在本文中，您將學習如何在ASP.NET MVC 應用程序中創(chuàng)建、讀取和編輯 Excel 電子表格。為此，我們將創(chuàng)建一個由功能豐富的網(wǎng)格控件組成的電子表格應用程序，用于顯示和編輯 Excel 文件，如下所示：

為了在 ASP.NET MVC 中創(chuàng)建電子表格應用程序，我們將使用Aspose.Cells.GridJs。API 允許您創(chuàng)建基于 Web 的應用程序以快速輕松地顯示或編輯電子表格文檔。此外，您可以導入流行的電子表格（XLS、XLSX、XLSM、XLSB、CSV、SpreadsheetML、ODS）文件格式（閱讀更多）。此外，它還提供了強大而豐富的公式計算引擎，不僅可以計算內置函數(shù)，還可以計算自定義公式。

創(chuàng)建 ASP.NET MVC 電子表格應用程序的步驟

以下是在 ASP.NET MVC 中創(chuàng)建基于 Web 的電子表格應用程序的步驟。

1、在 Visual Studio 中創(chuàng)建一個新的ASP.NET Core Web 應用程序（模型-視圖-控制器）。

2、從 NuGet安裝Aspose.Cells.GridJs。

3、將以下代碼插入到HomeController.cs 中。

public class HomeController : Controller
    {
        public IActionResult Index()
        {
            return RedirectToRoute("default",
          new { controller = "GridJs2", action = "List" });
        }

        public IActionResult Privacy()
        {
            return Redirect("http://about.aspose.app/legal/privacy-policy");
        }

        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
        public IActionResult Error()
        {
            return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
        }
    }

4、在Models文件夾中新建一個名為TestConfig.cs 的類，并添加以下代碼（根據(jù)您的環(huán)境更改文件夾路徑）。

public class TestConfig
{
    ////// the directory which contains workbook files
    ///internal static String ListDir = @"D:\tmpdel\storage\wb";
    ////// temp directory to store files
    ///internal static String TempDir = @"D:\tmpdel\storage\wb\tmp\";
}

5、在Models文件夾中創(chuàng)建一個名為LocalFileCache.cs的新類并添加以下代碼。

/* Add the following namespaces as well.
using Aspose.Cells.GridJs;
using System.IO;
*/

public class LocalFileCache : GridCacheForStream
{

    ////// Implement this method to savecache,save the stream to the cache object with the key id.
    //////the source stream///he key id.public override void SaveStream(Stream s, String uid)
    {
        String filepath = Path.Combine(Config.FileCacheDirectory + Path.DirectorySeparatorChar + "streamcache", uid.Replace('/', '.'));
        using (FileStream fs = new FileStream(filepath, FileMode.Create))
        {
            s.Position = 0;
            s.CopyTo(fs);
        }

    }

    ////// Implement this method to loadcache with the key uid,return the stream from the cache object.
    //////the key id///the stream from  the cachepublic override Stream LoadStream(String uid)
    {
        String filepath = Path.Combine(Config.FileCacheDirectory + Path.DirectorySeparatorChar + "streamcache", uid.Replace('/', '.'));
        FileStream fs = new FileStream(filepath, FileMode.Open);
        return fs;
    }
    //////  implement the url in action controller  to get the file
    //////the key id///public override String GetFileUrl(string uid)
    {
        return "/GridJs2/GetFile?id=" + uid;
    }

}

6、創(chuàng)建一個名為GridJs2Controller.cs的新控制器并添加以下代碼。

/* Add the following namespaces as well.
System.IO;
System.Collections;
System.Threading;
Microsoft.AspNetCore.StaticFiles;
Aspose.Cells.GridJs;
*/


[Route("[controller]/[action]")]
[ApiController]
public class GridJs2Controller : Controller
{

    public ActionResult List()
    {
        //this.ViewBag.list = new List();
        ArrayList dirlistsss = new ArrayList();
        ArrayList filelistsss = new ArrayList();

        DirectoryInfo dir = new DirectoryInfo(TestConfig.ListDir);

        //find files under the directory
        FileInfo[] fi = dir.GetFiles();
        foreach (FileInfo f in fi)
        {
            String fname = f.FullName.ToString();
            dirlistsss.Add(fname);
            filelistsss.Add(Path.GetFileName(fname));
        }
        //  ViewData.
        ViewBag.dirlist = dirlistsss;
        ViewBag.filelist = filelistsss;
        return View("~/Views/Home/list.cshtml");
    }

    // GET: /GridJs2/DetailJson?filename=
    public ActionResult DetailFileJson(string filename)
    {


        String file = Path.Combine(TestConfig.ListDir, filename);

        return DetailJson(file);
    }



    private ActionResult DetailJson(string path)
    {
        GridJsWorkbook wbj = new GridJsWorkbook();


        try
        {
            GridInterruptMonitor m = new GridInterruptMonitor();
            wbj.SetInterruptMonitorForLoad(m, 50 * 1000);
            Thread t1 = new Thread(new ParameterizedThreadStart(InterruptMonitor));
            t1.Start(new object[] { m, 90 * 1000 });




            using (FileStream fs = new FileStream(path, FileMode.Open))
            {
                wbj.ImportExcelFile(fs, GridJsWorkbook.GetGridLoadFormat(Path.GetExtension(path)));
            }

        }
        catch (Exception ex)
        {

            if (ex is GridCellException)
            {
                return Content(wbj.ErrorJson(((GridCellException)ex).Message + ((GridCellException)ex).Code), "text/plain", System.Text.Encoding.UTF8);
            }
            return Content(wbj.ErrorJson(ex.Message), "text/plain", System.Text.Encoding.UTF8);
        }
        //return File(stream, "application/octet-stream", "streamfile");
        return Content(wbj.ExportToJson(), "text/plain", System.Text.Encoding.UTF8);
    }
    private static void InterruptMonitor(object o)
    {
        object[] os = (object[])o;
        try
        {
            Thread.Sleep((int)os[1]);

            ((GridInterruptMonitor)os[0]).Interrupt();
        }
        catch (ThreadInterruptedException e)
        {
            Console.WriteLine("Succeeded for load in give time.");
        }
    }
    [HttpPost]
    // post: /GridJs2/UpdateCell
    public ActionResult UpdateCell()
    {

        string p = HttpContext.Request.Form["p"];
        string uid = HttpContext.Request.Form["uid"];
        GridJsWorkbook gwb = new GridJsWorkbook();
        String ret = gwb.UpdateCell(p, uid);

        return Content(ret, "text/plain", System.Text.Encoding.UTF8);
    }


    // GET: /GridJs2/Xspreadtml
    public ActionResult Xspreadtml(String filename)
    {
        return Redirect("~/xspread/index.html?file=" + filename);
    }

    // GET: /GridJs2/Image?uid=&id=

    public FileResult Image()
    {

        string fileid = HttpContext.Request.Query["id"];
        string uid = HttpContext.Request.Query["uid"];

        return new FileStreamResult(GridJsWorkbook.GetImageStream(uid, fileid), "image/png");
    }

    //if use GridCacheForStream you need to set this api
    // GET: /GridJs2/ImageUrl?uid=&id=
    public JsonResult ImageUrl(string id, string uid)
    {


        return new JsonResult(GridJsWorkbook.GetImageUrl(uid, id, "."));

    }
    private string GetMimeType(string FileName)
    {
        string contentType;
        new FileExtensionContentTypeProvider().TryGetContentType(FileName, out contentType);
        return contentType ?? "application/octet-stream";
    }




    // GET: /GridJs2/GetFile?id

    public FileResult GetFile(string id)
    {

        string fileid = id;
        string mimeType = GetMimeType(fileid);

        return File(GridJsWorkbook.CacheImp.LoadStream(fileid), mimeType, fileid.Replace('/', '.'));
    }


    ////// down load file
    //////[HttpPost]

    public JsonResult Download()
    {

        string p = HttpContext.Request.Form["p"];
        string uid = HttpContext.Request.Form["uid"];
        string filename = "123.xlsx";

        GridJsWorkbook wb = new GridJsWorkbook();
        wb.MergeExcelFileFromJson(uid, p);



        GridInterruptMonitor m = new GridInterruptMonitor();
        wb.SetInterruptMonitorForSave(m);
        Thread t1 = new Thread(new ParameterizedThreadStart(InterruptMonitor));
        t1.Start(new object[] { m, 30 * 1000 });
        try
        {
            wb.SaveToCacheWithFileName(uid, filename, null);
        }
        catch (Exception ex)
        {

            if (ex is GridCellException)
            {
                return Json(((GridCellException)ex).Message + ((GridCellException)ex).Code);
            }
        }
        if (filename.EndsWith(".html"))
        {
            filename += ".zip";
        }
        String fileurl = GridJsWorkbook.CacheImp.GetFileUrl(uid + "/" + filename);
        return new JsonResult(fileurl);
    }


}

7、在Startup.cs的Configure函數(shù)中插入如下代碼，設置License文件的路徑。

/* Add the following namespace as well.
using Aspose.Cells.GridJs;
*/

License l = new License();
LocalFileCache mwc = new LocalFileCache();
GridJsWorkbook.CacheImp = mwc;
l.SetLicense(@"D:\licenses\Conholdate.Total.Product.Family.lic");

8、在Views/Home/index.cshtml 中插入以下代碼。

@{
    ViewData["Title"] = "Home Page";
}

9、在Views/Home/文件夾下新建一個名為list.cshtml 的視圖，并插入以下代碼。

<div id="body" style="  width: 800px; height: 800px; border: 1px solid; overflow-y: scroll; SCROLLBAR-BASE-COLOR: #8ccc8c;">
    @foreach (var item in ViewBag.filelist)
    {
        <a href="Xspreadtml?filename=@item" target="_blank"><em> @item   </em>  </a> <br />
    }
</div>

10、從GitHub下載xspread文件夾，放到wwwroot文件夾下，如下圖。

11、確保wwwroot/xspread/index.html中指定的端口號與項目的端口號相同。

12、構建應用程序并在您喜歡的瀏覽器中運行它。

以下是我們剛剛創(chuàng)建的 ASP.NET MVC 電子表格應用程序的演示。

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