DxGridColumn.Visible Property

@inject WeatherForecastService ForecastService

<DxGrid Data="@Data">
    <Columns>
        <DxGridDataColumn FieldName="Date" DisplayFormat="D" />
        <DxGridDataColumn FieldName="TemperatureC" />
        <DxGridDataColumn FieldName="TemperatureF" Visible="false" />
        <DxGridDataColumn FieldName="Forecast" />
        <DxGridDataColumn FieldName="CloudCover" />
    </Columns>
</DxGrid>

@code {
    object Data { get; set; }

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

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; }
}

    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();
        }
        // ...
}

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

@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");
    }
}

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; }
}

    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();
        }
        // ...
}

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

<DxLayoutBreakpoint DeviceSize="DeviceSize.XSmall" @bind-IsActive="@isXSmallScreen" />

<div class="h-100 grid-wrapper">
    @inject NwindDataService NwindDataService

    @if (isXSmallScreen) {
        <div class="fab-container">
            <DxButton RenderStyle="ButtonRenderStyle.Primary"
                IconCssClass="btn-column-chooser"
                CssClass="fab"
                Click="@ShowColumnChooser" />
        </div>
    } else {
        <div class="align-self-start p-2">
            <DxButton Text="Column Chooser"
                RenderStyle="ButtonRenderStyle.Secondary"
                IconCssClass="btn-column-chooser"
                Click="@ShowColumnChooser" />
        </div>
    }
    <DxGrid @ref="@Grid" CssClass="flexGrid" Data="@Data" VirtualScrollingEnabled="true">
            <Columns>
                <DxGridDataColumn FieldName="ContactName" MinWidth="80" />
                <DxGridDataColumn FieldName="ContactTitle" MinWidth="100" Visible="@GetExtraColumnsVisible()" />
                <DxGridDataColumn FieldName="CompanyName" MinWidth="100" />
                <DxGridDataColumn FieldName="City" Width="15%" MinWidth="80" Visible="@GetExtraColumnsVisible()" />
                <DxGridDataColumn FieldName="Country" Width="10%" MinWidth="80" />
            </Columns>
    </DxGrid>
    @* ... *@
@code {
    bool isXSmallScreen;
    IGrid Grid { get; set; }
    IEnumerable<Supplier> Data { get; set; }

    protected override async Task OnInitializedAsync() {
        Data = await NwindDataService.GetSuppliersAsync();
    }

    void ShowColumnChooser() {
        Grid.ShowColumnChooser(new DialogDisplayOptions($".flexGrid", HorizontalAlignment.Center, VerticalAlignment.Center));
    }
    bool GetExtraColumnsVisible() { return !isXSmallScreen; }
}

.grid-wrapper {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.btn-column-chooser {
    width: 16px;
    height: 16px;
    -webkit-mask-image: url("images/icons/column-chooser.svg");
    mask-image: url("images/icons/column-chooser.svg");
    background-color: currentColor;
}

.fab-container {
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: center;
    user-select: none;
    position: absolute;
    bottom: 16px;
    right: 16px;
}

.fab {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    position: relative;
    z-index: 1;
    box-shadow: 0 0.5rem 1rem rgba(0,0,0,.35) !important;
}

.flexGrid {
    flex: 1 1 auto;
    overflow-y: auto;
}