当允许多个选择时，参数'expression'必须计算为不可数。 [英] The parameter 'expression' must evaluate to an ienumerable when multiple selection is allowed.

问题描述

当我点击编辑链接后在编辑视图中加载列表框时我得到了例外

参数'表达式'必须评估为IEnumerable当允许多个选择时

Hi,
When I am loading the listbox in edit view after clicking edit link I am getting the exception
" The parameter 'expression' must evaluate to an IEnumerable when multiple selection is allowed"

<%: Html.ListBoxFor(model => model.PCBECSId,
 new MultiSelectList(ViewData["Selpcba"] as IEnumerable,
 "PCBAId", "ECSPCBAId", ViewData["pcbaDDindex"] as IEnumerable),
 new { id = "Pcbalstbox" })%>

请帮忙解决这个问题。



什么我试过了：



我正在编写代码来绑定列表框以进行多选，因为上面提到的代码在MVC2中工作而不在MVC4

Please help on this to overcome.

What I have tried:

I am writing the code to bind the list box for multi selection as the above mentioned code is working in MVC2 and not working in MVC4

推荐答案

您好，



请参阅以下SO链接。这些讨论肯定会有所帮助。

jquery - ListBoxFor在asp.net mvc中进行单一选择 [ ^ ]



c＃ - 在MVC4中绑定ListBoxFor控件时获取错误 [ ^ ]



第二个链接解释得更好。 :)

谢谢

Hello,

Please see the following SO links. These discussions will surely help.
jquery - ListBoxFor with single selection in asp.net mvc[^]

c# - Getting error at time of binding ListBoxFor control in MVC4[^]

Second link explains better. :)
Thanks

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