如何在 C# 中使用 SharePoint Online 2013 Rest API 删除列表项

How to delete list item using SharePoint Online 2013 Rest API in C#

我正在尝试使用带有 C# 托管代码的 REST API 从 SharePoint 2013 Online 中删除列表项。

这是我的代码的本质:

using (var client = new WebClient())
{
    client.Headers.Add("X-FORMS_BASED_AUTH_ACCEPTED", "f");
    client.Credentials = mySPCreds;

    client.Headers.Add(HttpRequestHeader.ContentType, "application/json;odata=verbose");
    client.Headers.Add(HttpRequestHeader.Accept, "application/json;odata=verbose");

    client.Headers.Add("X-HTTP-Method", "DELETE");
    client.Headers.Add("IF-MATCH", "*");

    var requestUri = new Uri("https://mysharepointsite.../_api/web/lists/getbytitle('MyList')/items(123)");

    client.UploadString(requestUri, String.Empty);
}

我收到 403 权限被拒绝,但使用类似的模式我能够创建列表项。我将我的凭据用于 WebClient,它是一个 SharePointOnlineCredentials 对象。我是 SharePoint 站点管理员。

所以,我想知道我是否只是 syntax/approach 错了。如果我没有权限问题,有人可以验证我上面的代码 "should" 是否有效吗?

好的,我找到了解决方案:

客户端headers需要包含表格摘要:

client.Headers.Add("X-RequestDigest", GetFormDigest());

要获取表单摘要,您可以使用此代码:

    private string GetFormDigest()
    {
        var webClient = new WebClient();
        webClient.Headers.Add("X-FORMS_BASED_AUTH_ACCEPTED", "f");
        webClient.Credentials = this.Credentials;
        webClient.Headers.Add(HttpRequestHeader.ContentType, String.Format("application/json;odata=nometadata"));
        webClient.Headers.Add(HttpRequestHeader.Accept, String.Format("application/json;odata=nometadata"));

        var uri = new Uri(this.SharepointBaseURL);
        var endpointUri = new Uri(uri, "_api/contextinfo");
        var result = webClient.UploadString(endpointUri, "POST");
        JToken t = JToken.Parse(result);

        //Use this if odata = nometadata
        return t["FormDigestValue"].ToString();

        //Use this if odata = verbose
        //return t["d"]["GetContextWebInformation"]["FormDigestValue"].ToString();
    }

注意:凭据也很棘手,这是相关代码:

        var securePassword = new SecureString();
        foreach (var c in myPassword)
        {
            securePassword.AppendChar(c);
        }

        this.Credentials = new SharePointOnlineCredentials(myUserName, securePassword);