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InfiniteAsyncSource.GetUniqueValuesCommand Property

Gets or sets a command that allows you to get unique values.

Namespace: DevExpress.Xpf.Data

Assembly: DevExpress.Xpf.Core.v22.2.dll

NuGet Package: DevExpress.Wpf.Core


public ICommand<GetUniqueValuesAsyncArgs> GetUniqueValuesCommand { get; set; }

Property Value

Type Description

A command that allows you to get unique values.


Bind a command to the GetUniqueValuesCommand property to maintain a clean MVVM pattern. The command works like a InfiniteAsyncSource.GetUniqueValues event handler and allows you to process unique values in a ViewModel.

You can obtain unique values from a data source field to show them in a column’s drop-down filter. To do this, follow the steps below:

  1. Create a GetUniqueValues command.
  2. Use the PropertyName property to get the field name for which the GridControl collects unique values.
  3. Get a list of unique values and assign it to the Result property.
  4. Bind the command to the InfiniteAsyncSource.GetUniqueValuesCommand / PagedAsyncSource.GetUniqueValuesCommand property.
public void GetUniqueValues(GetUniqueValuesAsyncArgs args) {
    if(args.PropertyName == "Priority") {
        var values = Enum.GetValues(typeof(Priority)).Cast<object>().ToArray();
        args.Result = Task.FromResult(values);
    } else {
        throw new InvalidOperationException();

Refer to the following help topic for more information: Enable Filter Operations.

The following code snippets (auto-collected from DevExpress Examples) contain references to the GetUniqueValuesCommand property.


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See Also