C# implements the method of judging whether a folder exists or not and creating a folder

This article describes the method of C# to determine whether a folder exists or not and create a folder. Share it for your reference, as follows:

protected void Button1_Click(object sender, EventArgs e)
{
   if ((("~/upimg/hufu")) == false)//Create a file folder if it does not exist   {
    (("~/upimg/hufu"));
   }
   //(("~/upimg/hufu"), true);//Delete folders and subdirectories in folders, files   //Judge the existence of the file   if ((("~/upimg/")))
   {
    ("Yes");
    //The file exists   }
   else
   {
    ("No");
    //The file does not exist    (MapPath("~/upimg/"));//Create this file   }
   string name = ;//Get the name of the uploaded file   string size = ();//Get the size of the uploaded file   string type = ;//Get the MIME of the uploaded file   string postfix = ((".") + 1);//Get the suffix of the uploaded file   string ipath = ("upimg") +"\\"+ name;//Get the actual path to the file   string fpath = ("upfile") + "\\" + name;
   string dpath = "upimg\\" + name;//Judge the virtual path written to the database    = true;//activation    = true;//activation   //Judge file format   if (name == "") {
   ("&lt;script&gt;alert('Uploading files cannot be empty')&lt;/script&gt;");
   }
   else{
    if (postfix == "jpg" || postfix == "gif" || postfix == "bmp" || postfix == "png")
    {
     (ipath);
      = dpath;
      = "The image you uploaded is:" + name + "&lt;br&gt;" + "File Size:" + size + "KB" + "&lt;br&gt;" + "File Type:" + type + "&lt;br&gt;" + "The actual path to storage is:" + ipath;
    }
    else
    {
      = false;//Hide pictures     (fpath);//Since it is not a picture file, it is transferred to the upfile folder      = "The file name you uploaded is:" + name + "&lt;br&gt;" + "File Size:" + size + "KB" + "&lt;br&gt;" + "File Type:" + type + "&lt;br&gt;" + "The actual path to storage is:" + fpath;
    }
   }
}

For more information about C# related content, please check out the topic of this site:Summary of common techniques for C# file operation》、《Summary of C# traversal algorithm and skills》、《Summary of thread usage techniques for C# programming》、《Summary of C# operation skills》、《Summary of XML file operation skills in C#》、《Tutorial on the usage of common C# controls》、《Summary of WinForm control usage》、《C# data structure and algorithm tutorial》、《Summary of C# array operation skills"and"Introduction to C# object-oriented programming tutorial》

I hope this article will be helpful to everyone's C# programming.