LINQ to Entities无法识别方法＆＃39; Int32 ToInt32（System.String）＆＃39;方法。 MVC

Question

LINQ to Entities无法识别方法＆＃39; Int32 ToInt32（System.String）＆＃39;方法

System.Web.Security.MembershipUser mu = System.Web.Security.Membership.GetUser();

string ID = mu.ProviderUserKey.ToString();

if(db.resume.Where(x => x.employeeID ==Convert.ToInt32(ID)).Count() == 0)

Answer 1

如异常消息中所述，表达式中不支持Convert.ToInt32。只需将其移出表达式：

System.Web.Security.MembershipUser mu = System.Web.Security.Membership.GetUser();

string ID  = mu.ProviderUserKey.ToString();
int    IID = Convert.ToInt32(ID);

if( db.resume.Where(x => x.employeeID == IID).Count() == 0 )