entity framework查询生成的语句，为什么没有参数化？

[dream__life]

[Table("Sys_User", Schema = "dbo")]
    public class User
    {
        [Key]
        public int ID { get; set; }

        [Display(Name = "账号")]
        [StringLength(20)]
        [Required]
        public string Account { get; set; }

        [Display(Name = "姓名")]
        [StringLength(20)]
        [Required]
        public string Name { get; set; }

        [Display(Name = "所属部门")]
        public int? DeptID { get; set; }

        [Display(Name = "性别")]
        [StringLength(10)]
        [Required]
        public string Sex { get; set; }

        [Display(Name = "密码")]
        [StringLength(50)]
        [Required]
        public string Password { get; set; }

        [Display(Name = "邮箱")]
        [StringLength(50)]
        public string Email { get; set; }

        [Display(Name = "是否启用")]
        [Required]
        public bool Enabled { get; set; }

        [Display(Name = "工作电话")]
        [StringLength(50)]
        public string OfficePhone { get; set; }

        [Display(Name = "手机号")]
        [StringLength(50)]
        public string CellPhone { get; set; }

        [Display(Name = "备注")]
        [StringLength(100)]
        public string Remark { get; set; }

        [Display(Name = "上次登录时间")]
        public DateTime? LastLoginTime { get; set; }
        [Display(Name = "创建时间")]
        public DateTime? CreateTime { get; set; }

    }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.Entity;
using System.Data.Entity.ModelConfiguration.Conventions;
namespace WebApplication1.Models
{
    public class EFContext : DbContext
    {
        public EFContext() : base("Default")
        {
            
        }

        public DbSet<User> Users { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            // 禁用默认表名复数形式
            modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();

            base.OnModelCreating(modelBuilder);

            
        }
    }
}

使用查询：

EFContext db = new EFContext();
Models.User u = db.Users.Where(p => p.Account == "admin").FirstOrDefault();

通过监听生成的SQL语句：

SELECT TOP (1) 
    [Extent1].[ID] AS [ID], 
    [Extent1].[Account] AS [Account], 
    [Extent1].[Name] AS [Name], 
    [Extent1].[DeptID] AS [DeptID], 
    [Extent1].[Sex] AS [Sex], 
    [Extent1].[Password] AS [Password], 
    [Extent1].[Email] AS [Email], 
    [Extent1].[Enabled] AS [Enabled], 
    [Extent1].[OfficePhone] AS [OfficePhone], 
    [Extent1].[CellPhone] AS [CellPhone], 
    [Extent1].[Remark] AS [Remark], 
    [Extent1].[LastLoginTime] AS [LastLoginTime], 
    [Extent1].[CreateTime] AS [CreateTime]
    FROM [dbo].[Sys_User] AS [Extent1]
    WHERE N'admin' = [Extent1].[Account]

为什么没有使用参数化查询条件呢，应该怎么配置，求教。