How to retrieve and update full file property?

Question

Developing uwp app to update property of photo files,
I cannot find a way to update the properties marked red rectangle such as "ISO Speed". I can do it via Windows Explorer. How can I do it in uwp?

Answer 1

Hello,

Welcome to Microsoft Q&A Case.

For retrieving the properties of photo file, you can check the following steps.

1.Create a list of strings and add the identifier for each property you want to retrieve.
2.Call ImageProperties.RetrievePropertiesAsync method, which takes this list of strings and returns a dictionary of key/value pairs.
Reference: Image MetaData

public async void Access()  
        {  
            var folder = KnownFolders.PicturesLibrary;  
            StorageFile imageFile = await folder.GetFileAsync("test1.jpg");  
            if (imageFile!=null)  
            {  
                ImageProperties props = await imageFile.Properties.GetImagePropertiesAsync();            
                var requests = new System.Collections.Generic.List<string>();  
                requests.Add("System.Photo.ISOSpeed");  
IDictionary<string, object> retrievedProps = await props.RetrievePropertiesAsync(requests);  

if (retrievedProps.ContainsKey("System.Photo.ISOSpeed"))  
                {  
                    var exifVersion = retrievedProps["System.Photo.ISOSpeed"];  
}  
}  

For update the properties of photo file, you can use SavePropertiesAsync() method.

ImageProperties props = await imageFile.Properties.GetImagePropertiesAsync();  
var keyvalue = new KeyValuePair<string, object>("System.Photo.ISOSpeed", 100);  
var properties = new List<KeyValuePair<string, object>>() { keyvalue };  
await props.SavePropertiesAsync(properties);  

The sample only shows the retrieval and update of “ISOSpeed” property. If you want to know more properties, please refer to the following document. System.Photo

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