C#.net 格式化输出XML文档字符串

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/// <summary>
/// 返回经过格式化处理的xml文档
/// </summary>
/// <param name="doc">xml文档对象</param>
/// <returns></returns>
public static string GetFormatXml(XmlDocument doc)
{
string result = null;
if (doc != null)
{
try
{
MemoryStream mstream = new MemoryStream(1024);
XmlTextWriter writer = new XmlTextWriter(mstream, null);
writer.Formatting = Formatting.Indented;//微软提供的
doc.WriteTo(writer);
writer.Flush();
writer.Close();

Encoding encoding = Encoding.GetEncoding("utf-8");
result = encoding.GetString(mstream.ToArray());
mstream.Close();
}
catch
{

//只能实现换行
result = doc.OuterXml.Replace(">/r/n", ">").Replace(">", ">/r/n");
}
}
return result;
}