使用FileUpload控件读取已上传的Excel文件，而不将其保存在服务器上

Need to be able to read an Excel file uploaded using FileUploadControl in ASP.NET. The solution will be hosted on a server. I do not want to store the Excel file on the server. I would like to directly convert the excel content into a dataset or a datatable and utilize.

需要能够读取在ASP.NET中使用FileUploadControl上传的Excel文件。解决方案将驻留在服务器上。我不想将Excel文件存储在服务器上。我想直接将excel内容转换为数据集或datatable并加以利用。

Below are the two solutions I already found but would not work for me.

下面是我已经找到但不适合我的两个解决方案。

1. LINQTOEXCEL - This method works when you have an excel file on your local machine and you are running your code on the local machine. In my case, the user is trying to upload an excel file from his local machine using a webpage hosted on a server.

   LINQTOEXCEL—当您在本地机器上有一个excel文件，并且您正在本地机器上运行代码时，此方法将有效。在我的示例中，用户试图使用服务器上的一个页面从本地机器上载excel文件。

2. ExcelDataReader - I am currently using this one, but this is a third party tool. I cannot move this to our customer. Also if a row/column intersection is carrying a formula, then that row/column intersection's data is not being read into the dataset.

   ExcelDataReader -我目前正在使用这个工具，但是这是一个第三方工具。我不能把这个给我们的客户。同样，如果行/列的交集包含一个公式，那么行/列的交集的数据不会被读取到数据集中。

Most of the suggestions i found on google and * work when both the excel and the .NET solution are on the same machine. But in mine, I need it to work when the solution is hosted on a server, and users are trying to upload excel using the hosted webpage on their local machine. If you have any other suggestions, could you please let me know?

我在谷歌和*上找到的大多数建议都适用于excel和。net解决方案都在同一台机器上的情况。但在我的应用中，当解决方案托管在服务器上时，我需要它工作，并且用户正在尝试使用本地机器上的托管页面上载excel。如果你还有什么建议，可以告诉我吗?

4 个解决方案

#1

You can use the InputStream property of the HttpPostedFile to read the file into memory.

可以使用HttpPostedFile的InputStream属性将文件读入内存。

Here's an example which shows how to create a DataTable from the IO.Stream of a HttpPostedFile using EPPlus:

下面的示例展示了如何从IO中创建一个DataTable。使用EPPlus的HttpPostedFile流:

protected void UploadButton_Click(Object sender, EventArgs e)
{
    if (FileUpload1.HasFile && Path.GetExtension(FileUpload1.FileName) == ".xlsx")
    {
        using (var excel = new ExcelPackage(FileUpload1.PostedFile.InputStream))
        {
            var tbl = new DataTable();
            var ws = excel.Workbook.Worksheets.First();
            var hasHeader = true;  // adjust accordingly
            // add DataColumns to DataTable
            foreach (var firstRowCell in ws.Cells[1, 1, 1, ws.Dimension.End.Column])
                tbl.Columns.Add(hasHeader ? firstRowCell.Text
                    : String.Format("Column {0}", firstRowCell.Start.Column));

            // add DataRows to DataTable
            int startRow = hasHeader ? 2 : 1;
            for (int rowNum = startRow; rowNum <= ws.Dimension.End.Row; rowNum++)
            {
                var wsRow = ws.Cells[rowNum, 1, rowNum, ws.Dimension.End.Column];
                DataRow row = tbl.NewRow();
                foreach (var cell in wsRow)
                    row[cell.Start.Column - 1] = cell.Text;
                tbl.Rows.Add(row);
            }
            var msg = String.Format("DataTable successfully created from excel-file. Colum-count:{0} Row-count:{1}",
                                    tbl.Columns.Count, tbl.Rows.Count);
            UploadStatusLabel.Text = msg;
        }
    }
    else 
    {
        UploadStatusLabel.Text = "You did not specify a file to upload.";
    }
}

Here's the VB.NET version:

这是VB。净版:

Sub UploadButton_Click(ByVal sender As Object, ByVal e As System.EventArgs)
    If (FileUpload1.HasFile AndAlso IO.Path.GetExtension(FileUpload1.FileName) = ".xlsx") Then
        Using excel = New ExcelPackage(FileUpload1.PostedFile.InputStream)
            Dim tbl = New DataTable()
            Dim ws = excel.Workbook.Worksheets.First()
            Dim hasHeader = True ' change it if required '
            ' create DataColumns '
            For Each firstRowCell In ws.Cells(1, 1, 1, ws.Dimension.End.Column)
                tbl.Columns.Add(If(hasHeader,
                                   firstRowCell.Text,
                                   String.Format("Column {0}", firstRowCell.Start.Column)))
            Next
            ' add rows to DataTable '
            Dim startRow = If(hasHeader, 2, 1)
            For rowNum = startRow To ws.Dimension.End.Row
                Dim wsRow = ws.Cells(rowNum, 1, rowNum, ws.Dimension.End.Column)
                Dim row = tbl.NewRow()
                For Each cell In wsRow
                    row(cell.Start.Column - 1) = cell.Text
                Next
                tbl.Rows.Add(row)
            Next
            Dim msg = String.Format("DataTable successfully created from excel-file Colum-count:{0} Row-count:{1}",
                                    tbl.Columns.Count, tbl.Rows.Count)
            UploadStatusLabel.Text = msg
        End Using
    Else
        UploadStatusLabel.Text = "You did not specify an excel-file to upload."
    End If
End Sub

For the sake of completeness, here's the aspx:

为了完整起见，这里是aspx:

<div>
   <h4>Select a file to upload:</h4>

   <asp:FileUpload id="FileUpload1"                 
       runat="server">
   </asp:FileUpload>

   <br /><br />

   <asp:Button id="UploadButton" 
       Text="Upload file"
       OnClick="UploadButton_Click"
       runat="server">
   </asp:Button>    

   <hr />

   <asp:Label id="UploadStatusLabel"
       runat="server">
   </asp:Label>        
</div>

#2

//Best Way To read file direct from stream
IExcelDataReader excelReader = null;
//file.InputStream is the file stream stored in memeory by any ways like by upload file control or from database
int excelFlag = 1; //this flag us used for execl file format .xls or .xlsx
if (excelFlag == 1)
{
    //1. Reading from a binary Excel file ('97-2003 format; *.xls)
    excelReader = ExcelReaderFactory.CreateBinaryReader(file.InputStream);
}
else if(excelFlag == 2)                                
{
    //2. Reading from a OpenXml Excel file (2007 format; *.xlsx)
    excelReader = ExcelReaderFactory.CreateOpenXmlReader(file.InputStream);
}

if (excelReader != null)
{
    //...
    //3. DataSet - The result of each spreadsheet will be created in the result.Tables
    ds = excelReader.AsDataSet();
    //...
    ////4. DataSet - Create column names from first row
    //excelReader.IsFirstRowAsColumnNames = true;
    //DataSet result = excelReader.AsDataSet();

    ////5. Data Reader methods
    //while (excelReader.Read())
    //{
    //    //excelReader.GetInt32(0);
    //}

    //6. Free resources (IExcelDataReader is IDisposable)
    excelReader.Close();
}

#3

Maybe you can take a look at Koogra this is an Open Source excel reader (readonly no writer) I think you will get a stream back from the client. Then you can do all your things like you're doing now Read from memorystream and write to Database.

也许你可以看看Koogra，这是一个开源的excel阅读器(readonly no writer)，我想你会从客户那里得到一条消息。然后，您可以像现在这样做，从memorystream读取并写入数据库。

I hope this helps.

我希望这可以帮助。

#4

This is how to do this in MVC using ClosedXML.Excel. I do know this answer is too late. I just wanted to put this answer for all those who land on this page after googling problem. In Visual Studio click on tools menu and expand NuGet Package Manager and then run Package manager console.Type the following command:

这就是如何使用ClosedXML.Excel在MVC中这样做的方法。我知道这个答案已经太迟了。我只是想把这个答案给所有在google上搜索过问题的人。在Visual Studio中，单击tools菜单，展开NuGet包管理器，然后运行包管理器控制台。输入以下命令:

Install-Package ClosedXML

The Model:

模型:

namespace ExcelUploadFileDemo.Models
    {
        public class UploadFile
        {
            [Required]
            public HttpPostedFileBase ExcelFile { get; set; }
        }
    }

The Controller:

控制器:

namespace ExcelUploadFileDemo.Controllers
    {
        public class HomeController : Controller
        {
            public ActionResult Index()
            {
                UploadFile UploadFile = new UploadFile();
                return View(UploadFile);
            }

            [HttpPost]
            public ActionResult Index(UploadFile UploadFile)
            {
                if (ModelState.IsValid)
                {

                    if (UploadFile.ExcelFile.ContentLength > 0)
                    {
                        if (UploadFile.ExcelFile.FileName.EndsWith(".xlsx") || UploadFile.ExcelFile.FileName.EndsWith(".xls"))
                        {
                            XLWorkbook Workbook;
                            Try//incase if the file is corrupt
                            {
                                Workbook = new XLWorkbook(UploadFile.ExcelFile.InputStream);
                            }
                            catch (Exception ex)
                            {
                                ModelState.AddModelError(String.Empty, $"Check your file. {ex.Message}");
                                return View();
                            }
                            IXLWorksheet WorkSheet = null;
                            Try//incase if the sheet you are looking for is not found
                            {
                                WorkSheet = Workbook.Worksheet("sheet1");

                            }
                            catch
                            {
                                ModelState.AddModelError(String.Empty, "sheet1 not found!");
                                return View();
                            }
                            WorkSheet.FirstRow().Delete();//if you want to remove ist row

                            foreach (var row in WorkSheet.RowsUsed())
                            {
                                //do something here
                                row.Cell(1).Value.ToString();//Get ist cell. 1 represent column number

                            }
                        }
                        else
                        {
                            ModelState.AddModelError(String.Empty, "Only .xlsx and .xls files are allowed");
                            return View();
                        }
                    }
                    else
                    {
                        ModelState.AddModelError(String.Empty, "Not a valid file");
                        return View();
                    }
                }
                return View();
            }
        }
    }

This link has many examples showing different ways of handling diverse stuff of excel.

这个链接有许多示例，展示了处理不同的excel数据的不同方法。

https://github.com/ClosedXML/ClosedXML/tree/9ac4d868a313f308b82e94617b9cc2d28baeb1c3/ClosedXML

https://github.com/ClosedXML/ClosedXML/tree/9ac4d868a313f308b82e94617b9cc2d28baeb1c3/ClosedXML

The View

视图

@model ExcelUploadFileDemo.Models.UploadFile


@{
    ViewBag.Title = "Upload Excel File";
}
<h2>Upload an Excel File</h2>

@using (Html.BeginForm(null, null, FormMethod.Post, new { enctype = "multipart/form-data" }))
{



    <div class="form-horizontal">
        @Html.ValidationSummary("", new { @class = "text-danger" });
        <div class="form-group">
            @Html.LabelFor(model => model.ExcelFile, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.TextBoxFor(model => model.ExcelFile, new { type = "file", @class = "form-control" })
                @Html.ValidationMessageFor(model => model.ExcelFile, "", new { @class = "text-danger" })
            </div>
        </div>
        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type = "submit" value="Submit" class="btn btn-default" />
            </div>
        </div>
  </div>
}