相关疑难解决方法(0)

我正在使用LINQ lambda表达式,如下所示:

int Value = 1;
qryContent objContentLine;

using (Entities db = new Entities())
{
    objContentLine = (from q in db.qryContents
                      where q.LineID == Value
                      orderby q.RowID descending
                      select q).FirstOrDefault();
}

但是,我收到以下错误:

无法将lambda表达式转换为类型'string',因为它不是委托类型

在对linq执行linq时如何选择所有行？

Select * From TableA

请在查询语法和方法语法中.

我在基于C#的代码中使用Entity Framework.我遇到了意想不到的怪异,正在寻找建议.

案例1,2,3,4 ......项目:
RivWorks.dll
RivWorks.Service.dll
RivWorks.Alpha.dll

样本(所有这些工作):
RivWorks.Alpha.dll:

public static bool EndNegotitation(long ProductID)
{
    var product = (from a in _dbFeed.AutoWithImage 
                   where a.AutoID == ProductID select a).FirstOrDefault();
...
}

RivWorks.Service.dll

public static RivWorks.Model.NegotiationAutos.AutoWithImage 
    GetProductById(long productId)
{
    var myProduct = from a in _dbFeed.AutoWithImage 
                    where a.AutoID == productId select a;

    return myProduct.FirstOrDefault();
}
public static List<RivWorks.Model.NegotiationAutos.AutoWithImage> 
    GetProductByCompany(Guid companyId)
{
    var myProduct = from a in _dbFeed.AutoWithImage 
                    where a.CompanyID == companyId select a;

    return myProduct.ToList();
}

等等

案例"怪异":
RivWorks.Web.Service.dll(WCF项目)
包含与其他项目相同的引用.

public …