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  • C# 上传下载文件

    代码
    protected void btnFileUpload_Click(object sender, EventArgs e)
    {
    int fileSize = FileUpload1.PostedFile.ContentLength;
    //string fileName = FileUpload1.PostedFile.FileName; //全路径
    string fileName = Path.GetFileName(FileUpload1.PostedFile.FileName);
    if (fileName != "")
    {
    //True不存在同名文件
    bool flag = IsExistSameFile(Server.MapPath("..\\FilesPublic"), fileName);
    if (flag)
    {
    FileUpload1.PostedFile.SaveAs(Server.MapPath(
    "..\\FilesPublic\\") + fileName);

    }

    }

    }

    //文件夹中是否存在同名文件

    public bool IsExistSameFile(string filePath, string fileName)
    {
    bool flag
    = true;
    FileInfo[] NewFileInfo;
    //定义一个数组,储存找到的文件并作为返回值
    DirectoryInfo FatherDirectory = new DirectoryInfo(filePath); //创建一个当前目录的实例
    NewFileInfo = FatherDirectory.GetFiles();
    //遍历文件夹
    foreach (FileInfo NextFolder in NewFileInfo)
    {
    if (fileName == NextFolder.Name)
    {
    flag
    = false;
    }
    }
    return flag;
    }



    //下载文件,弹出另存为对话框

    protected
    void lbDownLoad_Click(object sender, EventArgs e)
    {
    LinkButton lb
    = (LinkButton)sender;
    string id
    = lb.CommandArgument;
    DataSet ds
    = WFInfo.Business.FileManager.FileNameByID(id);
    string fileName
    = ds.Tables[0].Rows[0]["FileName"].ToString();

    string filepath
    = Server.MapPath("../FilesPublic/" + fileName);
    string filename
    = System.IO.Path.GetFileName(filepath);
    Response.Clear();
    Response.ContentType
    = "application/octet-stream";
    Response.AppendHeader(
    "Content-Disposition", "attachment;filename=" + filename);
    Response.TransmitFile(filepath);
    Response.Flush();
    Response.Close();
    }
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  • 原文地址:https://www.cnblogs.com/paste/p/1864677.html
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