c# 开发常用小方法

1. 判断两个列表是否为子集关系

private bool IsSubSet(List<string> origList, List<string> curList)
{
     return curList.All(o => origList.Any(t => t == o));
}

2. 比较两个list内容是否相同

 http://www.luofenming.com/show.aspx?id=ART2018042800001

public bool CompareList(List<string> list1, List<string> list2){
    bool result = false;
    var except1 = list1.Except(list2).ToList();
    var except2 = list2.Except(list1).ToList();
    if (list1.Count == list2.Count && except1.Count == 0 && except2.Count == 0)
    {
        result = true;
    }
    return result;
}

3. c#反射获取所有类的属性及属性值并存入字典中

以下方法在发送http请求参数的场景中，经常用到

private Dictionary<string, string> GetPropertyAndValue1<T>(T dto)
{
    var paramsDic = new Dictionary<string, string>();
    var propertyArray = dto.GetType().GetProperties();
    foreach (var property in propertyArray)
    {
        var key = property.Name.ToLower();
        if (property.GetValue(dto) != null)
        {
            paramsDic.Add(key, property.GetValue(dto).ToString());
        }
    }

    return paramsDic;
}

4 获取当前时间为本年度第几周

/// <summary>
/// 获取当前时间第几周
/// </summary>
/// <param name="dateTime"></param>
/// <returns></returns>
public static int GetWeekIndex(DateTime dateTime)
{
    int firstWeekend = Convert.ToInt32(DateTime.Parse(dateTime.Year + "-1-1").DayOfWeek);
    int span = firstWeekend == 0 ? 1 : (7 - firstWeekend + 1);
    int currentDay = dateTime.DayOfYear;
    int current_week = Convert.ToInt32(Math.Ceiling((currentDay - span) / 7.0)) + 1;
    return current_week;
}