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我试图读取多个XML文件中的数据,但遇到以下情况除外:ADO.NET - 错误读取多个XML文件
“意外的XML声明XML声明必须在第一个节点。文件,并且不允许在它之前出现空格字符 11895行,位置3。
在这种情况下,我试图在循环中读取3个文件。如果每个文件都是单独读取的,它可以正常工作。只有在循环中连续读取文件时,读取第二个文件时发生异常。在上面的例外中,file1有11895行,所以当读取file2时,它会引发'11895行意外的XML声明',因为每个文件都有自己的XML声明。
我的问题是:如果一个新的DataSet和MemoryStream对象被用来读取每个文件,那么为什么不允许第二个和第三个文件具有XML声明头文件?我如何让每个阅读独立于早期阅读?
这里是我的代码:
//Open the database connection
using (SqlConnection cn = new SqlConnection(Properties.Settings.Default.ApplicationServices))
{
cn.Open();
// Begin a new transaction
using (SqlTransaction tr = cn.BeginTransaction())
{
try
{
//Loop through each attachment, convert the attachment xml to DataTable and Load into the Database
foreach (Attachment att in message.Attachments)
{
LogMessage(string.Format("Reading Attachment: {0}", att.Name), 0);
// Load the Contents of the attachment into a MemoryStream
using (MemoryStream ms = new MemoryStream(att.Content, true))
{
ms.Seek(0, System.IO.SeekOrigin.Begin);
//Use a dataset to automatically determine the schema from the XML file
using (DataSet ds = new DataSet())
{
//Load the MemoryStream contents into a DataSet, that automatically determines the schema
try
{
ds.ReadXml(ms);
ms.Dispose();
}
catch (Exception ex)
{
LogMessage(string.Format("Error reading xml {0}. {1}{2}", att.Name, ex.Message, ex.StackTrace), 2);
throw ex;
}
LogMessage(string.Format("Found {0} records", ds.Tables[0].Rows.Count), 0);
/*Other business logic to process data in the ds.Tables[0] ... */
}
}
}
//Commit transaction if everything worked out fine
LogMessage("Card product import complete, committing transaction", 0);
tr.Commit();
}
catch (Exception ex)
{
LogMessage("Error Occured during card product import, rolling back transaction", 2);
tr.Rollback();
throw ex;
}
}
cn.Close();
}
我试过XmlDocument.Parse(MemoryStream),但也有同样的问题! – Nishant