XML 增、删、改、求平均数

最新推荐文章于 2021-03-24 18:52:15 发布

原创最新推荐文章于 2021-03-24 18:52:15 发布 · 744 阅读

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文章标签：

#xml #object #file #class #list #string

本文介绍如何使用C#进行XML文件的基本操作，包括创建、插入、搜索、修改和删除节点等内容，并提供了一个简单的示例来演示这些操作的具体实现。

string file = "c://work.xml";
        private void btnCearte_Click(object sender, EventArgs e)
        {
            XmlDocument doc = new XmlDocument();
            XmlDeclaration dl = doc.CreateXmlDeclaration("1.0", "Unicode", null);
            doc.AppendChild(dl);
            XmlElement @class = doc.CreateElement("class");
            doc.AppendChild(@class);
            doc.Save(file);
        }

        private void btnInsert_Click(object sender, EventArgs e)
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(file);
            XmlElement student = doc.CreateElement("student");
            student.SetAttribute("age", "20");
            XmlElement name = doc.CreateElement("name");
            name.InnerText = "demo_name";
            XmlElement sex = doc.CreateElement("sex");
            sex.InnerText = "famale";
            student.AppendChild(name);
            student.AppendChild(sex);
            XmlNode @class = doc.SelectSingleNode("class");
            @class.AppendChild(student);
            doc.Save(file);
        }

        private void btnSearch_Click(object sender, EventArgs e)
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(file);
            XmlNodeList list = doc.SelectNodes("//student[name='demo_name]");
            foreach (XmlNode item in list)
            {
                this.Text = item.FirstChild.InnerText;
            }
        }

        private void btnModify_Click(object sender, EventArgs e)
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(file);
            XmlNode result = doc.SelectSingleNode("//student/sex[../name='demo_name]");
            result.InnerText = "未知";
            doc.Save(file);
        }

        private void btnDelete_Click(object sender, EventArgs e)
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(file);
            XmlNodeList list = doc.SelectNodes("//student");
            for (int i = 0; i < list.Count; i++)
            {
                list[i].ParentNode.RemoveChild(list[i]);
            }
            doc.Save(file);
        }

        private void btnAvg_Click(object sender, EventArgs e)
        {
            XmlDocument doc = new XmlDocument();
            doc.Load(file);
            XmlNodeList ages = doc.SelectNodes("//student");
            int sum = 0;
            foreach (XmlNode item in ages)
            {
                sum += int.Parse((item as XmlElement).GetAttribute("age"));
            }
            this.Text = (sum / ages.Count).ToString();
        }