c# - 带where条件的mvc 5 asp.net selectlist

Question

这是 Action Controller 中的选择列表，

ViewBag.UserName = new SelectList(db.Users.Where(g => g.UserName == User.Identity.GetUserName()), "UserName", "UserName");

我正在传递给 View :

 <div class="form-group">
            @Html.LabelFor(model => model.UserName, "UserName", htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.DropDownList("UserName", null, htmlAttributes: new { @class = "form-control" })
                @Html.ValidationMessageFor(model => model.UserName, "", new { @class = "text-danger" })
            </div>
        </div>

它不工作错误:

LINQ to Entities does not recognize the method 'System.String GetUserName(System.Security.Principal.IIdentity)' method, and this method cannot be translated into a store expression.

Answer 1

GetUserName 无法转换为表达式。试试这个

var username = User.Identity.GetUserName();
ViewBag.UserName = new SelectList(db.Users.Where(g => g.UserName == username), "UserName", "UserName");

也许像 Haitham 建议的那样添加 .ToList()。