我有以下函数从字符串类型的控制器名称返回操作名称的选择列表:
public ActionResult get_all_action(string controllername)
{
Type t = Type.GetType(controllername);
MethodInfo[] mi = t.GetMethods();
List<SelectListItem> action = new List<SelectListItem>();
foreach (MethodInfo m in mi)
{
if (m.IsPublic)
if (typeof(ActionResult).IsAssignableFrom(m.ReturnParameter.ParameterType))
{
action.Add(new SelectListItem() { Value = m.Name, Text = m.Name });
}
}
var List = new SelectList(action, "Value", "Text");
return Json(List, JsonRequestBehavior.AllowGet);
}
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get_all_action()的参数controllername被传递为例如"AccountController".但抛出异常
MethodInfo[] mi = t.GetMethods();
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如:
Object reference not set to an instance of an object.
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"AccountController"不是完整的类型名称; 它需要像"YourApp.Whatever.AccountController"为GetType()找到它.它也值得明确它所在的汇编,例如:
var thisType = GetType();
Type t = thisType.Assembly.GetType(
thisType.Namespace + "." + controllerName);
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(假设我们的意思是相同的程序集/命名空间)