1.多参数
判断 条件
//判断
var fileKey = new
{
DateStart = search.DateStart.IsNull(), //关开始时间
DateEnd = search.DateEnd.IsNull(), //结束时间
UserName = search.UserName.IsNullOrEmpty(), //用户名
NickName = search.NickName.IsNullOrEmpty(), //昵称
PhoneNumber = search.PhoneNumber.IsNullOrEmpty(), //电话号码
ProblemCatey = search.ProblemCatey.IsNullOrEmpty(), //问题种类
};
IsNull() 和 IsNullOrEmpry() 是扩展静态方法：
/// <summary>
/// 验证字符串是否为空字符串
/// </summary>
/// <param name="self"></param>
/// <returns></returns>
public static bool IsNullOrEmpty(this string self)
{
if (self == null || self.Length == 0)
{
return true;
}
return false;
}
使用如下
//查询
var list =
from p in
unitOfWork.FeedBack.Get(p => (fileKey.ProblemCatey || p.ProblemCatey.Contains(search.ProblemCatey)))
join m in unitOfWork.Member.Get() on p.UserID equals m.Id where fileKey.UserName || m.UserName.Contains(search.UserName)
where fileKey.NickName || m.NickName.Contains(search.NickName)
where fileKey.PhoneNumber || m.PhoneNumber.Contains(search.PhoneNumber) where fileKey.DateStart || p.CreatedOn >= search.DateStart
where fileKey.DateEnd || p.CreatedOn <= search.DateEnd select new FeedBackModelExd
{
Id = p.Id,
ProblemCatey = p.ProblemCatey,
CreatedOn = p.CreatedOn,
UserName = m.UserName,
NickName = m.NickName,
PhoneNumber = m.PhoneNumber,
Content = p.Content,
};
2.单一参数
改造前
private static bool TraditionalVerify(int number)
{
if ((number > 0) && (number >= 10) && (number % 2 > 0) && (number * 2 > 100))
{
return true;
}
return false;
}
改造后：
private static bool UseFunc(int number)
{
var conditionlist = new List<Func<bool>>()
{
() => number > 0,
() => number >= 10,
() => number % 2 > 0,
() => number * 2 > 100
}; return conditionlist.TrueForAll(foo => foo.Invoke());
}