学习Professional ASP.NET 2.0 XML(二)

学习Professional ASP.NET 2.0 XML(二)

       这次继续学习XML编写器.直接看代码吧.比较简单

只需要了解其中的几个方法就好

WriteStartDocument 方法书写版本为“1.0”并具有独立属性的 XML 声明

WriteComment 方法注释

WriteStartElement 方法写出指定的开始标记

WriteAttributeString 方法写出具有指定值的属性

WriteElementString 方法    写出包含字符串值的元素

WriteEndElement 方法结束标记

WriteEndDocument 方法结束标记

上面有两个标记是一一对应的.最后都要结束标记.这样就算创建一个XML文件成功了.但会发现创建的XML文件全在一行显示.
这里就要用要XmlWriterSettings来设置XML功能了

1XmlWriterSettings settings = new XmlWriterSettings();
2settings.Indent = true;
3settings.ConformanceLevel = ConformanceLevel.Auto;
4settings.IndentChars = "\t";
5settings.OmitXmlDeclaration = false;

然后重载Create()方法就好了.这样创建的XML文件就不会写在一行了.

根据命名空间写入XML

<%@ Page Language="C#" %>

<%@ Import Namespace="System.Xml" %>

<script runat="server">
    void Page_Load(object sender, EventArgs e)
    {

        string xmlFilePath = Request.PhysicalApplicationPath + @"\Employ.xml";
        XmlWriterSettings settings = new XmlWriterSettings();
        settings.Indent = true;
        settings.ConformanceLevel = ConformanceLevel.Auto;
        settings.IndentChars = "\t";
        settings.OmitXmlDeclaration = false;
        try
        {
            using (XmlWriter writer = XmlWriter.Create(xmlFilePath,settings))
            {
                //书写声明
                writer.WriteStartDocument(false);
                //写入标记开始
                writer.WriteStartElement("employees");

                writer.WriteAttributeString("xmlns", "emp", null, "urn:employees-wrox");
                writer.WriteStartElement("employee", "urn:employees-wrox");
                /**//* You can also use this approach to declare the namespace
                string prefix = writer.LookupPrefix("urn:employees-wrox");
                writer.WriteStartElement(prefix, "employee", null);
                */
                writer.WriteAttributeString("id", "1");
                writer.WriteStartElement("name", "urn:employees-wrox");
                writer.WriteElementString("firstName", "urn:employees-wrox", "Nancy");
                writer.WriteElementString("lastName", "urn:employees-wrox", "lastName");
                writer.WriteEndElement();
                writer.WriteElementString("city", "urn:employees-wrox", "Seattle");
                writer.WriteElementString("state", "urn:employees-wrox", "WA");
                writer.WriteElementString("zipCode", "urn:employees-wrox", "98122");
                writer.WriteEndElement();
                writer.WriteEndElement();
                writer.WriteEndDocument();

                writer.Flush();
                lblResult.Text = "写入成功";
            }
        }
        catch (Exception ex)
        {
            lblResult.Text = "发生错误:" + ex.Message;
        }
    }

</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Writing XML File</title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <asp:Label ID="lblResult" runat="server" />
        </div>
    </form>
</body>
</html>

简单的就是重载其中的几个方法就可以了

最后一个例子

将数据以二进制的方式写入XML中

1<%@ Page Language="C#" %>
2
3<%@ Import Namespace="System.Xml" %>
4<%@ Import Namespace="System.IO" %>
5
6<script runat="server">
7    void Page_Load(object sender, EventArgs e)
8    {
9
10        string xmlFilePath = Request.PhysicalApplicationPath + @"\jpgexample.xml";
11        string imageFileName = Request.PhysicalApplicationPath + @"\Employee.jpg";
12        try
13        {
14            using (XmlWriter writer = XmlWriter.Create(xmlFilePath))
15            {
16
17                writer.WriteStartDocument(false);
18                writer.WriteStartElement("employee");
19                writer.WriteAttributeString("id", "1");
20                writer.WriteStartElement("image");
21                writer.WriteAttributeString("fileName", imageFileName);
22                //获取文件大小
23                FileInfo fi = new FileInfo(imageFileName);
24                int size = (int)fi.Length;
25                //读取文件
26                byte[] imgBytes = new byte[size];
27                FileStream stream = new FileStream(imageFileName, FileMode.Open);
28                BinaryReader reader = new BinaryReader(stream);
29                imgBytes = reader.ReadBytes(size);
30                reader.Close();
31                //写入数据
32                //将指定的二进制字节编码为 BinHex 并写出结果文本
33                writer.WriteBinHex(imgBytes, 0, size);
34                writer.WriteEndElement();
35                writer.WriteEndElement();
36                writer.WriteEndDocument();
37
38                writer.Flush();
39                lblResult.Text = "写入成功";
40            }
41        }
42        catch (Exception ex)
43        {
44            lblResult.Text = "发生错误: " + ex.Message;
45        }
46    }
47
48</script>
49
50<html xmlns="http://www.w3.org/1999/xhtml">
51<head runat="server">
52    <title>Writing Images using XmlWriter</title>
53</head>
54<body>
55    <form id="form1" runat="server">
56        <div>
57            <asp:Label ID="lblResult" runat="server" />
58        </div>
59    </form>
60</body>
61</html>
62

主要用到System.IO文件的操作.跟XML的操作没多大的关系
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原文地址：https://www.cnblogs.com/Clingingboy/p/376387.html