Unity operates on Explorer, opens explorer, selects files, and filters files

Open Explorer

Application.OpenURL(path);

Open selection file Filter file types （ as long as type Type of file display ）

 public void Openfile(string type)
    {
    
 
        OpenFileDlg pth = new OpenFileDlg();
        pth.structSize = System.Runtime.InteropServices.Marshal.SizeOf(pth);
 
        pth.filter = " file (*." + type + ")\0*." + type + "";// Filter file types 
        //pth.filter = " Picture file (*.jpg*.png)\0*.jpg;*.png";
        pth.file = new string(new char[256]);
        pth.maxFile = pth.file.Length;
        pth.fileTitle = new string(new char[64]);
        pth.maxFileTitle = pth.fileTitle.Length;
        pth.initialDir = Application.streamingAssetsPath.Replace('/', '\\');  // default path
        pth.title = " Select project json";
        pth.defExt = "JPG";// Show file type 
        pth.flags = 0x00080000 | 0x00001000 | 0x00000800 | 0x00000200 | 0x00000008;
        if (OpenFileDialog.GetOpenFileName(pth))
        {
    
            string filepath = pth.file;// Selected file path ;
 
            DirectoryInfo i = new DirectoryInfo(filepath);
 
            // Superior directory 
            string path = i.Parent.FullName;// Return the parent directory of the file 
 
            ProjectData openprodata = new ProjectData();
            openprodata.proname = Path.GetFileNameWithoutExtension(path);// Return the last folder name of the path 
           }

using System;
using System.Runtime.InteropServices;
 
[ StructLayout( LayoutKind.Sequential, CharSet=CharSet.Auto )]  
 
public class OpenFileDlg
{
    
    public int      structSize = 0;
    public IntPtr   dlgOwner = IntPtr.Zero; 
    public IntPtr   instance = IntPtr.Zero;
    public String   filter = null;
    public String   customFilter = null;
    public int      maxCustFilter = 0;
    public int      filterIndex = 0;
    public String   file = null;
    public int      maxFile = 0;
    public String   fileTitle = null;
    public int      maxFileTitle = 0;
    public String   initialDir = null;
    public String   title = null;   
    public int      flags = 0; 
    public short    fileOffset = 0;
    public short    fileExtension = 0;
    public String   defExt = null; 
    public IntPtr   custData = IntPtr.Zero;  
    public IntPtr   hook = IntPtr.Zero;  
    public String   templateName = null; 
    public IntPtr   reservedPtr = IntPtr.Zero; 
    public int      reservedInt = 0;
    public int      flagsEx = 0;
}
 
public class OpenFileDialog
{
    
	[DllImport("Comdlg32.dll",SetLastError=true,ThrowOnUnmappableChar=true, CharSet = CharSet.Auto)]          
	public static extern bool GetOpenFileName([ In, Out ] OpenFileDlg ofd );
}

original text ：https://blog.csdn.net/qq_38834505/article/details/99826830

Add ：
OpenFileDialog Dialog box Filter Attribute specification ：

Let's start with an example , Look at the Filter The composition of attributes ：“ Excel file |.xls ”, Ahead “Excel file ” Become a label , It's a readable string , You can define ,“|.xls” Is filter , Indicates that the suffix in the filter folder is .xls The file of ,“*” Represents a match Excel String of file name .

OK, Let's talk about several situations we often use ：

1． Filter yes null or Empty, Show all files , And always show folders

2． Need to filter specific files , Set up Filter The attribute is “ label |*. suffix ”, Set according to this format , Tags can be customized , Is a string , Suffixes indicate the file suffixes you need to filter , for example “.txt、.doc” etc.

3． You need to filter a variety of files , For example, you need to filter image files , But there are several suffixes for picture files , for example jpg、png、gif etc. , When you need to filter these files at the same time , Set up Filter The attribute is “ label |.jpg;.png;*.gif”, Be careful ： Just add a few more suffixes to the filter , Use semicolons to separate different suffixes

4． When you need to filter multiple files , But don't list them all at the same time , Only when the user selects the required file type through the drop-down list , Before screening . In this case, you only need to set a few more filters ,filter The properties are set as follows ：“ label 1|*.jpg| label 2|.png| label 3|.gif”. Be careful ： Use between different filters “|” Just separate .

Filter Attributes are similar to regular expressions , The trial * Represents the character that matches the file name , Use “. suffix ” Match the suffix of the file , By connecting suffixes （ The trial ; No. separates the suffixes you need ） It means to filter all files matching the suffix at the same time , adopt “|” Connecting different filters means that the user selects the suffix name to filter files

private void btnupload_Click(object sender, EventArgs e)
        {
    
            using (OpenFileDialog open = new OpenFileDialog())
            {
    
                open.Multiselect = false;
                open.Title = " Open file ";
                open.Filter = " picture |*.jpg;*.png;*.gif;*.jpeg;*.bmp";
                if (open.ShowDialog() == DialogResult.OK)
                {
    
                                   
                }
            }
        }