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[英]C# streamwriter denies access to save xml file into MyDocuments
[英]save xml file using streamwriter
我正在尝试找到一种将数据保存回编码为“ iso-8859-7”的xml文件的方法。
首先我使用加载XML
public XmlDocument LoadDocument(String x)
{
XmlDocument document = new XmlDocument();
StreamReader stream = new StreamReader(xml, Encoding.GetEncoding("iso-8859-7"));
document.Load(stream);
return (document);
}
将属性加载到表单控件中,然后单击“保存”按钮
private void savebtn_Click(object sender, EventArgs e)
{
XmlNodeList attributes = commonMethods.LoadDocument(xml).DocumentElement.SelectNodes("//Class[@Name='" + classname + "']/Property[@Id='" + id + "']/attribute::*");
for (int x = 0; x < attributes.Count; )
{
foreach (Control ctr in table1.Controls)
{
if (ctr is TextBox)
{
if (ctr.Text == attributes[x].Value.ToString()) { x++; }
else
{
attributes[x].Value = ctr.Text; commonMethods.SaveDocument(xml);
x++;
}
}
else if (ctr is ComboBox)
{
if (((ComboBox)ctr).Text == attributes[x].Value) { x++; }
else
{
attributes[x].Value = ((ComboBox)ctr).Text; commonMethods.SaveDocument(xml);
x++;
}
}
}
}
}
它将更改保存回xml文件。 我曾经保存它而不使用像xmldoc.Save("sample.xml)
这样的xmlwriter xmldoc.Save("sample.xml)
但是由于文件中有些字符,我不得不使用类似的方法。
public XmlDocument SaveDocument(String x)
{
XmlDocument document = new XmlDocument();
StreamWriter stream = new StreamWriter(x,false,Encoding.GetEncoding("iso-8859-7"));
document.Save(xml);
return (document);
}
问题是当我编译时说“ xml被另一个进程使用”并且失败。
System.IO.IOException
之所以会出现此异常,是因为StreamReader仍在打开文件,而该文件正等待完成(垃圾回收)。 您应该始终处置流(和读取器/写入器)以尽快释放文件句柄。
public XmlDocument LoadDocument(String path)
{
XmlDocument document = new XmlDocument();
using (StreamReader stream = new StreamReader(path, Encoding.GetEncoding("iso-8859-7")))
{
document.Load(stream);
}
return (document);
}
public XmlDocument SaveDocument(XmlDocument document, String path)
{
using (StreamWriter stream = new StreamWriter(path,false,Encoding.GetEncoding("iso-8859-7")))
{
document.Save(stream);
}
return (document);
}
private void savebtn_Click(object sender, EventArgs e)
{
var doc = commonMethods.LoadDocument(xml);
XmlNodeList attributes = doc.DocumentElement.SelectNodes("//Class[@Name='" + classname + "']/Property[@Id='" + id + "']/attribute::*");
for (int x = 0; x < attributes.Count; )
{
foreach (Control ctr in table1.Controls)
{
if (ctr is TextBox)
{
if (ctr.Text == attributes[x].Value.ToString()) { x++; }
else
{
attributes[x].Value = ctr.Text; commonMethods.SaveDocument(doc, xml);
x++;
}
}
else if (ctr is ComboBox)
{
if (((ComboBox)ctr).Text == attributes[x].Value) { x++; }
else
{
attributes[x].Value = ((ComboBox)ctr).Text; commonMethods.SaveDocument(doc, xml);
x++;
}
}
}
}
}
您在加载文档后没有处置 StreamReader
对象
添加using
语句:
public XmlDocument LoadDocument(String x)
{
XmlDocument document = new XmlDocument();
using (StreamReader stream = new StreamReader(xml, Encoding.GetEncoding("iso-8859-7")))
{
document.Load(stream);
}
return (document);
}
参考: http : //msdn.microsoft.com/zh-cn/library/system.io.streamreader(v=vs.110).aspx
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