上传附件删除附件代码,Asp.NET代码库,德仔网

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【Asp.NET】上传附件删除附件
作者: / 发布于2016/1/25/ 491
<tr>
            <td align="right" style="width: 100px" valign="top">
                附件：
            </td>
            <td style="width: 320px" valign="top">
                <asp:FileUpload ID="Uploader" runat="server" />
            </td>
            <td style="width: 100px" valign="top">
                <asp:Button ID="UploadButton" runat="server" Text="添加 >" Width="60px" OnClick="UploadButton_Click" />
                
                <asp:Button ID="DeleteButton" runat="server" Text="< 删除" Width="60px" OnClick="DeleteButton_Click" />
            </td>
            <td>
                <asp:ListBox ID="Attachment" runat="server" Rows="5"></asp:ListBox>
            </td>
</tr>
 
 
 
    /// <summary>
    /// 附件列表（文件名, 文件路径）
    /// </summary>
    private Dictionary<string, string> Attachments
    {
        get
        {
            if (ViewState["Attachments"] == null)
            {
                ViewState["Attachments"] = new Dictionary<string, string>();
            }
            return (Dictionary<string, string>)ViewState["Attachments"];
        }
        set
        {
            ViewState["Attachments"] = value;
        }
    }
   
protected void UploadButton_Click(object sender, EventArgs e)
    {
        if (!Uploader.HasFile)
        {
            MessageBox.Show("请选取有效的附件文件!");
            return;
        }
        //文件夹
        if (!Directory.Exists(Global.UploadPath))
        {
            Directory.CreateDirectory(Global.UploadPath);
        }
        //文件名
        string fileName = Path.GetFileName(Uploader.PostedFile.FileName);
        string fullFileName = Global.UploadPath + "\\" + fileName;
        if (File.Exists(fullFileName))
        {
            File.Delete(fullFileName);
        }
        //保存文件
        try
        {
            Uploader.PostedFile.SaveAs(fullFileName);
        }
        catch (Exception error)
        {
            MessageBox.Show("保存附件文件失败！" + error.Message);
            return;
        }
        //附件列表登记
        if (!Attachments.ContainsKey(fileName))
        {
            Attachments.Add(fileName, fullFileName);
        }
        //刷新
        this.RefreshAttachment();
    }
 
protected void DeleteButton_Click(object sender, EventArgs e)
    {
        if (Attachment.SelectedIndex < 0)
        {
            MessageBox.Show("请选取要删除的附件!");
            return;
        }
        //删除文件
        try
        {
            File.Delete(Attachment.SelectedValue);
        }
        catch
        {
        }
        //删除附件列表登记
        if (Attachments.ContainsKey(Attachment.SelectedItem.Text))
        {
            Attachments.Remove(Attachment.SelectedItem.Text);
        }
        Attachment.ClearSelection();
        //刷新
        this.RefreshAttachment();
    }
 
    /// <summary>
    /// 刷新附件
    /// </summary>
    private void RefreshAttachment()
    {
        Attachment.Items.Clear();
        foreach (string key in Attachments.Keys)
        {
            Attachment.Items.Add(new ListItem(key, Attachments[key]));
        }
    }
 
       StringBuilder attachment = new StringBuilder();
        foreach (ListItem attachmentItem in Attachment.Items)
        {
            attachment.AppendFormat("{0}|", attachmentItem.Value);
        }
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