Question

如何更正此匿名类型转换错误？

Cannot implicitly convert type 'System.Linq.IQueryable<AnonymousType#1>' to 'System.Linq.IQueryable<object>'

发生在线

select new { ITEMID = p.PRESSRELEASEID };

代码

ddlYear.DataSource = years;
                    ddlYear.DataBind();
                    ddlYear.Items.Insert(0, new ListItem("Year", ""));

                    IQueryable<object> pressreleases;
                    DateTime startdate, enddate;

                    if (this.iFilterMonth != null && this.iFilterMonth > 0 && this.iFilterYear != null)
                    {
                        startdate = new DateTime((int)this.iFilterYear, (int)this.iFilterMonth, 1);
                        enddate = startdate.AddMonths(1);

                        pressreleases = from p in db.tblPressReleases
                                        where p.prdate.Date >= startdate.Date && p.prdate.Date < enddate.Date
                                        orderby p.prdate descending
                                        select new { ITEMID = p.PRESSRELEASEID };
                    }

从建议的评论看起来像我在web.config中运行3.5？如果确实是我的错误的原因如何更改版本？

<add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                <add assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
                <add assembly="System.Data.DataSetExtensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                <add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                <add assembly="System.Data.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                <add assembly="System.Web.Routing, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
                <add assembly="System.Data.Entity, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                <add assembly="System.Data.Services, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                <add assembly="System.Data.Services.Client, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                <add assembly="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
                <add assembly="System.Web.Abstractions, Version=3.5.0.0,Culture=neutral,PublicKeyToken=31bf3856ad364e35" />

如何转换类型？存在显式转换错误

0 个答案: