Question

我正在使用ASP.NET和C＃。

我有一个表单，用户可以在其中将文件上传到服务器。它使用Javascript进行客户端验证检查以确保它是正确的文件类型等。如果它通过了，则将控制传递给aspx.cs代码隐藏文件。上传发生后，我想在同一页面上显示成功通知，或者如果出现任何错误，则显示错误通知。

如何创建可以传递回aspx文件并显示的变量？

upload.aspx

<html>
<%@ Page Language="C#" CodeFile="upload.aspx.cs" Inherits="Upload" %>
...
<head>
<script language="Javascript">
    function validate()
    {
        var filter = /<stuff>/;

        var file1 = document.getElementById("uploadfile1").value;
        var file2 = document.getElementById("uploadfile2").value;
        var file3 = document.getElementById("uploadfile3").value;

        //validation code to make sure uploaded file is legit
        if (success)
        {
            return true;
        }
        else
        {
            alert("File not legit. Please correct.");
            return false;
        }
    }
</script>
</head>

<body>

    //I want to put something here like:
    //<% if success is given, display "Successful Upload" in green %>
    //<% if failure is given, display "Error Uploading" in red %>

    <form method="post" runat="server" action="upload.aspx" name="upload" enctype="multipart/form-data">
        <asp:FileUpload ID="uploadfile1" runat="server" />
        <asp:FileUpload ID="uploadfile2" runat="server" />
        <asp:FileUpload ID="uploadfile3" runat="server" />

        <asp:Button ID="btnUpload" runat="server" Text="Upload" onClientClick="return validate()" onClick="btnUpload_Click" />
    </form>

</body>


</html>

upload.aspx.cs

using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Upload_File : System.Web.UI.Page
{
    protected void btnUpload_Click(object sender, EventArgs e)
    {
        FileUpload[] files = new FileUpload[3];
        files[0] = uploadfile1;
        files[1] = uploadfile2;
        files[2] = uploadfile3;

        string rootpath = "C:\\path\\to\\directory\\";

        for(int i = 0; i < 3; i++)
        {
            if(files[i].HasFile)
            {
                files[i].SaveAs(rootpath + files[i].FileName);

                //I want to put something here like: 
                //var uploadTime = getTimeStamp();
                //var VariableToPass = "Files uploaded at " + uploadTime;
                //also, a way to catch error thrown and set success/error boolean
            }
        }


    }
}

Answer 1

http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.fileupload.saveas%28v=vs.110%29.aspx

此链接包含上传成功消息。

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

如果成功使用UploadStatusLabel.Forecolor = green

如何在回发后显示成功和错误消息？

1 个答案: