C#：XML操作总结2 包括读取、插入、修改、删除
1、读取节点中某一个属性的值
/// <summary>
/// 读取节点中某一个属性的值。如果attribute为空，则返回整个节点的InnerText，否则返回具体attribute的值
/// </summary>
/// <param name="path">xml文件路径</param>
/// <param name="node">节点</param>
/// <param name="attribute">节点中的属性</param>
/// <returns>如果attribute为空，则返回整个节点的InnerText，否则返回具体attribute的值</returns>
/// 使用实例: XMLHelper.Read(path, "PersonF/person[@Name='Person2']", "");
/// XMLHelper.Read(path, "PersonF/person[@Name='Person2']", "Name");
public
static
string
Read(
string
path,
string
node,
string
attribute)
{
string
value =
""
;
try
{
XmlDocument doc =
new
XmlDocument();
doc.Load(path);
XmlNode xn = doc.SelectSingleNode(node);
value = (attribute.Equals(
""
) ? xn.InnerText : xn.Attributes[attribute].Value);
}
catch
(Exception e)
{
Console.WriteLine(e.Message);
}
return
value;
}
|
2、 向节点中增加节点元素，属性
/// <summary>
/// 向节点中增加节点元素，属性
/// </summary>
/// <param name="path">路径</param>
/// <param name="node">要操作的节点</param>
/// <param name="element">要增加的节点元素，可空可不空。非空时插入新的元素，否则插入该元素的属性</param>
/// <param name="attribute">要增加的节点属性，可空可不空。非空时插入元素值，否则插入元素值</param>
/// <param name="value">要增加的节点值</param>
/// 使用实例：XMLHelper.Insert(path, "PersonF/person[@Name='Person2']","Num", "ID", "88");
/// XMLHelper.Insert(path, "PersonF/person[@Name='Person2']","Num", "", "88");
/// XMLHelper.Insert(path, "PersonF/person[@Name='Person2']", "", "ID", "88");
public
static
void
Insert(
string
path,
string
node,
string
element,
string
attribute,
string
value)
{
try
{
XmlDocument doc =
new
XmlDocument();
doc.Load(path);
XmlNode xn = doc.SelectSingleNode(node);
//如果element，则增加该属性
if
(
string
.IsNullOrEmpty(element))
{
//如果attribute不为空，增加该属性
if
(!
string
.IsNullOrEmpty(attribute))
{
XmlElement xe = (XmlElement)xn;
// <person Name="Person2" ID="88"> XMLHelper.Insert(path, "PersonF/person[@Name='Person2']","Num", "ID", "88");
xe.SetAttribute(attribute, value);
}
}
else
//如果element不为空，则preson下增加节点
{
XmlElement xe = doc.CreateElement(element);
if
(
string
.IsNullOrEmpty(attribute))
// <person><Num>88</Num></person> XMLHelper.Insert(path, "PersonF/person[@Name='Person2']","Num", "", "88");
xe.InnerText = value;
else
// <person> <Num ID="88" /></person> XMLHelper.Insert(path, "PersonF/person[@Name='Person2']", "", "ID", "88");
xe.SetAttribute(attribute, value);
xn.AppendChild(xe);
}
doc.Save(path);
}
catch
(Exception e)
{
Console.WriteLine(e.Message);
}
}
|
3、修改节点值
/// <summary>
/// 修改节点值
/// </summary>
/// <param name="path">路径</param>
/// <param name="node">要修改的节点</param>
/// <param name="attribute">属性名，非空时修改节点的属性值，否则修改节点值</param>
/// <param name="value">属性值</param>
/// 实例 XMLHelper.Update(path, "PersonF/person[@Name='Person3']/ID", "", "888");
/// XMLHelper.Update(path, "PersonF/person[@Name='Person3']/ID", "Num", "999");
public
static
void
Update(
string
path,
string
node,
string
attribute,
string
value)
{
try
{
XmlDocument doc =
new
XmlDocument();
doc.Load(path);
XmlNode xn = doc.SelectSingleNode(node);
XmlElement xe = (XmlElement)xn;
if
(
string
.IsNullOrEmpty(attribute))
xe.InnerText = value;
//原<ID>2</ID> 改变:<ID>888</ID> XMLHelper.Update(path, "PersonF/person[@Name='Person3']/ID", "", "888");
else
xe.SetAttribute(attribute, value);
//原<ID Num="3">888</ID> 改变<ID Num="999">888</ID> XMLHelper.Update(path, "PersonF/person[@Name='Person3']/ID", "Num", "999");
doc.Save(path);
}
catch
(Exception e)
{
Console.WriteLine(e.Message);
}
}
|
4、删除数据
/// <summary>
/// 删除数据
/// </summary>
/// <param name="path">路径</param>
/// <param name="node">要删除的节点</param>
/// <param name="attribute">属性，为空则删除整个节点，不为空则删除节点中的属性</param>
/// 实例：XMLHelper.Delete(path, "PersonF/person[@Name='Person3']/ID", "");
/// XMLHelper.Delete(path, "PersonF/person[@Name='Person3']/ID", "Num");
public
static
void
Delete(
string
path,
string
node,
string
attribute)
{
try
{
XmlDocument doc =
new
XmlDocument();
doc.Load(path);
XmlNode xn = doc.SelectSingleNode(node);
XmlElement xe = (XmlElement)xn;
if
(
string
.IsNullOrEmpty(attribute))
xn.ParentNode.RemoveChild(xn);
// <ID Num="999">888</ID>的整个节点将被移除 XMLHelper.Delete(path, "PersonF/person[@Name='Person3']/ID", "");
else
xe.RemoveAttribute(attribute);
//<ID Num="999">888</ID> 变为<ID>888</ID> XMLHelper.Delete(path, "PersonF/person[@Name='Person3']/ID", "Num");
doc.Save(path);
}
catch
(Exception e)
{
Console.WriteLine(e.Message);
}
}
|
5、调用方法
public
static
void
XMLMTest()
{
string
path =
"http://www.cnblogs.com/../Person.xml"
;
XMLHelper.Read(path,
"PersonF/person[@Name='Person2']"
,
"Name"
);
XMLHelper.Insert(path,
"PersonF/person[@Name='Person2']"
,
"Num"
,
"ID"
,
"88"
);
XMLHelper.Insert(path,
"PersonF/person[@Name='Person2']"
,
"Num"
,
""
,
"88"
);
XMLHelper.Insert(path,
"PersonF/person[@Name='Person2']"
,
""
,
"ID"
,
"88"
);
XMLHelper.Update(path,
"PersonF/person[@Name='Person3']"
,
"Num"
,
"888"
);
XMLHelper.Update(path,
"PersonF/person[@Name='Person3']/ID"
,
"Num"
,
"999"
);
XMLHelper.Update(path,
"PersonF/person[@Name='Person3']/ID"
,
""
,
"888"
);
XMLHelper.Delete(path,
"PersonF/person[@Name='Person3']/ID"
,
"Num"
);
XMLHelper.Delete(path,
"PersonF/person[@Name='Person3']/ID"
,
""
);
}
|
6、XML文件
<?xml version=
"1.0"
encoding=
"utf-8"
?>
<PersonF xmlns=
""
Name=
"work hard work smart!"
>
<person Name=
"Person1"
>
<ID>1</ID>
<Name>XiaoA</Name>
<Age>59</Age>
</person>
<person Name=
"Person2"
ID=
"88"
>
<ID>2</ID>
<Name>XiaoB</Name>
<Age>29</Age>
<Num ID=
"88"
/>
<Num>88</Num>
</person>
<person Name=
"Person3"
>
<ID Num=
"999"
>888</ID>
<Name>XiaoC</Name>
<Age>103</Age>
</person>
<person Name=
"Person4"
>
<ID>4</ID>
<Name>XiaoD</Name>
<Age>59</Age>
</person>
<person Name=
"Person5"
>
<Name>work hard work smart!</Name>
<ID>32</ID>
</person>
<person Name=
"Person5"
>
<Name>work hard work smart!</Name>
<ID>32</ID>
</person>
</PersonF>
|
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本文转自Work Hard Work Smart博客园博客，原文链接：http://www.cnblogs.com/linlf03/archive/2011/12/15/2288903.html，如需转载请自行联系原作者
