我对MVC还比较陌生。当我尝试提交一个包含静态DropDownListFor的表单时,出现以下异常:
The ViewData item that has the key 'CurrentPosition' is of type 'System.String' but must be of type 'IEnumerable<SelectListItem>'.
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.InvalidOperationException: The ViewData item that has the key 'CurrentPosition' is of type 'System.String' but must be of type 'IEnumerable<SelectListItem>'.
Source Error:
Line 36: @Html.LabelFor(m => m.CurrentPosition, new { @class = "col-md-2 control-label" })
Line 37: <div class="col-md-10">
Line 38: @Html.DropDownListFor(m => m.CurrentPosition, ViewData["Positions"] as SelectList)
Line 39: @Html.ValidationMessageFor(m => m.CurrentPosition, "", new { @class = "text-danger" })
Line 40: </div>
模型:
[Display(Name = "Current Position")]
[Required(ErrorMessage = "Please select their current position")]
public string CurrentPosition { get; set; }
查看:
<div class="form-group">
@Html.LabelFor(m => m.CurrentPosition, new { @class = "col-md-2 control-label" })
<div class="col-md-10">
@Html.DropDownListFor(m => m.CurrentPosition, ViewData["Positions"] as SelectList)
@Html.ValidationMessageFor(m => m.CurrentPosition, "", new { @class = "text-danger" })
</div>
</div>
控制器:
[HttpGet]
public ActionResult Sales()
{
var positions = new SelectList(new []
{
new { value = 0, text = "Select a Position..." },
new { value = 1, text = "Merchandiser" },
new { value = 2, text = "ISR" },
new { value = 3, text = "TM" },
new { value = 4, text = "AISR" },
new { value = 5, text = "TAM" },
new { value = 6, text = "BAM" },
new { value = 7, text = "CSR" },
new { value = 8, text = "Director" },
new { value = 9, text = "TSM" },
new { value = 10, text = "Tel-Sell" },
new { value = 11, text = "Graphics" },
new { value = 12, text = "Shelf Set" },
new { value = 13, text = "Secretary" },
new { value = 14, text = "POS" },
new { value = 15, text = "Other" }
},
"value", "text", 1);
ViewData["Positions"] = positions;
return View();
}
我已经尝试了几种不同的方法,似乎只有在视图中直接静态填充列表项才能使其正常工作,但我认为这并不正确,因为我将在此视图中再次使用此列表。你觉得呢?
编辑:发布操作。现在为空。
[HttpPost]
public ActionResult Sales(SalesViewModel model)
{
return View(model);
}