Question

我在我的asp.net网页上有一个方法将csv文件转储到我的gridview中但是我想要包含一个对话框供用户浏览并从他们的PC中选择一个csv文件来导入并获取该文件名和路径信息提供给我的csv导入方法，以便它可以作用于该文件。有一种简单的方法可以做到这一点吗？

Answer 1

您需要此类System.Web.UI.HtmlControls.HtmlInputFile

来自MSDN：

使用HtmlInputFile服务器控件来处理上传二进制文件或从浏览器客户端到服务器的文本文件。文件上传适用于 Microsoft Internet Explorer 3.02或更高版本。

更新：这是来自MSDN（.net v1.1）

的工作代码示例

<%@ Page Language="VB" AutoEventWireup="True" %>

<html>
 <head>

    <script language="VB" runat="server">
       Sub Button1_Click(Source As Object, e As EventArgs)

            If Text1.Value = "" Then
                Span1.InnerHtml = "Error: you must enter a file name"
                Return
            End If

            If Not (File1.PostedFile Is Nothing) Then
                Try
                    File1.PostedFile.SaveAs(("c:\temp\" & Text1.Value))
                    Span1.InnerHtml = "File uploaded successfully to <b>c:\temp\" & _
                                      Text1.Value & "</b> on the Web server"
                Catch exc As Exception
                    Span1.InnerHtml = "Error saving file <b>c:\temp\" & _
                                      Text1.Value & "</b><br>" & exc.ToString()
                End Try
            End If
        End Sub 'Button1_Click 
    </script>

 </head>
 <body>

    <h3>HtmlInputFile Sample</h3>

    <form enctype="multipart/form-data" runat="server">

       Select File to Upload: 
       <input id="File1" 
              type="file" 
              runat="server">

       <p>
       Save as filename (no path): 
       <input id="Text1" 
              type="text" 
              runat="server">

       <p>
       <span id=Span1 
             style="font: 8pt verdana;" 
             runat="server" />

       <p>
       <input type=button 
              id="Button1" 
              value="Upload" 
              OnServerClick="Button1_Click" 
              runat="server">

    </form>

 </body>
 </html>

Answer 2

到目前为止，每个人的回答似乎都是正确的。另一个选择是使用ASP.NET FileUpload control，如果你想坚持服务器端控件。

这是一个如何使用我无耻地从here偷走的控件的示例：

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 

<script runat="server">

  protected void UploadButton_Click(object sender, EventArgs e)
  {
    // Specify the path on the server to
    // save the uploaded file to.
    String savePath = @"c:\temp\uploads\";

    // Before attempting to perform operations
    // on the file, verify that the FileUpload 
    // control contains a file.
    if (FileUpload1.HasFile)
    {
      // Get the name of the file to upload.
      String fileName = FileUpload1.FileName;

      // Append the name of the file to upload to the path.
      savePath += fileName;


      // Call the SaveAs method to save the 
      // uploaded file to the specified path.
      // This example does not perform all
      // the necessary error checking.               
      // If a file with the same name
      // already exists in the specified path,  
      // the uploaded file overwrites it.
      FileUpload1.SaveAs(savePath);

      // Notify the user of the name of the file
      // was saved under.
      UploadStatusLabel.Text = "Your file was saved as " + fileName;
    }
    else
    {      
      // Notify the user that a file was not uploaded.
      UploadStatusLabel.Text = "You did not specify a file to upload.";
    }

  }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>FileUpload Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <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>
    </form>
</body>
</html>

Answer 3

对于 ASP.NET（即 Web 应用程序而不是桌面），将文件上传到 Web 服务器（在这种情况下可能不需要，但原始问题在这一点上不清楚），我建议从 VS 工具箱的 asp:fileupload 控件开始。

asp.net浏览文件

3 个答案: