小编use*_*160的帖子

我使用以下代码来创建XML文件:

XmlWriterSettings xmlWriterSettings = new XmlWriterSettings();
xmlWriterSettings.Indent = true;
xmlWriterSettings.NewLineOnAttributes = true;
using (XmlWriter xmlWriter = XmlWriter.Create("Test.xml", xmlWriterSettings))
{
   xmlWriter.WriteStartDocument();
   xmlWriter.WriteStartElement("School");
   xmlWriter.WriteEndElement();
   xmlWriter.WriteEndDocument();
   xmlWriter.Close();
 }

我需要动态插入节点,创建以下结构:

<?xml version="1.0" encoding="utf-8"?>
<School />
   <Student>
      <FirstName>David</FirstName>
      <LastName>Smith</LastName>
   </Student>
   ...
   <Teacher>
      <FirstName>David</FirstName>
      <LastName>Smith</LastName>
   </Teacher>
   ...
</School>

我该怎么做？应从键盘读取"FirstName"和"LastName"的值,并且可以随时输入值,当然在现有值下.

如何将 a 保存DataTable到文件中。accdb (Access) 现有一个吗？我使用了以下代码，但它不起作用：

using (OleDbConnection oledbConnection = new OleDbConnection(connection))
{
   oledbConnection.Open();
   string query = "SELECT * FROM Student";
   using (OleDbCommand oledbCommand = new OleDbCommand(query, oledbConnection))
   {
      using (OleDbDataAdapter oledbDataAdapter = new OleDbDataAdapter(oledbCommand))
      {
         using (OleDbCommandBuilder oledbCommandBuilder = new OleDbCommandBuilder(oledbDataAdapter))
         {
            oledbDataAdapter.DeleteCommand = oledbCommandBuilder.GetDeleteCommand(true);
            oledbDataAdapter.InsertCommand = oledbCommandBuilder.GetInsertCommand(true);
            oledbDataAdapter.UpdateCommand = oledbCommandBuilder.GetUpdateCommand(true);
            oledbDataAdapter.Update(dataTable);
         }
      }
   }
   oledbConnection.Close();
}

变量 dataTable 使用文件的原始内容进行初始化，然后通过添加一行进行修改，现在我必须更新数据库中的表。

我尝试使用以下代码，但这不起作用:(

OleDbDataAdapter da = new OleDbDataAdapter("SELECT * FROM Student", connection);
OleDbCommandBuilder cmdBuilder = new OleDbCommandBuilder(da);
da.InsertCommand = cmdBuilder.GetInsertCommand(true); …