Blazor Grid Bound Column by Field Name

Question

I\'m studying some paid grid components and they have a pretty cool \"Bound Column\" technique:

Answer 1

It's not a trivial solution, you should to understand how Blazor works with components. Basically, the way, is to register children MyColumn "templates" on outer MyGrid component, then, render grid dynamically with a bit of reflection. Below I post the recipe ready for copy-paste, test and learn.

Step 0: Create the templated blazor demo:

dotnet new blazorserver

Step 1: Create Pages/MyColumn.razor component:

@code {
    [Parameter]
    public string Field { get; set; }

    [CascadingParameter]
    private MyGrid Parent { get; set; }    

    protected override void OnInitialized()
    {
        base.OnInitialized();        
        Parent.AddColumn(this); //register child into parent
    }
}

Step 2: Create Pages/MyGrid.razor component:

<CascadingValue Value="this">
<table class="table">
    <tbody>
        @ChildContent
        @foreach (var item in DataSource)
        {
            @RowItem(item) 
        }
    </tbody>
</table>
</CascadingValue>

@code {
    [Parameter]
    public RenderFragment ChildContent { get; set; }

    [Parameter]
    public IEnumerable<object> DataSource { get; set; }

    List<MyColumn> Columns = new List<MyColumn>();
    public void AddColumn(MyColumn column)
    {
        Columns.Add(column);
        StateHasChanged();
    }

// Here the function to create each row dynamically:

    private RenderFragment RowItem(object row)
    {   
        int i = 0;
        return b =>          // create dynamically
        {
            b.OpenElement(++i, "tr");
            foreach(var column in Columns)
            {
                b.OpenElement(++i, "td");
                var val = row.GetType().GetProperty(column.Field)
                          .GetValue(row, null).ToString();                
                b.AddContent(++i,val);
                b.CloseElement();
            }
            b.CloseElement();
        };
    }
}

Step 3: Use your grid on Pages/FetchData.razor

@page "/fetchdata"

@using s.Data
@inject WeatherForecastService ForecastService

<h1>Weather forecast</h1>

<p>This component demonstrates fetching data from a service.</p>

@if (forecasts == null)
{
    <p><em>Loading...</em></p>
}
else
{
    <MyGrid DataSource=@forecasts>
       <MyColumn Field="Date"/>
       <MyColumn Field="Summary"/>
    </MyGrid>
}

@code {
    private WeatherForecast[] forecasts;

    protected override async Task OnInitializedAsync()
    {
        forecasts = await ForecastService.GetForecastAsync(DateTime.Now);
    }
}

Result: