我想将通用列表存储在ASP.NET用户控件的viewstate中,所以我有以下代码:
protected List<MoodleCourse> MoodleCoursesCreated
{
get
{
if (ViewState["MoodleCoursesCreated"] == null)
{
return new List<MoodleCourse>();
}
else
{
return (List<MoodleCourse>)ViewState["MoodleCoursesCreated"];
}
}
set
{
ViewState["MoodleCoursesCreated"] = value;
}
}
因此,要将项目添加到列表中,我呼叫
MoodleCoursesCreated.Add(new MoodleCourse);
但是似乎我必须做
MoodleCourseCreated = MoodleCourseCreated
来激活设置器,以便列表实际上存储在viewstate中。我怀疑有一个更优雅的方法可以实现这一目标,有人对此有何建议?干杯 最佳答案
调用.Add()永远不会触发设置器。我想,您根本不需要二传手。相反,重写Add()方法或创建自己的AddMoodleCourse(MoodleCourse moodleCourse):
protected void AddMoodleCourse(MoodleCourse moodleCourse)
{
var courses = ViewState["MoodleCoursesCreated"] as List<MoodleCourse>;
if (courses == null)
{
courses = new List<MoodleCourse>();
ViewState["MoodleCoursesCreated"] = courses;
}
courses.Add(moodleCourse);
}
现在调用MoodleCoursesCreated.AddMoodleCourse(new MoodleCourse);