小编use*_*738的帖子

尝试将属性值检索为对象而不是各自的类型时,我遇到了一些麻烦.以下代码抛出此异常:

Unable to cast the type 'System.DateTime' to type 'System.Object'. LINQ to Entities only supports casting EDM primitive or enumeration types.

选择字符串时此代码可以正常工作,但选择DateTimes,Integers或Nullable类型时则不行.

public class Customer
{
    public int Id { get; set; }

    public string Name { get; set; }

    public DateTime CreatedOn { get; set; }
}

public class Program
{
    public static void Main(string[] args)
    {
        using (var ctx = new MyContext())
        {
            // Property selector: select DateTime as Object
            Expression<Func<Customer, object>> selector = cust => cust.CreatedOn;

            // …