[英]Save and Load twice DataTable in one XML file and load it
I have a problem to save 2x Datatable into 1 xml file. 我在将2x数据表保存到1个xml文件时遇到问题。
Im using c# .Net 4.6 + 我正在使用C#.Net 4.6 +
DataTable dt = (DataTable)dataGridView1.DataSource;
DataTable dt1 = (DataTable)dataGridView2.DataSource;
SaveFileDialog sfd = new SaveFileDialog();
sfd.Filter = "XML|*.xml";
if (sfd.ShowDialog() == DialogResult.OK)
{
try
{
dt.WriteXml(sfd.FileName);
dt1.WriteXml(sfd.FileName);
}
catch (Exception ex)
{
//Console.WriteLine(ex);
}
}
For loading data im using : 使用以下命令加载即时消息:
OpenFileDialog sfd = new OpenFileDialog();
sfd.Filter = "XML|*.xml";
if (sfd.ShowDialog() == DialogResult.OK)
{
string file = sfd.FileName;
try
{
dt.ReadXml(file);
dt1.ReadXml(file);
}
catch (Exception ex)
{
//Console.WriteLine(ex);
}
}
I want to save dt and dt1 to xml file then load it by 1 xml file. 我想将dt和dt1保存到xml文件,然后通过1个xml文件加载它。
How can i save it? 我该如何保存? When i use my code above then dt1 overwrites dt. 当我使用上面的代码时,dt1会覆盖dt。
You can as an example , start by using the XmlDocument class to create your custom XML in conjuection with a TextWriter 您可以作为示例,首先使用XmlDocument类与TextWriter结合创建自定义XML。
TextWriter writer = null;
try
{
XmlDocument doc = new XmlDocument();
//xml decleration
var xmlDecleration = doc.CreateXmlDeclaration("1.0", "UTF-8", "yes");
doc.AppendChild(xmlDecleration);
//create the
XmlElement rootElement = doc.CreateElement("datatableTopLevelElement");//, HierachyFileConstants.EXPORT_NAMESPACE);//the root element
XmlAttribute versionAttribute = doc.CreateAttribute("someVersionAttribute");
versionAttribute.Value = Version;//set the version number
rootElement.Attributes.Append(versionAttribute);
doc.AppendChild(rootElement);
XmlElement dataObjectType = doc.CreateElement("FirstDataTable");//element name
using (var ms = new MemoryStream())
{
var serializer = new XmlSerializer(dataType.GetType());//datatable type(if you know it)
XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
ns.Add("", "");
writer = new StreamWriter(ms);
serializer.Serialize(writer, dataType, ns);
//for some reason using xmlSettings with UTF-8 encoding creates an extra unecessary character
//remove first line of xml file
var xmlData = string.Join(Environment.NewLine, Encoding.UTF8.GetString(ms.ToArray())
.Split(Environment.NewLine.ToCharArray())
.Skip(1)
.ToArray());
var xmlElement = GetElement(xmlData);
dataObjectType.AppendChild(dataObjectType.OwnerDocument.ImportNode(xmlElement, true));
}
//end of first datatable -- repeat from first datable method to add second datatable(
}
}
}
//var tes
//return new XmlDocument().LoadXml(doc.OuterXml.Replace("xmlns=\"" + string.Empty + "\"",string.Empty));
var docToReturn = new XmlDocument();
docToReturn.LoadXml(doc.OuterXml.Replace("xmlns=\"" + string.Empty +
"\"", string.Empty));
return docToReturn;
}
The GetElement method looks like this
private XmlElement GetElement(string xml)
{
XmlDocument doc = new XmlDocument();
doc.LoadXml(xml);
doc.DocumentElement.Attributes.RemoveNamedItem("xmlns");
//doc.DocumentElement.NamespaceURI
return doc.DocumentElement;
}
Just after adding the first datatable - add the second datatable to add the it to the xml, or create a List of your datatable and do a foreach statement to make it simpler 在添加第一个数据表之后-添加第二个数据表以将其添加到xml,或创建数据表的列表并执行foreach语句以使其更简单
As i said in comment. 正如我在评论中所说。 The best and the easier way is to datatables add in datasets. 最好,最简单的方法是将数据表添加到数据集中。
Datasets merge in 1 by code : 数据集按以下代码合并为1:
DataTable dt = (DataTable)dataGridView1.DataSource;
DataSet ds = new DataSet();
DataSet ds1 = new DataSet();
ds.Tables.Add(dt);
ds1.Tables.Add(dt1);
DataTable dt1 = (DataTable)dataGridView2.DataSource;
SaveFileDialog sfd = new SaveFileDialog();
sfd.Filter = "XML|*.xml";
if (sfd.ShowDialog() == DialogResult.OK)
{
try
{
ds.Merge(ds1);
ds.WriteXml(sfd.FileName);
//dt1.WriteXml(sfd.FileName);
}
catch (Exception ex)
{
//Console.WriteLine(ex);
}
}
And then load it like this : 然后像这样加载它:
OpenFileDialog sfd = new OpenFileDialog();
sfd.Filter = "XML|*.xml";
if (sfd.ShowDialog() == DialogResult.OK)
{
string file = sfd.FileName;
try
{
dt.ReadXml(file);
dt1.ReadXml(file);
}
catch (Exception ex)
{
//Console.WriteLine(ex);
}
}
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