<分区>
我正在编写一个控制台程序。我得到了可以工作的代码，但我想将其更改为通用函数以启用使用不同的 Stream 源(例如 MemoryStream)。
这是我的程序:
private static void Main(string[] args)
{
using (var fs = new FileStream("f:\\!temp\\marcXmlRecords.mxml", FileMode.Open))
{
var reader = new MarcXmlReader().Read(fs);
foreach (var record in reader)
{
var leader = record.Leader;
var controlFields = record.GetControlFields();
var dataFields = record.GetDataFields();
var allFields = record.GetVariableFields();
using (var fs2 = new FileStream("f:\\!temp\\marcRecords.mrc",
FileMode.OpenOrCreate))
{
using (var writer = new MarcStreamWriter(fs2, "UTF-8"))
{
var wrecord = MarcFactory.Instance.NewRecord();
wrecord.Leader = record.Leader;
foreach (var cfield in controlFields)
{
wrecord.AddVariableField(cfield);
}
foreach (var dfield in dataFields)
{
wrecord.AddVariableField(dfield);
}
foreach (var afield in allFields)
{
wrecord.AddVariableField(afield);
}
writer.Write(wrecord);
}
}
}
}
}
好的，工作正常。现在让我们让它更通用:
internal class Program
{
private static void Main(string[] args)
{
using (var fs = new FileStream("f:\\!temp\\marcXmlRecords.mxml", FileMode.Open))
{
using (var fs2 = new FileStream("f:\\!temp\\marcRecords.mrc",
FileMode.OpenOrCreate))
{
ConvertXmlMarcToMarc(fs, fs2);
}
}
}
private static void ConvertXmlMarcToMarc(Stream fin, Stream fout)
{
var reader = new MarcXmlReader().Read(fin);
foreach (var record in reader)
{
var leader = record.Leader;
var controlFields = record.GetControlFields();
var dataFields = record.GetDataFields();
var allFields = record.GetVariableFields();
using (var writer = new MarcStreamWriter(fout, "UTF-8"))
{
var wrecord = MarcFactory.Instance.NewRecord();
wrecord.Leader = record.Leader;
foreach (var cfield in controlFields)
{
wrecord.AddVariableField(cfield);
}
foreach (var dfield in dataFields)
{
wrecord.AddVariableField(dfield);
}
foreach (var afield in allFields)
{
wrecord.AddVariableField(afield);
}
writer.Write(wrecord);
}
}
}
}
但我在行中遇到异常:using (var writer = new MarcStreamWriter(fs2, "UTF-8")):
An unhandled exception of type 'System.ArgumentException' occurred in mscorlib.dll
Additional information: Stream was not writable.
堆栈跟踪
at System.IO.BinaryWriter..ctor(Stream output, Encoding encoding, Boolean leaveOpen)
at MARC4J.Net.MarcStreamWriter..ctor(Stream output, String encoding, Boolean allowOversizeRecord)
at MARC4J.Net.MarcStreamWriter..ctor(Stream output, String encoding)
at SummonImport.Program.ConvertXmlMarcToMarc(Stream fin, Stream fout) in F:!!LocalRepository\Libraries_Apps\SummonImport\trunk\release\SummonImport\SummonImport\Program.cs:line 35
at SummonImport.Program.Main(String[] args) in F:!!LocalRepository\Libraries_Apps\SummonImport\trunk\release\SummonImport\SummonImport\Program.cs:line 20
at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()