C#实现附件上传和下载功能

通常情况下，我们会遇到各种上传附件的情况，以及上传后需要下载，文档格式各种各样，当然这个过程中也是报不同错误，还是一个原则，具体问题，具体分析：需求图：

上传代码实现：
 aspx代码：

<asp:Panel ID="Panel5" runat="server">
<fieldset>
<legend>整体活动效果:</legend>
<nav class="navbar navbar-default" role="navigation">
<table cellspacing="0" class="table table-hover" border="0" style="border-collapse: collapse;">
<tbody>
<tr>
<td><strong>需求单名称</strong></td>
<td colspan="2">
<strong>添加附件</strong>
</td>
<td>附件名称</td>
</tr>
<tr>
<td><asp:Literal ID="LtOrder" runat="server"></asp:Literal></td>
<td>
<asp:Button style="margin-right: -55px;" ID="btnImport" runat="server" Text="添加附件" class="btn btn-default" OnClick="btnImport_Click" /></td>
<td class="Up_file">
<asp:FileUpload ID="UpLoadTxt" runat="server" class="form-control" />
</td>
<td>
<asp:Literal ID="LAccessory" runat="server"></asp:Literal>
</td>
</tr>
</tbody>
</table>
</nav>
</fieldset>
</asp:Panel>

cs代码：  

#region///上传，文件名称添加数据库，文件保存相应路径
/// <summary>
/// 添加附件
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void btnImport_Click(object sender, EventArgs e)
{
string res = "0";
string fileName = UpLoadTxt.FileName;//获取要导入的文件名
if (fileName == null || fileName == "")
{
res = "2";
}
else
{
string savePath = Server.MapPath("~/UploadFiles/ChatLog/");
FileOperatpr(fileName, savePath);
string url = savePath + fileName;
UpLoadTxt.SaveAs(url);
SqlConnection conn = SqlHelperEx.ConnOpen("SPSDB");
string ExtName = getFileExt(fileName).ToUpper();//获取上传文件名称
// string ENDNmae = getFileEND(fileName).ToUpper(); //后缀名
id = Request["id"];
res = GetAccessory(conn, fileName, id);
SqlHelperEx.ConnClose(conn);
}
if (res == "2")
{
Response.Write("<script>alert('没有要添加的文件,请选中文件后再操作!');window.location.href='SNSNeedingOrder_InfoListView.aspx?id=" + Request["id"] + "';</script>");
}
if (res == "0")
{
Response.Write("<script>alert('添加失败!');window.location.href='SNSNeedingOrder_InfoListView.aspx?id=" + Request["id"] + "';</script>");
}
if(res=="1") {
Response.Write("<script>alert('添加成功!');window.location.href='SNSNeedingOrder_InfoListView.aspx?id=" + Request["id"] + "';</script>");
}
if (res == "3")
{
Response.Write("<script>alert('没有需求单，非法操作!');window.location.href='SNSNeedingOrder_InfoListView.aspx?id=" + Request["id"] + "';</script>");
}
}
#region 辅助功能
/// <summary>
/// 获取上传文件的后缀名
/// </summary>
/// <param name="fileName"></param>
/// <returns></returns>
private string getFileEND(string fileName)
{
if (fileName.IndexOf(".") == -1)
return "";
string[] temp = fileName.Split('.');
return temp[temp.Length - 1].ToLower();
}
/// <summary>
/// //获取上传文件的名称
/// </summary>
/// <param name="fileName"></param>
/// <returns></returns>
private string getFileExt(string fileName)
{
if (fileName.IndexOf(".") == -1)
return "";
string file = "";
string[] temp = fileName.Split(new[] { "." }, StringSplitOptions.RemoveEmptyEntries);
file = temp[0].ToLower();
return file.ToLower();
}
private void FileOperatpr(string fileName, string savePath)
{
if (!Directory.Exists(savePath))
{
Directory.CreateDirectory(savePath);
}
if (File.Exists(savePath + fileName))
{
File.Delete(savePath + fileName);
}
}
#endregion
/// <summary>
/// 添加文件名
/// </summary>
/// <param name="conn"></param>
/// <param name="filename"></param>
/// <param name="id"></param>
private string GetAccessory(SqlConnection conn, string filename, string id)
{
string res = "0";
if (id == "0" || id == "" || id == null)
{
res = "3";
}
else
{
if (filename == null || filename == "")
{
res = "2";
}
else
{
string strOrderID = id;
string strFileName = filename;
string strCreateUserId = Session["UserName"].ToString();
StringBuilder strSql = new StringBuilder();
// 生成SQL语句;
strSql.AppendFormat("INSERT INTO BaseSNSAccessory(OrderID,FileName,CreateUserId) values( {0}", Environment.NewLine);
strSql.AppendFormat(" @OrderID,@FileName,@CreateUserId) {0}", Environment.NewLine);
SqlParameter[] parameters = {
new SqlParameter("@OrderID", strOrderID),
new SqlParameter("@FileName", strFileName),
new SqlParameter("@CreateUserId", strCreateUserId),
};
// 执行
int result = SqlHelperEx.ExecuteNonQuery(strSql.ToString(), conn, parameters);
// 返回
SqlHelperEx.ConnClose(conn);
if (result == 1)
{
res = "1";
}
else
{
res = "0";
}
}
}
return res;
}
#endregion

下载实现：

/// <summary>
/// 获取附件
/// </summary>
/// <param name="conn"></param>
/// <param name="id"></param>
public void GetAccessory(SqlConnection conn, string id)
{
string strsql = "SELECT *,(SELECT OrderName FROM Order_Info WHERE IsValid=1 AND id=bs.OrderID AND IsValid=1) AS OrderName FROM BaseSNSAccessory AS bs WHERE bs.IsValid=1 and bs.OrderID="+id+" ORDER BY bs.id DESC";
DataTable dt = SqlHelperEx.GetDataTable(strsql, conn);
if (dt.Rows.Count == 0)
{
Ltlog.Text = "无数据";
return;
}
string fileName = "";
string str = "";
for (int i = 0; i < dt.Rows.Count; i++)
{
fileName = dt.Rows[i]["FileName"].ToString();
str += "<tr height=\"36\" bgcolor=\"#FFFFFF\">";
str += "<td>" + dt.Rows[i]["OrderName"].ToString() + "</td>";
str += "<td> <a href='/EcBossWeb/UploadFiles/ChatLog/" + fileName + "' >点击下载：" + fileName + "</a></td>";
str += " </tr>";
}
LtOrdersory.Text = str.ToString();
//string filePath = "";
//FileStream fs = new FileStream(filePath, FileMode.Open); // 设置文件流,filePath为文件路径
//byte[] bytes = new byte[(int)fs.Length];
//fs.Read(bytes, 0, bytes.Length); // 读取
//fs.Close();
//Response.ClearContent(); // 清楚缓冲区所有内容
//Response.ClearHeaders(); // 清楚缓冲区所有头
//Response.ContentType = "application/octet-stream"; // 设置输出流的Http MIME类型
////通知浏览器下载文件而不是打开
//Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8)); //fileName为需要下载的文件名
//Response.BinaryWrite(bytes); // 写入输入流
//Response.Flush(); // 向客户端发送数据流
//Response.End();
}

以上就是为大家分享的C#实现附件上传和下载功能的关键代码，希望对大家的学习有所帮助。

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