[c#]获取exchange中的图片

阿斯顿阿斯顿

摘要
　　在exchange 2007或者2010中获取的邮件内容为html标签格式，也就是一个页面。如果里面含有img标签，你会发现img标签的src属性为cid:xxxxxxxxxxxx的一串字符串，并不是url，这时候就造成页面上图片显示不出来。

解决办法
　　在网上找了一种解决办法。
　　原文地址：http://stackoverflow.com/questions/6650842/ews-exchange-2007-retrieve-inline-images
　　首先创建cid的索引



private const string CidPattern = "cid:";
private static HashSet<int> BuildCidIndex(string html)
{
var index = new HashSet<int>();
var pos = html.IndexOf(CidPattern, 0);
while (pos > 0)
{
var start = pos + CidPattern.Length;
index.Add(start);
pos = html.IndexOf(CidPattern, start);
}
return index;
}      
　　在索引的基础上封装一个替换的方法



private static void AdjustIndex(HashSet<int> index, int oldPos, int byHowMuch)
{
var oldIndex = new List<int>(index);
index.Clear();
foreach (var pos in oldIndex)
{
if (pos < oldPos)
index.Add(pos);
else
index.Add(pos + byHowMuch);
}           
}
private static bool ReplaceCid(HashSet<int> index, ref string html, string cid, string path)
{
var posToRemove = -1;
foreach (var pos in index)
{
if (pos + cid.Length < html.Length && html.Substring(pos, cid.Length) == cid)
{
var sb = new StringBuilder();
sb.Append(html.Substring(0, pos-CidPattern.Length));
sb.Append(path);
sb.Append(html.Substring(pos + cid.Length));
html = sb.ToString();
posToRemove = pos;
break;
}
}
if (posToRemove < 0)
return false;
index.Remove(posToRemove);
AdjustIndex(index, posToRemove, path.Length - (CidPattern.Length + cid.Length));
return true;
}
　　在获取的item中获取附件



FileAttachment[] attachments = null;
var index = BuildCidIndex(sHTMLCOntent);
if (index.Count > 0 && item.Attachments.Count > 0)
{
var basePath = Directory.GetCurrentDirectory();
attachments = new FileAttachment[item.Attachments.Count];
for (var i = 0; i < item.Attachments.Count; ++i)
{
var type = item.Attachments.ContentType.ToLower();
if (!type.StartsWith("image/")) continue;                    
type = type.Replace("image/", "");
var attachment = (FileAttachment)item.Attachments;
var cid = attachment.ContentId;
var filename = cid + "." + type;
var path = Path.Combine(basePath, filename);
if(ReplaceCid(index, ref sHTMLCOntent, cid, path))
{
// only load images when they have been found         
         attachment.Load(path);
attachments = attachment;
}
}
}