DxGridColumn.VisibleChanged Event

Fires when the column visibility changes.

Namespace: DevExpress.Blazor

Assembly: DevExpress.Blazor.v23.2.dll

NuGet Package: DevExpress.Blazor

Declaration

[Parameter]
public EventCallback<bool> VisibleChanged { get; set; }

Parameters

Type	Description
Boolean	A new value of the Visible property.

Remarks

The VisibleChanged event fires each time the Visible property value changes. The event is handled automatically when you use two-way data binding for the Visible property (@bind-Visible).

Razor

@inject WeatherForecastService ForecastService

<DxButton Text="Column Chooser"
          RenderStyle="ButtonRenderStyle.Secondary"
          CssClass="column-chooser-button"
          Click="OnClick" />

<p />   

<DxGrid Data="@Data" @ref="Grid">
    <Columns>
        <DxGridDataColumn FieldName="Date" DisplayFormat="D" />
        <DxGridDataColumn FieldName="TemperatureC" Width="150px" />
        <DxGridDataColumn FieldName="TemperatureF" Width="150px" @bind-Visible=Visible />
        <DxGridDataColumn FieldName="Forecast" />
        <DxGridDataColumn FieldName="CloudCover" />
    </Columns>
</DxGrid>

<p>The TemperartureF column's <b>Visible</b> property value is <b>@Visible</b></p>

@code {
    DxGrid Grid { get; set; }
    bool Visible { get; set; } = false;
    object Data { get; set; }

    protected override void OnInitialized() {
        Data = ForecastService.GetForecast();
    }

    void OnClick() {
        Grid.ShowColumnChooser(".column-chooser-button");
    }
}

WeatherForecast

using System;

public class WeatherForecast {
    public DateTime Date { get; set; }
    public int TemperatureC { get; set; }
    public double TemperatureF => Math.Round((TemperatureC * 1.8 + 32), 2);
    public string Forecast { get; set; }
    public string CloudCover { get; set; }
    public bool Precipitation { get; set; }
}

WeatherForecastService

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Threading;
    using System.Threading.Tasks;

    public class WeatherForecastService {
        private List<WeatherForecast> Forecast { get; set; }

        private static string[] CloudCover = new[] {
            "Sunny", "Partly cloudy", "Cloudy", "Storm"
        };

        Tuple<int, string>[] ConditionsForForecast = new Tuple<int, string>[] {
            Tuple.Create( 22 , "Hot"),
            Tuple.Create( 13 , "Warm"),
            Tuple.Create( 0 , "Cold"),
            Tuple.Create( -10 , "Freezing")
        };

        public WeatherForecastService() {
            Forecast = CreateForecast();
        }

        private List<WeatherForecast> CreateForecast() {
            var rng = new Random();
            DateTime startDate = DateTime.Now;
            return Enumerable.Range(1, 15).Select(index => {
                var temperatureC = rng.Next(-10, 30);
                return new WeatherForecast {
                    Date = startDate.AddDays(index),               
                    TemperatureC = temperatureC,
                    CloudCover = CloudCover[rng.Next(0, 4)],
                    Precipitation = Convert.ToBoolean(rng.Next(0, 2)),
                    Forecast = ConditionsForForecast.First(c => c.Item1 <= temperatureC).Item2
                };
            }).ToList();
        }

        public IEnumerable<WeatherForecast> GetForecast() {
            return Forecast.ToArray();
        }
        // ...
}

Program.cs

// ...
builder.Services.AddSingleton<WeatherForecastService>();