数据表列在Vb.Net

Question

字符串数组我与数据表列的工作，我希望获取数据表到字符串数组的一列，然后要分配给AutoCompleteStringCollection对象。目前我使用循环填充“AutoCompleteStringCollection”，但如果我有500行以上，则需要时间。我想用out循环来做到这一点。任何机构都可以建议更好的方法。

Dim autocomp As New AutoCompleteStringCollection 
     For index As Integer = 0 To unionTable.Rows.Count - 1 
      autocomp.Add(unionTable.Rows(index)(1).ToString()) 
     Next 

我想要做的不循环，帮助请

有点挣扎，我设法做this.with的.Net 3.5框架

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click 
    Try 
     Dim table1 As DataTable = New DataTable("Test") 
     table1.Columns.Add("name") 
     table1.Columns.Add("id") 
     table1.Rows.Add("Abb", 1) 
     table1.Rows.Add("Killers", 2) 

     Dim allAutoCompletes = From row In table1.AsEnumerable() 
         Let autoComplete = row.Field(Of String)(0) 
         Select autoComplete 
     Dim autoCompleteString As String() = allAutoCompletes.ToArray() 
     Dim x As String = "" 
     Dim autocomp As New AutoCompleteStringCollection 
     autocomp.AddRange(autoCompleteString) 
    Catch ex As Exception 
     MessageBox.Show(ex.Message) 
    End Try 

Answer 1

你总是要使用一个循环之后。但是你可以使用LINQ它看起来更好：

Dim allAutoCompletes = From row In unionTable.AsEnumerable() 
         Let autoComplete = row.Field(Of String)(1) 
         Select autoComplete 
Dim autoCompleteStringCollection As String() = allAutoCompletes.ToArray() 

如果你想有一个List(Of String)使用ToList。

下面是与上述相同的方法的语法，用什么你找到更具可读性：

Dim autoCompleteStringCollection As String() = unionTable.AsEnumerable(). 
    Select(Function(r) r.Field(Of String)(1)). 
    ToArray()