添加引用

using Microsoft.SharePoint.Client;
using OfficeDevPnP.Core;

拉取文件

dic 为文件名称和文件地址映射 map

AuthenticationManager authMan = new AuthenticationManager();
ClientContext ctx = authMan.GetWebLoginClientContext(siteUrl);

ctx.Load(ctx.Web, c => c.Title);
ctx.ExecuteQuery();
Console.WriteLine(ctx.Web.Title);

foreach (var item in dic)
{
    File file = ctx.Web.GetFileByUrl(item.Value);
    ctx.Load(file);
    ctx.ExecuteQuery();
    string filepath = @"C:\temp\excel\storagedata\" + file.Name;
    Microsoft.SharePoint.Client.ClientResult<System.IO.Stream> mstream = file.OpenBinaryStream();
    ctx.ExecuteQuery();

    using (var fileStream = new System.IO.FileStream(filepath, System.IO.FileMode.Create))
    {
        mstream.Value.CopyTo(fileStream);
    }
}