ASP.NETMVC：没有为该对象定义的无参数构造函数？
Server Error in '/' Application.
--------------------------------------------------------------------------------
No parameterless constructor defined for this object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.MissingMethodException: No parameterless constructor defined for this object.
Source Error:
Line 16: HttpContext.Current.RewritePath(Request.ApplicationPath, false);
Line 17: IHttpHandler httpHandler = new MvcHttpHandler();
Line 18: httpHandler.ProcessRequest(HttpContext.Current);
Line 19: HttpContext.Current.RewritePath(originalPath, false);
Line 20: }无法再加载自己的项目
如果模型使用的是SelectList:
public class MyViewModel
{
public SelectList Contacts { get;set; }
}需要重构模型才能做到这一点。所以使用IEnumerable<Contact>并编写一个扩展方法：
public class MyViewModel
{
public Contact SelectedContact { get;set; }
public IEnumerable<Contact> Contacts { get;set; }
}
public static MvcHtmlString DropDownListForContacts(this HtmlHelper helper, IEnumerable<Contact> contacts, string name, Contact selectedContact)
{
// Create a List<SelectListItem>, populate it, return DropDownList(..)
}或者可以使用@Mark和@krilovich方法，将SelectList替换为IEnDigable
public class MyViewModel
{
public Contact SelectedContact { get;set; }
public IEnumerable<SelectListItem> Contacts { get;set; }
}为您推荐liwen223回答过的其他问题
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目前直播答题的热门平台有哪些？
提问于 2018-02-07
答liwen223
每次都各种抱大腿，小白一只。
8人回答了此问题
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