通过CSOM检索所有重复事件的实例

时间:2015-02-06 20:06:55

标签: c# rest sharepoint-2013 sharepoint-api sharepoint-online

我需要通过CSOM在线获取Sharepoint 2013中的定期日历事件的所有实例。我读到它无法完成,我需要直接通过REST API来完成。

我的问题:

1)是否可以从View而不是List中获取项目,因为日历附带一个默认视图,我可以在其中看到周期性事件的所有实例

2)我有一个通过REST un C#检索数据的例子工作正常,但我似乎无法向它添加一个Caml查询(在C#中) 这是我的非工作代码:

HttpWebRequest itemRequest =
                (HttpWebRequest)HttpWebRequest.Create(sharepointUrl.ToString() + "/_api/Web/lists/getbytitle('" + listName + "')/Items");
            itemRequest.Method = "POST";
            itemRequest.Accept = "application/atom+xml";
            itemRequest.ContentType = "application/atom+xml;type=entry";
            itemRequest.Headers.Add("Authorization", "Bearer " + accessToken);
            using (var writer = new StreamWriter(itemRequest.GetRequestStream()))
            {
                writer.Write(@"{ 'query' : {'__metadata': { 'type': 'SP.CamlQuery' }, 'ViewXml': '<View><Query><Where><Eq><FieldRef Name='Title'/><Value Type='Text'>little test</Value></Eq></Where></Query></View>' } }");
            }

            HttpWebResponse itemResponse = (HttpWebResponse)itemRequest.GetResponse();

我收到500内部服务器错误

有什么想法? 谢谢

2 个答案:

答案 0 :(得分:1)

我建议使用Fiddler来检查REST SharePoint RESTfull Web服务请求。

在您的情况下,端点不正确。由于您需要通过CAML查询请求列表项,请将端点URL替换为:

/_api/Web/lists/getbytitle('" + listName + "')/Items

到这一个:

/_api/Web/lists/getbytitle('" + listName + "')/getitems

其次,POST请求中不支持application/atom+xml;type=entry HTTP Content-Type标头(请参阅下面支持的MIME类型列表)。所以,替换行:

itemRequest.Accept = "application/atom+xml";
itemRequest.ContentType = "application/atom+xml;type=entry";

例如,有这些:

itemRequest.Accept = "application/json";
itemRequest.ContentType = "application/json";

就是这样。

支持的MIME类型列表

  • 应用/ JSON;的OData = minimalmetadata;流=真
  • 应用/ JSON;的OData = minimalmetadata;流=假
  • 应用/ JSON;的OData = minimalmetadata
  • 应用/ JSON;的OData = fullmetadata;流=真
  • 应用/ JSON;的OData = fullmetadata;流=假
  • 应用/ JSON;的OData = fullmetadata
  • 应用/ JSON;的OData = nometadata;流=真
  • 应用/ JSON;的OData = nometadata;流=假
  • 应用/ JSON;的OData = nometadata
  • 应用/ JSON;流=真
  • 应用/ JSON;流=假
  • 应用/ JSON;的OData =详细
  • 应用/ JSON

您还可以使用以下类来执行REST请求:

public class SPRestExecutor
{

    public SPRestExecutor(Uri webUri,string accessToken)
    {
        WebUri = webUri;
        AccessToken = accessToken;
    }



    public JObject ExecuteJsonWithDigest(string endpointUrl, HttpMethod method, IDictionary<string, string> headers, JObject payload)
    {
        var formDigestValue = RequestFormDigest();
        var finalHeaders = new Dictionary<string, string>();
        if (headers != null)
        {
            foreach (var key in headers.Keys)
            {
                finalHeaders.Add(key, headers[key]);
            }
        }
        finalHeaders.Add("X-RequestDigest", formDigestValue);

        var result = ExecuteJson(endpointUrl, method, finalHeaders, payload);
        return result;
    }


    public JObject ExecuteJson(string endpointUrl, HttpMethod method, IDictionary<string, string> headers, JObject payload)
    {
        var request = (HttpWebRequest)WebRequest.Create(WebUri.ToString() + endpointUrl);
        request.Headers.Add(HttpRequestHeader.Authorization, "Bearer " + AccessToken);
        request.Method = method.Method;
        request.Accept = "application/json;odata=verbose";
        request.ContentType = "application/json;odata=verbose";
        if (payload != null)
        {
            using (var writer = new StreamWriter(request.GetRequestStream()))
            {
                writer.Write(payload);
                writer.Flush();
            }
        }
        using (var response = (HttpWebResponse)request.GetResponse())
        {
            using(var responseStream = response.GetResponseStream())
            {
                using (var reader = new StreamReader(responseStream))
                {
                    var result = reader.ReadToEnd();
                    return JObject.Parse(result);
                }
            }
        }
    }


    /// <summary>
    /// Request Form Digest
    /// </summary>
    /// <returns></returns>
    protected string RequestFormDigest()
    {
        var result = ExecuteJson("/_api/contextinfo", HttpMethod.Post, null, null);
        return result["d"]["GetContextWebInformation"]["FormDigestValue"].ToString();
    }


    public string AccessToken { get; private set; }


    public Uri WebUri { get; private set; }
}

Gist

用法

var client = new SPRestExecutor(webUri,accessToken);
var payload = JObject.Parse(@"{ 'query' : {'__metadata': { 'type': 'SP.CamlQuery' }, 'ViewXml': '<View><Query/></View>' } }");
var data = client.ExecuteJson("/_api/web/lists/getbytitle('Documents')/getitems", HttpMethod.Post, null, payload);

答案 1 :(得分:0)

谢谢Vadim Gremyachev,你的帖子让我走上正轨。

我有3个问题,第一个问题是&#34; Items&#34;代替&#34; getItems&#34;,第二个使用&#34; application / atom + xml; type = entry&#34;作为ContentType(正如Vadim所述)。

第三个也是最后一个问题是在整个查询中使用简单的引号。在ViewXml中,我使用了scaped双引号,因此它们不会与关闭ViewXml元素的那个混淆。

所以,工作代码最终是这样的:

byte[] data = new ASCIIEncoding().GetBytes("{ 'query' : {'__metadata': { 'type': 'SP.CamlQuery' }, 'ViewXml': '<View><Query><Where><Eq><FieldRef Name=\"Title\"/><Value Type=\"Text\">little test</Value></Eq></Where></Query></View>' } }");

        HttpWebRequest itemRequest =
            (HttpWebRequest)HttpWebRequest.Create(sharepointUrl.ToString() + "/_api/Web/lists/getbytitle('" + listName + "')/getitems");
        itemRequest.Method = "POST";
        itemRequest.ContentType = "application/json; odata=verbose";
        itemRequest.Accept = "application/atom+xml";
        itemRequest.Headers.Add("Authorization", "Bearer " + accessToken);

        itemRequest.ContentLength = data.Length;
        Stream myStream = itemRequest.GetRequestStream();
        myStream.Write(data, 0, data.Length);
        myStream.Close();         

        HttpWebResponse itemResponse = (HttpWebResponse)itemRequest.GetResponse();