自動格式化長的externalXml字符串

Question

我有多個大型XML文件，正在嘗試提取特定元素及其子元素的5個實例。 我已經設置了所有代碼，但是，我必須使用StreamWriter來寫出xml。 我該怎么做才能使其正確縮進等等。

該字符串類似於以下內容：

<SampleMAIN><Sample type="1"><Sample_Batch>123
</Sample_Batch><SampleMethod>
</SampleMethod>
</Sample></SampleMAIN>

我希望它看起來像這樣：

<SampleMAIN>
    <Sample type="1">
        <Sample_Batch>123
    </Sample_Batch>
        <SampleMethod>1
    </SampleMethod>
</SampleMAIN>

Answer 1

使用StreamWriter，下面的代碼將輸出所需的格式並附加到現有的xml文件中。

Private Sub Button1_Click(sender As System.Object, _
                          e As System.EventArgs) Handles Button1.Click

    Dim sw As System.IO.StreamWriter

    Dim St As String = "1"
    Dim Sb As String = "123"
    Dim Sm As String = "1"

    sw = File.AppendText("C:\XML_Files\sampler_02.xml")
    sw.WriteLine("<SampleMAIN>")
    sw.WriteLine("    <Sample type=" & """" & St & """" & ">")
    sw.WriteLine("        <Sample_Batch>" & Sb)
    sw.WriteLine("    </Sample_Batch>")
    sw.WriteLine("        <SampleMethod>" & Sm)
    sw.WriteLine("    </SampleMethod>")
    sw.WriteLine("</SampleMAIN>")
    sw.Close()

End Sub

Answer 2

因此，對於可能遇到此問題並對我的解決方案感興趣的任何人，這就是我所使用的...

    Dim dir As New DirectoryInfo("D:\data")
    Dim sw As New StreamWriter("C:\Documents\largeFile.xml")
    Dim xd As New XmlDocument
    Dim iCount As Integer

    sw.WriteLine("<?xml version=""1.0"" encoding=""ISO-8859-1""?>" & vbCrLf & "<Root>")

    For Each fi As FileInfo In dir.GetFiles()
        xd.Load(fi.FullName)
        iCount = 0

        For Each xn As XmlNode In xd.SelectNodes("//Root")          
            For Each xe As XmlElement In xn.ChildNodes
                iCount += 1
                sw.WriteLine(xe.OuterXml.ToString)
                If iCount = 5 Then Exit For
            Next
            Exit For
        Next

    Next

    sw.WriteLine("</Root>")

    sw.Flush() : sw.Close() : sw.Dispose()