方式1sql

//后台控制器验证
if (ModelState.IsValid == false)//后台控制器模型验证，false表示未通过
{
    return Json("-1");
}
FHZMEntities fHZMEntities = new FHZMEntities();
//fHZMEntities.UserInfo.Add(userInfo);
//参数化列表
List<SqlParameter> sqlParameterList = new List<SqlParameter>() { 
    new SqlParameter("@UserName",userInfo.UserName),
    new SqlParameter("@Number",userInfo.Number),
    new SqlParameter("@UClass",userInfo.UClass),
    new SqlParameter("@Ustate",userInfo.Ustate),
    new SqlParameter("@Id",userInfo.Id),
};
int count = fHZMEntities.Database.ExecuteSqlCommand("insert UserInfo values(@UserName,@Number,@UClass,@Ustate)", sqlParameterList.ToArray());
return Json(count);

方式2直接add

FHZMEntities fHZMEntities = new FHZMEntities();
fHZMEntities.UserInfo.Add(userInfo);
int count = fHZMEntities.SaveChanges();
return Json(count);

方式3，标准流程，添加状态

FHZMEntities fHZMEntities = new FHZMEntities();
fHZMEntities.Entry(userInfo).State = System.Data.EntityState.Added;
int count = fHZMEntities.SaveChanges();
return Json(count);