File selector, file recorder, and folder selector of Windows Store app

During application development, you often need to open and save files. In Windows 8, the windows. Storage. pickers namespace provides a class for opening and saving files:

Class	Description
Fileextensionvector	Indicates the random access set of the file extension.
Fileopenpicker	Specifies the selector that allows you to select and open the UI element of a file.
Filepickerfiletypesorderedmap	Indicates a set of display names mapped to the associated file type (Extension.
Filepickerselectedfilesarray	Indicates the set of stored files selected by the user using the file selector.
Filesavepicker	Indicates the selector that allows users to select file names, extensions, and storage locations for files.
Folderpicker	Specifies the selector that allows you to select the UI element of a folder.

To use the File selector and file saver, you must add the selector declaration to the application. Double-click package. appxmanifest, select the "Declaration" tab, and add the file selector and file saver.

I.Fileopenpicker (File selector)

Attribute	Description
Commitbuttontext	Obtains or sets the label text of the submit button of the file open selector.
Filetypefilter	Obtains the set of document types displayed by the file open selector.
Settingsidentifier	Gets or sets the Set Identifier associated with the state of the file open selector.
Suggestedstartlocation	Obtain or set the initial position of the file to be presented to the user by the file open selector.
Viewmode	Obtains or sets the file opening selector to display the view mode of the project.

 

Method	Description
Pickmultiplefilesasync	Displays the file selector so that you can select multiple files.
Picksinglefileasync	The file selector is displayed so that you can select a file.

 

1 /// <summary> 2 /// select a single file 3 /// </Summary> 4 /// <Param name = "sender"> </param> 5/ // <Param name = "E"> </param> 6 async private void btnopenfile_click (Object sender, routedeventargs e) 7 {8 fileopenpicker filepicker = new fileopenpicker (); 9 filepicker. commitbuttontext = "OK"; 10 filepicker. filetypefilter. add (". TXT "); 11 filepicker. suggestedstartlocation = pickerlocationid. documentslibrary; 12 filep Icker. viewmode = pickerviewmode. thumbnail; 13 storagefile = await filepicker. picksinglefileasync (); 14 if (storagefile! = NULL) 15 {16 string filecontent = await fileio. readtextasync (storagefile); 17 tbkcontent. TEXT = filecontent; 18} 19} 20 21 /// <summary> 22 /// select multiple files 23 /// </Summary> 24 /// <Param name = "sender"> </param> 25 // <Param name = "E"> </param> 26 async private void btnmultiopenfile_click (Object sender, routedeventargs e) 27 {28 fileopenpicker filepicker = new fileopenpicker (); 29 filepicker. commitbuttontext = "true Set "; 30 filepicker. filetypefilter. add (". TXT "); 31 filepicker. suggestedstartlocation = pickerlocationid. documentslibrary; 32 filepicker. viewmode = pickerviewmode. thumbnail; 33 ireadonlylist <storagefile> storagefilelist = await filepicker. pickmultiplefilesasync (); 34 if (storagefilelist! = NULL) 35 {36 foreach (storagefile file in storagefilelist) 37 {38 // todo: Continue File Operations 39} 40 41} 42}

 

II.Filesavepicker)

 

Attribute	Description
Commitbuttontext	Obtain or set the label text of the submit button in the pickerui file.
Defaultfileextension	Gets or sets the default file extension of the file saved through filesavepicker.
Filetypechoices	Obtains a set of valid file types that can be allocated to a file.
Settingsidentifier	Gets or sets the identifier associated with the current filesavepicker instance.
Suggestedfilename	Obtains or sets the recommended file name from the file storage selector.
Suggestedsavefile	Obtains or sets the storagefile recommended by the file selector for saving files.
Suggestedstartlocation	Obtains or sets the recommended location from the file storage selector as the location of the file to be saved.

 

Method	Description
Picksavefileasync	Displays the file selector so that you can save the file and set the file name, extension, and location of the file to be saved.

 

1 /// <summary> 2 /// file storage device 3 /// </Summary> 4 /// <Param name = "sender"> </param> 5/ // <Param name = "E"> </param> 6 async private void btnsavefile_click (Object sender, routedeventargs e) 7 {8 filesavepicker filepicker = new filesavepicker (); 9 filepicker. commitbuttontext = "save"; 10 filepicker. suggestedstartlocation = pickerlocationid. documentslibrary; 11 filepicker. defaultfileextension = ". TXT "; 12 filepicker. filetypechoices. add ("TXT", new list <string> (){". TXT "}); 13 filepicker. suggestedfilename = datetime. now. tostring ("yyyymmddhhmmss "). tostring (); 14 storagefile = await filepicker. picksavefileasync (); 15 await fileio. writetextasync (storagefile, "Test Data", unicodeencoding. utf8); 16}

 

3. folderpicker)

Attribute	Description
Commitbuttontext	Obtains or sets the label text of the submit button of the folder selector.
Filetypefilter	Obtains the set of document types displayed by the folder selector.
Settingsidentifier	Gets or sets the identifier associated with the current folderpicker instance.
Suggestedstartlocation	Obtain or set the folder selector to find the initial location of the folder to be presented to the user.
Viewmode	Gets or sets the folder selector to display the view mode of the project.

 

Method	Description
Picksinglefolderasync	Show the folderpicker object so that you can select a folder.

 

1 /// <summary> 2 /// folder selector 3 /// </Summary> 4 /// <Param name = "sender"> </param> 5 // /<Param name = "E"> </param> 6 async private void btnselectfolder_click (Object sender, routedeventargs e) 7 {8 folderpicker = new folderpicker (); 9 folderpicker. commitbuttontext = "select"; 10 folderpicker. filetypefilter. add (". TXT "); 11 folderpicker. filetypefilter. add (". jpg "); 12 folderpicker. filetypefilter. add (". PNG "); 13 folderpicker. filetypefilter. add (". doc "); 14 folderpicker. suggestedstartlocation = pickerlocationid. documentslibrary; 15 folderpicker. viewmode = pickerviewmode. thumbnail; 16 storagefolder = await folderpicker. picksinglefolderasync (); 17 // Add the folder 18 storagefolder newfolder = await storagefolder Under the selected folder. createfolderasync ("new folder", creationcollisionoption. generateuniquename); 19}

 

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