internal static object BuildType(Type type, ObtainParameterCallback obtainParameter)
{
if (type == null)
{
throw new ArgumentNullException(nameof(type));
}
if (obtainParameter == null)
{
throw new ArgumentNullException(nameof(obtainParameter));
}
if (type.IsInterface || type.IsAbstract)
{
throw new ArgumentException($"Unable to create an instance of the specified '{type.FullName}' type because it is an interface or an abstract class.");
}
ConstructorInfo[] constructors = type.GetConstructors();
foreach (ConstructorInfo constructor in constructors.OrderByDescending(ctor => ctor.GetParameters().Length))
{
ParameterInfo[] parameters = constructor.GetParameters();
if (parameters.Length == 0)
{
return(Activator.CreateInstance(type));
}
bool matched = false;
object[] values = new object[parameters.Length];
for (int i = 0; i < parameters.Length; i++)
{
//依次获取当前构造函数的参数值
matched = obtainParameter(parameters[i].ParameterType, parameters[i].Name, out values[i]);
//如果获取参数值失败，则当前构造函数匹配失败
if (!matched)
{
break;
}
}
if (matched)
{
return(Activator.CreateInstance(type, values));
}
}
return(null);
}
internal static object BuildType(Type type, ObtainParameterCallback obtainParameter)
{
if (type == null)
{
throw new ArgumentNullException("type");
}
if (obtainParameter == null)
{
throw new ArgumentNullException("obtainParameter");
}
ConstructorInfo[] constructors = type.GetConstructors();
foreach (ConstructorInfo constructor in constructors.OrderByDescending(ctor => ctor.GetParameters().Length))
{
ParameterInfo[] parameters = constructor.GetParameters();
if (parameters.Length == 0)
{
return(Activator.CreateInstance(type));
}
bool matched = false;
object[] values = new object[parameters.Length];
for (int i = 0; i < parameters.Length; i++)
{
//依次获取当前构造函数的参数值
matched = obtainParameter(parameters[i].ParameterType, parameters[i].Name, out values[i]);
//如果获取参数值失败，则当前构造函数匹配失败
if (!matched)
{
break;
}
}
if (matched)
{
return(Activator.CreateInstance(type, values));
}
}
return(null);
}