C#操作Xml全集（1）

输电线路设计系统中要保存导线数据，首先想到的是数据来保存，但又想了一下，感觉比较麻烦，数据库移植起来

是很麻烦的事，老是出错，反正是做的二次开发包，简单易用，功能强大是首要的，你不可能要你的二次开发用户去配置半天的数据库吧！

如实想到用Xml来存储一些量不大的数据，如气象条件，导线，绝缘子等等，读取方便，并不需要考虑安全性的问题，Xml同样可以进行复杂查询操作，功能强劲。

昨天到微软msdn上查了查，找到了相关的代码示例，现在贴出来，大家可以下载试用，安装到vs2005智能代码段中，非常方便。

public class ManagementXml
    ...{
        public ManagementXml()
        ...{
        }
         /**//// <summary>
            /// 添加元素
            /// </summary>
            public void AddElement()
            ...{
                System.Xml.XmlNode newElement;
                newElement = xml.CreateElement("Keyword");
                newElement.InnerText = "Value";
                xml.AppendChild(newElement);
            }
            /**//// <summary>
            /// 列举所有属性
            /// </summary>
            public void EnumAttribute()
            ...{
                foreach (System.Xml.XmlAttribute attribute in node.Attributes)
                ...{

                }
            }
            /**//// <summary>
            /// 查到节点名
            /// </summary>
            public void Find_A_Node()
            ...{
                System.Xml.XmlNodeList nodes;
                nodes = xml.GetElementsByTagName("ElementName");
            }
            /**//// <summary>
            /// 从Xml文件中提出模式
            /// </summary>
            public void Infer_A_Schema_From_A_Xml()
            ...{
                // Gets the schema.
                System.Xml.Schema.XmlSchemaInference infer = new System.Xml.Schema.XmlSchemaInference();
                System.Xml.Schema.XmlSchemaSet sc = new System.Xml.Schema.XmlSchemaSet();
                sc = infer.InferSchema(new System.Xml.XmlTextReader("sample.xml"));
                // Writes the schema.
                System.Xml.XmlWriter w = System.Xml.XmlWriter.Create(new System.IO.StreamWriter("sampleSchema.xsd"));

                foreach (System.Xml.Schema.XmlSchema schema in sc.Schemas())
                ...{
                    schema.Write(w);
                }

                // Update the schema with another xml fragment.
                sc = infer.InferSchema(System.Xml.XmlReader.Create("anothersample.xml"), sc);
                w = System.Xml.XmlWriter.Create(new System.IO.StreamWriter("anotherschema.xsd"));
                foreach (System.Xml.Schema.XmlSchema schema in sc.Schemas())
                ...{
                    schema.Write(w);
                }

            }
            /**//// <summary>
            /// 重新声明已命名节点
            /// </summary>
            public void Iterate_Named_Nodes()
            ...{
                foreach (System.Xml.XmlNode node in xmlDoc.GetElementsByTagName("ElementName"))
                ...{
                    
                }
            }
            /**//// <summary>
            /// 用XPathNavigator导航数据
            /// </summary>
            public void NavigateData_with_XPathNavigator()
            ...{
                System.Xml.XPath.XPathNavigator nav = xmlDoc.CreateNavigator();

                // Move to the first non-comment element.
                nav.MoveToChild(System.Xml.XPath.XPathNodeType.Element);

                System.Xml.XPath.XPathNodeIterator nodeIterator = nav.SelectChildren(System.Xml.XPath.XPathNodeType.Element);

                while (nodeIterator.MoveNext())
                ...{
                    
                }
            }
            /**//// <summary>
            /// 从Xml中读取数据到类
            /// </summary>
            public void Read_ClassData_From_Xml()
            ...{
                System.Xml.XmlSerializer reader = new System.Xml.XmlSerializer(typeof(TheClass));
                using (System.IO.StreamReader file = new System.IO.StreamReader(@"ClassData.xml"))
                ...{
                    TheClass fileData;

                    fileData = (TheClass)reader.Deserialize(file);
                }
            }
            /**//// <summary>
            /// 用XmlTextReader读取数据
            /// </summary>
            public void Read_Data_With_XmlTextReader()
            ...{
                System.Xml.XmlTextReader reader = new System.Xml.XmlTextReader("Snippet.xml");

                string contents = reader.ReadInnerXml();
            }
            /**//// <summary>
            /// 从字符串读取Xml
            /// </summary>
            public void Read_Xml_Form_String()
            ...{
                // Create the reader.
                System.Xml.XmlReader reader = System.Xml.XmlReader.Create(new System.IO.StringReader("<book>"));

                while (reader.Read())
                ...{
                    
                }
            }
            /**//// <summary>
            /// 从Url读取Xml
            /// </summary>
            public void ReadXmlFromUrl()
            ...{
                string myUrl = "http://www.contoso.com/books.xml";
                System.Xml.XmlReader reader = System.Xml.XmlReader.Create(myUrl);

                while (reader.Read())
                ...{
                    
                }
            }
            /**//// <summary>
            /// 用XPathNavigator读取节点数据，相当与sql查询，当然可以进行更新，查询，删除，添加了
            /// </summary>
            public void Selet_Nodes_With_XPathNavigator()
            ...{
                System.Xml.XPath.XPathExpression myXPathExpr;
                System.Xml.XPath.XPathDocument myXPathDocument = new System.Xml.XPath.XPathDocument(@"data.xml");
                // Create an XPathNavigator.
                System.Xml.XPath.XPathNavigator myXPathNavigator = myXPathDocument.CreateNavigator();
                // Get the Book elements.          
                string selectExpr = "parent/child";
                // Ensure we are at the root node.          
                myXPathNavigator.MoveToRoot();
                myXPathExpr = myXPathNavigator.Compile(selectExpr);
                // Create an XPathNodeIterator to walk over the selected nodes.
                System.Xml.XPath.XPathNodeIterator myXPathNodeIterator = myXPathNavigator.Select(myXPathExpr);
            }
            /**//// <summary>
            /// 用XSl sheet将XMl转化为Html
            /// </summary>
            public void Transform_Xml_To_Html_Using_Xsl()
            ...{
                using (System.IO.FileStream stream = System.IO.File.Open("output.html", System.IO.FileMode.Create))
                ...{
                    // Create XsltCommand compile stylesheet.
                    System.Xml.Xsl.XslCompiledTransform processor = new System.Xml.Xsl.XslCompiledTransform();
                    processor.Load("stylesheet.xsl");

                    // Transform the file.
                    processor.Transform("data.xml", null, stream);
                }
            }
            /**//// <summary>
            /// 用XSlT将XMl转化为Html
            /// </summary>
            public void Transform_Xml_To_Html_Using_Xslt()
            ...{
                System.Xml.Xsl.XslCompiledTransform xslt = new System.Xml.Xsl.XslCompiledTransform();

                xslt.Load("theXsltFile.xslt");
                xslt.Transform("theXmlFile.xml", "theOutputFile.html");
            }
            /**//// <summary>
            /// 将类的数据写入Xml
            /// </summary>
            public void WriteClassDataToXml()
            ...{
                System.Xml.Serialization.XmlSerializer writer = new System.Xml.Serialization.XmlSerializer(typeof(System.Collections.ArrayList));

                using (System.IO.StreamWriter file = new System.IO.StreamWriter("SerializedData.xml"))
                ...{
                    writer.Serialize(file, dataToWrite);
                }
            }

    }