BasicProperties Class
Definition
Important
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Provides access to the basic properties, like the size of the item or the date the item was last modified, of the item (like a file or folder).
public ref class BasicProperties sealed : IStorageItemExtraProperties
/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
class BasicProperties final : IStorageItemExtraProperties
[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
public sealed class BasicProperties : IStorageItemExtraProperties
Public NotInheritable Class BasicProperties
Implements IStorageItemExtraProperties
- Inheritance
- Attributes
- Implements
Windows requirements
Device family |
Windows 10 (introduced in 10.0.10240.0)
|
API contract |
Windows.Foundation.UniversalApiContract (introduced in v1.0)
|
Examples
The File access sample demonstrates how to retrieve properties of a file, including basic properties like Size and DateModified.
try
{
StorageFile file = rootPage.sampleFile;
if (file != null)
{
StringBuilder outputText = new StringBuilder();
// Get basic properties
BasicProperties basicProperties = await file.GetBasicPropertiesAsync();
outputText.AppendLine("File size: " + basicProperties.Size + " bytes");
outputText.AppendLine("Date modified: " + basicProperties.DateModified);
// Specify more properties to retrieve
readonly string dateAccessedProperty = "System.DateAccessed";
readonly string fileOwnerProperty = "System.FileOwner";
List<string> propertiesName = new List<string>();
propertiesName.Add(dateAccessedProperty);
propertiesName.Add(fileOwnerProperty);
// Get the specified properties through StorageFile.Properties
IDictionary<string, object> extraProperties = await file.Properties.RetrievePropertiesAsync(propertiesName);
var propValue = extraProperties[dateAccessedProperty];
if (propValue != null)
{
outputText.AppendLine("Date accessed: " + propValue);
}
propValue = extraProperties[fileOwnerProperty];
if (propValue != null)
{
outputText.AppendLine("File owner: " + propValue);
}
}
}
// Handle errors with catch blocks
catch (FileNotFoundException)
{
// For example, handle a file not found error
}
After GetBasicPropertiesAsync completes, basicProperties
gets a BasicProperties object.
In the example, file
contains a StorageFile that represents the file to retrieve properties for.
Remarks
You can access a BasicProperties object asynchronously using the GetBasicPropertiesAsync method of an item (like a file of folder), or synchronously using the BasicProperties property if it is available.
You can get a BasicProperties object using any of the following methods and properties:
- storageFile.getBasicPropertiesAsync method
- storageFolder.getBasicPropertiesAsync method
- FileInformation.basicProperties property
- FolderInformation.basicProperties property
Properties
DateModified |
Gets the timestamp of the last time the file was modified. |
ItemDate |
Gets the most relevant date for the item. |
Size |
Gets the size of the file in bytes. |
Methods
RetrievePropertiesAsync(IIterable<String>) |
Retrieves the specified properties associated with the item. |
SavePropertiesAsync() |
Saves all properties associated with the item. |
SavePropertiesAsync(IIterable<KeyValuePair<String,Object>>) |
Saves the specified properties and values associated with the item. |
Applies to
See also
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