Question

我有一些DataTables我要导出到xml文件。我可以使用DataTable.WriteXml()将DataTables的内容输出到XML。

我需要使用Response object，如图所示。我需要将属性添加到输出xml的根目录。请帮帮我。这是我正在处理的代码。

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    Dim FileName1 As String = "Sheet1.xml"
    Response.Clear()
    Response.AddHeader("Content-Disposition", "attachment; filename=" & FileName1)
    Response.ContentType = "text/xml"
    Dim ds As New DataSet("BuildingGroups")
    ds.EnforceConstraints = False
    Dim dtBuildingGroup As DataTable = Pipeline.Products.Components.BuildingGroupManager.GetBuildingGroupsToXML
    Dim result As String
    Dim sw As New StringWriter()
    dtBuildingGroup.TableName = "BuildingGroup"
    ds.Tables.Add(dtBuildingGroup)
    'Dim doc As New XmlDataDocument(ds)
    ds.WriteXml(sw)
    result = sw.ToString()
    Response.Write(result)
    Response.End()
End Sub

Answer 1

您需要从string获取XML才能在Response.Write(result)中使用它，以下是一些方法：

假设一个小DataSet像这样创建：

Dim dt As New DataTable 
dt.Columns.Add(New DataColumn("Column1"))
dt.Columns.Add(New DataColumn("Column2"))
Dim r = dt.NewRow
r.Item(0) = "Value1"
r.Item(1) = "Value2"
dt.Rows.Add(r)
r = dt.NewRow
r.Item(0) = "Value3"
r.Item(1) = "Value4"
dt.Rows.Add(r)
Dim ds As New DataSet
ds.Tables.Add(dt)

您可以使用GetXml中的DataSet方法。

Dim simpleresult As String = ds.GetXml

输出：

<NewDataSet>
  <Table1>
    <Column1>Value1</Column1>
    <Column2>Value2</Column2>
  </Table1>
  <Table1>
    <Column1>Value3</Column1>
    <Column2>Value4</Column2>
  </Table1>
</NewDataSet>

如果您想控制WriteXml，可以使用DataSet或DataTable中的XmlWriteMode种方法。您使用String获得MemoryStream。

Dim result As String
Using ms As New IO.MemoryStream()
    ds.WriteXml(ms, System.Data.XmlWriteMode.WriteSchema)
    result = System.Text.Encoding.UTF8.GetString(ms.ToArray)
End Using

输出：

<NewDataSet>
  <xs:schema id="NewDataSet" xmlns="" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
    <xs:element name="NewDataSet" msdata:IsDataSet="true" msdata:UseCurrentLocale="true">
      <xs:complexType>
        <xs:choice minOccurs="0" maxOccurs="unbounded">
          <xs:element name="Table1">
            <xs:complexType>
              <xs:sequence>
                <xs:element name="Column1" type="xs:string" minOccurs="0" />
                <xs:element name="Column2" type="xs:string" minOccurs="0" />
              </xs:sequence>
            </xs:complexType>
          </xs:element>
        </xs:choice>
      </xs:complexType>
    </xs:element>
  </xs:schema>
  <Table1>
    <Column1>Value1</Column1>
    <Column2>Value2</Column2>
  </Table1>
  <Table1>
    <Column1>Value3</Column1>
    <Column2>Value4</Column2>
  </Table1>
</NewDataSet>

将Datatable导出到xml

1 个答案: