?? FindMethod(type, "Configure{0}Services", environmentName, typeof(void), required: false);
object instance = null;
if (!configureMethod.IsStatic || (servicesMethod != null && !servicesMethod.IsStatic))
{
instance = ActivatorUtilities.GetServiceOrCreateInstance(_services, type);
}
return(builder =>
{
if (servicesMethod != null)
{
var services = HostingServices.Create(builder.ApplicationServices);
// TODO: remove this once IHttpContextAccessor service is added
services.AddContextAccessor();
if (servicesMethod.ReturnType == typeof(IServiceProvider))
{
// IServiceProvider ConfigureServices(IServiceCollection)
builder.ApplicationServices = (Invoke(servicesMethod, instance, builder, services) as IServiceProvider)
?? builder.ApplicationServices;
}
else
{
// void ConfigureServices(IServiceCollection)
Invoke(servicesMethod, instance, builder, services);
if (builder != null)
{
builder.ApplicationServices = services.BuildServiceProvider();
}
}
}
Invoke(configureMethod, instance, builder);
});
}
public Action<IBuilder> LoadStartup(
string applicationName,
string environmentName,
IList<string> diagnosticMessages)
{
if (String.IsNullOrEmpty(applicationName))
{
return _next.LoadStartup(applicationName, environmentName, diagnosticMessages);
}
var assembly = Assembly.Load(new AssemblyName(applicationName));
if (assembly == null)
{
throw new Exception(String.Format("TODO: assembly {0} failed to load message", applicationName));
}
var startupName1 = "Startup" + environmentName;
var startupName2 = "Startup";
// Check the most likely places first
var type =
assembly.GetType(startupName1) ??
assembly.GetType(applicationName + "." + startupName1) ??
assembly.GetType(startupName2) ??
assembly.GetType(applicationName + "." + startupName2);
if (type == null)
{
// Full scan
var definedTypes = assembly.DefinedTypes.ToList();
var startupType1 = definedTypes.Where(info => info.Name.Equals(startupName1, StringComparison.Ordinal));
var startupType2 = definedTypes.Where(info => info.Name.Equals(startupName2, StringComparison.Ordinal));
var typeInfo = startupType1.Concat(startupType2).FirstOrDefault();
if (typeInfo != null)
{
type = typeInfo.AsType();
}
}
if (type == null)
{
throw new Exception(String.Format("TODO: {0} or {1} class not found in assembly {2}",
startupName1,
startupName2,
applicationName));
}
var configureMethod1 = "Configure" + environmentName;
var configureMethod2 = "Configure";
var methodInfo = type.GetTypeInfo().GetDeclaredMethod(configureMethod1);
if (methodInfo == null)
{
methodInfo = type.GetTypeInfo().GetDeclaredMethod(configureMethod2);
}
if (methodInfo == null)
{
throw new Exception(string.Format("TODO: {0} or {1} method not found",
configureMethod1,
configureMethod2));
}
if (methodInfo.ReturnType != typeof(void))
{
throw new Exception(string.Format("TODO: {0} method isn't void-returning.",
methodInfo.Name));
}
object instance = null;
if (!methodInfo.IsStatic)
{
instance = ActivatorUtilities.GetServiceOrCreateInstance(_services, type);
}
return builder =>
{
var parameterInfos = methodInfo.GetParameters();
var parameters = new object[parameterInfos.Length];
for (var index = 0; index != parameterInfos.Length; ++index)
{
var parameterInfo = parameterInfos[index];
if (parameterInfo.ParameterType == typeof(IBuilder))
{
parameters[index] = builder;
}
else
{
try
{
parameters[index] = _services.GetService(parameterInfo.ParameterType);
}
catch (Exception ex)
{
throw new Exception(string.Format(
"TODO: Unable to resolve service for startup method {0} {1}",
parameterInfo.Name,
parameterInfo.ParameterType.FullName));
}
}
}
methodInfo.Invoke(instance, parameters);
};
}