C# implements sample code to determine whether a folder exists and create a folder

黄舟
Release: 2017-03-06 11:17:50
Original
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这篇文章主要介绍了C#实现判断文件夹存在与否并创建文件夹的方法,涉及C#针对文件及目录的判断与创建操作相关技巧,需要的朋友可以参考下

本文实例讲述了C#实现判断文件夹存在与否并创建文件夹的方法。分享给大家供大家参考,具体如下:

protected void Button1_Click(object sender, EventArgs e)
{
   if (Directory.Exists(Server.MapPath("~/upimg/hufu")) == false)//如果不存在就创建file文件夹
   {
    Directory.CreateDirectory(Server.MapPath("~/upimg/hufu"));
   }
   //Directory.Delete(Server.MapPath("~/upimg/hufu"), true);//删除文件夹以及文件夹中的子目录,文件
   //判断文件的存在
   if (File.Exists(Server.MapPath("~/upimg/Data.html")))
   {
    Response.Write("Yes");
    //存在文件
   }
   else
   {
    Response.Write("No");
    //不存在文件
    File.Create(MapPath("~/upimg/Data.html"));//创建该文件
   }
   string name = GetFiles.FileName;//获取已上传文件的名字
   string size = GetFiles.PostedFile.ContentLength.ToString();//获取已上传文件的大小
   string type = GetFiles.PostedFile.ContentType;//获取已上传文件的MIME
   string postfix = name.Substring(name.LastIndexOf(".") + 1);//获取已上传文件的后缀
   string ipath = Server.MapPath("upimg") +"\\"+ name;//获取文件的实际路径
   string fpath = Server.MapPath("upfile") + "\\" + name;
   string dpath = "upimg\\" + name;//判断写入数据库的虚拟路径
   ShowPic.Visible = true;//激活
   ShowText.Visible = true;//激活
   //判断文件格式
   if (name == "") {
   Response.Write("<script>alert(&#39;上传文件不能为空&#39;)</script>");
   }
   else{
    if (postfix == "jpg" || postfix == "gif" || postfix == "bmp" || postfix == "png")
    {
     GetFiles.SaveAs(ipath);
     ShowPic.ImageUrl = dpath;
     ShowText.Text = "你上传的图片名称是:" + name + "<br>" + "文件大小:" + size + "KB" + "<br>" + "文件类型:" + type + "<br>" + "存放的实际路径为:" + ipath;
    }
    else
    {
     ShowPic.Visible = false;//隐藏图片
     GetFiles.SaveAs(fpath);//由于不是图片文件,因此转存在upfile这个文件夹
     ShowText.Text = "你上传的文件名称是:" + name + "<br>" + "文件大小:" + size + "KB" + "<br>" + "文件类型:" + type + "<br>" + "存放的实际路径为:" + fpath;
    }
   }
}
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