集合的常用操作，去重、差集、交集、并集等

封装成Dll,使用此类必须有.net3.5的支持

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代码：就是System.Linq的简单封装

Public Class LinqEx

    \'\'\' <summary>
    \'\'\' 获取数组或集合的不重复值
    \'\'\' </summary>
    \'\'\' <typeparam name="TSource">输入序列中的元素的类型</typeparam>
    \'\'\' <param name="source">要从中移除重复元素的序列</param>
    \'\'\' <returns>一个 IEnumerable，包含源序列中的非重复元素</returns>
    \'\'\' <remarks></remarks>
    Public Shared Function Distinct(Of TSource)(ByVal source As IEnumerable(Of TSource)) As IEnumerable(Of TSource)
        Return source.Distinct()
    End Function

    \'\'\' <summary>
    \'\'\' 获取数组或集合的差集
    \'\'\' </summary>
    \'\'\' <typeparam name="TSource">输入序列中的元素的类型</typeparam>
    \'\'\' <param name="first">一个 IEnumerable，将返回其也不在 second 中的元素</param>
    \'\'\' <param name="second">一个 IEnumerable，如果它的元素也出现在第一个序列中，则将导致从返回的序列中移除这些元素</param>
    \'\'\' <returns>包含两个序列元素的差集的序列</returns>
    \'\'\' <remarks></remarks>
    Public Shared Function Except(Of TSource)(ByVal first As IEnumerable(Of TSource), ByVal second As IEnumerable(Of TSource)) As IEnumerable(Of TSource)
        Return first.Except(second)
    End Function

    \'\'\' <summary>
    \'\'\' 获取数组或集合的交集
    \'\'\' </summary>
    \'\'\' <typeparam name="TSource"></typeparam>
    \'\'\' <param name="first"></param>
    \'\'\' <param name="second"></param>
    \'\'\' <returns></returns>
    \'\'\' <remarks></remarks>
    Public Shared Function Intersect(Of TSource)(ByVal first As IEnumerable(Of TSource), ByVal second As IEnumerable(Of TSource)) As IEnumerable(Of TSource)
        Return first.Intersect(second)
    End Function

    \'\'\' <summary>
    \'\'\' 获取数组或集合的并集
    \'\'\' </summary>
    \'\'\' <typeparam name="TSource"></typeparam>
    \'\'\' <param name="first"></param>
    \'\'\' <param name="second"></param>
    \'\'\' <returns></returns>
    \'\'\' <remarks></remarks>
    Public Shared Function Union(Of TSource)(ByVal first As IEnumerable(Of TSource), ByVal second As IEnumerable(Of TSource)) As IEnumerable(Of TSource)
        Return first.Union(second)
    End Function

    \'\'\' <summary>
    \'\'\' 计算 Decimal 值序列之和
    \'\'\' </summary>
    \'\'\' <param name="source">一个要计算和的 Decimal 值序列</param>
    \'\'\' <returns>序列值之和</returns>
    \'\'\' <remarks></remarks>
    Public Shared Function Sum(ByVal source As IEnumerable(Of Decimal)) As Decimal
        Return source.Sum()
    End Function

    \'\'\' <summary>
    \'\'\' 计算 Double 值序列之和
    \'\'\' </summary>
    \'\'\' <param name="source">一个要计算和的 Double 值序列</param>
    \'\'\' <returns>序列值之和</returns>
    \'\'\' <remarks></remarks>
    Public Shared Function Sum(ByVal source As IEnumerable(Of Double)) As Double
        Return source.Sum()
    End Function

    \'\'\' <summary>
    \'\'\' 计算Integer值序列之和
    \'\'\' </summary>
    \'\'\' <param name="source">一个要计算和的Integer值序列</param>
    \'\'\' <returns>序列值之和</returns>
    \'\'\' <remarks></remarks>
    Public Shared Function Sum(ByVal source As IEnumerable(Of Integer)) As Integer
        Return source.Sum()
    End Function

    \'\'\' <summary>
    \'\'\' 计算 Long 值序列之和
    \'\'\' </summary>
    \'\'\' <param name="source">一个要计算和的 Long 值序列</param>
    \'\'\' <returns>序列值之和</returns>
    \'\'\' <remarks></remarks>
    Public Shared Function Sum(ByVal source As IEnumerable(Of Long)) As Long
        Return source.Sum()
    End Function

    \'\'\' <summary>
    \'\'\' 计算 Single 值序列之和
    \'\'\' </summary>
    \'\'\' <param name="source">一个要计算和的 Single 值序列</param>
    \'\'\' <returns>序列值之和</returns>
    \'\'\' <remarks></remarks>
    Public Shared Function Sum(ByVal source As IEnumerable(Of Single)) As Single
        Return source.Sum()
    End Function

    \'\'\' <summary>
    \'\'\' 返回泛型序列中的最大值
    \'\'\' </summary>
    \'\'\' <typeparam name="TSource"></typeparam>
    \'\'\' <param name="source"></param>
    \'\'\' <returns></returns>
    \'\'\' <remarks></remarks>
    Public Shared Function Max(Of TSource)(ByVal source As IEnumerable(Of TSource)) As TSource
        Return source.Max
    End Function

    \'\'\' <summary>
    \'\'\' 返回泛型序列中的最小值。
    \'\'\' </summary>
    \'\'\' <typeparam name="TSource">source 中的元素的类型。</typeparam>
    \'\'\' <param name="source">一个值序列，用于确定最小值</param>
    \'\'\' <returns>序列中的最小值</returns>
    \'\'\' <remarks></remarks>
    Public Shared Function Min(Of TSource)(ByVal source As IEnumerable(Of TSource)) As TSource
        Return source.Min
    End Function

End Class

示例：别忘了复制Dll

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