我在我的 asp.net 网页中有一个方法可以将 csv 文件转储到我的 gridview 中，但我想包含一个对话框供用户浏览并从他们的 PC 中选择一个 csv 文件以导入并获取该文件名和输入我的 csv 导入方法的路径信息，以便它可以对文件进行操作。有没有简单的方法可以做到这一点？
【问题讨论】：
标签： asp.net vb.net openfiledialog
你需要这个类 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>
【讨论】：
到目前为止，这里的每个人的答案似乎都是正确的。如果您想坚持使用服务器端控件，另一种选择是使用 ASP.NET FileUpload control。
下面是我无耻从here偷来的控件的使用示例：
<%@ 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>
【讨论】：
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，但最初的问题在这一点上并不清楚），我建议从 VS 工具箱的 asp:fileupload 控件开始。
【讨论】：