// helper method : 按照 DirectorAttribute 的要求，执行相关的 Builder 方法
private void InvokeBuildPartMethod(
IAttributedBuilder builder, DirectorAttribute attribute)
{
switch (attribute.Method)
{
case "BuildPartA": builder.BuildPartA(); break;
case "BuildPartB": builder.BuildPartB(); break;
case "BuildPartC": builder.BuildPartC(); break;
}
}
public void BuildUp(IAttributedBuilder builder)
{
// 获取 Builder 的 DirectorAttribute 属性
object[] attributes =
builder.GetType().GetCustomAttributes(typeof(DirectorAttribute), false);
if (attributes.Length <= 0)
{
return;
}
DirectorAttribute[] directors = new DirectorAttribute[attributes.Length];
for (int i = 0; i < attributes.Length; i++)
{
directors[i] = (DirectorAttribute)attributes[i];
}
// 按每个 DirectorAttribute 优先级逆序排序后，逐个执行
Array.Sort <DirectorAttribute>(directors);
foreach (DirectorAttribute attribute in directors)
{
InvokeBuildPartMethod(builder, attribute);
}
}