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續上篇：http://www.dotblogs.com.tw/yc421206/archive/2014/06/03/145354.aspx

本文章節：

前置作業，開啟清單版本控制

下載最新版本檔案：

下載特定版本檔案：

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前置作業，開啟清單版本控制

 

 

下載最新版本檔案：

當清單裡面有一個檔案，可按下列步驟來下載檔案

1. 搜尋檔案，var file = list.RootFolder.Files.GetByUrl("demo.docx")並取
2. 得檔案路徑 file.ServerRelativeUrl
3. 開啟檔案 Microsoft.SharePoint.Client.File.OpenBinaryDirect ，取得 Stream。
4. 存檔。

程式碼如下：

{
    using (ClientContext client = new ClientContext("http://sps2013/CsomApi"))
    {
        client.Credentials = new NetworkCredential("your account", "your password");
        var site = client.Web;
        var list = site.Lists.GetByTitle("Documents");
        var file = list.RootFolder.Files.GetByUrl("demo.docx");

        client.Load(file);
        client.ExecuteQuery();

        var fileInfo = Microsoft.SharePoint.Client.File.OpenBinaryDirect(client, file.ServerRelativeUrl);

        byte[] readbuffer = null;
        using (var memory = new MemoryStream())
        {
            while (true)
            {
                byte[] buffer = new byte[1024];
                var length = fileInfo.Stream.Read(buffer, 0, buffer.Length);
                if (length <= 0)
                {
                    break;
                }
                memory.Write(buffer, 0, length);
            }

            memory.Seek(0, SeekOrigin.Begin);
            readbuffer = memory.ToArray();
        }
        var targetStream = new FileStream("demo-1.docx", FileMode.Create, FileAccess.Write);
        targetStream.Write(readbuffer, 0, readbuffer.Length);
        targetStream.Dispose();
        fileInfo.Dispose();
    }
}

 

 

下載特定版本檔案：

欲想下載特殊版本，可按下列步驟來下載檔案

1. 取得檔案 Versions，這裡會記錄舊的版本訊息，我會需要它的 Url 屬性
2. 我找不到下載特殊版本的操作物件，所以先取得檔案路徑後，再用 HttpWebRequest 下載檔案，同樣可以達到下載特定版本的效果

程式碼如下：

{
    using (ClientContext client = new ClientContext("http://sps2013/CsomApi"))
    {
        client.Credentials = new NetworkCredential("your account", "your password");

        var site = client.Web;
        var list = site.Lists.GetByTitle("Documents");
        var file = list.RootFolder.Files.GetByUrl("demo.docx");

        var versions = file.Versions;
        client.Load(versions);
        client.ExecuteQuery();

        var findVersion = versions.FirstOrDefault(o => o.VersionLabel == "1.0");
        string url = client.Url + @"/" + findVersion.Url;

        HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(url);
        httpRequest.Credentials = new NetworkCredential("your account", "your password");
        HttpWebResponse httpResponse = (HttpWebResponse)httpRequest.GetResponse();
        Stream sourceStream = httpResponse.GetResponseStream();

        byte[] buffer = new byte[8 * 1024];
        FileStream targetStream = new FileStream("demo-1.docx", FileMode.Create, FileAccess.Write);
        int size = 0;

        do
        {
            size = sourceStream.Read(buffer, 0, buffer.Length);
            if (size > 0)

                targetStream.Write(buffer, 0, size);
        } while (size > 0);

        targetStream.Close();
        httpResponse.Close();
    }
}

版本歷程訊息如下圖：

 

 

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本文出自：http://www.dotblogs.com.tw/yc421206/archive/2014/06/03/145357.aspx

 

 

 

 

 

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