AyCode.Blazor/AyCode.Blazor.Components/docs/MGGRID/MGGRID_DETAIL.md

MgGrid — Master-Detail

Part of the MgGrid system. See README.md for overview and component hierarchy.

How It Works

1. MgGridBase.BuildRenderTree wraps content in CascadingValue<IMgGridBase>
2. Child grids receive this via [CascadingParameter] IMgGridBase? ParentGrid
3. IsMasterGrid = ParentDataItem == null
4. GetRootGrid() walks the ParentGrid chain to find the topmost grid

Detail Grid Setup

<DetailRowTemplate>
    @{
        var parent = (ParentEntity)context.DataItem;
        <GridChildEntity ParentDataItem="@parent"
                         KeyFieldNameToParentId="ParentEntityId"
                         ContextIds="@(new object[] { parent.Id })" />
    }
</DetailRowTemplate>

When ParentDataItem is set and KeyFieldNameToParentId is provided, new items automatically get their parent FK set via reflection.