26 lines
870 B
Markdown
26 lines
870 B
Markdown
# MgGrid — Master-Detail
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> Part of the MgGrid system. See `README.md` for overview and component hierarchy.
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## How It Works
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1. `MgGridBase.BuildRenderTree` wraps content in `CascadingValue<IMgGridBase>`
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2. Child grids receive this via `[CascadingParameter] IMgGridBase? ParentGrid`
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3. `IsMasterGrid` = `ParentDataItem == null`
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4. `GetRootGrid()` walks the `ParentGrid` chain to find the topmost grid
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## Detail Grid Setup
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```razor
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<DetailRowTemplate>
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@{
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var parent = (ParentEntity)context.DataItem;
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<GridChildEntity ParentDataItem="@parent"
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KeyFieldNameToParentId="ParentEntityId"
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ContextIds="@(new object[] { parent.Id })" />
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}
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</DetailRowTemplate>
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```
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When `ParentDataItem` is set and `KeyFieldNameToParentId` is provided, new items automatically get their parent FK set via reflection.
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