问题

Question

问题

如何阅读特定版本的文件内容？

我尝试了什么

我试过了：
```
var webClient = new WebClient() {Credentials = Context.Credentials })
webClient.DownloadString($"{Context.Url}{fileVersion.Url}");
```
但Credentials为空。我也试过UseDefaultCredential = true，但在这两种情况下我都禁止403：

System.Net.WebException：＆＃39;远程服务器返回错误：（403）Forbidden。＆＃39;

我也尝试过：

File.OpenBinaryDirect(sharepoint.Context, fileVersion.Url)
//fileVersion.Url == "_vti_history/512/ListName/filename.xml"

> Specified argument was out of the range of valid values.
> Parameter name: serverRelativeUrl

并以/开头：
```
 File.OpenBinaryDirect(sharepoint.Context, "/" + fileVersion.Url)
```
System.Net.WebException：＆＃39;远程服务器返回错误：（404）Not Found。＆＃39;

如何创建ClientContext：

我使用sharepoint PnP来创建和验证我的ClientContext：

var authentication = new OfficeDevPnP.Core.AuthenticationManager();
Context = authentication.GetWebLoginClientContext(siteUrl);

我能够检索FileVersion列表：

var items = list.GetItems(camlQuery);
Context.Load(items);
Context.ExecuteQuery();
foreach (ListItem item in items)
{
    sharepoint.Context.Load(item.Versions);
    sharepoint.Context.Load(item.File.Versions);
    sharepoint.Context.Load(item.File);

    sharepoint.Context.ExecuteQuery();

    foreach (var fileVersion in item.File.Versions)
    {
         ReadFile(fileVersion);
    }
}

这是我的库的版本：

<package id="Microsoft.SharePointOnline.CSOM" version="16.1.7018.1200" targetFramework="net461" />
<package id="SharePointPnP.IdentityModel.Extensions" version="1.2.2" targetFramework="net461" />
<package id="SharePointPnPCoreOnline" version="2.19.1710.2" targetFramework="net461" />

Answer 1

我通过从ClientContext窃取cookie来攻击webclient身份验证：

var authentication = new OfficeDevPnP.Core.AuthenticationManager();
context = authentication.GetWebLoginClientContext(siteUrl);
webClient = new WebClient();
context.ExecutingWebRequest += StealCookieOnExecutingWebRequest;
void StealCookieOnExecutingWebRequest(object sender, WebRequestEventArgs e)
{
    var cookies = e.WebRequestExecutor.WebRequest.CookieContainer;
    webClient.Headers[HttpRequestHeader.Cookie] = cookies.GetCookieHeader(new Uri(SiteUrl));
    context.ExecutingWebRequest -= StealCookieOnExecutingWebRequest;
}

我不会将此标记为答案，因为可能有更好的解决方案。

如何使用CSOM从Sharepoint Online下载FileVersion内容

问题

我尝试了什么

如何创建ClientContext：

1 个答案: