有客户问我，怎么拿到应用到WebPart上的Audiences。一想很简单，还不就是用AudienceManage通过Audience所对应的GUID来Get吗。谁知道一写才发现了问题，与某个WebPart对应的GUID去哪里找到呢？难道要去Query database？不信WebPart类有这么傻。

查了半天终于发现，WebPart的IsIncludedFilter属性包含了所有应用到WebPart上的Audiences的GUID，它们使用逗号分隔。知道了这个就简单了。

private void button1_Click(object sender, System.EventArgs e)
...{
    // Get PortalContext.
    TopologyManager tm = new TopologyManager();
    PortalSite ps = tm.PortalSites[new Uri("http://testsrv")];
    PortalContext pc = PortalApplication.GetContext(ps);
    
    // Get all WebParts.
    SPSite site = new SPSite("http://testsrv");
    SPWeb web = site.OpenWeb();
    SPWebPartCollection wpcollection = web.GetWebPartCollection("default.aspx", Storage.Shared);

    // Get all audiences for each webpart.
    AudienceManager am = new AudienceManager(pc);
    foreach(WebPart wp in wpcollection)
    ...{
        if(wp.IsIncludedFilter == string.Empty)
        ...{
            Debug.WriteLine("No Target Audience was selected for " + wp.Title);
        }
        else
        ...{
            // IsIncludedFilter contains a comma delimited list of audience GUID,
            // which format is "'guid1','guid2'"
            string[] GUIDs = wp.IsIncludedFilter.Split(',');

            foreach(string GUID in GUIDs)
            ...{
                Audience au = am.GetAudience(new Guid(GUID.Substring(1, GUID.Length - 2)));
                if(au != null)
                ...{
                    Debug.WriteLine("Target Audience, " + au.AudienceName + ", was selected for " + wp.Title);
                    ArrayList membership = au.GetMembership();
                    if(membership != null)
                    ...{
                        for(int i = 0; i < membership.Count; i++)
                        ...{
                            Debug.WriteLine("  --" + ((UserInfo)membership[i]).PreferredName);
                            Debug.WriteLine("  --" + ((UserInfo)membership[i]).Email);
                            Debug.WriteLine("  --" + ((UserInfo)membership[i]).NTName);
                        }
                    }
                }
            }
        }
    }
}