.net - 逗号 "izing"项目列表

Question

给定一个字符串列表，将这些字符串连接成逗号分隔且末尾没有逗号的列表的最佳方法是什么。 (VB.NET 或 C#)(使用 StringBuilder 或 String Concat。)

Dim strResult As String = ""
Dim lstItems As New List(Of String)
lstItems.Add("Hello")
lstItems.Add("World")
For Each strItem As String In lstItems
    If strResult.Length > 0 Then
        strResult = strResult & ", "
    End If
    strResult = strResult & strItem
Next
MessageBox.Show(strResult)

Answer 1

Dim Result As String
Dim Items As New List(Of String)
Items.Add("Hello")
Items.Add("World")

Result = String.Join(",", Items)
MessageBox.Show(Result)

如果您真的担心空字符串，请使用此连接函数:

Function Join(ByVal delimiter As String, ByVal items As IEnumerable(Of String), Optional ByVal IgnoreEmptyEntries As Boolean = True) As String
    Dim delim As String = ""
    Dim result As New Text.StringBuilder("")

    For Each item As String In items
        If Not IgnoreEmptyEntries OrElse Not String.IsNullOrEmpty(item) Then
            result.Append(delim).Append(item)
            delim = delimiter
        End If
    Next
    Return result.ToString()
End Function

---

上面真的很老了。今天，我会像这样清除空字符串:

Dim Result As String = String.Join("," Items.Where(Function(i) Not String.IsNullOrWhitespace(i)))