SharePoint 2010开发实例精选——通过客户端对象模型上传下载文件

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　　为了使用ClientContext，我们需要添加两个dll引用到我们的项目中。Microsoft.SharePoint.Client.dll和Microsoft.SharePoint.Client.Runtime.dll。在本博文中，我们将学习如何：

• 从SharePoint文档库中通过CAML获取ListItemCollection
  
• 上载一个文档到SharePoint 文档库
  
• 从SharePoint文档库下载一个文档
  

从SharePoint文档库中通过CAML获取ListItemCollection
　　我们可以像下面这样获取ListItemCollection：



ListItemCollection listItems = GetListItemCollectionFromSP("FileLeafRef", documentName, "Text", 1);

　　GetListItemCollectionFormSP方法可以用来获取列表项，其中第一个参数Name - 为FieldRef的名称，第二个参数value=FieldRef的值，第三个参数type - 是值的类型，最后一个参数rowLimit - 是返回最多多少条记录。



        private static ListItemCollection GetListItemCollectionFromSP(string name, string value, string type, int rowLimit)
{
ListItemCollection listItems = null;
using (ClientContext clientContext = new ClientContext(siteURL))
{
List documentsList = clientContext.Web.Lists.GetByTitle(documentListName);
CamlQuery camlQuery = new CamlQuery(); ;
camlQuery.ViewXml =
@"<View>
<Query>
<Where>
<Eq>
<FieldRef Name='" + name + @"'/>
<Value Type='" + type + "'>" + value + @"</Value>
</Eq>
</Where>                    
<RowLimit>" + rowLimit.ToString() + @"</RowLimit>
</Query>
</View>";
listItems = documentsList.GetItems(camlQuery);
clientContext.Load(documentsList);
clientContext.Load(listItems);
clientContext.ExecuteQuery();
}
return listItems;
}
上载一个文档到SharePoint 文档库
　　本例中我们需要上载文档到SharePoint文档库，同时更新该文档的元数据信息。比如通过ClientContext将一个说明字段设置为&#8220;核心内容&#8221;。代码如下：



        public static void UploadDocument(string siteURL, string documentListName,string documentListURL, string documentName, byte[] documentStream)
{
using (ClientContext clientContext = new ClientContext(siteURL))
{
//获取文档库
List documentsList = clientContext.Web.Lists.GetByTitle(documentListName);
var fileCreationInformation = new FileCreationInformation();
//指定内容 byte[]数组，这里是 documentStream
fileCreationInformation.Content = documentStream;
//允许文档覆盖
fileCreationInformation.Overwrite = true;
//上载 URL地址
fileCreationInformation.Url = siteURL + documentListURL + documentName;
Microsoft.SharePoint.Client.File uploadFile = documentsList.RootFolder.Files.Add(fileCreationInformation);
//更新元数据信息，这里是一个显示名为&#8220;描述&#8221;的字段，其字段名为&#8220;Description0&#8221;
uploadFile.ListItemAllFields["Description0"] = "核心内容";
uploadFile.ListItemAllFields.Update();
clientContext.ExecuteQuery();
}
}
从SharePoint文档库下载一个文档
　　我们可以用如下代码下载一个文档



        public static Stream DownloadDocument(string siteURL, string documentName)
{
ListItem item = GetDocumentFromSP(documentName);
if (item != null)
{
using (ClientContext clientContext = new ClientContext(siteURL))
{
FileInformation fInfo = Microsoft.SharePoint.Client.File.OpenBinaryDirect(clientContext, item["FileRef"].ToString());
return fInfo.Stream;
}
}
return null;
}
private static ListItem GetDocumentFromSP(string documentName)
{
//这个方法上面讨论过了，用于从SharePoint文档库获取列表项集合
ListItemCollection listItems = GetListItemCollectionFromSP("FileLeafRef", documentName, "Text", 1);
return (listItems != null && listItems.Count == 1) ? listItems[0] : null;
}


调用示例：



        static string siteURL = "http://sp2010u/it";
static string documentListName = "共享文档";
static void Main(string[] args)
{  
UploadTest();
DownloadTest();
Console.ReadLine();
}
private static void DownloadTest()
{
string downloadDocumentName = "Lesson 2.pptx";
Stream s = DownloadDocument(siteURL, downloadDocumentName);
string saveTo = @"C:\" + downloadDocumentName;
// 创建一个写入流
FileStream writeStream = new FileStream(saveTo, FileMode.Create, FileAccess.Write);
// 写入到该流
ReadWriteStream(s, writeStream);
Console.WriteLine("下载完成！");
}
private static void UploadTest()
{
string uploadDocumentName = "Lesson 1.pptx";
string openFrom =@"C:\"+uploadDocumentName;
if (!System.IO.File.Exists(openFrom))
{
throw new ArgumentException(String.Format("{0} 不存在",openFrom), "openFrom");
}
FileStream fStream = System.IO.File.OpenRead(openFrom);
byte[] contents = new byte[fStream.Length];
fStream.Read(contents, 0, (int)fStream.Length);
//上载到&#8220;共享文档&#8221;文档库下的&#8220;销售计划&#8221;文档集中
UploadDocument(siteURL, documentListName, "/Shared%20Documents/%E9%94%80%E5%94%AE%E8%AE%A1%E5%88%92/", uploadDocumentName, contents);
Console.WriteLine("上载完成！");
fStream.Close();
}
// readStream 是你需要读取的流
// writeStream 是你需要写入的流
private static void ReadWriteStream(Stream readStream, Stream writeStream)
{
int Length = 256;
Byte[] buffer = new Byte[Length];
int bytesRead = readStream.Read(buffer, 0, Length);
// 写入要求的字节
while (bytesRead > 0)
{
writeStream.Write(buffer, 0, bytesRead);
bytesRead = readStream.Read(buffer, 0, Length);
}
readStream.Close();
writeStream.Close();
}

　　
上载到SharePoint中的效果如下：

　　希望对你有帮助！
　　
　　参考资料
　　How to upload/download a document in SharePoint 2010 using Client Context Object Model
　　Microsoft.SharePoint.Client.ListItem Class
　　Microsoft.SharePoint.Client.File Class
　　Programmatically Upload document using Client object model &#8211; SharePoint 2010