C# 简单的操作xml读取与追加节点

public partial class Form1 : Form

{

string openpath = "";

int datacount = 0;

public Form1()

{

InitializeComponent();

}

/*

一、打开文件对话框(OpenFileDialog)

　 　1、 OpenFileDialog控件有以下基本属性

InitialDirectory 对话框的初始目录

Filter 要在对话框中显示的文件筛选器，例如，"文本文件(*.txt)|*.txt|所有文件(*.*)||*.*"

FilterIndex 在对话框中选择的文件筛选器的索引，如果选第一项就设为1

RestoreDirectory 控制对话框在关闭之前是否恢复当前目录

FileName 第一个在对话框中显示的文件或最后一个选取的文件

Title 将显示在对话框标题栏中的字符

AddExtension 是否自动添加默认扩展名

CheckPathExists

在对话框返回之前，检查指定路径是否存在

DefaultExt 默认扩展名

DereferenceLinks 在从对话框返回前是否取消引用快捷方式

ShowHelp

启用"帮助"按钮

ValiDateNames 控制对话框检查文件名中是否不含有无效的字符或序列

　　 2、 OpenFileDialog控件有以下常用事件

FileOk 当用户点击"打开"或"保存"按钮时要处理的事件

HelpRequest 当用户点击"帮助"按钮时要处理的事件

*/

#region 打开ＸＭＬ文件

/// <summary>

/// 打开ＸＭＬ文件

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void btnOpenXML_Click(object sender, EventArgs e)

{

string dir = "D:\\测试的xml文件夹";

if (!Directory.Exists(dir))

{

Directory.CreateDirectory(dir);

}

OpenFileDialog openfile = new OpenFileDialog();

openfile.InitialDirectory = dir;//注意这里写路径时要用c:\\而不是c:\

openfile.Filter = "*.xml|*.*"; // "文本文件|*.*|C#文件|*.cs|所有文件|*.*";

openfile.RestoreDirectory = true;

DialogResult result = openfile.ShowDialog();

if (result == DialogResult.OK)

{

dataGridView1.Rows.Clear();

string path = openfile.FileName;

openpath = path;

OpenXMLFile(path);

}

}

#endregion

#region 保存xml文件

/// <summary>

/// 保存xml文件

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void btnSaveXML_Click(object sender, EventArgs e)

{

SavaXML(openpath);

}

#endregion

#region 读取xml文件中的信息

/// <summary>

/// 读取xml文件中的信息

/// </summary>

/// <param name="path">打开文件的路径</param>

private void OpenXMLFile(string path)

{

try

{

XmlDocument xmldoc = new XmlDocument();

if (File.Exists(path))

{

xmldoc.Load(path);

XmlNode root = xmldoc.SelectSingleNode("Courses");

if(root.HasChildNodes)

{

foreach (XmlNode node in root.SelectNodes("Course"))

{

XmlElement elem = (XmlElement)node;

string name = elem.GetAttribute("name");

string teacher = elem.GetAttribute("teacher");

XmlElement classelem = (XmlElement)node.SelectSingleNode("classes");

string classname = classelem.InnerText;

XmlElement stuelem = (XmlElement)node.SelectSingleNode("student");

string stucount = stuelem.InnerText;

//DataGridViewRow row = new DataGridViewRow();

////row.Cells["Course"].Value = name;

////row.Cells["classname"].Value = classname;

////row.Cells["teacher"].Value = teacher;

////row.Cells["student"].Value = stucount;

//row.Cells[0].Value = name;

//row.Cells[1].Value = classname;

//row.Cells[2].Value = teacher;

//row.Cells[3].Value = stucount;

dataGridView1.Rows.Add(name,classname,teacher,stucount);

}

datacount = dataGridView1.Rows.Count;

}

}

}

catch (Exception ex)

{

MessageBox.Show(ex.Message);

}

}

#endregion

#region 保存XML文件信息

/// <summary>

/// 保存XML文件信息

/// </summary>

/// <param name="path"></param>

private void SavaXML(string path)

{

try

{

if (File.Exists(openpath))

{

XmlDocument xmlDoc = new XmlDocument();

xmlDoc.Load(path);

XmlNode root = xmlDoc.SelectSingleNode("Courses");//查找<Employees>

for (int i = datacount-1; i < dataGridView1.Rows.Count-1; i++)

{

string Course = dataGridView1.Rows[i].Cells["Course"].Value.ToString();

string classname = dataGridView1.Rows[i].Cells["classname"].Value.ToString();

string teacher = dataGridView1.Rows[i].Cells["teacher"].Value.ToString();

string student = dataGridView1.Rows[i].Cells["student"].Value.ToString();

XmlElement courseElem = xmlDoc.CreateElement("Course");//创建一个<Node>节点

courseElem.SetAttribute("name", Course);//设置该节点genre属性

courseElem.SetAttribute("teacher", teacher);//设置该节点ISBN属性

XmlElement classes = xmlDoc.CreateElement("classes");

classes.InnerText = classname;//设置文本节点

courseElem.AppendChild(classes);//添加到<Node>节点中

XmlElement studentElem = xmlDoc.CreateElement("student");

studentElem.InnerText = student;//设置文本节点

courseElem.AppendChild(studentElem);//添加到<Node>节点中

root.AppendChild(courseElem);//添加到<Employees>节点中

}

xmlDoc.Save(path);

}

}

catch (Exception ex)

{

MessageBox.Show(ex.Message);

}

}

#endregion

#region 新增信息

/// <summary>

/// 新增信息

/// </summary>

/// <param name="sender"></param>

/// <param name="e"></param>

private void btnAdd_Click(object sender, EventArgs e)

{

string course = txtCourse.Text.Trim();

string classname = txtClass.Text.Trim();

string teacher = txtTeacher.Text.Trim();

string count = txtCourse.Text.Trim();

if (course == "")

{

MessageBox.Show("课程不能为空");

return;

}

if (classname == "")

{

MessageBox.Show("班级不能为空");

return;

}

if (teacher == "")

{

MessageBox.Show("老师不能为空");

return;

}

if (count == "")

{

MessageBox.Show("学生数不能为空");

return;

}

dataGridView1.Rows.Add(course, classname, teacher, count);

}

#endregion

}