如何使用List（Of t）填充DataTable或将List（Of t）转换为DataTable？

Question

我已经阅读了很多关于这个主题的帖子;其中以及最近的 .NET - 将通用集合转换为数据表。不幸的是，一切都没有用。

我有一个通用的结构集合：

Private Structure MyStruct
Dim sState as String
Dim lValue as Long
Dim iLayer as Integer
End Structure

Dim LOStates As New List(Of MyStruct)

我需要使用此结构列表填充DataTable，但不知道如何执行此操作。我在Visual Studio 2008中使用vb.net。

非常感谢任何见解

Answer 1

您链接的代码假定成员被声明为属性。您没有声明属性。你可以使用Reflection：

Imports System.Reflection
...

      Public Shared Function ConvertToDataTable(Of T)(ByVal list As IList(Of T)) As DataTable
        Dim table As New DataTable()
        Dim fields() As FieldInfo = GetType(T).GetFields()
        For Each field As FieldInfo In fields
          table.Columns.Add(field.Name, field.FieldType)
        Next
        For Each item As T In list
          Dim row As DataRow = table.NewRow()
          For Each field As FieldInfo In fields
            row(field.Name) = field.GetValue(item)
          Next
          table.Rows.Add(row)
        Next
        Return table
      End Function

Answer 2

我遇到与@SamSelikoff相同的问题，转移到GetProperties：

Public Shared Function ConvertToDataTable(Of t)(
                                                  ByVal list As IList(Of t)
                                               ) As DataTable
    Dim table As New DataTable()
    If Not list.Any Then
        'don't know schema ....
        Return table
    End If
    Dim fields() = list.First.GetType.GetProperties
    For Each field In fields
        table.Columns.Add(field.Name, field.PropertyType)
    Next
    For Each item In list
        Dim row As DataRow = table.NewRow()
        For Each field In fields
            dim p = item.GetType.GetProperty(field.Name)
            row(field.Name) = p.GetValue(item, Nothing)
        Next
        table.Rows.Add(row)
    Next
    Return table
End Function