/// <summary>
/// 打乱序列列表的元素顺序
/// </summary>
/// <typeparam name="T">数组类型</typeparam>
/// <param name="slist">数据源序列</param>
/// <param name="need_num">需要的结果数量 如小于等于零取值序列个数</param>
/// <returns>结果序列</returns>
public static T[] Sample <T>(IList <T> slist, int need_num = 0)
{
if (CheckData.IsSizeEmpty(slist))
{
return(new T[] { });
}
List <T> rlist = new List <T>();
int slen_size = slist.Count;
if (need_num <= 0)
{
need_num = slen_size;
}
if (need_num > slen_size)
{
rlist.AddRange(Sample(slist, need_num - slen_size));
need_num = slen_size;
}
while (need_num > 0)
{
int index = GetInt(0, need_num);
need_num -= 1;
rlist.Add(slist[index]);
T C = slist[index];
slist[index] = slist[need_num];
slist[need_num] = C;
}
return(rlist.ToArray());
}
/// <summary>
/// 随机选取其中一个选项
/// </summary>
/// <typeparam name="T">数据类型</typeparam>
/// <param name="source">数据源</param>
/// <returns>结果选项, 数据源为空返回:数据类型默认值</returns>
public static T Item <T>(IList <T> source)
{
if (CheckData.IsSizeEmpty(source))
{
return(default(T));
}
return(source[R.Next(0, source.Count)]);
}
/// <summary>
/// 检查模型可以使用 多例
/// </summary>
/// <typeparam name="M">数据模型类型</typeparam>
/// <param name="array">数据来源</param>
/// <param name="errorMethod">不能使用的判断条件</param>
/// <returns>True: 可以使用, 反之亦然</returns>
public static bool IsCanUse <M>(M[] array, Func <M, bool> errorMethod) where M : AbsBasicDataModel
{
if (!CheckData.IsSizeEmpty(array))
{
foreach (M item in array)
{
if (IsCanUse(item, errorMethod))
{
return(true);
}
}
}
return(false);
}
/// <summary>
/// 拼接随机字符串
/// </summary>
/// <param name="source">指定字符进行拼接</param>
/// <param name="max_charlength">指定字符个数</param>
/// <returns>拼接结果</returns>
public static string GetString(char[] source, int sum_length)
{
if (CheckData.IsSizeEmpty(source))
{
return(string.Empty);
}
StringBuilder strbu = new StringBuilder();
for (int i = 0; i < sum_length; i++)
{
strbu.Append(Item(source));
}
return(strbu.ToString());
}
/// <summary>
/// 过滤禁用的字符
/// </summary>
/// <param name="source">需要处理的字符串</param>
/// <param name="disable_chars">禁用字符列表</param>
/// <returns>结果</returns>
public static string FilterDisableChars(string source, char[] disable_chars)
{
if (CheckData.IsStringNull(source))
{
return(string.Empty);
}
if (CheckData.IsSizeEmpty(disable_chars))
{
return(source);
}
foreach (char c in disable_chars)
{
source = source.Replace(c.ToString(), "");
}
return(source);
}
/// <summary>
/// 所有子文件夹递归循环获取
/// </summary>
/// <param name="olddir"></param>
/// <returns></returns>
public static DirectoryInfo[] AllSonDirectorys(DirectoryInfo olddir)
{
if (CheckData.IsObjectNull(olddir))
{
return(new DirectoryInfo[] { });
}
DirectoryInfo[] selfson = olddir.GetDirectories();
if (CheckData.IsSizeEmpty(selfson))
{
return(new DirectoryInfo[] { });
}
List <DirectoryInfo> sons = new List <DirectoryInfo>(selfson);
foreach (DirectoryInfo item in selfson)
{
sons.AddRange(AllSonDirectorys(item));
}
return(sons.ToArray());
}
/// <summary>
/// 获取指定范围选项, 长度计算方式: 加法计算: index + length
/// </summary>
/// <typeparam name="T">数据类型</typeparam>
/// <param name="source">数据源</param>
/// <param name="index">页面索引</param>
/// <param name="length">列表长度</param>
/// <returns>选项结果</returns>
public static T[] ToRangeIndex <T>(IList <T> source, int index, int length)
{
if (CheckData.IsSizeEmpty(source) || index >= source.Count)
{
return(new T[] { });
}
if (index < 0)
{
index = 0;
}
if (length < 0)
{
length = 0;
}
int sumlen = index + length;
if (sumlen >= source.Count)
{
length -= sumlen - source.Count;
}
List <T> list = new List <T>(source);
return(list.GetRange(index, length).ToArray());
}
/// <summary>
/// 查找指定的 Attribute '特性' 内容对象
/// </summary>
/// <typeparam name="A">指定的 Attribute '特性'</typeparam>
/// <param name="memberInfo">元数据</param>
/// <param name="isFindInherit">是否查找继承链, 默认不查找</param>
/// <returns>返回指定'特性'类型的第一个结果</returns>
public static A AttributeFindOnly <A>(MemberInfo memberInfo, bool isFindInherit = false) where A : System.Attribute
{
A[] attrs = AttributeFindALL <A>(memberInfo, isFindInherit);
return(CheckData.IsSizeEmpty(attrs) ? null : attrs[0]);
}