怎么用C#语言实现串口通讯

//
//bool XmlTextReader.Read(): 读取流中下一个节点，当读完最后一个节点再次调用该方法该方法返回false
//XmlNodeType XmlTextReader.NodeType: 该属性返回当前节点的类型
// XmlNodeType.Element 元素节点
// XmlNodeType.EndElement 结尾元素节点
// XmlNodeType.XmlDeclaration 文档的第一个节点
// XmlNodeType.Text 文本节点
//bool XmlTextReader.HasAttributes: 当前节点有没有属性，返回true或false
//string XmlTextReader.Name: 返回当前节点的名称
//string XmlTextReader.Value: 返回当前节点的值
//string XmlTextReader.LocalName: 返回当前节点的本地名称
//string XmlTextReader.NamespaceURI: 返回当前节点的命名空间URI
//string XmlTextReader.Prefix: 返回当前节点的前缀
//bool XmlTextReader.MoveToNextAttribute(): 移动到当前节点的下一个属性
//---------------------------------------------------------------------------------------------------

namespace XMLReading
{
using System;
using System.Xml;
using System.Windows.Forms;
using System.ComponentModel;

/// ＜summary＞
/// Xml文件读取器
/// ＜/summary＞

public class XmlReader : IDisposable
{
private string _xmlPath;
private const string _errMsg = "Error Occurred While Reading ";
private ListBox _listBox;
private XmlTextReader xmlTxtRd;

#region XmlReader 的构造器

public XmlReader()
{
this._xmlPath = string.Empty;
this._listBox = null;
this.xmlTxtRd = null;
}

/// ＜summary＞
/// 构造器
/// ＜/summary＞
/// ＜param name="_xmlPath"＞xml文件绝对路径＜/param＞
/// ＜param name="_listBox"＞列表框用于显示xml＜/param＞

public XmlReader(string _xmlPath, ListBox _listBox)
{
this._xmlPath = _xmlPath;
this._listBox = _listBox;
this.xmlTxtRd = null;
}

#endregion
#region XmlReader 的资源释放方法

/// ＜summary＞
/// 清理该对象所有正在使用的资源

/// ＜/summary＞

public void Dispose()
{
this.Dispose(true);
GC.SuppressFinalize(this);
}

/// ＜summary＞
/// 释放该对象的实例变量
/// ＜/summary＞
/// ＜param name="disposing"＞＜/param＞

protected virtual void Dispose(bool disposing)
{
if (!disposing)
return;
if (this.xmlTxtRd != null)
{
this.xmlTxtRd.Close();
this.xmlTxtRd = null;
}

if (this._xmlPath != null)
{
this._xmlPath = null;
}
}

#endregion
#region XmlReader 的属性

/// ＜summary＞
/// 获取或设置列表框用于显示xml
/// ＜/summary＞

public ListBox listBox
{
get
{
return this._listBox;
}
set
{
this._listBox = value;
}
}

/// ＜summary＞
/// 获取或设置xml文件的绝对路径
/// ＜/summary＞

public string xmlPath
{
get
{
return this._xmlPath;
}
set
{
this._xmlPath = value;
}
}

#endregion

/// ＜summary＞
/// 遍历Xml文件
/// ＜/summary＞

public void EachXml()
{
this._listBox.Items.Clear();
this.xmlTxtRd = new XmlTextReader(this._xmlPath);

try
{
while(xmlTxtRd.Read())
{
this._listBox.Items.Add(this.xmlTxtRd.Value);
}
}
catch(XmlException exp)
{
throw new XmlException(_errMsg + this._xmlPath + exp.ToString());
}
finally
{
if (this.xmlTxtRd != null)
this.xmlTxtRd.Close();
}
}

/// ＜summary＞
/// 读取Xml文件的节点类型
/// ＜/summary＞

public void ReadXmlByNodeType()
{
this._listBox.Items.Clear();
this.xmlTxtRd = new XmlTextReader(this._xmlPath);

try
{
while(xmlTxtRd.Read())
{
this._listBox.Items.Add(this.xmlTxtRd.NodeType.ToString());
}
}
catch(XmlException exp)
{
throw new XmlException(_errMsg + this._xmlPath + exp.ToString());
}
finally
{
if (this.xmlTxtRd != null)
this.xmlTxtRd.Close();
}
}

/// ＜summary＞
/// 根据节点类型过滤Xml文档
/// ＜/summary＞
/// ＜param name="xmlNType"＞XmlNodeType 节点类型的数组＜/param＞

public void FilterByNodeType(XmlNodeType[] xmlNType)
{
this._listBox.Items.Clear();
this.xmlTxtRd = new XmlTextReader(this._xmlPath);
try
{
while(xmlTxtRd.Read())
{
for (int i = 0; i ＜ xmlNType.Length; i++)
{
if (xmlTxtRd.NodeType == xmlNType[i])
{
this._listBox.Items.Add(xmlTxtRd.Name + " is Type " + xmlTxtRd.NodeType.ToString());
}
}
}
}
catch(XmlException exp)
{
throw new XmlException(_errMsg + this.xmlPath + exp.ToString());
}
finally
{
if (this.xmlTxtRd != null)
this.xmlTxtRd.Close();
}
}

/// ＜summary＞
/// 读取Xml文件的所有文本节点值

/// ＜/summary＞

public void ReadXmlTextValue()
{
this._listBox.Items.Clear();
this.xmlTxtRd = new XmlTextReader(this._xmlPath);

try
{
while(xmlTxtRd.Read())
{
if (xmlTxtRd.NodeType == XmlNodeType.Text)
{
this._listBox.Items.Add(xmlTxtRd.Value);
}
}
}
catch(XmlException xmlExp)
{
throw new XmlException(_errMsg + this._xmlPath + xmlExp.ToString());
}
finally
{
if (this.xmlTxtRd != null)
this.xmlTxtRd.Close();
}
}

/// ＜summary＞
/// 读取Xml文件的属性
/// ＜/summary＞

public void ReadXmlAttributes()
{
this._listBox.Items.Clear();
this.xmlTxtRd = new XmlTextReader(this._xmlPath);

try
{
while(xmlTxtRd.Read())
{
if (xmlTxtRd.NodeType == XmlNodeType.Element)
{
if (xmlTxtRd.HasAttributes)
{
this._listBox.Items.Add("The Element " + xmlTxtRd.Name + " has " + xmlTxtRd.AttributeCount + " Attributes");

this._listBox.Items.Add("The Attributes are:");

while(xmlTxtRd.MoveToNextAttribute())
{
this._listBox.Items.Add(xmlTxtRd.Name + " = " + xmlTxtRd.Value);
}
}
else
{
this._listBox.Items.Add("The Element " + xmlTxtRd.Name + " has no Attribute");
}
this._listBox.Items.Add("");
}
}
}
catch(XmlException xmlExp)
{
throw new XmlException(_errMsg + this._xmlPath + xmlExp.ToString());
}
finally
{
if (this.xmlTxtRd != null)
this.xmlTxtRd.Close();
}
}

/// ＜summary＞
/// 读取Xml文件的命名空间
/// ＜/summary＞

public void ReadXmlNamespace()
{
this._listBox.Items.Clear();
this.xmlTxtRd = new XmlTextReader(this._xmlPath);
try
{
while(xmlTxtRd.Read())
{
if (xmlTxtRd.NodeType == XmlNodeType.Element && xmlTxtRd.Prefix != "")
{
this._listBox.Items.Add("The Prefix " + xmlTxtRd.Prefix + " is associated with namespace " + xmlTxtRd.NamespaceURI);

this._listBox.Items.Add("The Element with the local name " + xmlTxtRd.LocalName + " is associated with" + " the namespace " + xmlTxtRd.NamespaceURI);
}

if (xmlTxtRd.NodeType == XmlNodeType.Element && xmlTxtRd.HasAttributes)
{
while(xmlTxtRd.MoveToNextAttribute())
{
if (xmlTxtRd.Prefix != "")
{
this._listBox.Items.Add("The Prefix " + xmlTxtRd.Prefix + " is associated with namespace " + xmlTxtRd.NamespaceURI);

this._listBox.Items.Add("The Attribute with the local name " + xmlTxtRd.LocalName + " is associated with the namespace " + xmlTxtRd.NamespaceURI);

}
}
}
}
}
catch(XmlException xmlExp)
{
throw new XmlException(_errMsg + this._xmlPath + xmlExp.ToString());
}
finally
{
if (this.xmlTxtRd != null)
this.xmlTxtRd.Close();
}
}

/// ＜summary＞
/// 读取整个Xml文件
/// ＜/summary＞

public void ReadXml()
{
string attAndEle = string.Empty;
this._listBox.Items.Clear();
this.xmlTxtRd = new XmlTextReader(this._xmlPath);

try
{
while(xmlTxtRd.Read())
{
if (xmlTxtRd.NodeType == XmlNodeType.XmlDeclaration)
this._listBox.Items.Add(string.Format("＜?{0} {1} ?＞",xmlTxtRd.Name,xmlTxtRd.Value));
else if (xmlTxtRd.NodeType == XmlNodeType.Element)
{
attAndEle = string.Format("＜{0} ",xmlTxtRd.Name);
if (xmlTxtRd.HasAttributes)
{
while(xmlTxtRd.MoveToNextAttribute())
{
attAndEle = attAndEle + string.Format("{0}='{1}' ",xmlTxtRd.Name,xmlTxtRd.Value);
}
}

attAndEle = attAndEle.Trim() + "＞";
this._listBox.Items.Add(attAndEle);
}
else if (xmlTxtRd.NodeType == XmlNodeType.EndElement)
this._listBox.Items.Add(string.Format("＜/{0}＞",xmlTxtRd.Name));
else if (xmlTxtRd.NodeType == XmlNodeType.Text)
this._listBox.Items.Add(xmlTxtRd.Value);
}
}
catch(XmlException xmlExp)
{
throw new XmlException(_errMsg + this._xmlPath + xmlExp.ToString());
}
finally
{
if (this.xmlTxtRd != null)
this.xmlTxtRd.Close();
}
}
}
}

窗体代码如下：

namespace XMLReading

{

using System;

using System.Drawing;

using System.Collections;

using System.ComponentModel;

using System.Windows.Forms;

using System.Data;

using System.Xml;

public class Form1 : System.Windows.Forms.Form

{

private System.Windows.Forms.ListBox listBox1;

private System.Windows.Forms.Button button1;

private System.Windows.Forms.Button button2;

private System.Windows.Forms.Button button3;

private System.Windows.Forms.Button button4;

private System.Windows.Forms.Button button5;

private System.Windows.Forms.Button button6;

private System.Windows.Forms.Button button7;

private string xmlPath;

private XmlReader xRead;

/// ＜summary＞

/// 必需的设计器变量。

/// ＜/summary＞

private System.ComponentModel.Container components = null;

public Form1()

{

InitializeComponent();

}

/// ＜summary＞

/// 清理所有正在使用的资源。

/// ＜/summary＞

protected override void Dispose( bool disposing )

{

if( disposing )

{

if (components != null)

{

components.Dispose();

}

}

base.Dispose( disposing );

}

#region Windows 窗体设计器生成的代码

/// ＜summary＞

/// 设计器支持所需的方法 - 不要使用代码编辑器修改

/// 此方法的内容。

/// ＜/summary＞

private void InitializeComponent()

{

this.listBox1 = new System.Windows.Forms.ListBox();

this.button1 = new System.Windows.Forms.Button();

this.button2 = new System.Windows.Forms.Button();

this.button3 = new System.Windows.Forms.Button();

this.button4 = new System.Windows.Forms.Button();

this.button5 = new System.Windows.Forms.Button();

this.button6 = new System.Windows.Forms.Button();

this.button7 = new System.Windows.Forms.Button();

this.SuspendLayout();

//

// listBox1

//

this.listBox1.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)

| System.Windows.Forms.AnchorStyles.Left)

| System.Windows.Forms.AnchorStyles.Right)));

this.listBox1.ItemHeight = 12;

this.listBox1.Location = new System.Drawing.Point(8, 8);

this.listBox1.Name = "listBox1";

this.listBox1.Size = new System.Drawing.Size(716, 460);

this.listBox1.TabIndex = 0;

//

// button1

//

this.button1.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)));

this.button1.Location = new System.Drawing.Point(8, 488);

this.button1.Name = "button1";

this.button1.TabIndex = 1;

this.button1.Text = "Example1";

this.button1.Click += new System.EventHandler(this.button1_Click);

//

// button2

//

this.button2.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)));

this.button2.Location = new System.Drawing.Point(96, 488);

this.button2.Name = "button2";

this.button2.TabIndex = 2;

this.button2.Text = "Example2";

this.button2.Click += new System.EventHandler(this.button2_Click);

//

// button3

//

this.button3.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Right)));

this.button3.Location = new System.Drawing.Point(648, 488);

this.button3.Name = "button3";

this.button3.TabIndex = 3;

this.button3.Text = "Example7";

this.button3.Click += new System.EventHandler(this.button3_Click);

//

// button4

//

this.button4.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)));

this.button4.Location = new System.Drawing.Point(184, 488);

this.button4.Name = "button4";

this.button4.TabIndex = 4;

this.button4.Text = "Example3";

this.button4.Click += new System.EventHandler(this.button4_Click);

//

// button5

//

this.button5.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)));

this.button5.Location = new System.Drawing.Point(272, 488);

this.button5.Name = "button5";

this.button5.TabIndex = 5;

this.button5.Text = "Example4";

this.button5.Click += new System.EventHandler(this.button5_Click);

//

// button6

//

this.button6.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)));

this.button6.Location = new System.Drawing.Point(360, 488);

this.button6.Name = "button6";

this.button6.TabIndex = 6;

this.button6.Text = "Example5";

this.button6.Click += new System.EventHandler(this.button6_Click);

//

// button7

//

this.button7.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left)));

this.button7.Location = new System.Drawing.Point(448, 488);

this.button7.Name = "button7";

this.button7.TabIndex = 7;

this.button7.Text = "Example6";

this.button7.Click += new System.EventHandler(this.button7_Click);

//

// Form1

//

this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);

this.ClientSize = new System.Drawing.Size(728, 517);

this.Controls.Add(this.button7);

this.Controls.Add(this.button6);

this.Controls.Add(this.button5);

this.Controls.Add(this.button4);

this.Controls.Add(this.button3);

this.Controls.Add(this.button2);

this.Controls.Add(this.button1);

this.Controls.Add(this.listBox1);

this.Name = "Form1";

this.Text = "XMLReader";

this.ResumeLayout(false);

//

// xmlPath

//

this.xmlPath = "sample.xml";

}

#endregion

/// ＜summary＞

/// 应用程序的主入口点。

/// ＜/summary＞

[STAThread]

static void Main()

{

Application.Run(new Form1());

}

private void button1_Click(object sender, System.EventArgs e)

{

xRead = new XmlReader(this.xmlPath,this.listBox1);

try

{

xRead.EachXml();

}

catch(XmlException xmlExp)

{

MessageBox.Show(xmlExp.ToString(),"Error",MessageBoxButtons.OK,MessageBoxIcon.Error);

}

catch(Exception exp)

{

MessageBox.Show(exp.ToString(),"Error",MessageBoxButtons.OK,MessageBoxIcon.Error);

}

finally

{

xRead.Dispose();

}

}

private void button2_Click(object sender, System.EventArgs e)

{

xRead = new XmlReader(this.xmlPath,this.listBox1);

try

{

xRead.ReadXmlByNodeType();

}

catch(XmlException xmlExp)

{

MessageBox.Show(xmlExp.ToString(),"Error",MessageBoxButtons.OK,MessageBoxIcon.Error);

}

catch(Exception exp)

{

MessageBox.Show(exp.ToString(),"Error",MessageBoxButtons.OK,MessageBoxIcon.Error);

}

finally

{

xRead.Dispose();

}

}

private void button3_Click(object sender, System.EventArgs e)

{

XmlNodeType[] xmlNType = {XmlNodeType.Element, XmlNodeType.EndElement, XmlNodeType.XmlDeclaration};

xRead = new XmlReader(this.xmlPath, this.listBox1);

try

{

xRead.FilterByNodeType(xmlNType);

}

catch(XmlException xmlExp)

{

MessageBox.Show(xmlExp.ToString(),"Error",MessageBoxButtons.OK,MessageBoxIcon.Error);

}

catch(Exception exp)

{

MessageBox.Show(exp.ToString(),"Error",MessageBoxButtons.OK,MessageBoxIcon.Error);

}

finally

{

xRead.Dispose();

}

}

private void button4_Click(object sender, System.EventArgs e)

{

xRead = new XmlReader(this.xmlPath, this.listBox1);

try

{

xRead.ReadXmlTextValue();

}

catch(XmlException xmlExp)

{

MessageBox.Show(xmlExp.ToString(),"Error",MessageBoxButtons.OK,MessageBoxIcon.Error);

}

catch(Exception exp)

{

MessageBox.Show(exp.ToString(),"Error",MessageBoxButtons.OK,MessageBoxIcon.Error);

}

finally

{

xRead.Dispose();

}

}

private void button5_Click(object sender, System.EventArgs e)

{

xRead = new XmlReader(this.xmlPath, this.listBox1);

try

{

xRead.ReadXmlAttributes();

}

catch(XmlException xmlExp)

{

MessageBox.Show(xmlExp.ToString(),"Error",MessageBoxButtons.OK,MessageBoxIcon.Error);

}

catch(Exception exp)

{

MessageBox.Show(exp.ToString(),"Error",MessageBoxButtons.OK,MessageBoxIcon.Error);

}

finally

{

xRead.Dispose();

}

}

private void button6_Click(object sender, System.EventArgs e)

{

xRead = new XmlReader(this.xmlPath, this.listBox1);

try

{

xRead.ReadXmlNamespace();

}

catch(XmlException xmlExp)

{

MessageBox.Show(xmlExp.ToString(),"Error",MessageBoxButtons.OK,MessageBoxIcon.Error);

}

catch(Exception exp)

{

MessageBox.Show(exp.ToString(),"Error",MessageBoxButtons.OK,MessageBoxIcon.Error);

}

finally

{

xRead.Dispose();

}

}

private void button7_Click(object sender, System.EventArgs e)

{

xRead = new XmlReader(this.xmlPath, this.listBox1);

try

{

xRead.ReadXml();

}

catch(XmlException xmlExp)

{

MessageBox.Show(xmlExp.ToString(),"Error",MessageBoxButtons.OK,MessageBoxIcon.Error);

}

catch(Exception exp)

{

MessageBox.Show(exp.ToString(),"Error",MessageBoxButtons.OK,MessageBoxIcon.Error);

}

finally

{

xRead.Dispose();

}

}

}

}